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fix(plan-canvas): inspect startup lock safely

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haelyra
2026-08-28 17:24:19 -04:00
parent 8dd610f574
commit 6ca0540dba
3 changed files with 31 additions and 6 deletions
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scripts/plan-canvas.js
+17 -4
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@@ -187,12 +187,25 @@ function processIsAlive(pid) {
}
}
function readServerStartLock(lockPath) {
let fd;
try {
fd = fs.openSync(lockPath, 'r');
const stat = fs.fstatSync(fd);
let owner = null;
try { owner = JSON.parse(fs.readFileSync(fd, 'utf8')); } catch { /* incomplete lock owner */ }
return { mtimeMs: stat.mtimeMs, owner };
} finally {
if (fd !== undefined) {
try { fs.closeSync(fd); } catch { /* best-effort lock inspection */ }
}
}
}
function removeStaleServerStartLock(lockPath, staleAfterMs = 60 * 1000) {
try {
const stat = fs.statSync(lockPath);
let owner = null;
try { owner = JSON.parse(fs.readFileSync(lockPath, 'utf8')); } catch { /* incomplete lock owner */ }
const oldEnough = Date.now() - stat.mtimeMs > staleAfterMs;
const { mtimeMs, owner } = readServerStartLock(lockPath);
const oldEnough = Date.now() - mtimeMs > staleAfterMs;
if (!oldEnough && (!owner || processIsAlive(owner.pid))) return false;
fs.rmSync(lockPath, { force: true });
return true;