$ git clone -n https://src.fedoraproject.org/rpms/obs-studio.git /var/lib/mock/f39-build-1671918-40868/root/chroot_tmpdir/scmroot/obs-studio
Cloning into '/var/lib/mock/f39-build-1671918-40868/root/chroot_tmpdir/scmroot/obs-studio'...
$ git fetch origin 8e967dd78b6cfe69f3d5e4071e8aeb8024fedd45:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/obs-studio
 * [new ref]         8e967dd78b6cfe69f3d5e4071e8aeb8024fedd45 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8e967dd Update to 30.0.0 final