$ git clone -n https://src.fedoraproject.org/rpms/cjs.git /var/lib/mock/f39-build-1724588-41231/root/chroot_tmpdir/scmroot/cjs
Cloning into '/var/lib/mock/f39-build-1724588-41231/root/chroot_tmpdir/scmroot/cjs'...
$ git fetch origin a12738cda9f937f3760603d019c2a7b882a44b53:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cjs
 * [new ref]         a12738cda9f937f3760603d019c2a7b882a44b53 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a12738c Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild