41 lines
685 B
Go
41 lines
685 B
Go
package installer
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import (
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"io"
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"os"
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"path/filepath"
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)
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func copySelfAtomic(src, dst string, mode os.FileMode) error {
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in, err := os.Open(src)
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if err != nil {
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return err
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}
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defer in.Close()
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if err := os.MkdirAll(filepath.Dir(dst), 0o755); err != nil {
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return err
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}
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tmp := dst + ".tmp"
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out, err := os.OpenFile(tmp, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, mode)
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if err != nil {
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return err
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}
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_, copyErr := io.Copy(out, in)
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closeErr := out.Close()
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if copyErr != nil {
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_ = os.Remove(tmp)
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return copyErr
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}
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if closeErr != nil {
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_ = os.Remove(tmp)
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return closeErr
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}
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if err := os.Rename(tmp, dst); err != nil {
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_ = os.Remove(tmp)
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return err
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}
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return nil
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}
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