Function deriveCodeSourceId

bin/gstack-gbrain-sync.ts:343–361

* Derive a host- and worktree-aware source id for the cwd code corpus. * * Pattern: `gstack-code- - ` where slug comes from origin * (org/repo) and hostpathhash8 is the first 8 hex chars of * sha1(`${hostname}::${absolute repo path}`). Folding hostname into the hash * keeps C

(repoPath: string)

 * with a hashed-tail fallback when the combined slug exceeds budget.
 */
function deriveCodeSourceId(repoPath: string): string {
  const host = process.env.GSTACK_HOSTNAME || hostname();
  const hostPathHash = createHash("sha1").update(`${host}::${repoPath}`).digest("hex").slice(0, 8);
  const remote = canonicalizeRemote(originUrl());
  if (remote) {
    const segs = remote.split("/").filter(Boolean);
    const slugSource = segs.slice(-2).join("-");
    const fullId = constrainSourceId("gstack-code", `${slugSource}-${hostPathHash}`);
    // If the org+repo+hostpathhash fits cleanly (suffix preserved), use it.
    if (fullId.endsWith(`-${hostPathHash}`)) return fullId;
    // Otherwise drop the org prefix and retry with just repo+hostpathhash so
    // the repo name stays readable. If that still doesn't fit,
    // constrainSourceId falls back to a deterministic hash-only form.
    const repoOnly = segs[segs.length - 1] || "repo";
    return constrainSourceId("gstack-code", `${repoOnly}-${hostPathHash}`);
  }
  const base = repoPath.split("/").pop() || "repo";
  return constrainSourceId("gstack-code", `${base}-${hostPathHash}`);
}

/**
 * Pre-pathhash source id, kept for orphan detection only.