patchtest: fix failure when oe-core repo is in detached HEAD

Patchtest fails when oe-core git repo is in a "detached HEAD" state:

Error log:

> File "/usr/lib/python3/dist-packages/git/repo/base.py", line 881, in
active_branch return self.head.reference ^^^^^^^^^^^^^^^^^^^

> File "/usr/lib/python3/dist-packages/git/refs/symbolic.py", line 311, in
_get_reference raise TypeError("%s is a detached symbolic reference as it
points to %r" % (self, sha)) TypeError: HEAD is a detached symbolic reference
as it points to '3dd31d3b29730fa1130645d76bb71914ac036335' None

In this case, no current branch is available for the clean operation.

To fix this, updates the checkout logic:
- if a current branch is available, use it,
- otherwise, fall back to the commit pointed to by HEAD.

This ensures that the script works correctly even when HEAD is detached.

(From OE-Core rev: d5fdd34b3f5cdfe313f066bd3447c92a09ce6b53)

Signed-off-by: Naftaly RALAMBOARIVONY <naftaly.ralamboarivony@smile.fr>
Reviewed-by: Yoann Congal <yoann.congal@smile.fr>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 7 insertions, 2 deletions

diff --git a/meta/lib/patchtest/repo.py b/meta/lib/patchtest/repo.py
index 2cdd6736e4..6a7d7d2d3b 100644
--- a/meta/lib/patchtest/repo.py
+++ b/meta/lib/patchtest/repo.py
@@ -21,7 +21,12 @@ class PatchTestRepo(object):
         self.repodir = repodir
         self.repo = git.Repo.init(repodir)
         self.patch = mbox.PatchSeries(patch)
-        self.current_branch = self.repo.active_branch.name
+
+        if self.repo.head.is_detached:
+            self.current_commit = self.repo.head.commit.hexsha
+            self.current_branch = None
+        else:
+            self.current_branch = self.repo.active_branch.name
 
         # targeted branch defined on the patch may be invalid, so make sure there
         # is a corresponding remote branch
@@ -80,6 +85,6 @@ class PatchTestRepo(object):
             self._patchmerged = True
 
     def clean(self):
-        self.repo.git.execute(['git', 'checkout', self.current_branch])
+        self.repo.git.execute(['git', 'checkout', self.current_branch if self.current_branch else self.current_commit])
         self.repo.git.execute(['git', 'branch', '-D', self._workingbranch])
         self._patchmerged = False