Custom Upgrade Server
=====================

Description
-----------

Syncthing by default upgrades automatically from the `official release packages <https://github.com/syncthing/syncthing/releases>`__
on Github. If this is unsuitable, Syncthing can instead be configured to look
for upgrades on a local or private upgrade server.

.. versionadded:: 0.12.0

Usage
-----

The URL used to fetch release information can be set in :ref:`advanced`, under
the name ``releasesURL``. The URL should point to a location serving a valid
release list. The release list is a JSON file on the following format::

	[
	  {
	    "tag_name": "v0.11.24",
	    "prerelease": false,
	    "assets": [
	      {
	        "url": "https://example.com/dl/syncthing-dragonfly-amd64-v0.11.24.tar.gz",
	        "name": "syncthing-dragonfly-amd64-v0.11.24.tar.gz",
	      },
	      {
	        "url": "https://example.com/dl/syncthing-freebsd-386-v0.11.24.tar.gz",
	        "name": "syncthing-freebsd-386-v0.11.24.tar.gz",
	      },
	      {
	        "url": "https://example.com/dl/syncthing-freebsd-amd64-v0.11.24.tar.gz",
	        "name": "syncthing-freebsd-amd64-v0.11.24.tar.gz",
	      },
	      {
	        "url": "https://example.com/dl/syncthing-linux-386-v0.11.24.tar.gz",
	        "name": "syncthing-linux-386-v0.11.24.tar.gz",
	      },
	      ...
	    ]
	  },
	  {
	    "tag_name": "v0.11.23",
	    "prerelease": false,
	    "assets": [
	      {
	        "url": "https://example.com/dl/syncthing-dragonfly-amd64-v0.11.23.tar.gz",
	        "name": "syncthing-dragonfly-amd64-v0.11.23.tar.gz",
	      },
	      {
	        "url": "https://example.com/dl/syncthing-freebsd-386-v0.11.23.tar.gz",
	        "name": "syncthing-freebsd-386-v0.11.23.tar.gz",
	      },
	      {
	        "url": "https://example.com/dl/syncthing-freebsd-amd64-v0.11.23.tar.gz",
	        "name": "syncthing-freebsd-amd64-v0.11.23.tar.gz",
	      },
	      {
	        "url": "https://example.com/dl/syncthing-linux-386-v0.11.23.tar.gz",
	        "name": "syncthing-linux-386-v0.11.23.tar.gz",
	      },
	      ...
	    ]
	  }
	  ...
	]

The file may include additional attributes; these are ignored. Syncthing looks
for a version number in ``tag_name``, then for an asset ``name`` matching
``syncthing-$os-$arch-$version.$ext``. Only beta releases (i.e. releases with
version numbers of the form ``v0.11.24-beta...``) will consider an upgrade to
a release marked as ``"prerelease": true``. The actual assets must be official
releases downloaded from Github, or they must be custom compiled and signed
according to the process outlined in :ref:`release-signing`.