$ git clone -n https://src.fedoraproject.org/rpms/gnome-extensions-app.git /var/lib/mock/f41-build-850567-165462/root/chroot_tmpdir/scmroot/gnome-extensions-app
Cloning into '/var/lib/mock/f41-build-850567-165462/root/chroot_tmpdir/scmroot/gnome-extensions-app'...
$ git fetch origin cf34d96282c2e5089a5ace2c67e26cc0cde1d667:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-extensions-app
 * [new ref]         cf34d96282c2e5089a5ace2c67e26cc0cde1d667 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cf34d96 Update to 47.0