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lib/fs: Properly handle case insensitive systems (fixes #1787, fixes #2739, fixes #5708)

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With this change we emulate a case sensitive filesystem on top of
insensitive filesystems. This means we correctly pick up case-only renames
and throw a case conflict error when there would be multiple files differing
only in case.

This safety check has a small performance hit (about 20% more filesystem
operations when scanning for changes). The new advanced folder option
`caseSensitiveFS` can be used to disable the safety checks, retaining the
previous behavior on systems known to be fully case sensitive.

Co-authored-by: Jakob Borg <jakob@kastelo.net>
This commit is contained in:
Simon Frei
2020-07-28 11:15:11 +02:00
committed by Jakob Borg
co-authored by Jakob Borg
parent 21dd9d6b43
commit 932d8c69de
27 changed files with 1241 additions and 187 deletions
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lib/model/testutils_test.go
+1 -2
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@@ -36,9 +36,8 @@ func init() {
device1, _ = protocol.DeviceIDFromString("AIR6LPZ-7K4PTTV-UXQSMUU-CPQ5YWH-OEDFIIQ-JUG777G-2YQXXR5-YD6AWQR")
device2, _ = protocol.DeviceIDFromString("GYRZZQB-IRNPV4Z-T7TC52W-EQYJ3TT-FDQW6MW-DFLMU42-SSSU6EM-FBK2VAY")
defaultFs = fs.NewFilesystem(fs.FilesystemTypeBasic, "testdata")
defaultFolderConfig = testFolderConfig("testdata")
defaultFs = defaultFolderConfig.Filesystem()
defaultCfgWrapper = createTmpWrapper(config.New(myID))
_, _ = defaultCfgWrapper.SetDevice(config.NewDeviceConfiguration(device1, "device1"))