$ git clone -n https://src.fedoraproject.org/rpms/rubygem-unf_ext.git /var/lib/mock/f40-build-777979-129681/root/chroot_tmpdir/scmroot/rubygem-unf_ext
Cloning into '/var/lib/mock/f40-build-777979-129681/root/chroot_tmpdir/scmroot/rubygem-unf_ext'...
$ git fetch origin e764e387c5b751f5d9acf3702c6dd9c07a7337a2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-unf_ext
 * [new ref]         e764e387c5b751f5d9acf3702c6dd9c07a7337a2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e764e38 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild