$ git clone -n https://src.fedoraproject.org/rpms/zlib-ng.git /var/lib/mock/f41-build-851891-166124/root/chroot_tmpdir/scmroot/zlib-ng
Cloning into '/var/lib/mock/f41-build-851891-166124/root/chroot_tmpdir/scmroot/zlib-ng'...
$ git fetch origin 8a46722e3706f950363ce226993456c0289de2e4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/zlib-ng
 * [new ref]         8a46722e3706f950363ce226993456c0289de2e4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8a46722 Apply a patch that fixes rhbz#2307237