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Traverse paths in the same order as parent snapshot
This is the 2nd partial fix to #513. The archivepipe requires the snapshot paths and the backup paths to be traversed in the same order, and they were sorted differently: the backup paths by full path, and the snapshot by basename path.
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@ -622,12 +622,21 @@ func unique(items []string) []string {
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return items
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}
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// Snapshots have contents sorted by basename, but we receive full paths.
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// For the archivePipe to advance them in pairs, we traverse the given
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// paths in the same order as the snapshot.
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type BaseNameSlice []string
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func (p BaseNameSlice) Len() int { return len(p) }
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func (p BaseNameSlice) Less(i, j int) bool { return filepath.Base(p[i]) < filepath.Base(p[j]) }
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func (p BaseNameSlice) Swap(i, j int) { p[i], p[j] = p[j], p[i] }
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// Snapshot creates a snapshot of the given paths. If parentID is set, this is
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// used to compare the files to the ones archived at the time this snapshot was
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// taken.
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func (arch *Archiver) Snapshot(p *Progress, paths []string, parentID *backend.ID) (*Snapshot, backend.ID, error) {
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paths = unique(paths)
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sort.Strings(paths)
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sort.Sort(BaseNameSlice(paths))
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debug.Log("Archiver.Snapshot", "start for %v", paths)
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