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moby--moby/utils/tmpdir.go

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package utils
import (
"os"
"path/filepath"
)
// TempDir returns the default directory to use for temporary files.
func TempDir(rootDir string) (string, error) {
var tmpDir string
if tmpDir = os.Getenv("DOCKER_TMPDIR"); tmpDir == "" {
tmpDir = filepath.Join(rootDir, "tmp")
}
err := os.MkdirAll(tmpDir, 0700)
return tmpDir, err
}