$ git clone -n https://src.fedoraproject.org/rpms/perl-Messaging-Message.git /var/lib/mock/f42-build-3181716-40950/root/chroot_tmpdir/scmroot/perl-Messaging-Message
Cloning into '/var/lib/mock/f42-build-3181716-40950/root/chroot_tmpdir/scmroot/perl-Messaging-Message'...
$ git fetch origin b0674d7637b979b792c810676925fde6eff8c20d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Messaging-Message
 * [new ref]         b0674d7637b979b792c810676925fde6eff8c20d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b0674d7 Orphaned for 6+ weeks