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fs.DeviceID(): Return errors when fi is nil

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This commit is contained in:
Alexander Neumann 2016-11-05 11:52:53 +01:00
parent 6b88d3b5d0
commit c5bc802ff0
1 changed files with 9 additions and 0 deletions
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9
src/restic/fs/deviceid_unix.go
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@ -12,10 +12,19 @@ import (
// DeviceID extracts the device ID from an os.FileInfo object by casting it
// to syscall.Stat_t
func DeviceID(fi os.FileInfo) (deviceID uint64, err error) {
if fi == nil {
return 0, errors.New("unable to determine device: fi is nil")
}
if fi.Sys() == nil {
return 0, errors.New("unable to determine device: fi.Sys() is nil")
}
if st, ok := fi.Sys().(*syscall.Stat_t); ok {
// st.Dev is uint32 on Darwin and uint64 on Linux. Just cast
// everything to uint64.
return uint64(st.Dev), nil
}
return 0, errors.New("Could not cast to syscall.Stat_t")
}