Function writeFileFromReader

run.go:552–573

writeFileFromReader writes the contents of r to diskPath, creating parent directories as needed and preserving the executable bit on non-Windows hosts.

(diskPath string, r io.Reader, mode os.FileMode)

// writeFileFromReader writes the contents of r to diskPath, creating parent
// directories as needed and preserving the executable bit on non-Windows hosts.
func writeFileFromReader(diskPath string, r io.Reader, mode os.FileMode) error {
	if err := os.MkdirAll(filepath.Dir(diskPath), 0o777); err != nil {
		return fmt.Errorf("could not create directory: %w", err)
	}
	outFile, err := os.Create(diskPath)
	if err != nil {
		return fmt.Errorf("could not create file: %w", err)
	}
	if _, err := io.Copy(outFile, r); err != nil {
		outFile.Close() //nolint:errcheck
		return fmt.Errorf("could not write file: %w", err)
	}
	if err := outFile.Close(); err != nil {
		return fmt.Errorf("could not close file: %w", err)
	}
	if mode.Perm()&0o100 != 0 && runtime.GOOS != "windows" {
		if err := makeFileExecutable(diskPath); err != nil {
			return err
		}
	}
	return nil
}

// extractTarGzEntry extracts a single named entry from a gzipped tar archive to
// diskPath and marks it executable.