$ git clone -n https://src.fedoraproject.org/rpms/libavif.git /var/lib/mock/f40-build-774015-127559/root/chroot_tmpdir/scmroot/libavif
Cloning into '/var/lib/mock/f40-build-774015-127559/root/chroot_tmpdir/scmroot/libavif'...
$ git fetch origin 51eebc484359cd9053d807847fcc5051b0b984ea:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libavif
 * [new ref]         51eebc484359cd9053d807847fcc5051b0b984ea -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 51eebc4 Rebuild for dav1d 1.3.0