From f9c2b64c9b1cf990702040beb300afc0c9073aee Mon Sep 17 00:00:00 2001
From: no92 <no92.mail@gmail.com>
Date: Fri, 10 Jun 2022 02:03:40 +0200
Subject: [PATCH] checkout: check whether commit exists and warn if it doesn't

---
 xbstrap/base.py | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/xbstrap/base.py b/xbstrap/base.py
index 0f675c7..8ba8aad 100644
--- a/xbstrap/base.py
+++ b/xbstrap/base.py
@@ -2086,6 +2086,18 @@ def checkout_src(cfg, src, settings):
             else:
                 if fixed_commit is not None:
                     commit = fixed_commit
+            missing_commit = False
+            try:
+                subprocess.check_call(
+                    ["git", "cat-file", "-e", commit + "^{commit}"],
+                    cwd=src.source_dir,
+                )
+            except subprocess.CalledProcessError:
+                missing_commit = True
+            if missing_commit:
+                raise RuntimeError(
+                    "git commit '{}' was not found for source '{}'".format(commit, src.name)
+                )
             if init or settings.reset != ResetMode.NONE:
                 subprocess.check_call(
                     ["git", "checkout", "--no-track", "-B", source["branch"], commit],