$ git clone -n https://src.fedoraproject.org/rpms/rubygem-idn.git /var/lib/mock/f40-build-2639213-66343/root/chroot_tmpdir/scmroot/rubygem-idn
Cloning into '/var/lib/mock/f40-build-2639213-66343/root/chroot_tmpdir/scmroot/rubygem-idn'...
$ git fetch origin 3da59af8cac05ad465968fc71f197561ead32eee:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-idn
 * [new ref]         3da59af8cac05ad465968fc71f197561ead32eee -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3da59af Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild