$ git clone -n https://src.fedoraproject.org/rpms/mcabber.git /var/lib/mock/f45-build-18159-510/root/chroot_tmpdir/scmroot/mcabber
Cloning into '/var/lib/mock/f45-build-18159-510/root/chroot_tmpdir/scmroot/mcabber'...
$ git fetch origin aafc440ffbc5c7c7b5c4d18fb3ff2d9146fee00b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mcabber
 * [new ref]         aafc440ffbc5c7c7b5c4d18fb3ff2d9146fee00b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at aafc440 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild