$ git clone -n https://src.fedoraproject.org/rpms/libnxz.git /var/lib/mock/f42-build-3403693-45135/root/chroot_tmpdir/scmroot/libnxz
Cloning into '/var/lib/mock/f42-build-3403693-45135/root/chroot_tmpdir/scmroot/libnxz'...
$ git fetch origin d95250ad555dfc19910c6ab2f6304f19f5814b8f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libnxz
 * [new ref]         d95250ad555dfc19910c6ab2f6304f19f5814b8f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d95250a Add sysusers.d config file to allow rpm to create users/groups automatically