$ git clone -n https://src.fedoraproject.org/rpms/libloader.git /var/lib/mock/f39-build-1457854-33019/root/chroot_tmpdir/scmroot/libloader
Cloning into '/var/lib/mock/f39-build-1457854-33019/root/chroot_tmpdir/scmroot/libloader'...
$ git fetch origin a6b54fb4d42b6680fc019ed72acb966c8d848e0b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libloader
 * [new ref]         a6b54fb4d42b6680fc019ed72acb966c8d848e0b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a6b54fb Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild