jcoffey-dev
719a945d64
In-place upgrade tool for Stalwart Mail Server (0.15.5 -> latest) with checkpointed rollback and post-migration validation. Design stage; see ARCHITECTURE.md.
26 lines
537 B
Go
26 lines
537 B
Go
package backup
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import (
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"crypto/sha256"
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"encoding/hex"
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"fmt"
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"io"
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"os"
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)
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// hashFile returns a file's SHA256 and size, for recording as a
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// checkpoint.Artifact.
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func hashFile(path string) (sha256Hex string, size int64, err error) {
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f, err := os.Open(path)
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if err != nil {
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return "", 0, fmt.Errorf("backup: hash %s: %w", path, err)
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}
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defer f.Close()
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h := sha256.New()
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n, err := io.Copy(h, f)
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if err != nil {
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return "", 0, fmt.Errorf("backup: hash %s: %w", path, err)
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}
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return hex.EncodeToString(h.Sum(nil)), n, nil
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}
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