$ git clone -n https://src.fedoraproject.org/rpms/libloc.git /var/lib/mock/f43-perl-60961527-6586810/root/chroot_tmpdir/scmroot/libloc
Cloning into '/var/lib/mock/f43-perl-60961527-6586810/root/chroot_tmpdir/scmroot/libloc'...
$ git fetch origin 3059c1a08ad6fd09d31c977aa66e67940a418a9f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libloc
 * [new ref]         3059c1a08ad6fd09d31c977aa66e67940a418a9f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3059c1a Perl 5.42 rebuild