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fix(discover): parse Codex sessions with large session_meta (>4KB) (#798)

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Merged via PR triage plan. Fixes Codex session discovery for v0.117+ with 15KB+ session_meta. Follow-up: add >128KB regression test.
This commit is contained in:
Diego Sens
2026-04-05 04:09:35 -03:00
committed by GitHub
parent f91ad61a15
commit 1652f224c7
2 changed files with 128 additions and 4 deletions
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11
bin/gstack-global-discover.ts
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@@ -291,7 +291,7 @@ function extractCwdFromJsonl(filePath: string): string | null {
}
function scanCodex(since: Date): Session[] {
const sessionsDir = join(homedir(), ".codex", "sessions");
const sessionsDir = process.env.CODEX_SESSIONS_DIR || join(homedir(), ".codex", "sessions");
if (!existsSync(sessionsDir)) return [];
const sessions: Session[] = [];
@@ -326,11 +326,14 @@ function scanCodex(since: Date): Session[] {
continue;
}
// Read first line for session_meta (only first 4KB)
// Codex session_meta lines embed the full system prompt in
// base_instructions (~15KB as of CLI v0.117+). A 4KB buffer
// truncates the line and JSON.parse fails. 128KB covers current
// sizes with room for growth.
try {
const fd = openSync(filePath, "r");
const buf = Buffer.alloc(4096);
const bytesRead = readSync(fd, buf, 0, 4096, 0);
const buf = Buffer.alloc(131072);
const bytesRead = readSync(fd, buf, 0, 131072, 0);
closeSync(fd);
const firstLine = buf.toString("utf-8", 0, bytesRead).split("\n")[0];
if (!firstLine) continue;