$ git clone -n https://src.fedoraproject.org/rpms/libmusicbrainz5.git /var/lib/mock/f45-build-16617-488/root/chroot_tmpdir/scmroot/libmusicbrainz5
Cloning into '/var/lib/mock/f45-build-16617-488/root/chroot_tmpdir/scmroot/libmusicbrainz5'...
$ git fetch origin 6f75ea1332b58187bad0da58d083430fb5e883ee:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libmusicbrainz5
 * [new ref]         6f75ea1332b58187bad0da58d083430fb5e883ee -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6f75ea1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild