apply stignore synchronization patch

It's only polite, and it enables better troubleshooting in situations
like weird-ass requests to the upgrades download service.

---------

Signed-off-by: Jakob Borg <jakob@kastelo.net>

.gitea/workflows/custom-release.yml

@@ -0,0 +1,142 @@
+name: custom release
+
+permissions:
+  contents: write
+  releases: write
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - ".gitea/workflows/custom-release.yml"
+      - "patches/**"
+      - "scripts/update-custom-release.sh"
+      - "scripts/sync-upstream.sh"
+  workflow_dispatch:
+    inputs:
+      upstream_tag:
+        description: "Optional upstream Syncthing tag, for example v2.1.0"
+        required: false
+      suffix:
+        description: "Optional custom release suffix, for example stignore.7"
+        required: false
+  schedule:
+    - cron: "17 04 * * *"
+
+jobs:
+  build-custom-release:
+    runs-on: ffmini_macos_arm64
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+          cache: false
+
+      - name: Configure Git author
+        run: |
+          git config user.name "Gitea Actions"
+          git config user.email "actions@git.felixfoertsch.de"
+
+      - name: Mirror upstream and rebuild patched main
+        run: ./scripts/sync-upstream.sh
+        env:
+          SYNC_REMOTE: origin
+
+      - name: Set up tea
+        run: |
+          go install code.gitea.io/tea@v0.14.1
+          echo "$(go env GOPATH)/bin" >> "$GITHUB_PATH"
+          "$(go env GOPATH)/bin/tea" logins delete actions >/dev/null 2>&1 || true
+          "$(go env GOPATH)/bin/tea" logins add --name actions --url https://git.felixfoertsch.de --token "$GITEA_TOKEN" --no-version-check
+        env:
+          GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}
+
+      - name: Import Developer ID certificate
+        run: |
+          set -euo pipefail
+          keychain_dir="$HOME/Library/Keychains"
+          mkdir -p "$keychain_dir"
+          keychain_path="$keychain_dir/syncthing-release-signing-${GITHUB_RUN_ID:-$$}.keychain-db"
+          keychain_password="$(openssl rand -hex 24)"
+          certificate_path="$RUNNER_TEMP/developer-id-application.p12"
+          previous_default_keychain="$(security default-keychain -d user 2>/dev/null | sed 's/[ "]//g' || true)"
+
+          echo "CUSTOM_RELEASE_KEYCHAIN_PATH=$keychain_path" >> "$GITHUB_ENV"
+          echo "CUSTOM_RELEASE_KEYCHAIN_PASSWORD=$keychain_password" >> "$GITHUB_ENV"
+          echo "CUSTOM_RELEASE_PREVIOUS_DEFAULT_KEYCHAIN=$previous_default_keychain" >> "$GITHUB_ENV"
+
+          if [ -z "$DEVELOPER_ID_APPLICATION_P12_BASE64" ]; then
+            echo "DEVELOPER_ID_APPLICATION_P12_BASE64 secret is required" >&2
+            exit 1
+          fi
+
+          printf '%s' "$DEVELOPER_ID_APPLICATION_P12_BASE64" | base64 -D > "$certificate_path"
+          rm -f "$keychain_path"
+          security create-keychain -p "$keychain_password" "$keychain_path"
+          security set-keychain-settings -lut 21600 "$keychain_path"
+          security unlock-keychain -p "$keychain_password" "$keychain_path"
+          security import "$certificate_path" -k "$keychain_path" -P "$DEVELOPER_ID_APPLICATION_P12_PASSWORD" -A -T /usr/bin/codesign -T /usr/bin/security
+          existing_keychains=()
+          while IFS= read -r existing_keychain; do
+            existing_keychain="$(printf '%s' "$existing_keychain" | sed 's/[ "]//g')"
+            if [ -n "$existing_keychain" ] && [ -e "$existing_keychain" ] && [[ "$existing_keychain" != *"/syncthing-release-signing-"*".keychain-db" ]]; then
+              existing_keychains+=("$existing_keychain")
+            fi
+          done < <(security list-keychains)
+          security list-keychains -s "$keychain_path" "${existing_keychains[@]}"
+          security list-keychains -d user -s "$keychain_path" "${existing_keychains[@]}" || true
+          security default-keychain -d user -s "$keychain_path" || true
+          security list-keychains
+          security list-keychains -d user || true
+          security set-key-partition-list -S apple-tool:,apple:,codesign: -s -k "$keychain_password" "$keychain_path"
+          identity_output="$(security find-identity -v -p codesigning "$keychain_path")"
+          printf '%s\n' "$identity_output"
+          security find-identity -v -p codesigning
+          codesign_identity_sha1="$(printf '%s\n' "$identity_output" | awk '/"Developer ID Application:/ { print $2; exit }')"
+          codesign_identity="$(printf '%s\n' "$identity_output" | sed -n 's/.*"\(Developer ID Application:[^"]*\)".*/\1/p' | head -n 1)"
+          if [ -z "$codesign_identity" ]; then
+            echo "Developer ID Application signing identity is required in DEVELOPER_ID_APPLICATION_P12_BASE64" >&2
+            exit 1
+          fi
+
+          probe_binary="$RUNNER_TEMP/codesign-probe"
+          cp /usr/bin/true "$probe_binary"
+          codesign --force --dryrun --sign "$codesign_identity" --keychain "$keychain_path" --options runtime --timestamp "$probe_binary"
+
+          echo "CUSTOM_RELEASE_CODESIGN_IDENTITY=$codesign_identity" >> "$GITHUB_ENV"
+          echo "CUSTOM_RELEASE_CODESIGN_IDENTITY_SHA1=$codesign_identity_sha1" >> "$GITHUB_ENV"
+        env:
+          DEVELOPER_ID_APPLICATION_P12_BASE64: ${{ secrets.DEVELOPER_ID_APPLICATION_P12_BASE64 }}
+          DEVELOPER_ID_APPLICATION_P12_PASSWORD: ${{ secrets.DEVELOPER_ID_APPLICATION_P12_PASSWORD }}
+
+      - name: Build patched Syncthing release
+        run: ./scripts/update-custom-release.sh
+        env:
+          CUSTOM_RELEASE_UPSTREAM_TAG: ${{ github.event.inputs.upstream_tag }}
+          CUSTOM_RELEASE_SUFFIX: ${{ github.event.inputs.suffix }}
+          CUSTOM_RELEASE_PUSH: "1"
+          CUSTOM_RELEASE_PUSH_BRANCH: "0"
+          CUSTOM_RELEASE_REMOTE: origin
+          CUSTOM_RELEASE_BUILDS: "darwin/arm64/zip/1 linux/amd64/tar/0 linux/arm64/tar/0"
+          CUSTOM_RELEASE_CODESIGN_TEAM_ID: "NG5W75WE8U"
+          CUSTOM_RELEASE_SIGN_DARWIN: "1"
+          CUSTOM_RELEASE_REQUIRE_GATEKEEPER_ASSESSMENT: "0"
+          CUSTOM_RELEASE_CREATE_GITEA_RELEASE: "1"
+          CUSTOM_RELEASE_TEA_REPO: felixfoertsch/syncthing
+
+      - name: Delete temporary keychain
+        if: always()
+        run: |
+          if [ -n "${CUSTOM_RELEASE_PREVIOUS_DEFAULT_KEYCHAIN:-}" ] && [ -e "$CUSTOM_RELEASE_PREVIOUS_DEFAULT_KEYCHAIN" ]; then
+            security default-keychain -d user -s "$CUSTOM_RELEASE_PREVIOUS_DEFAULT_KEYCHAIN" || true
+          fi
+          if [ -n "${CUSTOM_RELEASE_KEYCHAIN_PATH:-}" ]; then
+            security delete-keychain "$CUSTOM_RELEASE_KEYCHAIN_PATH" || true
+          fi

.github/workflows/build-infra-dockers.yaml

@@ -7,7 +7,7 @@ on:
       - infra-*
 
 env:
-  GO_VERSION: "~1.26.0"
+  GO_VERSION: "~1.27.0"
   CGO_ENABLED: "0"
   BUILD_USER: docker
   BUILD_HOST: github.syncthing.net
@@ -15,6 +15,7 @@ env:
 permissions:
   contents: read
   packages: write
+  id-token: write
 
 jobs:
   docker-syncthing:
@@ -30,11 +31,11 @@ jobs:
           - stupgrades
           - ursrv
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # was: actions/checkout@v5
         with:
           fetch-depth: 0
 
-      - uses: actions/setup-go@v6
+      - uses: actions/setup-go@4a3601121dd01d1626a1e23e37211e3254c1c06c # was: actions/setup-go@v6
         with:
           go-version: ${{ env.GO_VERSION }}
           check-latest: true
@@ -77,6 +78,7 @@ jobs:
           echo "TAGS=$tags" >> $GITHUB_ENV
 
       - name: Build and push
+        id: build
         uses: docker/build-push-action@ca052bb54ab0790a636c9b5f226502c73d547a25 # v5
         with:
           context: .
@@ -86,3 +88,11 @@ jobs:
           tags: ${{ env.TAGS }}
           labels: |
             org.opencontainers.image.revision=${{ github.sha }}
+
+      - name: Install Cosign
+        if: github.ref == 'refs/heads/infrastructure'
+        uses: sigstore/cosign-installer@ba7bc0a3fef59531c69a25acd34668d6d3fe6f22 # v4.1.0
+
+      - name: Sign image
+        if: github.ref == 'refs/heads/infrastructure'
+        run: cosign sign --yes --recursive ghcr.io/syncthing/infra/${{ matrix.pkg }}:latest@${{ steps.build.outputs.digest }}

.github/workflows/build-syncthing.yaml

@@ -18,7 +18,7 @@ env:
   # The go version to use for builds. We set check-latest to true when
   # installing, so we get the latest patch version that matches the
   # expression.
-  GO_VERSION: "~1.26.0"
+  GO_VERSION: "~1.27.0"
 
   # Optimize compatibility on the slow architectures.
   GOMIPS: softfloat
@@ -108,7 +108,7 @@ jobs:
         runner: ["windows-latest", "ubuntu-latest", "macos-latest"]
         # The oldest version in this list should match what we have in our go.mod.
         # Variables don't seem to be supported here, or we could have done something nice.
-        go: ["~1.25.0", "~1.26.0"]
+        go: ["~1.26.0", "~1.27.0"]
     runs-on: ${{ matrix.runner }}
     steps:
       - name: Set git to use LF
@@ -1012,6 +1012,7 @@ jobs:
     permissions:
       contents: read
       packages: write
+      id-token: write
     needs:
       - facts
     env:
@@ -1115,6 +1116,7 @@ jobs:
           mv bin/* script ctx
 
       - name: Build and push Docker image
+        id: build
         uses: docker/build-push-action@10e90e3645eae34f1e60eeb005ba3a3d33f178e8 # v6
         with:
           context: ctx
@@ -1126,6 +1128,22 @@ jobs:
             org.opencontainers.image.version=${{ env.VERSION }}
             org.opencontainers.image.revision=${{ github.sha }}
 
+      - name: Install Cosign
+        if: github.event_name == 'push'
+        uses: sigstore/cosign-installer@ba7bc0a3fef59531c69a25acd34668d6d3fe6f22 # v4.1.0
+
+      - name: Sign image
+        if: github.event_name == 'push'
+        env:
+          DIGEST: ${{ steps.build.outputs.digest }}
+        run: |
+          IFS="," read -ra tags <<< $DOCKER_TAGS
+          images=""
+          for tag in ${tags[@]}; do
+            images+="${tag}@${DIGEST} "
+          done
+          cosign sign --yes --recursive ${images}
+
   #
   # Sync images to Docker hub. This takes the images already pushed to GHCR
   # and copies them to Docker hub. Runs for releases only.

.github/workflows/custom-release.yml

@@ -0,0 +1,150 @@
+name: custom release
+
+permissions:
+  contents: write
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - ".github/workflows/custom-release.yml"
+      - "patches/**"
+      - "scripts/update-custom-release.sh"
+      - "scripts/sync-upstream.sh"
+  workflow_dispatch:
+    inputs:
+      upstream_tag:
+        description: "Optional upstream Syncthing tag, for example v2.1.3"
+        required: false
+      suffix:
+        description: "Optional custom release suffix, for example stignore.7"
+        required: false
+  schedule:
+    - cron: "17 04 * * *"
+
+jobs:
+  build-custom-release:
+    runs-on: macos-14
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+          cache: false
+
+      - name: Configure Git author
+        run: |
+          git config user.name "GitHub Actions"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+
+      - name: Mirror upstream and rebuild patched main
+        run: ./scripts/sync-upstream.sh
+        env:
+          SYNC_REMOTE: origin
+
+      - name: Import Developer ID certificate
+        run: |
+          set -euo pipefail
+          keychain_path="$RUNNER_TEMP/syncthing-release-signing.keychain-db"
+          keychain_password="$(openssl rand -hex 24)"
+          certificate_path="$RUNNER_TEMP/developer-id-application.p12"
+          previous_default_keychain="$(security default-keychain -d user 2>/dev/null | sed 's/[ "]//g' || true)"
+
+          echo "::add-mask::$keychain_password"
+          echo "CUSTOM_RELEASE_KEYCHAIN_PATH=$keychain_path" >> "$GITHUB_ENV"
+          echo "CUSTOM_RELEASE_KEYCHAIN_PASSWORD=$keychain_password" >> "$GITHUB_ENV"
+          echo "CUSTOM_RELEASE_CERTIFICATE_PATH=$certificate_path" >> "$GITHUB_ENV"
+          echo "CUSTOM_RELEASE_PREVIOUS_DEFAULT_KEYCHAIN=$previous_default_keychain" >> "$GITHUB_ENV"
+
+          if [ -z "$DEVELOPER_ID_APPLICATION_P12_BASE64" ]; then
+            echo "DEVELOPER_ID_APPLICATION_P12_BASE64 secret is required" >&2
+            exit 1
+          fi
+          if [ -z "$DEVELOPER_ID_APPLICATION_P12_PASSWORD" ]; then
+            echo "DEVELOPER_ID_APPLICATION_P12_PASSWORD secret is required" >&2
+            exit 1
+          fi
+
+          printf '%s' "$DEVELOPER_ID_APPLICATION_P12_BASE64" | base64 -D > "$certificate_path"
+          security create-keychain -p "$keychain_password" "$keychain_path"
+          security set-keychain-settings -lut 21600 "$keychain_path"
+          security unlock-keychain -p "$keychain_password" "$keychain_path"
+          security import "$certificate_path" -k "$keychain_path" -P "$DEVELOPER_ID_APPLICATION_P12_PASSWORD" -A -T /usr/bin/codesign -T /usr/bin/security
+          security list-keychains -d user -s "$keychain_path"
+          security default-keychain -d user -s "$keychain_path"
+          security set-key-partition-list -S apple-tool:,apple:,codesign: -s -k "$keychain_password" "$keychain_path"
+
+          identity_output="$(security find-identity -v -p codesigning "$keychain_path")"
+          printf '%s\n' "$identity_output"
+          codesign_identity="$(printf '%s\n' "$identity_output" | sed -n 's/.*"\(Developer ID Application:[^"]*\)".*/\1/p' | head -n 1)"
+          if [ -z "$codesign_identity" ]; then
+            echo "Developer ID Application signing identity is required in DEVELOPER_ID_APPLICATION_P12_BASE64" >&2
+            exit 1
+          fi
+
+          probe_binary="$RUNNER_TEMP/codesign-probe"
+          cp /usr/bin/true "$probe_binary"
+          codesign --force --dryrun --sign "$codesign_identity" --keychain "$keychain_path" --options runtime --timestamp "$probe_binary"
+          echo "CUSTOM_RELEASE_CODESIGN_IDENTITY=$codesign_identity" >> "$GITHUB_ENV"
+        env:
+          DEVELOPER_ID_APPLICATION_P12_BASE64: ${{ secrets.DEVELOPER_ID_APPLICATION_P12_BASE64 }}
+          DEVELOPER_ID_APPLICATION_P12_PASSWORD: ${{ secrets.DEVELOPER_ID_APPLICATION_P12_PASSWORD }}
+
+      - name: Build patched Syncthing release
+        run: |
+          case "$(uname -m)" in
+            arm64) darwin_arch=arm64 ;;
+            x86_64) darwin_arch=amd64 ;;
+            *) echo "Unsupported macOS runner architecture: $(uname -m)" >&2; exit 1 ;;
+          esac
+          export CUSTOM_RELEASE_BUILDS="darwin/$darwin_arch/zip/1 linux/amd64/tar/0 linux/arm64/tar/0"
+          ./scripts/update-custom-release.sh
+        env:
+          CUSTOM_RELEASE_UPSTREAM_TAG: ${{ github.event.inputs.upstream_tag }}
+          CUSTOM_RELEASE_SUFFIX: ${{ github.event.inputs.suffix }}
+          CUSTOM_RELEASE_PUSH: "1"
+          CUSTOM_RELEASE_PUSH_BRANCH: "0"
+          CUSTOM_RELEASE_REMOTE: origin
+          CUSTOM_RELEASE_CODESIGN_TEAM_ID: "NG5W75WE8U"
+          CUSTOM_RELEASE_SIGN_DARWIN: "1"
+          CUSTOM_RELEASE_REQUIRE_GATEKEEPER_ASSESSMENT: "0"
+          CUSTOM_RELEASE_CREATE_GITEA_RELEASE: "0"
+          GH_TOKEN: ${{ github.token }}
+
+      - name: Publish GitHub release
+        run: |
+          tag="${CUSTOM_RELEASE_UPSTREAM_TAG:-$(git ls-remote --refs --tags --sort='version:refname' https://github.com/syncthing/syncthing.git 'v[0-9]*' | awk '{ tag = $2; sub("refs/tags/", "", tag); if (tag ~ /^v[0-9]+\.[0-9]+\.[0-9]+$/) latest = tag } END { print latest }')}-$CUSTOM_RELEASE_SUFFIX"
+          if gh release view "$tag" >/dev/null 2>&1; then
+            echo "GitHub release $tag already exists; nothing to do."
+            exit 0
+          fi
+          assets=()
+          for asset in dist/*; do
+            [ -f "$asset" ] || continue
+            [ "$(basename "$asset")" = release-notes.md ] && continue
+            assets+=("$asset")
+          done
+          gh release create "$tag" "${assets[@]}" --title "$tag" --notes-file dist/release-notes.md --verify-tag
+        env:
+          CUSTOM_RELEASE_UPSTREAM_TAG: ${{ github.event.inputs.upstream_tag }}
+          CUSTOM_RELEASE_SUFFIX: ${{ github.event.inputs.suffix || 'stignore.7' }}
+          GH_TOKEN: ${{ github.token }}
+
+      - name: Delete temporary keychain
+        if: always()
+        run: |
+          if [ -n "${CUSTOM_RELEASE_PREVIOUS_DEFAULT_KEYCHAIN:-}" ] && [ -e "$CUSTOM_RELEASE_PREVIOUS_DEFAULT_KEYCHAIN" ]; then
+            security default-keychain -d user -s "$CUSTOM_RELEASE_PREVIOUS_DEFAULT_KEYCHAIN" || true
+          fi
+          if [ -n "${CUSTOM_RELEASE_KEYCHAIN_PATH:-}" ]; then
+            security delete-keychain "$CUSTOM_RELEASE_KEYCHAIN_PATH" || true
+          fi
+          if [ -n "${CUSTOM_RELEASE_CERTIFICATE_PATH:-}" ]; then
+            rm -f "$CUSTOM_RELEASE_CERTIFICATE_PATH"
+          fi

README.md

@@ -1,3 +1,11 @@
+# Syncthing with `.stignore` synchronization
+
+This fork synchronizes the root-level `.stignore` file as regular folder
+content, while keeping `.stfolder` and `.stversions` protected as Syncthing
+internals. The `upstream` branch mirrors the official Syncthing `main` branch;
+this fork's `main` branch and releases apply the `.stignore` synchronization
+patch.
+
 [![Syncthing][14]][15]
 
 ---

cmd/infra/stupgrades/main.go

@@ -224,7 +224,7 @@ func filterForLatest(rels []upgrade.Release) []upgrade.Release {
 	return filtered
 }
 
-var userAgentOSArchExp = regexp.MustCompile(`^syncthing.*\(.+ (\w+)-(\w+)\)$`)
+var userAgentOSArchExp = regexp.MustCompile(`^[Ss]yncthing.*\(.+ (\w+)-(\w+)\)$`)
 
 func filterForCompatibility(rels []upgrade.Release, ua, osv string) []upgrade.Release {
 	osArch := userAgentOSArchExp.FindStringSubmatch(ua)

cmd/infra/ursrv/serve/serve.go

@@ -311,7 +311,7 @@ func (s *server) handleNewData(w http.ResponseWriter, r *http.Request) {
 	bs, _ := io.ReadAll(lr)
 	if err := json.Unmarshal(bs, &rep); err != nil {
 		log.Error("Failed to decode JSON", slogutil.Error(err))
-		http.Error(w, "JSON Decode Error", http.StatusInternalServerError)
+		http.Error(w, "JSON Decode Error", http.StatusBadRequest)
 		return
 	}
 
@@ -321,7 +321,7 @@ func (s *server) handleNewData(w http.ResponseWriter, r *http.Request) {
 
 	if err := rep.Validate(); err != nil {
 		log.Error("Failed to validate report", slogutil.Error(err))
-		http.Error(w, "Validation Error", http.StatusInternalServerError)
+		http.Error(w, "Validation Error", http.StatusBadRequest)
 		return
 	}
 

cmd/stdiscosrv/apisrv.go

@@ -206,6 +206,7 @@ func (s *apiSrv) handleGET(w http.ResponseWriter, req *http.Request) {
 	rec, err := s.db.get(&deviceID)
 	if err != nil {
 		// some sort of internal error
+		slog.Warn("Failed to handle GET request", "id", reqID, "error", err)
 		lookupRequestsTotal.WithLabelValues("internal_error").Inc()
 		w.Header().Set("Retry-After", errorRetryAfterString())
 		http.Error(w, "Internal Server Error", http.StatusInternalServerError)
@@ -284,7 +285,7 @@ func (s *apiSrv) handlePOST(remoteAddr *net.TCPAddr, w http.ResponseWriter, req
 	}
 
 	if err := s.handleAnnounce(deviceID, addresses); err != nil {
-		slog.Debug("Failed to handle request", "id", reqID, "error", err)
+		slog.Warn("Failed to handle POST request", "id", reqID, "error", err)
 		announceRequestsTotal.WithLabelValues("internal_error").Inc()
 		w.Header().Set("Retry-After", errorRetryAfterString())
 		http.Error(w, "Internal Server Error", http.StatusInternalServerError)

cmd/stdiscosrv/main.go

@@ -35,10 +35,10 @@ const (
 
 	// Reannounce-After is set to reannounceAfterSeconds +
 	// random(reannounzeFuzzSeconds), similar for Retry-After
-	reannounceAfterSeconds = 3300
-	reannounzeFuzzSeconds  = 300
-	errorRetryAfterSeconds = 1500
-	errorRetryFuzzSeconds  = 300
+	reannounceAfterSeconds = 2400
+	reannounzeFuzzSeconds  = 1800
+	errorRetryAfterSeconds = 1800
+	errorRetryFuzzSeconds  = 900
 
 	// Retry for not found is notFoundRetrySeenSeconds for records we have
 	// seen an announcement for (but it's not active right now) and

cmd/syncthing/cli/client.go

@@ -18,6 +18,7 @@ import (
 	"net/http"
 	"strings"
 
+	"github.com/syncthing/syncthing/lib/build"
 	"github.com/syncthing/syncthing/lib/config"
 	"github.com/syncthing/syncthing/lib/events"
 	"github.com/syncthing/syncthing/lib/locations"
@@ -115,6 +116,7 @@ func (c *apiClient) Endpoint() string {
 
 func (c *apiClient) Do(req *http.Request) (*http.Response, error) {
 	req.Header.Set("X-Api-Key", c.apikey)
+	req.Header.Set("User-Agent", build.UserAgent())
 	resp, err := c.Client.Do(req)
 	if err != nil {
 		return nil, err

cmd/syncthing/crash_reporting.go

@@ -20,6 +20,7 @@ import (
 	"time"
 
 	"github.com/syncthing/syncthing/internal/slogutil"
+	"github.com/syncthing/syncthing/lib/build"
 )
 
 const (
@@ -81,6 +82,7 @@ func uploadPanicLog(ctx context.Context, urlBase, file string) error {
 	if err != nil {
 		return err
 	}
+	headReq.Header.Set("User-Agent", build.UserAgent())
 
 	// Set a reasonable timeout on the HEAD request
 	headCtx, headCancel := context.WithTimeout(ctx, headRequestTimeout)
@@ -101,6 +103,7 @@ func uploadPanicLog(ctx context.Context, urlBase, file string) error {
 	if err != nil {
 		return err
 	}
+	putReq.Header.Set("User-Agent", build.UserAgent())
 
 	// Set a reasonable timeout on the PUT request
 	putCtx, putCancel := context.WithTimeout(ctx, putRequestTimeout)

cmd/syncthing/main.go

@@ -374,6 +374,7 @@ func upgradeViaRest() error {
 	target := u.String()
 	r, _ := http.NewRequest(http.MethodPost, target, nil)
 	r.Header.Set("X-Api-Key", cfg.GUI().APIKey)
+	r.Header.Set("User-Agent", build.UserAgent())
 
 	tr := &http.Transport{
 		DialContext:     dialer.DialContext,
@@ -955,6 +956,7 @@ func (c browserCmd) Run() error {
 		if err != nil {
 			return err
 		}
+		req.Header.Set("User-Agent", build.UserAgent())
 		_, err = http.DefaultClient.Do(req) //nolint:bodyclose // we're exiting in a millisecond
 		if err != nil {
 			slog.Error("GUI not available", slogutil.Error(err))

compat.yaml

@@ -46,3 +46,8 @@
     linux: "3.2"
     windows: "10.0"
 
+- runtime: go1.27
+  requirements:
+    darwin: "22" # macOS 13 (Ventura)
+    linux: "3.2"
+    windows: "10.0"

go.mod

@@ -1,10 +1,10 @@
 module github.com/syncthing/syncthing
 
-go 1.25.0
+go 1.26.2
 
 require (
 	github.com/AudriusButkevicius/recli v0.0.7
-	github.com/alecthomas/kong v1.16.0
+	github.com/alecthomas/kong v1.16.1
 	github.com/aws/aws-sdk-go v1.55.8
 	github.com/calmh/incontainer v1.0.0
 	github.com/calmh/xdr v1.2.0
@@ -16,23 +16,23 @@ require (
 	github.com/gobwas/glob v0.2.3
 	github.com/gofrs/flock v0.13.0
 	github.com/hashicorp/golang-lru/v2 v2.0.7
-	github.com/jackpal/gateway v1.1.1
+	github.com/jackpal/gateway v1.2.0
 	github.com/jackpal/go-nat-pmp v1.0.2
 	github.com/jmoiron/sqlx v1.4.0
 	github.com/julienschmidt/httprouter v1.3.0
 	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51
 	github.com/maruel/panicparse/v2 v2.5.0
-	github.com/mattn/go-sqlite3 v1.14.48
+	github.com/mattn/go-sqlite3 v1.14.50
 	github.com/maxmind/geoipupdate/v6 v6.1.0
 	github.com/miscreant/miscreant.go v0.0.0-20200214223636-26d376326b75
 	github.com/oschwald/geoip2-golang v1.13.0
-	github.com/pierrec/lz4/v4 v4.1.27
-	github.com/prometheus/client_golang v1.24.0
+	github.com/pierrec/lz4/v4 v4.1.29
+	github.com/prometheus/client_golang v1.24.1
 	github.com/puzpuzpuz/xsync/v3 v3.5.1
-	github.com/quic-go/quic-go v0.60.0
-	github.com/rabbitmq/amqp091-go v1.13.0
+	github.com/quic-go/quic-go v0.61.0
+	github.com/rabbitmq/amqp091-go v1.14.0
 	github.com/rcrowley/go-metrics v0.0.0-20250401214520-65e299d6c5c9
-	github.com/shirou/gopsutil/v4 v4.26.6
+	github.com/shirou/gopsutil/v4 v4.26.7
 	github.com/syncthing/notify v0.0.0-20250528144937-c7027d4f7465
 	github.com/syndtr/goleveldb v1.0.1-0.20220721030215-126854af5e6d
 	github.com/thejerf/suture/v4 v4.0.6
@@ -40,14 +40,14 @@ require (
 	github.com/vitrun/qart v0.0.0-20160531060029-bf64b92db6b0
 	github.com/willabides/kongplete v0.4.0
 	github.com/wlynxg/anet v0.0.5
-	golang.org/x/crypto v0.54.0
-	golang.org/x/exp v0.0.0-20260718201538-764159d718ef
-	golang.org/x/net v0.57.0
+	golang.org/x/crypto v0.55.0
+	golang.org/x/exp v0.0.0-20260813180055-c1d0aacb2297
+	golang.org/x/net v0.58.0
 	golang.org/x/sys v0.47.0
-	golang.org/x/text v0.40.0
+	golang.org/x/text v0.41.0
 	golang.org/x/time v0.15.0
-	google.golang.org/protobuf v1.36.11
-	modernc.org/sqlite v1.54.0
+	google.golang.org/protobuf v1.36.12
+	modernc.org/sqlite v1.57.0
 	sigs.k8s.io/yaml v1.6.0
 )
 
@@ -58,48 +58,41 @@ require (
 	github.com/certifi/gocertifi v0.0.0-20210507211836-431795d63e8d // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/cpuguy83/go-md2man/v2 v2.0.7 // indirect
-	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/dustin/go-humanize v1.0.1 // indirect
-	github.com/ebitengine/purego v0.10.0 // indirect
+	github.com/ebitengine/purego v0.10.2 // indirect
 	github.com/fsnotify/fsnotify v1.7.0 // indirect
 	github.com/go-asn1-ber/asn1-ber v1.5.8 // indirect
 	github.com/go-ole/go-ole v1.3.0 // indirect
 	github.com/golang/snappy v0.0.4 // indirect
-	github.com/google/pprof v0.0.0-20250423184734-337e5dd93bb4 // indirect
 	github.com/google/uuid v1.6.0 // indirect
 	github.com/hashicorp/errwrap v1.1.0 // indirect
 	github.com/hashicorp/go-multierror v1.1.1 // indirect
 	github.com/jmespath/go-jmespath v0.4.0 // indirect
 	github.com/lufia/plan9stats v0.0.0-20240909124753-873cd0166683 // indirect
-	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/mattn/go-isatty v0.0.24 // indirect
 	github.com/maxbrunsfeld/counterfeiter/v6 v6.12.0 // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/ncruces/go-strftime v1.0.0 // indirect
 	github.com/nxadm/tail v1.4.11 // indirect
 	github.com/oschwald/maxminddb-golang v1.13.1 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
-	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/posener/complete v1.2.3 // indirect
 	github.com/power-devops/perfstat v0.0.0-20240221224432-82ca36839d55 // indirect
 	github.com/prometheus/client_model v0.6.2 // indirect
-	github.com/prometheus/common v0.70.0 // indirect
+	github.com/prometheus/common v0.70.1 // indirect
 	github.com/prometheus/procfs v0.21.1 // indirect
 	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
 	github.com/riywo/loginshell v0.0.0-20200815045211-7d26008be1ab // indirect
-	github.com/rogpeppe/go-internal v1.12.0 // indirect
 	github.com/russross/blackfriday/v2 v2.1.0 // indirect
-	github.com/stretchr/objx v0.5.2 // indirect
-	github.com/stretchr/testify v1.11.1 // indirect
 	github.com/tklauser/go-sysconf v0.3.16 // indirect
 	github.com/tklauser/numcpus v0.11.0 // indirect
 	github.com/yusufpapurcu/wmi v1.2.4 // indirect
 	go.yaml.in/yaml/v2 v2.4.4 // indirect
-	golang.org/x/mod v0.38.0 // indirect
+	golang.org/x/mod v0.39.0 // indirect
 	golang.org/x/sync v0.22.0 // indirect
-	golang.org/x/telemetry v0.0.0-20260708182218-49f421fb7959 // indirect
-	golang.org/x/tools v0.48.0 // indirect
-	gopkg.in/yaml.v3 v3.0.1 // indirect
-	modernc.org/libc v1.74.1 // indirect
+	golang.org/x/telemetry v0.0.0-20260811182544-a038080d80e5 // indirect
+	golang.org/x/tools v0.49.0 // indirect
+	modernc.org/libc v1.74.4 // indirect
 	modernc.org/mathutil v1.7.1 // indirect
 	modernc.org/memory v1.11.0 // indirect
 )

go.sum

@@ -7,8 +7,8 @@ github.com/Azure/go-ntlmssp v0.1.1/go.mod h1:NYqdhxd/8aAct/s4qSYZEerdPuH1liG2/X9
 github.com/BurntSushi/toml v1.5.0/go.mod h1:ukJfTF/6rtPPRCnwkur4qwRxa8vTRFBF0uk2lLoLwho=
 github.com/alecthomas/assert/v2 v2.11.0 h1:2Q9r3ki8+JYXvGsDyBXwH3LcJ+WK5D0gc5E8vS6K3D0=
 github.com/alecthomas/assert/v2 v2.11.0/go.mod h1:Bze95FyfUr7x34QZrjL+XP+0qgp/zg8yS+TtBj1WA3k=
-github.com/alecthomas/kong v1.16.0 h1:g92/kUxBcdcTPOM79yE63viJgtcp5dNyrB3/O2cjYT4=
-github.com/alecthomas/kong v1.16.0/go.mod h1:wrlbXem1CWqUV5Vbmss5ISYhsVPkBb1Yo7YKJghju2I=
+github.com/alecthomas/kong v1.16.1 h1:ixhCt93XkJ98kGposQ54+bl0IK6XwqB40AsMynU7Z8E=
+github.com/alecthomas/kong v1.16.1/go.mod h1:wrlbXem1CWqUV5Vbmss5ISYhsVPkBb1Yo7YKJghju2I=
 github.com/alecthomas/repr v0.5.2 h1:SU73FTI9D1P5UNtvseffFSGmdNci/O6RsqzeXJtP0Qs=
 github.com/alecthomas/repr v0.5.2/go.mod h1:Fr0507jx4eOXV7AlPV6AVZLYrLIuIeSOWtW57eE/O/4=
 github.com/alexbrainman/sspi v0.0.0-20250919150558-7d374ff0d59e h1:4dAU9FXIyQktpoUAgOJK3OTFc/xug0PCXYCqU0FgDKI=
@@ -45,8 +45,8 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
 github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
-github.com/ebitengine/purego v0.10.0 h1:QIw4xfpWT6GWTzaW5XEKy3HXoqrJGx1ijYHzTF0/ISU=
-github.com/ebitengine/purego v0.10.0/go.mod h1:iIjxzd6CiRiOG0UyXP+V1+jWqUXVjPKLAI0mRfJZTmQ=
+github.com/ebitengine/purego v0.10.2 h1:W809HbnvzAxgdm+aOvlSekrM16wGCdT/e76+9tS7gzE=
+github.com/ebitengine/purego v0.10.2/go.mod h1:iIjxzd6CiRiOG0UyXP+V1+jWqUXVjPKLAI0mRfJZTmQ=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
 github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4IgpuI1SZQ=
 github.com/fsnotify/fsnotify v1.5.4/go.mod h1:OVB6XrOHzAwXMpEM7uPOzcehqUV2UqJxmVXmkdnm1bU=
@@ -86,8 +86,8 @@ github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeN
 github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
 github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
 github.com/google/pprof v0.0.0-20210407192527-94a9f03dee38/go.mod h1:kpwsk12EmLew5upagYY7GY0pfYCcupk39gWOCRROcvE=
-github.com/google/pprof v0.0.0-20250423184734-337e5dd93bb4 h1:gD0vax+4I+mAj+jEChEf25Ia07Jq7kYOFO5PPhAxFl4=
-github.com/google/pprof v0.0.0-20250423184734-337e5dd93bb4/go.mod h1:5hDyRhoBCxViHszMt12TnOpEI4VVi+U8Gm9iphldiMA=
+github.com/google/pprof v0.0.0-20260802141513-ef3492d7dac3 h1:LMLX+LgTNWpfvCBdFebv6EsYotImrt/Ppc5cXIriCSo=
+github.com/google/pprof v0.0.0-20260802141513-ef3492d7dac3/go.mod h1:jl5iWTm0/hd5PjEYEOuwAJ57L/CibdZfrqZ5XA5GrCk=
 github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/hashicorp/errwrap v1.0.0/go.mod h1:YH+1FKiLXxHSkmPseP+kNlulaMuP3n2brvKWEqk/Jc4=
@@ -104,6 +104,8 @@ github.com/hexops/gotextdiff v1.0.3 h1:gitA9+qJrrTCsiCl7+kh75nPqQt1cx4ZkudSTLoUq
 github.com/hexops/gotextdiff v1.0.3/go.mod h1:pSWU5MAI3yDq+fZBTazCSJysOMbxWL1BSow5/V2vxeg=
 github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
 github.com/ianlancetaylor/demangle v0.0.0-20200824232613-28f6c0f3b639/go.mod h1:aSSvb/t6k1mPoxDqO4vJh6VOCGPwU4O0C2/Eqndh1Sc=
+github.com/jackpal/gateway v1.2.0 h1:euPRe4t7JfTaqC5Lr78HXl2wSHo54XndTtiAcIxkb5g=
+github.com/jackpal/gateway v1.2.0/go.mod h1:/jchvRi4HukAqV24da70iaBMFcSrX3rNWdR5K9VHd0A=
 github.com/jackpal/go-nat-pmp v1.0.2 h1:KzKSgb7qkJvOUTqYl9/Hg/me3pWgBmERKrTGD7BdWus=
 github.com/jackpal/go-nat-pmp v1.0.2/go.mod h1:QPH045xvCAeXUZOxsnwmrtiCoxIr9eob+4orBN1SBKc=
 github.com/jcmturner/aescts/v2 v2.0.0 h1:9YKLH6ey7H4eDBXW8khjYslgyqG2xZikXP0EQFKrle8=
@@ -128,27 +130,21 @@ github.com/julienschmidt/httprouter v1.3.0 h1:U0609e9tgbseu3rBINet9P48AI/D3oJs4d
 github.com/julienschmidt/httprouter v1.3.0/go.mod h1:JR6WtHb+2LUe8TCKY3cZOxFyyO8IZAc4RVcycCCAKdM=
 github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51 h1:Z9n2FFNUXsshfwJMBgNA0RU6/i7WVaAegv3PtuIHPMs=
 github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51/go.mod h1:CzGEWj7cYgsdH8dAjBGEr58BoE7ScuLd+fwFZ44+/x8=
-github.com/klauspost/compress v1.19.0 h1:sXLILfc9jV2QYWkzFOPWStmcUVH2RHEB1JCdY2oVvCQ=
-github.com/klauspost/compress v1.19.0/go.mod h1:cwPg85FWrGar70rWktvGQj8/hthj3wpl0PGDogxkrSQ=
-github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
-github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
-github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
-github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
+github.com/klauspost/compress v1.19.1 h1:VsB4HPswih7mmZ8WleSFQ75c/Ui1M4trX5oAsJnhSlk=
+github.com/klauspost/compress v1.19.1/go.mod h1:cwPg85FWrGar70rWktvGQj8/hthj3wpl0PGDogxkrSQ=
 github.com/kylelemons/godebug v1.1.0 h1:RPNrshWIDI6G2gRW9EHilWtl7Z6Sb1BR0xunSBf0SNc=
 github.com/kylelemons/godebug v1.1.0/go.mod h1:9/0rRGxNHcop5bhtWyNeEfOS8JIWk580+fNqagV/RAw=
 github.com/lib/pq v1.10.9 h1:YXG7RB+JIjhP29X+OtkiDnYaXQwpS4JEWq7dtCCRUEw=
 github.com/lib/pq v1.10.9/go.mod h1:AlVN5x4E4T544tWzH6hKfbfQvm3HdbOxrmggDNAPY9o=
 github.com/lufia/plan9stats v0.0.0-20240909124753-873cd0166683 h1:7UMa6KCCMjZEMDtTVdcGu0B1GmmC7QJKiCCjyTAWQy0=
 github.com/lufia/plan9stats v0.0.0-20240909124753-873cd0166683/go.mod h1:ilwx/Dta8jXAgpFYFvSWEMwxmbWXyiUHkd5FwyKhb5k=
-github.com/marbens-arch/gateway v1.1.2-0.20260308173556-c567cc04e7d4 h1:8TAc8a26Pp0+8I6rj43BqhMi84D1zvtY0sPzO3IKnBw=
-github.com/marbens-arch/gateway v1.1.2-0.20260308173556-c567cc04e7d4/go.mod h1:Tl1vZVtUaXx5j6P5HFmv45alhEi4yHHLfT4PRbB7eyw=
 github.com/maruel/panicparse/v2 v2.5.0 h1:yCtuS0FWjfd0RTYMXGpDvWcb0kINm8xJGu18/xMUh00=
 github.com/maruel/panicparse/v2 v2.5.0/go.mod h1:DA2fDiBk63bKfBf4CVZP9gb4fuvzdPbLDsSI873hweQ=
-github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
-github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
+github.com/mattn/go-isatty v0.0.24 h1:tGZZoVgT/KiqK1c8ocVLeDS8BSWMRd47J3Lbz7vsReI=
+github.com/mattn/go-isatty v0.0.24/go.mod h1:nMCL3Zebbrt45jsMDgnfIwz6ydEQApk5oEI3HqDio6A=
 github.com/mattn/go-sqlite3 v1.14.22/go.mod h1:Uh1q+B4BYcTPb+yiD3kU8Ct7aC0hY9fxUwlHK0RXw+Y=
-github.com/mattn/go-sqlite3 v1.14.48 h1:7XHIgl0a8HwOaiK4E47ozLkST78rR9+OtNGx27D/TFs=
-github.com/mattn/go-sqlite3 v1.14.48/go.mod h1:6JTjA44L93a0QCyJef5YvlPoKXntQPjzWv5gtm9sB6w=
+github.com/mattn/go-sqlite3 v1.14.50 h1:dmdFvo1XG4MPzA4IkAmE9upVz/Nj31uRoM5+jC8hYbY=
+github.com/mattn/go-sqlite3 v1.14.50/go.mod h1:6JTjA44L93a0QCyJef5YvlPoKXntQPjzWv5gtm9sB6w=
 github.com/maxbrunsfeld/counterfeiter/v6 v6.12.0 h1:aOeI7xAOVdK+R6xbVsZuU9HmCZYmQVmZgPf9xJUd2Sg=
 github.com/maxbrunsfeld/counterfeiter/v6 v6.12.0/go.mod h1:0hZWbtfeCYUQeAQdPLUzETiBhUSns7O6LDj9vH88xKA=
 github.com/maxmind/geoipupdate/v6 v6.1.0 h1:sdtTHzzQNJlXF5+fd/EoPTucRHyMonYt/Cok8xzzfqA=
@@ -179,8 +175,8 @@ github.com/oschwald/geoip2-golang v1.13.0 h1:Q44/Ldc703pasJeP5V9+aFSZFmBN7DKHbNs
 github.com/oschwald/geoip2-golang v1.13.0/go.mod h1:P9zG+54KPEFOliZ29i7SeYZ/GM6tfEL+rgSn03hYuUo=
 github.com/oschwald/maxminddb-golang v1.13.1 h1:G3wwjdN9JmIK2o/ermkHM+98oX5fS+k5MbwsmL4MRQE=
 github.com/oschwald/maxminddb-golang v1.13.1/go.mod h1:K4pgV9N/GcK694KSTmVSDTODk4IsCNThNdTmnaBZ/F8=
-github.com/pierrec/lz4/v4 v4.1.27 h1:+PhzhWDrjRj89TH2sw43nE3+4+W8lSxIuQadEHZyjUk=
-github.com/pierrec/lz4/v4 v4.1.27/go.mod h1:EoQMVJgeeEOMsCqCzqFm2O0cJvljX2nGZjcRIPL34O4=
+github.com/pierrec/lz4/v4 v4.1.29 h1:CDQY6qZOLI4DW0Nx6R1vRrifrCeQHnNXkMb0hZWXFjg=
+github.com/pierrec/lz4/v4 v4.1.29/go.mod h1:EoQMVJgeeEOMsCqCzqFm2O0cJvljX2nGZjcRIPL34O4=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
@@ -190,41 +186,40 @@ github.com/posener/complete v1.2.3 h1:NP0eAhjcjImqslEwo/1hq7gpajME0fTLTezBKDqfXq
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@@ -267,13 +262,13 @@ go.yaml.in/yaml/v3 v3.0.4/go.mod h1:DhzuOOF2ATzADvBadXxruRBLzYTpT36CKvDb3+aBEFg=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
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 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
-golang.org/x/crypto v0.54.0 h1:YLIA59K4fiNzHzjnZt2tUJQjQtUWfWbeHBqKtk3eScw=
-golang.org/x/crypto v0.54.0/go.mod h1:KWL8ny2AZdGR2cWmzeHrp2azQPGogOv+HeQaVEXC2dk=
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-golang.org/x/mod v0.38.0 h1:MECBjubtXD7yj4HrhIUcywNaGeNVUdfVnxmPajOk4yk=
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@@ -282,8 +277,8 @@ golang.org/x/net v0.0.0-20201021035429-f5854403a974/go.mod h1:sp8m0HH+o8qH0wwXwY
 golang.org/x/net v0.0.0-20210428140749-89ef3d95e781/go.mod h1:OJAsFXCWl8Ukc7SiCT/9KSuxbyM7479/AVlXFRxuMCk=
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@@ -310,26 +305,25 @@ golang.org/x/sys v0.0.0-20220412211240-33da011f77ad/go.mod h1:oPkhp1MJrh7nUepCBc
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-golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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@@ -343,11 +337,9 @@ google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzi
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-google.golang.org/protobuf v1.36.11 h1:fV6ZwhNocDyBLK0dj+fg8ektcVegBBuEolpbTQyBNVE=
-google.golang.org/protobuf v1.36.11/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
+google.golang.org/protobuf v1.36.12 h1:pJOKDDOyeXErUroCihFAd5LQuwXBSpVnKGrj5o/fwxc=
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 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
@@ -360,8 +352,8 @@ gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-modernc.org/cc/v4 v4.29.0 h1:CXgwL8cvxmyzBQZzbSl/6xFtMCryb6u8IOqDci39cgc=
-modernc.org/cc/v4 v4.29.0/go.mod h1:OnovgIhbbMXMu1aISnJ0wvVD1KnW+cAUJkIrAWh+kVI=
+modernc.org/cc/v4 v4.29.1 h1:MKgdCV3WykTSPqpVrnxdEDS0HEd2FHpKZDzxzU5LyeI=
+modernc.org/cc/v4 v4.29.1/go.mod h1:OnovgIhbbMXMu1aISnJ0wvVD1KnW+cAUJkIrAWh+kVI=
 modernc.org/ccgo/v4 v4.34.6 h1:sBgfIwyN0TQ9C5hwIeuqyeAKyMWnbvj2fvpF4L11uzU=
 modernc.org/ccgo/v4 v4.34.6/go.mod h1:SZ8YcN9NG7XVsQYdm6jYBvi8PQP1qi+kqB6OhjqI3Fk=
 modernc.org/fileutil v1.4.0 h1:j6ZzNTftVS054gi281TyLjHPp6CPHr2KCxEXjEbD6SM=
@@ -372,8 +364,8 @@ modernc.org/gc/v3 v3.1.4 h1:2g65LGVSmFQrXeITAw97x7hCRvZFcyE1uDP+7Vng7JI=
 modernc.org/gc/v3 v3.1.4/go.mod h1:HFK/6AGESC7Ex+EZJhJ2Gni6cTaYpSMmU/cT9RmlfYY=
 modernc.org/goabi0 v0.2.0 h1:HvEowk7LxcPd0eq6mVOAEMai46V+i7Jrj13t4AzuNks=
 modernc.org/goabi0 v0.2.0/go.mod h1:CEFRnnJhKvWT1c1JTI3Avm+tgOWbkOu5oPA8eH8LnMI=
-modernc.org/libc v1.74.1 h1:bdR4VTKFMC4966QSNZ05XLGI/VwzVa2kTUX51Dm0riQ=
-modernc.org/libc v1.74.1/go.mod h1:uH4t5bOx3G3g9Xcmj10YKlTcVISlRDwv8VoQJG9n8Os=
+modernc.org/libc v1.74.4 h1:fX1Omw4o2/1C2iRkkIsrQTasJQldLhRmuPreXLoWs9k=
+modernc.org/libc v1.74.4/go.mod h1:eeQAS9W3sZeKYMFubydxJpII9ybHWshk+7or7bLG9co=
 modernc.org/mathutil v1.7.1 h1:GCZVGXdaN8gTqB1Mf/usp1Y/hSqgI2vAGGP4jZMCxOU=
 modernc.org/mathutil v1.7.1/go.mod h1:4p5IwJITfppl0G4sUEDtCr4DthTaT47/N3aT6MhfgJg=
 modernc.org/memory v1.11.0 h1:o4QC8aMQzmcwCK3t3Ux/ZHmwFPzE6hf2Y5LbkRs+hbI=
@@ -382,8 +374,8 @@ modernc.org/opt v0.2.0 h1:tGyef5ApycA7FSEOMraay9SaTk5zmbx7Tu+cJs4QKZg=
 modernc.org/opt v0.2.0/go.mod h1:03fq9lsNfvkYSfxrfUhZCWPk1lm4cq4N+Bh//bEtgns=
 modernc.org/sortutil v1.2.1 h1:+xyoGf15mM3NMlPDnFqrteY07klSFxLElE2PVuWIJ7w=
 modernc.org/sortutil v1.2.1/go.mod h1:7ZI3a3REbai7gzCLcotuw9AC4VZVpYMjDzETGsSMqJE=
-modernc.org/sqlite v1.54.0 h1:JCxR4qwkJvOaqAoYcgDoO25Nc+ROg6EJ2LfBVzdrgog=
-modernc.org/sqlite v1.54.0/go.mod h1:4ntCLuNmnH8+GNqjka1wNg7KJd5/Hi5FYp8K+XQ7GZw=
+modernc.org/sqlite v1.57.0 h1:qNQP6xnx5M0ISNtlnxoOX0+cD5bJ0/gr9aMmndFczzg=
+modernc.org/sqlite v1.57.0/go.mod h1:yCJ2cmAaIkHQ25oXWrF8H4O1lIfPYPR26yCEDj2P3pQ=
 modernc.org/strutil v1.2.1 h1:UneZBkQA+DX2Rp35KcM69cSsNES9ly8mQWD71HKlOA0=
 modernc.org/strutil v1.2.1/go.mod h1:EHkiggD70koQxjVdSBM3JKM7k6L0FbGE5eymy9i3B9A=
 modernc.org/token v1.1.0 h1:Xl7Ap9dKaEs5kLoOQeQmPWevfnk/DM5qcLcYlA8ys6Y=

gui/default/assets/lang/lang-fa.json

@@ -1,2 +1,31 @@
 {
+    "A device with that ID is already added.": "یک دستگاه با این شناسه قبلاً اضافه شده است.",
+    "A negative number of days doesn't make sense.": "تعداد روزهای منفی قابل قبول نیست.",
+    "A new major version may not be compatible with previous versions.": "نسخه جدید اصلی ممکن است با نسخه قبلی سازگار نباشد.",
+    "API Key": "کلید API",
+    "About": "درباره",
+    "Action": "عمل",
+    "Actions": "اعمال",
+    "Active filter rules": "قوانین فیلتر فعال",
+    "Add": "افزودن",
+    "Add Device": "افزودن دستگاه",
+    "Add Folder": "افزودن پوشه",
+    "Add Remote Device": "افزودن دستگاه دیگر",
+    "Add filter entry": "افزودن ورودی فیلتر",
+    "Add ignore patterns": "افزودن الگوی نادیده گرفتن",
+    "Add new folder?": "افزودن پوشه جدید؟",
+    "Address": "نشانی",
+    "Addresses": "نشانی‌ها",
+    "Advanced": "پیشرفته",
+    "Advanced Configuration": "پیکربندی پیشرفته",
+    "All Data": "تمام داده‌ها",
+    "All Time": "تمام زمان",
+    "All folders shared with this device must be protected by a password, such that all sent data is unreadable without the given password.": "تمام پوشه‌های به اشتراک گذاشته در این دستگاه باید با یک گذرواژه محافظت شوند، داده‌های ارسال شده بدون گذرواژه غیرقابل خواندن هستند.",
+    "Allow Anonymous Usage Reporting?": "اجازه دادن به ارسال ناشناس گزارش استفاده؟",
+    "Allowed Networks": "شبکه‌های مجاز",
+    "Alphabetic": "الفبایی",
+    "Altered by ignoring deletes.": "با نادیده گرفتن حذف‌ها تغییر داده شد.",
+    "LDAP": "LDAP",
+    "TCP WAN": "TCPWAN",
+    "Take me back": "برگرداندن"
 }

gui/default/assets/lang/lang-ro-RO.json

@@ -50,6 +50,7 @@
     "Automatically create or share folders that this device advertises at the default path.": "Crează sau partajează automat mapele anunțate de acest dispozitiv la calea implicită.",
     "Available debug logging facilities:": "Facilități disponibile pentru registrul de depanare:",
     "Be careful!": "Fii atent!",
+    "Block Indexing": "Blochează indexarea",
     "Body:": "Corp:",
     "Bugs": "Bug-uri",
     "Cancel": "Renunță",
@@ -82,6 +83,7 @@
     "Custom Range": "Interval Personalizat",
     "Danger!": "Pericol!",
     "Database Location": "Locația Bazei de Date",
+    "Debug": "Depanează",
     "Debugging Facilities": "Facilități de Depanare",
     "Default": "Implicit",
     "Default Configuration": "Configurare implicită",
@@ -97,6 +99,7 @@
     "Device": "Dispozitiv",
     "Device \"{%name%}\" ({%device%} at {%address%}) wants to connect. Add new device?": "Dispozitivul \"{{name}}\" ({{device}} la {{address}}) vrea să se conecteze. Adaugă un dispozitiv nou?",
     "Device Certificate": "Certificatul dispozitivului",
+    "Device Group": "Grup de dispozitive",
     "Device ID": "ID Dispozitiv",
     "Device Identification": "Identificare Dispozitiv",
     "Device Name": "Nume Dispozitiv",

gui/default/index.html

@@ -1017,6 +1017,9 @@
       </div> <!-- /row -->
 
     </div> <!-- /container -->
+    <footer class="container text-center text-muted small" aria-label="Custom build marker">
+      It syncs .stignore now!
+    </footer>
   </div> <!-- /ng-cloak -->
 
   <ng-include src="'syncthing/core/networkErrorDialogView.html'"></ng-include>

gui/default/syncthing/core/aboutModalView.html

@@ -59,7 +59,6 @@ Jakob Borg, Audrius Butkevicius, Simon Frei, Tomasz Wilczyński, Alexander Graf,
           <li><a href="https://github.com/ccding/go-stun">ccding/go-stun</a>, Copyright &copy; 2016 Cong Ding.</li>
           <li><a href="https://github.com/cespare/xxhash/v2">cespare/xxhash/v2</a>, Copyright &copy; 2016 Caleb Spare.</li>
           <li><a href="https://github.com/cpuguy83/go-md2man/v2">cpuguy83/go-md2man/v2</a>, Copyright &copy; 2014 Brian Goff.</li>
-          <li><a href="https://github.com/davecgh/go-spew">davecgh/go-spew</a>, Copyright &copy; 2012-2016 Dave Collins.</li>
           <li><a href="https://github.com/go-asn1-ber/asn1-ber">go-asn1-ber/asn1-ber</a>, Copyright &copy; 2011-2015 Michael Mitton (mmitton@gmail.com).</li>
           <li><a href="https://github.com/go-ldap/ldap">go-ldap/ldap</a>, Copyright &copy; 2011-2015 Michael Mitton (mmitton@gmail.com).</li>
           <li><a href="https://github.com/gobwas/glob">gobwas/glob</a>, Copyright &copy; 2016 Sergey Kamardin.</li>
@@ -67,7 +66,6 @@ Jakob Borg, Audrius Butkevicius, Simon Frei, Tomasz Wilczyński, Alexander Graf,
           <li><a href="https://github.com/golang/snappy">golang/snappy</a>, Copyright &copy; 2011 The Snappy-Go Authors.</li>
           <li><a href="https://github.com/protocolbuffers/protobuf-go">google.golang.org/protobuf</a>, Copyright &copy; 2018 The Go Authors.</li>
           <li><a href="https://github.com/google/uuid">google/uuid</a>, Copyright &copy; 2009,2014 Google Inc.</li>
-          <li><a href="https://gopkg.in/yaml.v3">gopkg.in/yaml.v3</a>, Copyright &copy; 2025, the gopkg.in/yaml.v3 authors.</li>
           <li><a href="https://github.com/hashicorp/errwrap">hashicorp/errwrap</a>, Copyright &copy; 2014 HashiCorp, Inc.</li>
           <li><a href="https://github.com/hashicorp/go-multierror">hashicorp/go-multierror</a>, Copyright &copy; 2014 HashiCorp, Inc.</li>
           <li><a href="https://github.com/hashicorp/golang-lru">hashicorp/golang-lru</a>, Copyright &copy; 2014 HashiCorp, Inc.</li>
@@ -81,7 +79,6 @@ Jakob Borg, Audrius Butkevicius, Simon Frei, Tomasz Wilczyński, Alexander Graf,
           <li><a href="https://github.com/munnerz/goautoneg">munnerz/goautoneg</a>, Copyright &copy; 2011, Open Knowledge Foundation Ltd.</li>
           <li><a href="https://github.com/pierrec/lz4">pierrec/lz4</a>, Copyright &copy; 2015 Pierre Curto.</li>
           <li><a href="https://github.com/pkg/errors">pkg/errors</a>, Copyright &copy; 2015, Dave Cheney.</li>
-          <li><a href="https://github.com/pmezard/go-difflib">pmezard/go-difflib</a>, Copyright &copy; 2013, Patrick Mezard.</li>
           <li><a href="https://github.com/posener/complete">posener/complete</a>, Copyright &copy; 2017 Eyal Posener.</li>
           <li><a href="https://github.com/prometheus/client_golang">prometheus/client_golang</a>, Copyright 2012-2015 The Prometheus Authors.</li>
           <li><a href="https://github.com/prometheus/client_model">prometheus/client_model</a>, Copyright &copy; 2025, the prometheus/client_model authors.</li>
@@ -92,8 +89,6 @@ Jakob Borg, Audrius Butkevicius, Simon Frei, Tomasz Wilczyński, Alexander Graf,
           <li><a href="https://github.com/riywo/loginshell">riywo/loginshell</a>, Copyright &copy; 2019 Ryosuke IWANAGA.</li>
           <li><a href="https://github.com/russross/blackfriday/v2">russross/blackfriday/v2</a>, Copyright &copy; 2011 Russ Ross.</li>
           <li><a href="https://github.com/shirou/gopsutil">shirou/gopsutil</a>, Copyright &copy; 2014, WAKAYAMA Shirou.</li>
-          <li><a href="https://github.com/stretchr/objx">stretchr/objx</a>, Copyright &copy; 2014 Stretchr, Inc.</li>
-          <li><a href="https://github.com/stretchr/testify">stretchr/testify</a>, Copyright &copy; 2012-2020 Mat Ryer, Tyler Bunnell and contributors.</li>
           <li><a href="https://github.com/syndtr/goleveldb">syndtr/goleveldb</a>, Copyright &copy; 2012 Suryandaru Triandana.</li>
           <li><a href="https://github.com/thejerf/suture">thejerf/suture</a>, Copyright &copy; 2014-2015 Barracuda Networks, Inc.</li>
           <li><a href="https://github.com/tklauser/go-sysconf">tklauser/go-sysconf</a>, Copyright &copy; 2018-2022, Tobias Klauser.</li>

lib/api/auto/custom_marker_test.go

@@ -0,0 +1,42 @@
+// Copyright (C) 2026 The Syncthing Authors.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at https://mozilla.org/MPL/2.0/.
+
+package auto
+
+import (
+	"compress/gzip"
+	"io"
+	"strings"
+	"testing"
+)
+
+const customBuildMarker = "It syncs .stignore now!"
+
+func TestCustomBuildMarkerIsEmbedded(t *testing.T) {
+	asset, ok := Assets()["default/index.html"]
+	if !ok {
+		t.Fatal("default/index.html is missing from embedded GUI assets")
+	}
+
+	content := asset.Content
+	if asset.Gzipped {
+		reader, err := gzip.NewReader(strings.NewReader(asset.Content))
+		if err != nil {
+			t.Fatal(err)
+		}
+		defer reader.Close()
+
+		data, err := io.ReadAll(reader)
+		if err != nil {
+			t.Fatal(err)
+		}
+		content = string(data)
+	}
+
+	if !strings.Contains(content, customBuildMarker) {
+		t.Fatalf("embedded GUI assets do not contain custom build marker %q", customBuildMarker)
+	}
+}

lib/build/build.go

@@ -127,6 +127,10 @@ func LongVersionFor(program string) string {
 	return v
 }
 
+func UserAgent() string {
+	return fmt.Sprintf(`Syncthing/%s (%s %s-%s)`, strings.TrimPrefix(Version, "v"), runtime.Version(), runtime.GOOS, runtime.GOARCH)
+}
+
 func TagsList() []string {
 	tags := strings.Split(Tags, ",")
 	if len(tags) == 1 && tags[0] == "" {

lib/discover/global.go

@@ -25,6 +25,7 @@ import (
 	"golang.org/x/net/http2"
 
 	"github.com/syncthing/syncthing/internal/slogutil"
+	"github.com/syncthing/syncthing/lib/build"
 	"github.com/syncthing/syncthing/lib/connections/registry"
 	"github.com/syncthing/syncthing/lib/dialer"
 	"github.com/syncthing/syncthing/lib/events"
@@ -454,6 +455,7 @@ func (c *contextClient) Get(ctx context.Context, url string) (*http.Response, er
 	if err != nil {
 		return nil, err
 	}
+	req.Header.Set("User-Agent", build.UserAgent())
 	return c.Client.Do(req)
 }
 
@@ -463,6 +465,7 @@ func (c *contextClient) Post(ctx context.Context, url, ctype string, data io.Rea
 		return nil, err
 	}
 	req.Header.Set("Content-Type", ctype)
+	req.Header.Set("User-Agent", build.UserAgent())
 	return c.Client.Do(req)
 }
 

lib/fs/filesystem.go

@@ -295,8 +295,8 @@ func NewFilesystem(fsType FilesystemType, uri string, opts ...Option) Filesystem
 }
 
 // fs cannot import config or versioner, so we hard code .stfolder
-// (config.DefaultMarkerName) and .stversions (versioner.DefaultPath)
-var internals = []string{".stfolder", ".stignore", ".stversions"}
+// (config.DefaultMarkerName) and .stversions (versioner.DefaultPath).
+var internals = []string{".stfolder", ".stversions"}
 
 // IsInternal returns true if the file, as a path relative to the folder
 // root, represents an internal file that should always be ignored. The file

lib/fs/filesystem_test.go

@@ -21,10 +21,8 @@ func TestIsInternal(t *testing.T) {
 		internal bool
 	}{
 		{".stfolder", true},
-		{".stignore", true},
 		{".stversions", true},
 		{".stfolder/foo", true},
-		{".stignore/foo", true},
 		{".stversions/foo", true},
 
 		{".stfolderfoo", false},
@@ -34,6 +32,8 @@ func TestIsInternal(t *testing.T) {
 		{"foo.stignore", false},
 		{"foo.stversions", false},
 		{"foo/.stfolder", false},
+		{".stignore", false},
+		{".stignore/foo", false},
 		{"foo/.stignore", false},
 		{"foo/.stversions", false},
 	}

lib/model/folder_recvonly_test.go

@@ -60,15 +60,15 @@ func TestRecvOnlyRevertDeletes(t *testing.T) {
 
 	must(t, m.ScanFolder("ro"))
 
-	// We should now have two files and two directories, with global state unchanged.
+	// We should now have three files and two directories, with global state unchanged.
 
 	size = mustV(m.GlobalSize("ro"))
 	if size.Files != 1 || size.Directories != 1 {
 		t.Fatalf("Global: expected 1 file and 1 directory: %+v", size)
 	}
 	size = mustV(m.LocalSize("ro", protocol.LocalDeviceID))
-	if size.Files != 2 || size.Directories != 2 {
-		t.Fatalf("Local: expected 2 files and 2 directories: %+v", size)
+	if size.Files != 3 || size.Directories != 2 {
+		t.Fatalf("Local: expected 3 files and 2 directories: %+v", size)
 	}
 	size = mustV(m.ReceiveOnlySize("ro"))
 	if size.Files+size.Directories == 0 {

lib/model/requests_test.go

@@ -974,13 +974,15 @@ func TestIgnoreDeleteUnignore(t *testing.T) {
 	file := "foobar"
 	contents := []byte("test file contents\n")
 
-	basicCheck := func(fs []protocol.FileInfo) {
+	basicCheck := func(fs []protocol.FileInfo) protocol.FileInfo {
 		t.Helper()
-		if len(fs) != 1 {
-			t.Fatal("expected a single index entry, got", len(fs))
-		} else if fs[0].Name != file {
-			t.Fatalf("expected a index entry for %v, got one for %v", file, fs[0].Name)
+		for _, f := range fs {
+			if f.Name == file {
+				return f
+			}
 		}
+		t.Fatalf("expected an index entry for %v, got %v", file, fs)
+		return protocol.FileInfo{}
 	}
 
 	done := make(chan struct{})
@@ -1001,8 +1003,7 @@ func TestIgnoreDeleteUnignore(t *testing.T) {
 
 	done = make(chan struct{})
 	fc.setIndexFn(func(_ context.Context, folder string, fs []protocol.FileInfo) error {
-		basicCheck(fs)
-		f := fs[0]
+		f := basicCheck(fs)
 		if !f.IsInvalid() {
 			t.Errorf("Received non-invalid index update")
 		}
@@ -1022,8 +1023,7 @@ func TestIgnoreDeleteUnignore(t *testing.T) {
 
 	done = make(chan struct{})
 	fc.setIndexFn(func(_ context.Context, folder string, fs []protocol.FileInfo) error {
-		basicCheck(fs)
-		f := fs[0]
+		f := basicCheck(fs)
 		if f.IsInvalid() {
 			t.Errorf("Received invalid index update")
 		}

lib/relay/client/dynamic.go

@@ -14,6 +14,7 @@ import (
 	"sync"
 	"time"
 
+	"github.com/syncthing/syncthing/lib/build"
 	"github.com/syncthing/syncthing/lib/osutil"
 	"github.com/syncthing/syncthing/lib/rand"
 	"github.com/syncthing/syncthing/lib/relay/protocol"
@@ -53,6 +54,7 @@ func (c *dynamicClient) serve(ctx context.Context) error {
 		l.Debugln(c, "failed to lookup dynamic relays", err)
 		return err
 	}
+	req.Header.Set("User-Agent", build.UserAgent())
 	data, err := http.DefaultClient.Do(req)
 	if err != nil {
 		l.Debugln(c, "failed to lookup dynamic relays", err)

lib/scanner/walk_test.go

@@ -40,6 +40,7 @@ type testfile struct {
 type testfileList []testfile
 
 var testdata = testfileList{
+	{".stignore", 48, "f60db5c36f642f8a6c1a636024330cd4dba6ab965083542f3629ff7d8c547911"},
 	{"afile", 4, "b5bb9d8014a0f9b1d61e21e796d78dccdf1352f23cd32812f4850b878ae4944c"},
 	{"dir1", 0, ""},
 	{filepath.Join("dir1", "dfile"), 5, "49ae93732fcf8d63fe1cce759664982dbd5b23161f007dba8561862adc96d063"},

lib/upgrade/upgrade_supported.go

@@ -15,20 +15,19 @@ import (
 	"compress/gzip"
 	"encoding/json"
 	"errors"
-	"fmt"
 	"io"
 	"log/slog"
 	"net/http"
 	"os"
 	"path"
 	"path/filepath"
-	"runtime"
 	"sort"
 	"strings"
 	"time"
 
 	"github.com/shirou/gopsutil/v4/host"
 	"github.com/syncthing/syncthing/internal/slogutil"
+	"github.com/syncthing/syncthing/lib/build"
 	"github.com/syncthing/syncthing/lib/dialer"
 	"github.com/syncthing/syncthing/lib/signature"
 	"github.com/syncthing/syncthing/lib/tlsutil"
@@ -79,13 +78,13 @@ func init() {
 	osVersion = strings.TrimSpace(osVersion)
 }
 
-func upgradeClientGet(url, version string) (*http.Response, error) {
+func upgradeClientGet(url string) (*http.Response, error) {
 	req, err := http.NewRequest(http.MethodGet, url, nil)
 	if err != nil {
 		return nil, err
 	}
 
-	req.Header.Set("User-Agent", fmt.Sprintf(`syncthing %s (%s %s-%s)`, version, runtime.Version(), runtime.GOOS, runtime.GOARCH))
+	req.Header.Set("User-Agent", build.UserAgent())
 	if osVersion != "" {
 		req.Header.Set("Syncthing-Os-Version", osVersion)
 	}
@@ -95,7 +94,7 @@ func upgradeClientGet(url, version string) (*http.Response, error) {
 // FetchLatestReleases returns the latest releases. The "current" parameter
 // is used for setting the User-Agent only.
 func FetchLatestReleases(releasesURL, current string) []Release {
-	resp, err := upgradeClientGet(releasesURL, current)
+	resp, err := upgradeClientGet(releasesURL)
 	if err != nil {
 		slog.Warn("Failed to fetch latest release information", slogutil.Error(err))
 		return nil
@@ -227,6 +226,7 @@ func readRelease(archiveName, dir, url string) (string, error) {
 	}
 
 	req.Header.Add("Accept", "application/octet-stream")
+	req.Header.Set("User-Agent", build.UserAgent())
 	resp, err := upgradeClient.Do(req)
 	if err != nil {
 		return "", err

lib/upnp/upnp.go

@@ -337,7 +337,12 @@ func parseResponse(ctx context.Context, deviceType string, addr *net.UDPAddr, re
 	}
 
 	deviceUUID := strings.TrimPrefix(strings.Split(deviceUSN, "::")[0], "uuid:")
-	response, err = http.Get(deviceDescriptionLocation)
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, deviceDescriptionLocation, nil)
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("User-Agent", build.UserAgent())
+	response, err = http.DefaultClient.Do(req)
 	if err != nil {
 		return nil, err
 	}
@@ -582,7 +587,7 @@ func soapRequestWithIP(ctx context.Context, url, service, function, message stri
 	}
 	req.Close = true
 	req.Header.Set("Content-Type", `text/xml; charset="utf-8"`)
-	req.Header.Set("User-Agent", "syncthing/1.0")
+	req.Header.Set("User-Agent", build.UserAgent())
 	req.Header["SOAPAction"] = []string{fmt.Sprintf(`"%s#%s"`, service, function)} // Enforce capitalization in header-entry for sensitive routers. See issue #1696
 	req.Header.Set("Connection", "Close")
 	req.Header.Set("Cache-Control", "no-cache")

lib/ur/failurereporting.go

@@ -214,6 +214,7 @@ func sendFailureReports(ctx context.Context, reports []contract.FailureReport, u
 		return
 	}
 	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("User-Agent", build.UserAgent())
 
 	resp, err := client.Do(req)
 	if err != nil {

lib/ur/usage_report.go

@@ -373,6 +373,7 @@ func (s *Service) sendUsageReport(ctx context.Context) error {
 		return err
 	}
 	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("User-Agent", build.UserAgent())
 	resp, err := client.Do(req)
 	if err != nil {
 		return err

man/stdiscosrv.1

@@ -27,7 +27,7 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
-.TH "STDISCOSRV" "1" "Aug 03, 2026" "v2.1.0" "Syncthing"
+.TH "STDISCOSRV" "1" "Aug 12, 2026" "v2.1.0" "Syncthing"
 .SH NAME
 stdiscosrv \- Syncthing Discovery Server
 .SH SYNOPSIS

man/strelaysrv.1

@@ -27,7 +27,7 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
-.TH "STRELAYSRV" "1" "Aug 03, 2026" "v2.1.0" "Syncthing"
+.TH "STRELAYSRV" "1" "Aug 12, 2026" "v2.1.0" "Syncthing"
 .SH NAME
 strelaysrv \- Syncthing Relay Server
 .SH SYNOPSIS

man/syncthing-bep.7

@@ -28,7 +28,7 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
-.TH "SYNCTHING-BEP" "7" "Aug 03, 2026" "v2.1.0" "Syncthing"
+.TH "SYNCTHING-BEP" "7" "Aug 12, 2026" "v2.1.0" "Syncthing"
 .SH NAME
 syncthing-bep \- Block Exchange Protocol v1
 .SH INTRODUCTION AND DEFINITIONS

man/syncthing-config.5

@@ -27,7 +27,7 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
-.TH "SYNCTHING-CONFIG" "5" "Aug 03, 2026" "v2.1.0" "Syncthing"
+.TH "SYNCTHING-CONFIG" "5" "Aug 12, 2026" "v2.1.0" "Syncthing"
 .SH NAME
 syncthing-config \- Syncthing Configuration
 .SH OVERVIEW

man/syncthing-device-ids.7

@@ -27,7 +27,7 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
-.TH "SYNCTHING-DEVICE-IDS" "7" "Aug 03, 2026" "v2.1.0" "Syncthing"
+.TH "SYNCTHING-DEVICE-IDS" "7" "Aug 12, 2026" "v2.1.0" "Syncthing"
 .SH NAME
 syncthing-device-ids \- Understanding Device IDs
 .sp

man/syncthing-event-api.7

@@ -27,7 +27,7 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
-.TH "SYNCTHING-EVENT-API" "7" "Aug 03, 2026" "v2.1.0" "Syncthing"
+.TH "SYNCTHING-EVENT-API" "7" "Aug 12, 2026" "v2.1.0" "Syncthing"
 .SH NAME
 syncthing-event-api \- Event API
 .SH DESCRIPTION

man/syncthing-faq.7

@@ -27,7 +27,7 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
-.TH "SYNCTHING-FAQ" "7" "Aug 03, 2026" "v2.1.0" "Syncthing"
+.TH "SYNCTHING-FAQ" "7" "Aug 12, 2026" "v2.1.0" "Syncthing"
 .SH NAME
 syncthing-faq \- Frequently Asked Questions
 .INDENT 0.0

man/syncthing-globaldisco.7

@@ -27,7 +27,7 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
-.TH "SYNCTHING-GLOBALDISCO" "7" "Aug 03, 2026" "v2.1.0" "Syncthing"
+.TH "SYNCTHING-GLOBALDISCO" "7" "Aug 12, 2026" "v2.1.0" "Syncthing"
 .SH NAME
 syncthing-globaldisco \- Global Discovery Protocol v3
 .SH ANNOUNCEMENTS

man/syncthing-localdisco.7

@@ -27,7 +27,7 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
-.TH "SYNCTHING-LOCALDISCO" "7" "Aug 03, 2026" "v2.1.0" "Syncthing"
+.TH "SYNCTHING-LOCALDISCO" "7" "Aug 12, 2026" "v2.1.0" "Syncthing"
 .SH NAME
 syncthing-localdisco \- Local Discovery Protocol v4
 .SH MODE OF OPERATION

man/syncthing-networking.7

@@ -27,7 +27,7 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
-.TH "SYNCTHING-NETWORKING" "7" "Aug 03, 2026" "v2.1.0" "Syncthing"
+.TH "SYNCTHING-NETWORKING" "7" "Aug 12, 2026" "v2.1.0" "Syncthing"
 .SH NAME
 syncthing-networking \- Firewall Setup
 .SH ROUTER SETUP

man/syncthing-relay.7

@@ -28,7 +28,7 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
-.TH "SYNCTHING-RELAY" "7" "Aug 03, 2026" "v2.1.0" "Syncthing"
+.TH "SYNCTHING-RELAY" "7" "Aug 12, 2026" "v2.1.0" "Syncthing"
 .SH NAME
 syncthing-relay \- Relay Protocol v1
 .SH WHAT IS A RELAY?

man/syncthing-rest-api.7

@@ -27,7 +27,7 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
-.TH "SYNCTHING-REST-API" "7" "Aug 03, 2026" "v2.1.0" "Syncthing"
+.TH "SYNCTHING-REST-API" "7" "Aug 12, 2026" "v2.1.0" "Syncthing"
 .SH NAME
 syncthing-rest-api \- REST API
 .sp

man/syncthing-security.7

@@ -27,7 +27,7 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
-.TH "SYNCTHING-SECURITY" "7" "Aug 03, 2026" "v2.1.0" "Syncthing"
+.TH "SYNCTHING-SECURITY" "7" "Aug 12, 2026" "v2.1.0" "Syncthing"
 .SH NAME
 syncthing-security \- Security Principles
 .sp

man/syncthing-stignore.5

@@ -27,7 +27,7 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
-.TH "SYNCTHING-STIGNORE" "5" "Aug 03, 2026" "v2.1.0" "Syncthing"
+.TH "SYNCTHING-STIGNORE" "5" "Aug 12, 2026" "v2.1.0" "Syncthing"
 .SH NAME
 syncthing-stignore \- Prevent files from being synchronized to other nodes
 .SH SYNOPSIS

man/syncthing-versioning.7

@@ -27,7 +27,7 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
-.TH "SYNCTHING-VERSIONING" "7" "Aug 03, 2026" "v2.1.0" "Syncthing"
+.TH "SYNCTHING-VERSIONING" "7" "Aug 12, 2026" "v2.1.0" "Syncthing"
 .SH NAME
 syncthing-versioning \- Keep automatic backups of deleted files by other nodes
 .sp

man/syncthing.1

@@ -27,7 +27,7 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
-.TH "SYNCTHING" "1" "Aug 03, 2026" "v2.1.0" "Syncthing"
+.TH "SYNCTHING" "1" "Aug 12, 2026" "v2.1.0" "Syncthing"
 .SH NAME
 syncthing \- Syncthing
 .SH SYNOPSIS

patches/README.md

@@ -0,0 +1,51 @@
+# Local Syncthing Patches
+
+Apply the local patches manually after pulling a new upstream Syncthing release:
+
+```bash
+git apply patches/sync-stignore.patch patches/webui-build-marker.patch
+go run build.go -build-out bin/syncthing-stignore build syncthing
+```
+
+The automated release flow uses:
+
+```bash
+./scripts/update-custom-release.sh
+```
+
+By default the script finds the latest stable upstream tag, creates a local
+`custom/<version>-<suffix>` branch, applies all local patches, removes upstream
+GitHub/Gitea workflow files from the release commit, tags
+`<upstream>-stignore.7`, regenerates embedded GUI assets, runs focused tests,
+and writes build artifacts to `dist/`.
+
+Useful options:
+
+```bash
+CUSTOM_RELEASE_UPSTREAM_TAG=v2.1.0 ./scripts/update-custom-release.sh
+CUSTOM_RELEASE_FORCE=1 ./scripts/update-custom-release.sh
+CUSTOM_RELEASE_PATCHES="patches/sync-stignore.patch patches/webui-build-marker.patch" ./scripts/update-custom-release.sh
+CUSTOM_RELEASE_PUSH=1 CUSTOM_RELEASE_REMOTE=gitea ./scripts/update-custom-release.sh
+CUSTOM_RELEASE_PUSH=1 CUSTOM_RELEASE_PUSH_BRANCH=1 CUSTOM_RELEASE_REMOTE=gitea ./scripts/update-custom-release.sh
+CUSTOM_RELEASE_CREATE_GITEA_RELEASE=1 CUSTOM_RELEASE_TEA_REPO=felixfoertsch/syncthing ./scripts/update-custom-release.sh
+CUSTOM_RELEASE_BUILDS="darwin/amd64/zip darwin/arm64/zip linux/amd64/tar linux/arm64/tar" ./scripts/update-custom-release.sh
+```
+
+The Gitea and GitHub workflows run the script on their respective CI hosts when
+the local patchset changes on `main`, on a schedule, and on manual dispatch.
+The repository's `upstream` branch stays a clean upstream mirror.
+Before building, each host updates its own `upstream` branch from official
+Syncthing `main` and rebuilds its patched `main` directly on that commit.
+The workflow detects the latest upstream Syncthing stable tag, exits if the
+matching custom tag already exists, pushes only the `<upstream>-stignore.7` tag
+by default, and publishes release assets on the CI host running the workflow.
+The local `custom/<version>` branch is only pushed when
+`CUSTOM_RELEASE_PUSH_BRANCH=1` is set. The workflow builds macOS arm64, Linux
+amd64, and Linux arm64 archives. Both hosts sign their macOS builds with their
+configured Developer ID certificate.
+
+The patch makes root-level `.stignore` sync like regular folder content while
+keeping `.stfolder` and `.stversions` protected as internal Syncthing paths.
+The web UI patch adds `It syncs .stignore now!` to the GUI footer so the custom
+binary is visually distinguishable from upstream builds. The release test fails
+if the generated GUI asset bundle does not contain that marker.

patches/sync-stignore.patch

@@ -0,0 +1,135 @@
+diff --git a/README.md b/README.md
+index 2f5c18f8e..197150ff0 100644
+--- a/README.md
++++ b/README.md
+@@ -1,3 +1,11 @@
++# Syncthing with `.stignore` synchronization
++
++This fork synchronizes the root-level `.stignore` file as regular folder
++content, while keeping `.stfolder` and `.stversions` protected as Syncthing
++internals. The `upstream` branch mirrors the official Syncthing `main` branch;
++this fork's `main` branch and releases apply the `.stignore` synchronization
++patch.
++
+ [![Syncthing][14]][15]
+ 
+ ---
+diff --git a/lib/fs/filesystem.go b/lib/fs/filesystem.go
+index 3800bef9c..8e6ecea2e 100644
+--- a/lib/fs/filesystem.go
++++ b/lib/fs/filesystem.go
+@@ -295,8 +295,8 @@ func NewFilesystem(fsType FilesystemType, uri string, opts ...Option) Filesystem
+ }
+ 
+ // fs cannot import config or versioner, so we hard code .stfolder
+-// (config.DefaultMarkerName) and .stversions (versioner.DefaultPath)
+-var internals = []string{".stfolder", ".stignore", ".stversions"}
++// (config.DefaultMarkerName) and .stversions (versioner.DefaultPath).
++var internals = []string{".stfolder", ".stversions"}
+ 
+ // IsInternal returns true if the file, as a path relative to the folder
+ // root, represents an internal file that should always be ignored. The file
+diff --git a/lib/fs/filesystem_test.go b/lib/fs/filesystem_test.go
+index d8d86dfac..51995499a 100644
+--- a/lib/fs/filesystem_test.go
++++ b/lib/fs/filesystem_test.go
+@@ -21,10 +21,8 @@ func TestIsInternal(t *testing.T) {
+ 		internal bool
+ 	}{
+ 		{".stfolder", true},
+-		{".stignore", true},
+ 		{".stversions", true},
+ 		{".stfolder/foo", true},
+-		{".stignore/foo", true},
+ 		{".stversions/foo", true},
+ 
+ 		{".stfolderfoo", false},
+@@ -34,6 +32,8 @@ func TestIsInternal(t *testing.T) {
+ 		{"foo.stignore", false},
+ 		{"foo.stversions", false},
+ 		{"foo/.stfolder", false},
++		{".stignore", false},
++		{".stignore/foo", false},
+ 		{"foo/.stignore", false},
+ 		{"foo/.stversions", false},
+ 	}
+diff --git a/lib/scanner/walk_test.go b/lib/scanner/walk_test.go
+index 4642a52cc..7226f8ad6 100644
+--- a/lib/scanner/walk_test.go
++++ b/lib/scanner/walk_test.go
+@@ -40,6 +40,7 @@ type testfile struct {
+ type testfileList []testfile
+ 
+ var testdata = testfileList{
++	{".stignore", 48, "f60db5c36f642f8a6c1a636024330cd4dba6ab965083542f3629ff7d8c547911"},
+ 	{"afile", 4, "b5bb9d8014a0f9b1d61e21e796d78dccdf1352f23cd32812f4850b878ae4944c"},
+ 	{"dir1", 0, ""},
+ 	{filepath.Join("dir1", "dfile"), 5, "49ae93732fcf8d63fe1cce759664982dbd5b23161f007dba8561862adc96d063"},
+diff --git a/lib/model/folder_recvonly_test.go b/lib/model/folder_recvonly_test.go
+index e7b37589a..c8cc9209d 100644
+--- a/lib/model/folder_recvonly_test.go
++++ b/lib/model/folder_recvonly_test.go
+@@ -60,15 +60,15 @@ func TestRecvOnlyRevertDeletes(t *testing.T) {
+ 
+ 	must(t, m.ScanFolder("ro"))
+ 
+-	// We should now have two files and two directories, with global state unchanged.
++	// We should now have three files and two directories, with global state unchanged.
+ 
+ 	size = mustV(m.GlobalSize("ro"))
+ 	if size.Files != 1 || size.Directories != 1 {
+ 		t.Fatalf("Global: expected 1 file and 1 directory: %+v", size)
+ 	}
+ 	size = mustV(m.LocalSize("ro", protocol.LocalDeviceID))
+-	if size.Files != 2 || size.Directories != 2 {
+-		t.Fatalf("Local: expected 2 files and 2 directories: %+v", size)
++	if size.Files != 3 || size.Directories != 2 {
++		t.Fatalf("Local: expected 3 files and 2 directories: %+v", size)
+ 	}
+ 	size = mustV(m.ReceiveOnlySize("ro"))
+ 	if size.Files+size.Directories == 0 {
+diff --git a/lib/model/requests_test.go b/lib/model/requests_test.go
+index 72f7ba3d8..6f8124e97 100644
+--- a/lib/model/requests_test.go
++++ b/lib/model/requests_test.go
+@@ -974,13 +974,15 @@ func TestIgnoreDeleteUnignore(t *testing.T) {
+ 	file := "foobar"
+ 	contents := []byte("test file contents\n")
+ 
+-	basicCheck := func(fs []protocol.FileInfo) {
++	basicCheck := func(fs []protocol.FileInfo) protocol.FileInfo {
+ 		t.Helper()
+-		if len(fs) != 1 {
+-			t.Fatal("expected a single index entry, got", len(fs))
+-		} else if fs[0].Name != file {
+-			t.Fatalf("expected a index entry for %v, got one for %v", file, fs[0].Name)
++		for _, f := range fs {
++			if f.Name == file {
++				return f
++			}
+ 		}
++		t.Fatalf("expected an index entry for %v, got %v", file, fs)
++		return protocol.FileInfo{}
+ 	}
+ 
+ 	done := make(chan struct{})
+@@ -1001,8 +1003,7 @@ func TestIgnoreDeleteUnignore(t *testing.T) {
+ 
+ 	done = make(chan struct{})
+ 	fc.setIndexFn(func(_ context.Context, folder string, fs []protocol.FileInfo) error {
+-		basicCheck(fs)
+-		f := fs[0]
++		f := basicCheck(fs)
+ 		if !f.IsInvalid() {
+ 			t.Errorf("Received non-invalid index update")
+ 		}
+@@ -1022,8 +1023,7 @@ func TestIgnoreDeleteUnignore(t *testing.T) {
+ 
+ 	done = make(chan struct{})
+ 	fc.setIndexFn(func(_ context.Context, folder string, fs []protocol.FileInfo) error {
+-		basicCheck(fs)
+-		f := fs[0]
++		f := basicCheck(fs)
+ 		if f.IsInvalid() {
+ 			t.Errorf("Received invalid index update")
+ 		}

patches/webui-build-marker.patch

@@ -0,0 +1,62 @@
+diff --git a/gui/default/index.html b/gui/default/index.html
+index e3e573c9a..5ec76e740 100644
+--- a/gui/default/index.html
++++ b/gui/default/index.html
+@@ -1017,6 +1017,9 @@
+       </div> <!-- /row -->
+ 
+     </div> <!-- /container -->
++    <footer class="container text-center text-muted small" aria-label="Custom build marker">
++      It syncs .stignore now!
++    </footer>
+   </div> <!-- /ng-cloak -->
+ 
+   <ng-include src="'syncthing/core/networkErrorDialogView.html'"></ng-include>
+diff --git a/lib/api/auto/custom_marker_test.go b/lib/api/auto/custom_marker_test.go
+new file mode 100644
+index 000000000..73eae3db7
+--- /dev/null
++++ b/lib/api/auto/custom_marker_test.go
+@@ -0,0 +1,42 @@
++// Copyright (C) 2026 The Syncthing Authors.
++//
++// This Source Code Form is subject to the terms of the Mozilla Public
++// License, v. 2.0. If a copy of the MPL was not distributed with this file,
++// You can obtain one at https://mozilla.org/MPL/2.0/.
++
++package auto
++
++import (
++	"compress/gzip"
++	"io"
++	"strings"
++	"testing"
++)
++
++const customBuildMarker = "It syncs .stignore now!"
++
++func TestCustomBuildMarkerIsEmbedded(t *testing.T) {
++	asset, ok := Assets()["default/index.html"]
++	if !ok {
++		t.Fatal("default/index.html is missing from embedded GUI assets")
++	}
++
++	content := asset.Content
++	if asset.Gzipped {
++		reader, err := gzip.NewReader(strings.NewReader(asset.Content))
++		if err != nil {
++			t.Fatal(err)
++		}
++		defer reader.Close()
++
++		data, err := io.ReadAll(reader)
++		if err != nil {
++			t.Fatal(err)
++		}
++		content = string(data)
++	}
++
++	if !strings.Contains(content, customBuildMarker) {
++		t.Fatalf("embedded GUI assets do not contain custom build marker %q", customBuildMarker)
++	}
++}

