$ git clone -n https://src.fedoraproject.org/rpms/libarcus.git /var/lib/mock/f39-build-1525072-36037/root/chroot_tmpdir/scmroot/libarcus
Cloning into '/var/lib/mock/f39-build-1525072-36037/root/chroot_tmpdir/scmroot/libarcus'...
$ git fetch origin 89f65a45be2455fd27d86448667c7fc1b123e28f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libarcus
 * [new ref]         89f65a45be2455fd27d86448667c7fc1b123e28f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 89f65a4 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild