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<appendix><title>Bugs / To-Do</title>
<itemizedlist>
<listitem>
<para>
The man-pages generated from the DocBook documentation are ugly.
</para>
</listitem>
<listitem>
<para>
Generations properly form a tree. E.g., if after switching to
generation 39, we perform an installation action, a generation
43 is created which is a descendant of 39, not 42. So a
rollback from 43 ought to go back to 39. This is not
currently implemented; generations form a linear sequence.
</para>
</listitem>
<listitem>
<para>
<emphasis>Build management.</emphasis> In principle it is already
possible to do build management using Nix (by writing builders that
perform appropriate build steps), but the Nix expression language is
not yet powerful enough to make this pleasant (?). The language should
be extended with features from the <ulink
url='http://www.cs.uu.nl/~eelco/maak/'>Maak build manager</ulink>.
Another interesting idea is to write a <command>make</command>
implementation that uses Nix as a back-end to support <ulink
url='http://www.research.att.com/~bs/bs_faq.html#legacy'>legacy</ulink>
build files.
</para>
</listitem>
<listitem><para>For security, <command>nix-push</command> manifests
should be digitally signed, and <command>nix-pull</command> should
verify the signatures. The actual NAR archives in the cache do not
need to be signed, since the manifest contains cryptographic hashes of
these files (and <filename>fetchurl.nix</filename> checks
them).</para></listitem>
<listitem><para>It would be useful to have an option in
<command>nix-env --delete-generations</command> to remove non-current
generations older than a certain age.</para></listitem>
</itemizedlist>
</appendix>
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