$ git clone -n https://src.fedoraproject.org/rpms/python-signedjson.git /var/lib/mock/f39-build-1444408-32615/root/chroot_tmpdir/scmroot/python-signedjson
Cloning into '/var/lib/mock/f39-build-1444408-32615/root/chroot_tmpdir/scmroot/python-signedjson'...
$ git fetch origin f96f3565781d624e8a7c6f41d34e070927f2ddcc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-signedjson
 * [new ref]         f96f3565781d624e8a7c6f41d34e070927f2ddcc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f96f356 update to 1.1.4