$ git clone -n https://src.fedoraproject.org/rpms/nik4.git /var/lib/mock/f40-build-1135519-20569/root/chroot_tmpdir/scmroot/nik4
Cloning into '/var/lib/mock/f40-build-1135519-20569/root/chroot_tmpdir/scmroot/nik4'...
$ git fetch origin dd1414091a3efc29e413cdf98ac8d4334185b4d4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nik4
 * [new ref]         dd1414091a3efc29e413cdf98ac8d4334185b4d4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dd14140 Convert to %autorelease and %autochangelog