$ git clone -n https://src.fedoraproject.org/rpms/mailman3-fedmsg-plugin.git /var/lib/mock/f45-build-17958-506/root/chroot_tmpdir/scmroot/mailman3-fedmsg-plugin
Cloning into '/var/lib/mock/f45-build-17958-506/root/chroot_tmpdir/scmroot/mailman3-fedmsg-plugin'...
$ git fetch origin d200383ab3d2260c51f28ac33dfba5572f886b0d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mailman3-fedmsg-plugin
 * [new ref]         d200383ab3d2260c51f28ac33dfba5572f886b0d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d200383 Unpin the upper bound of python-zope-interface dependency