$ git clone -n https://src.fedoraproject.org/rpms/rubygem-childprocess.git /var/lib/mock/f38-build-side-42-init-devel-869265-28440/root/chroot_tmpdir/scmroot/rubygem-childprocess
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-869265-28440/root/chroot_tmpdir/scmroot/rubygem-childprocess'...
$ git fetch origin ba9c3448736e2ab038fce6d7e295e4eebd37e830:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-childprocess
 * [new ref]         ba9c3448736e2ab038fce6d7e295e4eebd37e830 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ba9c344 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild