$ git clone -n https://src.fedoraproject.org/rpms/poster.git /var/lib/mock/f41-build-1023987-18174/root/chroot_tmpdir/scmroot/poster
Cloning into '/var/lib/mock/f41-build-1023987-18174/root/chroot_tmpdir/scmroot/poster'...
$ git fetch origin ce32cd99b8e15afd84809f4334cfa7864c71dc15:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/poster
 * [new ref]         ce32cd99b8e15afd84809f4334cfa7864c71dc15 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ce32cd9 Eliminate use of obsolete %patchN syntax (#2283636)