$ git clone -n https://src.fedoraproject.org/rpms/obs-studio.git /var/lib/mock/f38-build-side-42-init-devel-1250697-30640/root/chroot_tmpdir/scmroot/obs-studio
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1250697-30640/root/chroot_tmpdir/scmroot/obs-studio'...
$ git fetch origin 789e5075dc14ceb34ce26e9da75205e06b78a202:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/obs-studio
 * [new ref]         789e5075dc14ceb34ce26e9da75205e06b78a202 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 789e507 Rebuild (qt6)