$ git clone -n https://src.fedoraproject.org/rpms/obs-studio.git /var/lib/mock/f40-build-771329-125949/root/chroot_tmpdir/scmroot/obs-studio
Cloning into '/var/lib/mock/f40-build-771329-125949/root/chroot_tmpdir/scmroot/obs-studio'...
$ git fetch origin aa444aa6d2f12769d25e539c9bba8ac729ff219d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/obs-studio
 * [new ref]         aa444aa6d2f12769d25e539c9bba8ac729ff219d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at aa444aa Drop broken obsoletes+provides for vlc plugin