$ git clone -n https://src.fedoraproject.org/rpms/gnome-shell-extensions.git /var/lib/mock/f42-build-side-1-3585624-46906/root/chroot_tmpdir/scmroot/gnome-shell-extensions
Cloning into '/var/lib/mock/f42-build-side-1-3585624-46906/root/chroot_tmpdir/scmroot/gnome-shell-extensions'...
$ git fetch origin ae73a5189908f023d8be5c54690c3867b4d104ee:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-shell-extensions
 * [new ref]         ae73a5189908f023d8be5c54690c3867b4d104ee -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ae73a51 Update to 48.3