$ git clone -n https://src.fedoraproject.org/rpms/nmh.git /var/lib/mock/f40-build-746348-112587/root/chroot_tmpdir/scmroot/nmh
Cloning into '/var/lib/mock/f40-build-746348-112587/root/chroot_tmpdir/scmroot/nmh'...
$ git fetch origin 77e872f0178a5f9db885bdb1d16e0be7e2b8b681:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nmh
 * [new ref]         77e872f0178a5f9db885bdb1d16e0be7e2b8b681 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 77e872f Added Changelog entry for 1.8-3.