$ git clone -n https://src.fedoraproject.org/rpms/rubygem-rails-html-sanitizer.git /var/lib/mock/f40-build-2034183-47874/root/chroot_tmpdir/scmroot/rubygem-rails-html-sanitizer
Cloning into '/var/lib/mock/f40-build-2034183-47874/root/chroot_tmpdir/scmroot/rubygem-rails-html-sanitizer'...
$ git fetch origin 0866d1b5f70d828cdaefb0efe90047f48d592ec1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-rails-html-sanitizer
 * [new ref]         0866d1b5f70d828cdaefb0efe90047f48d592ec1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0866d1b Fix the wrong BZ ID