$ git clone -n https://src.fedoraproject.org/rpms/polly.git /var/lib/mock/f40-build-799826-142606/root/chroot_tmpdir/scmroot/polly
Cloning into '/var/lib/mock/f40-build-799826-142606/root/chroot_tmpdir/scmroot/polly'...
$ git fetch origin 5c09023066346fdd222ee0bb9a21c4d572350d70:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/polly
 * [new ref]         5c09023066346fdd222ee0bb9a21c4d572350d70 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5c09023 18.1.0-rc4 Release