mixandCursor
81190a7aad
test / test (push) Has been cancelled
Implement phase 1 and 2 review actions (DMARC UI CSS fixes, bounded DMARC ingest stdin, rate-limit eviction hardening, settings/user handler cleanup, shared atomic/supervisor helpers) and phase 3 documentation/changelog updates including roadmap and accepted-risk notes. Co-authored-by: Cursor <cursoragent@cursor.com>
46 lines
1.1 KiB
Go
46 lines
1.1 KiB
Go
package atomicfile
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import (
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"fmt"
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"os"
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"path/filepath"
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)
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// Write writes data to path via a temp file in the same directory followed by
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// a rename, so readers only ever see the complete old or new file.
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func Write(path string, data []byte, perm os.FileMode) error {
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dir := filepath.Dir(path)
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tmp, err := os.CreateTemp(dir, ".tmp-*")
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if err != nil {
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return fmt.Errorf("create temp in %s: %w", dir, err)
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}
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tmpName := tmp.Name()
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cleanup := true
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defer func() {
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if cleanup {
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_ = os.Remove(tmpName)
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}
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}()
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if _, err := tmp.Write(data); err != nil {
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tmp.Close()
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return fmt.Errorf("write temp %s: %w", tmpName, err)
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}
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if err := tmp.Chmod(perm); err != nil {
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tmp.Close()
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return fmt.Errorf("chmod temp %s: %w", tmpName, err)
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}
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if err := tmp.Sync(); err != nil {
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tmp.Close()
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return fmt.Errorf("sync temp %s: %w", tmpName, err)
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}
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if err := tmp.Close(); err != nil {
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return fmt.Errorf("close temp %s: %w", tmpName, err)
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}
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if err := os.Rename(tmpName, path); err != nil {
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return fmt.Errorf("rename %s -> %s: %w", tmpName, path, err)
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}
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cleanup = false
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return nil
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}
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