$ git clone -n https://src.fedoraproject.org/rpms/rtkit.git /var/lib/mock/f39-build-1622048-38759/root/chroot_tmpdir/scmroot/rtkit
Cloning into '/var/lib/mock/f39-build-1622048-38759/root/chroot_tmpdir/scmroot/rtkit'...
$ git fetch origin 94bd84ee1714911306769a6cef65cbcb03211e9a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rtkit
 * [new ref]         94bd84ee1714911306769a6cef65cbcb03211e9a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 94bd84e Provide a sysusers.d file to get user() and group() provides