$ git clone -n https://src.fedoraproject.org/rpms/gstreamer1-plugins-base.git /var/lib/mock/f39-build-1579481-38025/root/chroot_tmpdir/scmroot/gstreamer1-plugins-base
Cloning into '/var/lib/mock/f39-build-1579481-38025/root/chroot_tmpdir/scmroot/gstreamer1-plugins-base'...
$ git fetch origin 86cbc4822cf5a52ecffb5df765b6418eda376a20:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gstreamer1-plugins-base
 * [new ref]         86cbc4822cf5a52ecffb5df765b6418eda376a20 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 86cbc48 Update to 1.22.5