$ git clone -n https://src.fedoraproject.org/rpms/gstreamer1-plugins-base.git /var/lib/mock/f41-build-812042-147685/root/chroot_tmpdir/scmroot/gstreamer1-plugins-base
Cloning into '/var/lib/mock/f41-build-812042-147685/root/chroot_tmpdir/scmroot/gstreamer1-plugins-base'...
$ git fetch origin f340a642bfc4ebdad400cb89bf11a9dbc7856d9e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gstreamer1-plugins-base
 * [new ref]         f340a642bfc4ebdad400cb89bf11a9dbc7856d9e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f340a64 1.24.4