$ git clone -n https://src.fedoraproject.org/rpms/tkimg.git /var/lib/mock/f42-build-side-1-3517644-46098/root/chroot_tmpdir/scmroot/tkimg
Cloning into '/var/lib/mock/f42-build-side-1-3517644-46098/root/chroot_tmpdir/scmroot/tkimg'...
$ git fetch origin a921d911bbdd6e6adf7bb1f717fb32a8ada3d5c6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tkimg
 * [new ref]         a921d911bbdd6e6adf7bb1f717fb32a8ada3d5c6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a921d91 Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild