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Handle read only temp files after crash/restart

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This commit is contained in:
Jakob Borg 2014-12-30 14:37:06 +01:00
parent a7694029e2
commit ce4b897d0e
1 changed files with 11 additions and 0 deletions
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11
internal/model/sharedpullerstate.go
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@ -110,6 +110,17 @@ func (s *sharedPullerState) tempFile() (io.WriterAt, error) {
flags := os.O_WRONLY flags := os.O_WRONLY
if s.reused == 0 { if s.reused == 0 {
flags |= os.O_CREATE | os.O_EXCL flags |= os.O_CREATE | os.O_EXCL
} else {
// With sufficiently bad luck when exiting or crashing, we may have
// had time to chmod the temp file to read only state but not yet
// moved it to it's final name. This leaves us with a read only temp
// file that we're going to try to reuse. To handle that, we need to
// make sure we have write permissions on the file before opening it.
err := os.Chmod(s.tempName, 0644)
if err != nil {
s.earlyCloseLocked("dst create chmod", err)
return nil, err
}
} }
fd, err := os.OpenFile(s.tempName, flags, 0644) fd, err := os.OpenFile(s.tempName, flags, 0644)
if err != nil { if err != nil {