$ git clone -n https://src.fedoraproject.org/rpms/gstreamer1-vaapi.git /var/lib/mock/f39-build-1540460-36473/root/chroot_tmpdir/scmroot/gstreamer1-vaapi
Cloning into '/var/lib/mock/f39-build-1540460-36473/root/chroot_tmpdir/scmroot/gstreamer1-vaapi'...
$ git fetch origin cb55cff5018695494be08c90ee7f8146789bdb68:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gstreamer1-vaapi
 * [new ref]         cb55cff5018695494be08c90ee7f8146789bdb68 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cb55cff Update to 1.22.6