40 lines
1.2 KiB
Go
40 lines
1.2 KiB
Go
// +build linux
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package builder
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import (
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"os"
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"path/filepath"
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)
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func fixPermissions(source, destination string, uid, gid int, destExisted bool) error {
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// If the destination didn't already exist, or the destination isn't a
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// directory, then we should Lchown the destination. Otherwise, we shouldn't
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// Lchown the destination.
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destStat, err := os.Stat(destination)
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if err != nil {
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// This should *never* be reached, because the destination must've already
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// been created while untar-ing the context.
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return err
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}
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doChownDestination := !destExisted || !destStat.IsDir()
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// We Walk on the source rather than on the destination because we don't
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// want to change permissions on things we haven't created or modified.
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return filepath.Walk(source, func(fullpath string, info os.FileInfo, err error) error {
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// Do not alter the walk root iff. it existed before, as it doesn't fall under
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// the domain of "things we should chown".
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if !doChownDestination && (source == fullpath) {
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return nil
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}
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// Path is prefixed by source: substitute with destination instead.
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cleaned, err := filepath.Rel(source, fullpath)
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if err != nil {
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return err
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}
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fullpath = filepath.Join(destination, cleaned)
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return os.Lchown(fullpath, uid, gid)
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})
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}
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