jcoffey-dev
4b0bec8956
GPLv3's "How to Apply These Terms" asks for a notice in each source file; this is the modern two-line SPDX form of it rather than the full paragraph. 82 files, including tests. The blank line after the header is load-bearing. In Go a comment block immediately preceding `package X` becomes the package doc comment, so without the separator the SPDX lines would be absorbed into the doc for the eleven packages whose doc.go (or main.go) opens with one, and `go doc` would print them. Verified it doesn't.
36 lines
1.3 KiB
Go
36 lines
1.3 KiB
Go
// SPDX-FileCopyrightText: 2026 LINUXexpert-org
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// SPDX-License-Identifier: GPL-3.0-or-later
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package backup
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import (
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"fmt"
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"os"
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)
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// PreserveBinary moves the currently-installed binary aside to
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// "<binaryPath>.v<sourceVersion>" so cutover can install the new one at the
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// original path while the exact old binary stays on disk - an operator
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// putting the machine back by hand needs it, and re-downloading a specific
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// old release is not something to be doing under pressure. It never deletes
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// the old binary, and it's idempotent: if a prior attempt at this run
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// already preserved it, calling this again just returns the existing
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// preserved path rather than erroring on a missing source file.
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func PreserveBinary(binaryPath, sourceVersion string) (preservedPath string, err error) {
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if sourceVersion == "" {
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return "", fmt.Errorf("backup: cannot preserve %s without a source version to suffix it with", binaryPath)
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}
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preservedPath = binaryPath + ".v" + sourceVersion
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if _, statErr := os.Stat(preservedPath); statErr == nil {
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return preservedPath, nil
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} else if !os.IsNotExist(statErr) {
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return "", fmt.Errorf("backup: stat %s: %w", preservedPath, statErr)
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}
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if err := os.Rename(binaryPath, preservedPath); err != nil {
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return "", fmt.Errorf("backup: preserve %s as %s: %w", binaryPath, preservedPath, err)
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}
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return preservedPath, nil
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}
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