$ git clone -n https://src.fedoraproject.org/rpms/libsixel.git /var/lib/mock/f40-build-2278747-55281/root/chroot_tmpdir/scmroot/libsixel
Cloning into '/var/lib/mock/f40-build-2278747-55281/root/chroot_tmpdir/scmroot/libsixel'...
$ git fetch origin e7bd49d5df3b8b49ded6699db681fb3a8cd7d003:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libsixel
 * [new ref]         e7bd49d5df3b8b49ded6699db681fb3a8cd7d003 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e7bd49d Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild