$ git clone -n https://src.fedoraproject.org/rpms/gstreamer1-plugins-base.git /var/lib/mock/f45-build-13119-446/root/chroot_tmpdir/scmroot/gstreamer1-plugins-base
Cloning into '/var/lib/mock/f45-build-13119-446/root/chroot_tmpdir/scmroot/gstreamer1-plugins-base'...
$ git fetch origin 2144bc20668a15afdec37735cd764404ec630143:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gstreamer1-plugins-base
 * [new ref]         2144bc20668a15afdec37735cd764404ec630143 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2144bc2 1.28.7