$ git clone -n https://src.fedoraproject.org/rpms/thunderbird.git /var/lib/mock/f40-build-800086-142754/root/chroot_tmpdir/scmroot/thunderbird
Cloning into '/var/lib/mock/f40-build-800086-142754/root/chroot_tmpdir/scmroot/thunderbird'...
$ git fetch origin f1f41a6dcf524b2ad83d2b3ba44174bc1ad62e6e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/thunderbird
 * [new ref]         f1f41a6dcf524b2ad83d2b3ba44174bc1ad62e6e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f1f41a6 Update to 115.9.0