scripts/sync-upstream.sh

@@ -0,0 +1,66 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+upstream_url="${SYNC_UPSTREAM_URL:-https://github.com/syncthing/syncthing.git}"
+remote="${SYNC_REMOTE:-origin}"
+upstream_branch="${SYNC_UPSTREAM_BRANCH:-upstream}"
+main_branch="${SYNC_MAIN_BRANCH:-main}"
+tmp=""
+
+die() {
+	printf 'error: %s\n' "$*" >&2
+	exit 1
+}
+
+cleanup() {
+	[[ -z "$tmp" ]] || rm -rf "$tmp"
+}
+
+main() {
+	[[ -z "$(git status --porcelain)" ]] || die "working tree has uncommitted changes"
+
+	local current_main
+	local current_upstream
+	local main_ahead_count
+	local main_parent
+	local new_upstream
+	local upstream_date
+	current_main="$(git rev-parse "refs/heads/$main_branch")"
+	current_upstream="$(git rev-parse "refs/remotes/$remote/$upstream_branch")"
+	main_ahead_count="$(git rev-list --count "$current_upstream..$current_main")"
+	main_parent="$(git rev-parse "$current_main^" 2>/dev/null || true)"
+
+	git fetch "$upstream_url" "refs/heads/main:refs/remotes/official/main"
+	new_upstream="$(git rev-parse refs/remotes/official/main)"
+	if [[ "$new_upstream" == "$current_upstream" && "$main_ahead_count" == "1" && "$main_parent" == "$current_upstream" ]]; then
+		printf 'Upstream is current and main is exactly one commit ahead at %s.\n' "$new_upstream"
+		return
+	fi
+	upstream_date="$(git show -s --format=%cI "$new_upstream")"
+
+	tmp="$(mktemp -d)"
+	trap cleanup EXIT
+	mkdir -p "$tmp/.gitea/workflows" "$tmp/.github/workflows" "$tmp/patches" "$tmp/scripts/tests"
+	cp .gitea/workflows/custom-release.yml "$tmp/.gitea/workflows/"
+	cp .github/workflows/custom-release.yml "$tmp/.github/workflows/"
+	cp patches/*.patch patches/README.md "$tmp/patches/"
+	cp scripts/update-custom-release.sh scripts/sync-upstream.sh "$tmp/scripts/"
+	cp scripts/tests/test-custom-release-macos-runner.bats "$tmp/scripts/tests/"
+
+	if [[ "$new_upstream" != "$current_upstream" ]]; then
+		git branch -f "$upstream_branch" "$new_upstream"
+		git push --force-with-lease="$upstream_branch:$current_upstream" "$remote" "$upstream_branch"
+	fi
+
+	git checkout -B "$main_branch" "$new_upstream"
+	cp -R "$tmp/.gitea" "$tmp/.github" "$tmp/patches" "$tmp/scripts" .
+	git apply patches/sync-stignore.patch patches/webui-build-marker.patch
+	git add -A
+	GIT_AUTHOR_DATE="$upstream_date" GIT_COMMITTER_DATE="$upstream_date" \
+		git -c user.name="Syncthing .stignore Fork" \
+		-c user.email="actions@felixfoertsch.de" \
+		commit -m "apply stignore synchronization patch"
+	git push --force-with-lease="$main_branch:$current_main" "$remote" "$main_branch"
+}
+
+main "$@"

scripts/tests/test-custom-release-macos-runner.bats

@@ -0,0 +1,252 @@
+#!/usr/bin/env bats
+
+setup() {
+	REPO_ROOT="$(git rev-parse --show-toplevel)"
+	WORKFLOW="$REPO_ROOT/.gitea/workflows/custom-release.yml"
+	GITHUB_WORKFLOW="$REPO_ROOT/.github/workflows/custom-release.yml"
+	RELEASE_SCRIPT="$REPO_ROOT/scripts/update-custom-release.sh"
+	SYNC_SCRIPT="$REPO_ROOT/scripts/sync-upstream.sh"
+}
+
+@test "both hosts mirror upstream before building their own release" {
+	run rg -n 'run: ./scripts/sync-upstream.sh' "$WORKFLOW" "$GITHUB_WORKFLOW"
+	[ "$status" -eq 0 ]
+	[ "${#lines[@]}" -eq 2 ]
+
+	run rg -n 'git push --force-with-lease=.*upstream|git push --force-with-lease=.*main' "$SYNC_SCRIPT"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'git apply patches/sync-stignore.patch patches/webui-build-marker.patch' "$SYNC_SCRIPT"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'main_parent=.*current_main\^' "$SYNC_SCRIPT"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'main_parent.*current_upstream' "$SYNC_SCRIPT"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'main_ahead_count=.*rev-list --count' "$SYNC_SCRIPT"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'main_ahead_count.*== "1"' "$SYNC_SCRIPT"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'GIT_AUTHOR_DATE=.*GIT_COMMITTER_DATE=' "$SYNC_SCRIPT"
+	[ "$status" -eq 0 ]
+}
+
+@test "github custom release uses a github macos runner and github releases" {
+	run rg -n 'runs-on:[[:space:]]*macos-14' "$GITHUB_WORKFLOW"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'gh release create' "$GITHUB_WORKFLOW"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'CUSTOM_RELEASE_CREATE_GITEA_RELEASE: "0"' "$GITHUB_WORKFLOW"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'CUSTOM_RELEASE_SIGN_DARWIN: "1"' "$GITHUB_WORKFLOW"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'tea|ffmini_macos_arm64' "$GITHUB_WORKFLOW"
+	[ "$status" -ne 0 ]
+}
+
+@test "github imports signing secrets into a disposable keychain" {
+	run rg -n 'DEVELOPER_ID_APPLICATION_P12_BASE64:.*secrets.DEVELOPER_ID_APPLICATION_P12_BASE64' "$GITHUB_WORKFLOW"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'DEVELOPER_ID_APPLICATION_P12_PASSWORD:.*secrets.DEVELOPER_ID_APPLICATION_P12_PASSWORD' "$GITHUB_WORKFLOW"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'security import .* -P "\$DEVELOPER_ID_APPLICATION_P12_PASSWORD"' "$GITHUB_WORKFLOW"
+	[ "$status" -eq 0 ]
+
+	run rg -n '::add-mask::\$keychain_password' "$GITHUB_WORKFLOW"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'if: always\(\)' "$GITHUB_WORKFLOW"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'security delete-keychain "\$CUSTOM_RELEASE_KEYCHAIN_PATH"' "$GITHUB_WORKFLOW"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'rm -f "\$CUSTOM_RELEASE_CERTIFICATE_PATH"' "$GITHUB_WORKFLOW"
+	[ "$status" -eq 0 ]
+}
+
+@test "custom release runs as one job on ffmini macos runner" {
+	run rg -n 'runs-on:[[:space:]]*ffmini_macos_arm64' "$WORKFLOW"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'ubuntu-latest' "$WORKFLOW"
+	[ "$status" -ne 0 ]
+
+	run rg -n 'actions/upload-artifact' "$WORKFLOW"
+	[ "$status" -ne 0 ]
+}
+
+@test "custom release tea login setup is idempotent on persistent host runner" {
+	run rg -n 'tea" logins delete actions >/dev/null 2>&1 \|\| true' "$WORKFLOW"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'tea" logins add --name actions' "$WORKFLOW"
+	[ "$status" -eq 0 ]
+}
+
+@test "custom release workflow imports developer id signing material into temporary keychain" {
+	run rg -n 'DEVELOPER_ID_APPLICATION_P12_BASE64' "$WORKFLOW"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'DEVELOPER_ID_APPLICATION_P12_PASSWORD' "$WORKFLOW"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'DEVELOPER_ID_APPLICATION_P12_BASE64 secret is required' "$WORKFLOW"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'DEVELOPER_ID_APPLICATION_P12_PASSWORD secret is required' "$WORKFLOW"
+	[ "$status" -ne 0 ]
+
+	run rg -n 'security import .* -P "\$DEVELOPER_ID_APPLICATION_P12_PASSWORD"' "$WORKFLOW"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'security import .* -A ' "$WORKFLOW"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'security find-identity -v -p codesigning "\$keychain_path"' "$WORKFLOW"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'security default-keychain -d user -s "\$keychain_path"' "$WORKFLOW"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'previous_default_keychain=' "$WORKFLOW"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'CUSTOM_RELEASE_PREVIOUS_DEFAULT_KEYCHAIN=\$previous_default_keychain' "$WORKFLOW"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'CUSTOM_RELEASE_PREVIOUS_DYNAMIC_DEFAULT_KEYCHAIN' "$WORKFLOW"
+	[ "$status" -ne 0 ]
+
+	run rg -n 'security default-keychain -s "\$CUSTOM_RELEASE_PREVIOUS_DEFAULT_KEYCHAIN"' "$WORKFLOW"
+	[ "$status" -ne 0 ]
+
+	run rg -n 'security default-keychain -d dynamic' "$WORKFLOW"
+	[ "$status" -ne 0 ]
+
+	run rg -n 'security find-identity -v -p codesigning$' "$WORKFLOW" "$RELEASE_SCRIPT"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'codesign_identity_sha1=' "$WORKFLOW"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'sed -n .*Developer ID Application' "$WORKFLOW"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'CUSTOM_RELEASE_CODESIGN_IDENTITY=\$codesign_identity' "$WORKFLOW"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'CUSTOM_RELEASE_CODESIGN_IDENTITY_SHA1=\$codesign_identity_sha1' "$WORKFLOW"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'CUSTOM_RELEASE_KEYCHAIN_PASSWORD=\$keychain_password' "$WORKFLOW"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'codesign --force --dryrun --sign "\$codesign_identity" --keychain "\$keychain_path" --options runtime --timestamp "\$probe_binary"' "$WORKFLOW"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'CUSTOM_RELEASE_CODESIGN_IDENTITY: "Developer ID Application' "$WORKFLOW"
+	[ "$status" -ne 0 ]
+
+	run rg -n 'security create-keychain' "$WORKFLOW"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'keychain_dir="\$HOME/Library/Keychains"' "$WORKFLOW"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'rm -f "\$keychain_path"' "$WORKFLOW"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'existing_keychains=\(\)' "$WORKFLOW"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'security list-keychains -s "\$keychain_path"' "$WORKFLOW"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'security list-keychains -d dynamic' "$WORKFLOW"
+	[ "$status" -ne 0 ]
+
+	run rg -n 'security import' "$WORKFLOW"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'security delete-keychain' "$WORKFLOW"
+	[ "$status" -eq 0 ]
+}
+
+@test "custom release carries per-target cgo mode" {
+	run rg -n 'darwin/arm64/zip/1' "$WORKFLOW" "$RELEASE_SCRIPT"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'linux/amd64/tar/0' "$WORKFLOW" "$RELEASE_SCRIPT"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'CUSTOM_RELEASE_CGO_ENABLED' "$WORKFLOW"
+	[ "$status" -ne 0 ]
+}
+
+@test "custom release signs darwin assets with hardened runtime and timestamp" {
+	run rg -n 'codesign_args=\(--force --sign "\$codesign_identity"\)' "$RELEASE_SCRIPT"
+	[ "$status" -eq 0 ]
+
+	run rg -n -- '--keychain "\$CUSTOM_RELEASE_KEYCHAIN_PATH"' "$RELEASE_SCRIPT"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'codesign_args\+=\(--options runtime --timestamp\)' "$RELEASE_SCRIPT"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'security unlock-keychain -p "\$CUSTOM_RELEASE_KEYCHAIN_PASSWORD" "\$CUSTOM_RELEASE_KEYCHAIN_PATH"' "$RELEASE_SCRIPT"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'security find-identity -v -p codesigning "\$CUSTOM_RELEASE_KEYCHAIN_PATH"' "$RELEASE_SCRIPT"
+	[ "$status" -eq 0 ]
+
+	run awk '
+		/codesign_args=\(--force --sign "\$codesign_identity"\)/ { sign = NR }
+		/codesign_args\+=\(--keychain "\$CUSTOM_RELEASE_KEYCHAIN_PATH"\)/ { keychain = NR }
+		/codesign_args\+=\(--options runtime --timestamp\)/ { options = NR }
+		END { exit !(sign && keychain && options && sign < keychain && keychain < options) }
+	' "$RELEASE_SCRIPT"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'Developer ID Application' "$WORKFLOW" "$RELEASE_SCRIPT"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'CUSTOM_RELEASE_CODESIGN_IDENTITY' "$WORKFLOW" "$RELEASE_SCRIPT"
+	[ "$status" -eq 0 ]
+}
+
+@test "custom release validates signed darwin binaries before publishing" {
+	run rg -n 'modernc-sqlite' "$RELEASE_SCRIPT"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'codesign --verify --strict --verbose=2' "$RELEASE_SCRIPT"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'TeamIdentifier=NG5W75WE8U|TeamIdentifier.*NG5W75WE8U' "$RELEASE_SCRIPT"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'CUSTOM_RELEASE_REQUIRE_GATEKEEPER_ASSESSMENT: "0"' "$WORKFLOW"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'CUSTOM_RELEASE_SIGN_DARWIN: "1"' "$WORKFLOW"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'require_gatekeeper_assessment="\$\{CUSTOM_RELEASE_REQUIRE_GATEKEEPER_ASSESSMENT:-0\}"' "$RELEASE_SCRIPT"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'if \[\[ "\$require_gatekeeper_assessment" == "1" \]\]; then' "$RELEASE_SCRIPT"
+	[ "$status" -eq 0 ]
+
+	run rg -n 'spctl -a -vv --type execute' "$RELEASE_SCRIPT"
+	[ "$status" -eq 0 ]
+}

