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fix(code-mode): use System32 bsdtar to extract engines on Windows (#626)

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Enabling Claude/Codex in Settings -> Code Mode failed on Windows with
"tar (child): Cannot connect to C: resolve failed / gzip: stdin:
unexpected end of file". PATH `tar` resolves to a GNU tar (Git/MSYS2)
that misreads the absolute archive path "C:\...\engine.tgz" as a remote
host:path spec.

Pin extraction to the bsdtar shipped in System32, which handles
drive-letter paths natively, with a relative-path fallback if it is
absent. macOS/Linux behavior is unchanged.
This commit is contained in:
gagan 2026-06-17 13:33:21 -07:00 • committed by GitHub
parent 79162ebc69
commit 3fe7f307ab
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1 changed files with 23 additions and 1 deletions
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24
apps/x/packages/core/src/code-mode/acp/engine-provisioner.ts
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@ -189,7 +189,29 @@ function verifyIntegrity(file: string, integrity: string): void {
// contents land directly in destDir. Uses the system tar (bsdtar on macOS/Windows 10+,
// GNU tar on Linux) — all support -xzf and --strip-components.
function extractTarball(tarPath: string, destDir: string): void {
const r = spawnSync('tar', ['-xzf', tarPath, '-C', destDir, '--strip-components=1'], { stdio: 'pipe' });
let tarCmd = 'tar';
let tarArgs = ['-xzf', tarPath, '-C', destDir, '--strip-components=1'];
let spawnOpts: Parameters<typeof spawnSync>[2] = { stdio: 'pipe' };
// Windows: PATH `tar` may resolve to a GNU tar from Git/MSYS2, which misreads the
// absolute archive path "C:\...\engine.tgz" as a remote "host:path" spec and fails with
// "tar (child): Cannot connect to C: resolve failed" (then "gzip: stdin: unexpected end
// of file"). Pin to the bsdtar shipped in System32, which handles drive-letter paths
// natively — this is the tar this code was always meant to use on Windows 10+.
if (process.platform === 'win32') {
const sysTar = path.join(process.env.SystemRoot || 'C:\\Windows', 'System32', 'tar.exe');
if (fs.existsSync(sysTar)) {
tarCmd = sysTar;
} else {
// No system bsdtar (very old/stripped Windows): fall back to PATH tar, but run
// from the archive's own directory and pass the bare filename so no drive-letter
// colon reaches tar's -f argument — works for both GNU tar and bsdtar.
tarArgs = ['-xzf', path.basename(tarPath), '-C', destDir, '--strip-components=1'];
spawnOpts = { stdio: 'pipe', cwd: path.dirname(tarPath) };
}
}
const r = spawnSync(tarCmd, tarArgs, spawnOpts);
if (r.status !== 0) {
const err = r.stderr?.toString().trim() || r.error?.message || `tar exited ${r.status}`;
throw new Error(`Code mode: failed to extract engine — ${err}`);