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packages: Have `package-derivation' return a <derivation> as a second value.

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* guix/packages.scm (cache): Change the `drv' argument to `thunk'.
  Memoize all the return values of THUNK.
  (cached-derivation): Remove.
  (cached): New macro.
  (package-derivation): Use `cached' instead of `(or (cached-derivation) …)'.
* doc/guix.texi (Defining Packages): Update accordingly.
This commit is contained in:
Ludovic Courtès
2013-01-20 22:17:58 +01:00
parent 079fca3be8
commit e509d1527d
3 changed files with 56 additions and 45 deletions
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doc/guix.texi
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@@ -765,9 +765,8 @@ The build actions it prescribes may then be realized by using the
@code{build-derivations} procedure (@pxref{The Store}).
@deffn {Scheme Procedure} package-derivation @var{store} @var{package} [@var{system}]
Return the derivation of @var{package} for @var{system}. The result is
the file name of the derivation---i.e., a @code{.drv} file under
@code{/nix/store}.
Return the derivation path and corresponding @code{<derivation>} object
of @var{package} for @var{system} (@pxref{Derivations}).
@var{package} must be a valid @code{<package>} object, and @var{system}
must be a string denoting the target system type---e.g.,