Initial commit

Signed-off-by: Ilan Bigio <ilan@openai.com>

codex-cli/src/utils/check-in-git.ts

@@ -0,0 +1,31 @@
+import { execSync } from "child_process";
+
+/**
+ * Returns true if the given directory is part of a Git repository.
+ *
+ * This uses the canonical Git command `git rev-parse --is-inside-work-tree`
+ * which exits with status 0 when executed anywhere inside a working tree
+ * (including the repo root) and exits with a non‑zero status otherwise. We
+ * intentionally ignore stdout/stderr and only rely on the exit code so that
+ * this works consistently across Git versions and configurations.
+ *
+ * The function is fully synchronous because it is typically used during CLI
+ * startup (e.g. to decide whether to enable certain Git‑specific features) and
+ * a synchronous check keeps such call‑sites simple. The command is extremely
+ * fast (~1ms) so blocking the event‑loop briefly is acceptable.
+ */
+export function checkInGit(workdir: string): boolean {
+  try {
+    // "git rev-parse --is-inside-work-tree" prints either "true" or "false" to
+    // stdout. We don't care about the output — only the exit status — so we
+    // discard stdio for maximum performance and to avoid leaking noise if the
+    // caller happens to inherit stdio.
+    execSync("git rev-parse --is-inside-work-tree", {
+      cwd: workdir,
+      stdio: "ignore",
+    });
+    return true;
+  } catch {
+    return false;
+  }
+}