$ git clone -n https://src.fedoraproject.org/rpms/jsonnet.git /var/lib/mock/f40-build-734296-105825/root/chroot_tmpdir/scmroot/jsonnet
Cloning into '/var/lib/mock/f40-build-734296-105825/root/chroot_tmpdir/scmroot/jsonnet'...
$ git fetch origin b46f04f3f8629bc796505ffcc299fd6d4e88011a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jsonnet
 * [new ref]         b46f04f3f8629bc796505ffcc299fd6d4e88011a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b46f04f Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild