$ git clone -n https://src.fedoraproject.org/rpms/libidn.git /var/lib/mock/f40-build-2672354-67502/root/chroot_tmpdir/scmroot/libidn
Cloning into '/var/lib/mock/f40-build-2672354-67502/root/chroot_tmpdir/scmroot/libidn'...
$ git fetch origin 29ad57a93b4764316a5f3761224e97032d3522b7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libidn
 * [new ref]         29ad57a93b4764316a5f3761224e97032d3522b7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 29ad57a Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild