$ git clone -n https://src.fedoraproject.org/rpms/perl-DBD-Pg.git /var/lib/mock/f45-build-22697-593/root/chroot_tmpdir/scmroot/perl-DBD-Pg
Cloning into '/var/lib/mock/f45-build-22697-593/root/chroot_tmpdir/scmroot/perl-DBD-Pg'...
$ git fetch origin 8d6f5277d59eb5c6214c394f3fe9e280ee592ff7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-DBD-Pg
 * [new ref]         8d6f5277d59eb5c6214c394f3fe9e280ee592ff7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8d6f527 3.21.2 bump (rhbz#2524779)