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moby--moby/builder/internals_linux.go

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