$ git clone -n https://src.fedoraproject.org/rpms/rubygem-idn.git /var/lib/mock/f40-build-733967-105612/root/chroot_tmpdir/scmroot/rubygem-idn
Cloning into '/var/lib/mock/f40-build-733967-105612/root/chroot_tmpdir/scmroot/rubygem-idn'...
$ git fetch origin 88e98e1cedf48bfdcfc0f3f7b7a66fe67c1ff71a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-idn
 * [new ref]         88e98e1cedf48bfdcfc0f3f7b7a66fe67c1ff71a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 88e98e1 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild