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fix: make saveAliases atomic on Unix by skipping unnecessary unlink before rename

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On Unix/macOS, rename(2) atomically replaces the destination file.
The previous code ran unlinkSync before renameSync on all platforms,
creating an unnecessary non-atomic window where a crash could lose
data. Now the delete-before-rename is gated behind process.platform
=== 'win32', where rename cannot overwrite an existing file.
This commit is contained in:
Affaan Mustafa
2026-02-13 04:23:22 -08:00
parent 0daa5cb070
commit dc11fc2fd8
2 changed files with 29 additions and 2 deletions
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6
scripts/lib/session-aliases.js
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@@ -110,8 +110,10 @@ function saveAliases(aliases) {
// Atomic write: write to temp file, then rename
fs.writeFileSync(tempPath, content, 'utf8');
// On Windows, we need to delete the target file before renaming
if (fs.existsSync(aliasesPath)) {
// On Windows, rename fails with EEXIST if destination exists, so delete first.
// On Unix/macOS, rename(2) atomically replaces the destination — skip the
// delete to avoid an unnecessary non-atomic window between unlink and rename.
if (process.platform === 'win32' && fs.existsSync(aliasesPath)) {
fs.unlinkSync(aliasesPath);
}
fs.renameSync(tempPath, aliasesPath);