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* Magic attribute `exportReferencesGraph' that allows the references

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graph to be passed to a builder.  This attribute should be a list of
  pairs [name1 path1 name2 path2 ...].  The references graph of each
  `pathN' will be stored in a text file `nameN' in the temporary build
  directory.  The text files have the format used by `nix-store
  --register-validity'.  However, the deriver fields are left empty.

  `exportReferencesGraph' is useful for builders that want to do
  something with the closure of a store path.  Examples: the builders
  that make initrds and ISO images for NixOS.

  `exportReferencesGraph' is entirely pure.  It's necessary because
  otherwise the only way for a builder to get this information would
  be to call `nix-store' directly, which is not allowed (though
  unfortunately possible).
This commit is contained in:
Eelco Dolstra 2006-11-13 18:18:13 +00:00
parent e40d4a5604
commit e2a70b7ec0
3 changed files with 65 additions and 21 deletions
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6
doc/manual/release-notes.xml
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@ -30,8 +30,12 @@
<listitem><para>TODO: now using Berkeley DB 4.5.</para></listitem>
<listitem><para>Option <option>--reregister</option> in
<listitem><para>TODO: option <option>--reregister</option> in
<command>nix-store --register-validity</command>.</para></listitem>
<listitem><para>TODO: magic <varname>exportReferencesGraph</varname>
attribute.</para></listitem>
</itemizedlist>