$ git clone -n https://src.fedoraproject.org/rpms/json_simple.git /var/lib/mock/f40-build-2494699-61664/root/chroot_tmpdir/scmroot/json_simple
Cloning into '/var/lib/mock/f40-build-2494699-61664/root/chroot_tmpdir/scmroot/json_simple'...
$ git fetch origin b1f44cd02dbe320973f75fbe7649d3e63db8fd2b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/json_simple
 * [new ref]         b1f44cd02dbe320973f75fbe7649d3e63db8fd2b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b1f44cd Rebuilt for java-21-openjdk as system jdk