$ git clone -n https://src.fedoraproject.org/rpms/contractor.git /var/lib/mock/f39-build-1557839-37301/root/chroot_tmpdir/scmroot/contractor
Cloning into '/var/lib/mock/f39-build-1557839-37301/root/chroot_tmpdir/scmroot/contractor'...
$ git fetch origin c824275efef058d6b0ce48c157895b49d4bbfee6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/contractor
 * [new ref]         c824275efef058d6b0ce48c157895b49d4bbfee6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c824275 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild