$ git clone -n https://src.fedoraproject.org/rpms/libplacebo.git /var/lib/mock/f40-build-786179-134202/root/chroot_tmpdir/scmroot/libplacebo
Cloning into '/var/lib/mock/f40-build-786179-134202/root/chroot_tmpdir/scmroot/libplacebo'...
$ git fetch origin d2089ec214ec22eda6b6b8b3e31e5f38b3623c2a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libplacebo
 * [new ref]         d2089ec214ec22eda6b6b8b3e31e5f38b3623c2a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d2089ec Update to 6.338.2