$ git clone -n https://src.fedoraproject.org/rpms/polly.git /var/lib/mock/f41-build-854741-166952/root/chroot_tmpdir/scmroot/polly
Cloning into '/var/lib/mock/f41-build-854741-166952/root/chroot_tmpdir/scmroot/polly'...
$ git fetch origin 40a097818281c56beefd1280c7ba287e884d57ef:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/polly
 * [new ref]         40a097818281c56beefd1280c7ba287e884d57ef -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 40a0978 Update to 19.1.0