$ git clone -n https://src.fedoraproject.org/rpms/polly.git /var/lib/mock/f40-build-799725-142583/root/chroot_tmpdir/scmroot/polly
Cloning into '/var/lib/mock/f40-build-799725-142583/root/chroot_tmpdir/scmroot/polly'...
$ git fetch origin 68e04f5bc4f6991bcbcf9a0fd51caff752821456:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/polly
 * [new ref]         68e04f5bc4f6991bcbcf9a0fd51caff752821456 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 68e04f5 18.1.1 Release