$ git clone -n https://src.fedoraproject.org/rpms/alembic.git /var/lib/mock/f42-build-864740-172559/root/chroot_tmpdir/scmroot/alembic
Cloning into '/var/lib/mock/f42-build-864740-172559/root/chroot_tmpdir/scmroot/alembic'...
$ git fetch origin a460ba79034aa67fe1b58b868d107b4b424675f1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/alembic
 * [new ref]         a460ba79034aa67fe1b58b868d107b4b424675f1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a460ba7 Update to 1.8.8 (#2330051)