$ git clone -n https://src.fedoraproject.org/rpms/obs-studio.git /var/lib/mock/f39-build-1643041-40224/root/chroot_tmpdir/scmroot/obs-studio
Cloning into '/var/lib/mock/f39-build-1643041-40224/root/chroot_tmpdir/scmroot/obs-studio'...
$ git fetch origin 6f0b8faa8470177fbfac9dda35598b94e8fe29a7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/obs-studio
 * [new ref]         6f0b8faa8470177fbfac9dda35598b94e8fe29a7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6f0b8fa Update to 30.0.0~rc2