$ git clone -n https://src.fedoraproject.org/rpms/raptor2.git /var/lib/mock/f42-build-862661-170997/root/chroot_tmpdir/scmroot/raptor2
Cloning into '/var/lib/mock/f42-build-862661-170997/root/chroot_tmpdir/scmroot/raptor2'...
$ git fetch origin b3173ea97f5fc375847e00952f56115834dd563b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/raptor2
 * [new ref]         b3173ea97f5fc375847e00952f56115834dd563b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b3173ea Rebuild for ICU 76