$ git clone -n https://src.fedoraproject.org/rpms/unar.git /var/lib/mock/f45-build-37687-717/root/chroot_tmpdir/scmroot/unar
Cloning into '/var/lib/mock/f45-build-37687-717/root/chroot_tmpdir/scmroot/unar'...
$ git fetch origin 1b11edf46ea42fb1a7cfb88b057723e37bca2640:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/unar
 * [new ref]         1b11edf46ea42fb1a7cfb88b057723e37bca2640 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1b11edf Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild