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* nix-env now maintains meta info (from the `meta' derivation

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attribute) about installed packages in user environments.  Thus, an
  operation like `nix-env -q --description' shows useful information
  not only on available packages but also on installed packages.

* nix-env now passes the entire manifest as an argument to the Nix
  expression of the user environment builder (not just a list of
  paths), so that in particular the user environment builder has
  access to the meta attributes.
  
* New operation `--set-flag' in nix-env to change meta info of
  installed packages.  This will be useful to pass per-package
  policies to the user environment builder (e.g., how to resolve
  collision or whether to disable a package (NIX-80)) or upgrade
  policies in nix-env (e.g., that a package should be "masked", that
  is, left untouched by upgrade actions).  Example:

  $ nix-env --set-flag enabled false ghc-6.4
This commit is contained in:
Eelco Dolstra 2007-02-02 01:52:42 +00:00
parent f52de527c7
commit 451dbf687f
6 changed files with 105 additions and 16 deletions
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10
src/libexpr/get-drvs.cc
View file

@ -60,6 +60,16 @@ MetaInfo DrvInfo::queryMetaInfo(EvalState & state) const
}
void DrvInfo::setMetaInfo(const MetaInfo & meta)
{
ATermMap metaAttrs;
for (MetaInfo::const_iterator i = meta.begin(); i != meta.end(); ++i)
metaAttrs.set(toATerm(i->first),
makeAttrRHS(makeStr(i->second), makeNoPos()));
attrs->set(toATerm("meta"), makeAttrs(metaAttrs));
}
/* Cache for already evaluated derivations. Usually putting ATerms in
a STL container is unsafe (they're not scanning for GC roots), but
here it doesn't matter; everything in this set is reachable from