$ git clone -n https://src.fedoraproject.org/rpms/proguard.git /var/lib/mock/f39-build-1730542-41249/root/chroot_tmpdir/scmroot/proguard
Cloning into '/var/lib/mock/f39-build-1730542-41249/root/chroot_tmpdir/scmroot/proguard'...
$ git fetch origin ff1cff1c733c876af7172e7b9826b38a4bb7e9a4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/proguard
 * [new ref]         ff1cff1c733c876af7172e7b9826b38a4bb7e9a4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ff1cff1 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild