fuse: add unit-tests for loopback Utimens() #216
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Tests loopbackFileSystem.Utimens() and loopbackfile.Utimens() at 1-second precision. The exising TestUtimesNano() test only works on Linux because it relies on syscall.UtimesNano(), which is not available on Darwin. The new tests call the Utimens() functions directly, bypassing FUSE, and work on all platforms. Because Darwin does not have syscall.UtimesNano(), getting the Utimens() implementation right is hard. The tests currently fail on Darwin, underlining the need for them ( rfjakob/gocryptfs#229 ): $ go test ./fuse/nodefs [...] --- FAIL: TestLoopbackFileUtimens (0.00s) helpers.go:51: mtime has changed: 1525384186 -> 1073 helpers.go:70: atime has changed: 1525291058 -> 1073 [...] $ go test ./fuse/pathfs --- FAIL: TestLoopbackFileSystemUtimens (0.00s) helpers.go:51: mtime has changed: 1525384379 -> 1073 helpers.go:70: atime has changed: 1525291058 -> 1073 [...]
All but the newest MacOS versions (xnu-4570.1.46 / High Sierra) lack utimensat() and UTIME_OMIT, see: https://github.com/apple/darwin-xnu/blame/0a798f6738bc1db01281fc08ae024145e84df927/bsd/sys/stat.h#L537 The UTIME_OMIT value is intepreted literally by MacOS, resulting in all files getting a 1970 timestamp ( rfjakob/gocryptfs#229 ). Emulate UTIME_OMIT by filling in the missing values using an extra GetAttr call. To not duplicate the logic in pathfs and nodefs, an internal "utimens" helper package is created. This patch fixes the failing utimens tests.
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The second commit, b16719c, fixes the problem for good. |
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Thanks for merging! |
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Now with shared test helper.