scripts/update-custom-release.sh

@@ -0,0 +1,417 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Description: create a patched Syncthing release from the latest upstream tag.
+# Usage: ./scripts/update-custom-release.sh
+
+upstream_url="${CUSTOM_RELEASE_UPSTREAM_URL:-https://github.com/syncthing/syncthing.git}"
+upstream_tag="${CUSTOM_RELEASE_UPSTREAM_TAG:-}"
+suffix="${CUSTOM_RELEASE_SUFFIX:-stignore.7}"
+branch_prefix="${CUSTOM_RELEASE_BRANCH_PREFIX:-custom}"
+dist_dir="${CUSTOM_RELEASE_DIST_DIR:-dist}"
+target="${CUSTOM_RELEASE_TARGET:-syncthing}"
+archive_kind="${CUSTOM_RELEASE_ARCHIVE:-tar}"
+build_specs="${CUSTOM_RELEASE_BUILDS:-}"
+default_cgo_enabled="${CUSTOM_RELEASE_CGO_ENABLED:-0}"
+codesign_identity="${CUSTOM_RELEASE_CODESIGN_IDENTITY:-}"
+codesign_team_id="${CUSTOM_RELEASE_CODESIGN_TEAM_ID:-NG5W75WE8U}"
+sign_darwin="${CUSTOM_RELEASE_SIGN_DARWIN:-1}"
+require_gatekeeper_assessment="${CUSTOM_RELEASE_REQUIRE_GATEKEEPER_ASSESSMENT:-0}"
+push_release="${CUSTOM_RELEASE_PUSH:-0}"
+push_branch="${CUSTOM_RELEASE_PUSH_BRANCH:-0}"
+push_remote="${CUSTOM_RELEASE_REMOTE:-origin}"
+run_tests="${CUSTOM_RELEASE_TEST:-1}"
+force="${CUSTOM_RELEASE_FORCE:-0}"
+publish_gitea_release="${CUSTOM_RELEASE_CREATE_GITEA_RELEASE:-0}"
+tea_repo="${CUSTOM_RELEASE_TEA_REPO:-}"
+patch_tmp_dir=""
+patch_files=()
+assets_rebuilt=0
+
+if [[ -n "${CUSTOM_RELEASE_PATCHES:-}" ]]; then
+	read -r -a patch_files <<< "$CUSTOM_RELEASE_PATCHES"
+elif [[ -n "${CUSTOM_RELEASE_PATCH:-}" ]]; then
+	patch_files=("$CUSTOM_RELEASE_PATCH")
+else
+	patch_files=(
+		patches/sync-stignore.patch
+		patches/webui-build-marker.patch
+	)
+fi
+
+log() {
+	printf '%s\n' "$*"
+}
+
+die() {
+	printf 'error: %s\n' "$*" >&2
+	exit 1
+}
+
+require_clean_worktree() {
+	if [[ -n "$(git status --porcelain)" ]]; then
+		die "working tree has uncommitted changes"
+	fi
+}
+
+latest_stable_tag() {
+	git ls-remote --refs --tags --sort='version:refname' "$upstream_url" 'v[0-9]*' \
+		| awk '{ tag = $2; sub("refs/tags/", "", tag); if (tag ~ /^v[0-9]+\.[0-9]+\.[0-9]+$/) latest = tag } END { print latest }'
+}
+
+tag_exists() {
+	local tag="$1"
+
+	if git rev-parse --quiet --verify "refs/tags/$tag" >/dev/null; then
+		return 0
+	fi
+
+	git ls-remote --quiet --exit-code --tags "$push_remote" "refs/tags/$tag" >/dev/null 2>&1
+}
+
+copy_patches_to_temp() {
+	local patch_tmp_dir="$1"
+	local patch_file
+	local patch_name
+	local patch_index=0
+
+	mkdir -p "$patch_tmp_dir"
+	for patch_file in "${patch_files[@]}"; do
+		[[ -f "$patch_file" ]] || die "patch file not found: $patch_file"
+		printf -v patch_name '%03d-%s' "$patch_index" "$(basename "$patch_file")"
+		cp "$patch_file" "$patch_tmp_dir/$patch_name"
+		patch_index=$((patch_index + 1))
+	done
+}
+
+fetch_upstream_tag() {
+	local tag="$1"
+
+	git fetch --force "$upstream_url" "refs/tags/$tag:refs/tags/$tag"
+}
+
+create_release_commit() {
+	local tag="$1"
+	local custom_tag="$2"
+	local branch="$3"
+	local patch_tmp_dir="$4"
+	local patch_file
+
+	git checkout -B "$branch" "$tag"
+	rm -rf "$dist_dir"
+	for patch_file in "$patch_tmp_dir"/*; do
+		[[ -f "$patch_file" ]] || continue
+		log "Applying $(basename "$patch_file")"
+		git apply --3way "$patch_file"
+	done
+	remove_upstream_workflows
+	git add -A
+	git commit -m "apply local Syncthing patches for $tag"
+	git tag -a "$custom_tag" -m "Syncthing $tag with local patches"
+}
+
+remove_upstream_workflows() {
+	local workflow_dir
+
+	for workflow_dir in .github/workflows .gitea/workflows; do
+		if [[ -e "$workflow_dir" ]]; then
+			log "Removing upstream workflow directory $workflow_dir from release commit"
+			rm -rf "$workflow_dir"
+		fi
+	done
+}
+
+delete_local_tag_if_forced() {
+	local tag="$1"
+
+	if [[ "$force" != "1" ]]; then
+		return
+	fi
+	if git rev-parse --quiet --verify "refs/tags/$tag" >/dev/null; then
+		git tag -d "$tag"
+	fi
+}
+
+test_release() {
+	if [[ "$run_tests" != "1" ]]; then
+		log "Skipping tests because CUSTOM_RELEASE_TEST=$run_tests"
+		return
+	fi
+
+	rebuild_assets_once
+	go test ./lib/api/auto ./lib/fs ./lib/ignore ./lib/scanner ./lib/model
+}
+
+rebuild_assets_once() {
+	if [[ "$assets_rebuilt" == "1" ]]; then
+		return
+	fi
+
+	log "Regenerating embedded GUI assets"
+	go run build.go assets
+	assets_rebuilt=1
+}
+
+format_build_specs() {
+	local spec
+
+	for spec in $build_specs; do
+		printf -- '- %s\n' "$spec"
+	done
+}
+
+build_release() {
+	local custom_tag="$1"
+
+	rebuild_assets_once
+	rm -rf "$dist_dir"
+	mkdir -p "$dist_dir"
+
+	if [[ -z "$build_specs" ]]; then
+		build_specs="$(go env GOOS)/$(go env GOARCH)/$archive_kind"
+	fi
+
+	local spec
+	for spec in $build_specs; do
+		build_one "$custom_tag" "$spec"
+	done
+
+	cat > "$dist_dir/release-notes.md" <<EOF
+# $custom_tag
+
+Syncthing $upstream_tag with the local patches applied.
+
+Builds:
+$(format_build_specs)
+
+Patches:
+$(printf -- '- %s\n' "${patch_files[@]}")
+
+Patch behavior:
+- Root-level .stignore syncs like regular folder content.
+- .stfolder and .stversions stay protected as Syncthing internals.
+- The web GUI footer includes "It syncs .stignore now!" as a custom build marker.
+EOF
+
+	(
+		cd "$dist_dir"
+		if command -v sha256sum >/dev/null 2>&1; then
+			sha256sum ./* > SHA256SUMS
+		else
+			shasum -a 256 ./* > SHA256SUMS
+		fi
+	)
+}
+
+build_one() {
+	local custom_tag="$1"
+	local spec="$2"
+	local goos
+	local goarch
+	local kind
+	local cgo_enabled
+
+	IFS=/ read -r goos goarch kind cgo_enabled <<< "$spec"
+	[[ -n "$goos" && -n "$goarch" && -n "$kind" ]] || die "invalid build spec: $spec"
+	cgo_enabled="${cgo_enabled:-$default_cgo_enabled}"
+
+	log "Building $target for $goos/$goarch as $kind with CGO_ENABLED=$cgo_enabled"
+
+	case "$kind" in
+		tar|zip)
+			local archive
+			archive="$(CGO_ENABLED="$cgo_enabled" go run build.go -version "$custom_tag" -goos "$goos" -goarch "$goarch" "$kind" "$target" | tail -n 1)"
+			if [[ "$goos" == "darwin" && "$sign_darwin" == "1" ]]; then
+				sign_and_validate_darwin_archive "$archive" "$kind"
+			fi
+			mv "$archive" "$dist_dir/"
+			;;
+		binary)
+			CGO_ENABLED="$cgo_enabled" go run build.go -version "$custom_tag" -goos "$goos" -goarch "$goarch" -build-out "$dist_dir/$target-$goos-$goarch" build "$target"
+			if [[ "$goos" == "darwin" && "$sign_darwin" == "1" ]]; then
+				sign_and_validate_darwin_binary "$dist_dir/$target-$goos-$goarch"
+			fi
+			;;
+		*)
+			die "unknown build archive kind in $spec"
+			;;
+	esac
+}
+
+find_release_binary() {
+	local root="$1"
+	local candidate
+
+	while IFS= read -r candidate; do
+		if [[ -x "$candidate" ]]; then
+			printf '%s\n' "$candidate"
+			return
+		fi
+	done < <(find "$root" -type f -name "$target")
+
+	die "could not find executable $target in $root"
+}
+
+sign_and_validate_darwin_archive() {
+	local archive="$1"
+	local kind="$2"
+	local tmp
+	local archive_abs
+	local binary
+
+	[[ -n "$codesign_identity" ]] || die "CUSTOM_RELEASE_CODESIGN_IDENTITY is required for darwin builds"
+
+	tmp="$(mktemp -d)"
+	archive_abs="$(cd "$(dirname "$archive")" && pwd -P)/$(basename "$archive")"
+	case "$kind" in
+		zip)
+			unzip -q "$archive_abs" -d "$tmp"
+			;;
+		tar)
+			tar -xf "$archive_abs" -C "$tmp"
+			;;
+		*)
+			die "cannot sign archive kind $kind"
+			;;
+	esac
+
+	binary="$(find_release_binary "$tmp")"
+	sign_and_validate_darwin_binary "$binary"
+
+	rm -f "$archive_abs"
+	case "$kind" in
+		zip)
+			(
+				cd "$tmp"
+				zip -qr "$archive_abs" .
+			)
+			;;
+		tar)
+			(
+				cd "$tmp"
+				tar -czf "$archive_abs" .
+			)
+			;;
+	esac
+	rm -rf "$tmp"
+}
+
+sign_and_validate_darwin_binary() {
+	local binary="$1"
+	local version_output
+	local codesign_details
+	local codesign_args
+
+	[[ -n "$codesign_identity" ]] || die "CUSTOM_RELEASE_CODESIGN_IDENTITY is required for darwin builds"
+
+	codesign_args=(--force --sign "$codesign_identity")
+	if [[ -n "${CUSTOM_RELEASE_KEYCHAIN_PATH:-}" ]]; then
+		if [[ -n "${CUSTOM_RELEASE_KEYCHAIN_PASSWORD:-}" ]]; then
+			security unlock-keychain -p "$CUSTOM_RELEASE_KEYCHAIN_PASSWORD" "$CUSTOM_RELEASE_KEYCHAIN_PATH"
+		fi
+		security find-identity -v -p codesigning "$CUSTOM_RELEASE_KEYCHAIN_PATH"
+		security find-identity -v -p codesigning
+		codesign_args+=(--keychain "$CUSTOM_RELEASE_KEYCHAIN_PATH")
+	fi
+	codesign_args+=(--options runtime --timestamp)
+	codesign "${codesign_args[@]}" "$binary"
+
+	version_output="$("$binary" --version)"
+	if [[ "$version_output" == *modernc-sqlite* ]]; then
+		die "darwin build unexpectedly reports [modernc-sqlite]: $version_output"
+	fi
+
+	codesign --verify --strict --verbose=2 "$binary"
+	codesign_details="$(codesign -dv --verbose=4 "$binary" 2>&1)"
+	if [[ "$codesign_team_id" == "NG5W75WE8U" && "$codesign_details" != *"TeamIdentifier=NG5W75WE8U"* ]]; then
+		printf '%s\n' "$codesign_details" >&2
+		die "darwin build is not signed by TeamIdentifier=NG5W75WE8U"
+	fi
+	if [[ "$codesign_details" != *"TeamIdentifier=$codesign_team_id"* ]]; then
+		printf '%s\n' "$codesign_details" >&2
+		die "darwin build is not signed by TeamIdentifier=$codesign_team_id"
+	fi
+	if [[ "$require_gatekeeper_assessment" == "1" ]]; then
+		spctl -a -vv --type execute "$binary"
+	else
+		log "Skipping Gatekeeper assessment because CUSTOM_RELEASE_REQUIRE_GATEKEEPER_ASSESSMENT=$require_gatekeeper_assessment"
+	fi
+}
+
+push_refs() {
+	local branch="$1"
+	local custom_tag="$2"
+
+	if [[ "$push_release" != "1" ]]; then
+		log "Skipping push because CUSTOM_RELEASE_PUSH=$push_release"
+		return
+	fi
+
+	if [[ "$push_branch" == "1" ]]; then
+		git push "$push_remote" "$branch"
+	else
+		log "Skipping release branch push because CUSTOM_RELEASE_PUSH_BRANCH=$push_branch"
+	fi
+	git push "$push_remote" "$custom_tag"
+}
+
+publish_release() {
+	local custom_tag="$1"
+
+	if [[ "$publish_gitea_release" != "1" ]]; then
+		log "Skipping Gitea release publishing because CUSTOM_RELEASE_CREATE_GITEA_RELEASE=$publish_gitea_release"
+		return
+	fi
+
+	command -v tea >/dev/null 2>&1 || die "tea is required for Gitea release publishing"
+
+	local args=(releases create "$custom_tag" --title "$custom_tag" --note-file "$dist_dir/release-notes.md")
+	if [[ -n "$tea_repo" ]]; then
+		args+=(--repo "$tea_repo")
+	else
+		args+=(--remote "$push_remote")
+	fi
+
+	local asset
+	for asset in "$dist_dir"/*; do
+		[[ -f "$asset" ]] || continue
+		[[ "$(basename "$asset")" == "release-notes.md" ]] && continue
+		args+=(--asset "$asset")
+	done
+
+	tea "${args[@]}"
+}
+
+main() {
+	require_clean_worktree
+
+	if [[ -z "$upstream_tag" ]]; then
+		upstream_tag="$(latest_stable_tag)"
+	fi
+	[[ -n "$upstream_tag" ]] || die "could not determine latest upstream tag"
+
+	local custom_tag="${upstream_tag}-${suffix}"
+	local branch="${branch_prefix}/${upstream_tag#v}-${suffix}"
+
+	if tag_exists "$custom_tag" && [[ "$force" != "1" ]]; then
+		log "Custom release $custom_tag already exists; nothing to do."
+		return
+	fi
+
+	patch_tmp_dir="$(mktemp -d)"
+	trap 'rm -rf "$patch_tmp_dir"' EXIT
+
+	copy_patches_to_temp "$patch_tmp_dir"
+	fetch_upstream_tag "$upstream_tag"
+	delete_local_tag_if_forced "$custom_tag"
+	create_release_commit "$upstream_tag" "$custom_tag" "$branch" "$patch_tmp_dir"
+	test_release
+	build_release "$custom_tag"
+	push_refs "$branch" "$custom_tag"
+	publish_release "$custom_tag"
+
+	log "Built custom release $custom_tag from upstream $upstream_tag"
+	log "Artifacts are in $dist_dir/"
+}
+
+main "$@"