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guix environment: Add --ad-hoc option. 

* guix/scripts/environment.scm (%options): Add "ad-hoc" option.
  (show-help): Display help for "--ad-hoc".
  (packages+propagated-inputs): New procedure.
  (guix-environment): Create ad hoc environment when asked.
* doc/guix.texi ("invoking guix environment"): Document it.
This commit is contained in:
David Thompson 2015-05-28 08:41:04 -04:00
parent 1ba4796d13
commit a54bd6d72d
2 changed files with 40 additions and 4 deletions
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17
doc/guix.texi
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@ -2381,7 +2381,7 @@ the @code{#:haddock-flags} parameter. If the file @code{Setup.hs} is
not found, the build system looks for @code{Setup.lhs} instead.
Which Haskell compiler is used can be specified with the @code{#:haskell}
parameter which defaults to @code{ghc}.
parameter which defaults to @code{ghc}.
@end defvr
Lastly, for packages that do not need anything as sophisticated, a
@ -3932,6 +3932,21 @@ evaluates to.
@item -E @var{command}
Execute @var{command} in the new environment.
@item --ad-hoc
Include all specified packages in the resulting environment, as if an
@i{ad hoc} package were defined with them as inputs. This option is
useful for quickly creating an environment without having to write a
package expression to contain the desired inputs.
For instance, the command:
@example
guix environment --ad-hoc guile guile-sdl -E guile
@end example
runs @command{guile} in an environment where Guile and Guile-SDL are
available.
@item --pure
Unset existing environment variables when building the new environment.
This has the effect of creating an environment in which search paths

27
guix/scripts/environment.scm
View File

@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014 David Thompson <davet@gnu.org>
;;; Copyright © 2014, 2015 David Thompson <davet@gnu.org>
;;; Copyright © 2015 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
@ -102,6 +102,9 @@ shell command in that environment.\n"))
FILE evaluates to"))
(display (_ "
-E, --exec=COMMAND execute COMMAND in new environment"))
(display (_ "
--ad-hoc include all specified packages in the environment instead
of only their inputs"))
(display (_ "
--pure unset existing environment variables"))
(display (_ "
@ -147,6 +150,9 @@ shell command in that environment.\n"))
(option '(#\e "expression") #t #f
(lambda (opt name arg result)
(alist-cons 'expression arg result)))
(option '("ad-hoc") #f #f
(lambda (opt name arg result)
(alist-cons 'ad-hoc? #t result)))
(option '(#\n "dry-run") #f #f
(lambda (opt name arg result)
(alist-cons 'dry-run? #t result)))
@ -191,6 +197,18 @@ packages."
(delete-duplicates
(append-map transitive-inputs packages)))
(define (packages+propagated-inputs packages)
"Return a list containing PACKAGES plus all of their propagated inputs."
(delete-duplicates
(append packages
(map (match-lambda
((or (_ (? package? package))
(_ (? package? package) _))
package)
(_ #f))
(append-map package-transitive-propagated-inputs
packages)))))
(define (build-inputs inputs opts)
"Build the packages in INPUTS using the build options in OPTS."
(let ((substitutes? (assoc-ref opts 'substitutes?))
@ -218,9 +236,12 @@ packages."
(let* ((opts (parse-command-line args %options (list %default-options)
#:argument-handler handle-argument))
(pure? (assoc-ref opts 'pure))
(ad-hoc? (assoc-ref opts 'ad-hoc?))
(command (assoc-ref opts 'exec))
(inputs (packages->transitive-inputs
(pick-all (options/resolve-packages opts) 'package)))
(packages (pick-all (options/resolve-packages opts) 'package))
(inputs (if ad-hoc?
(packages+propagated-inputs packages)
(packages->transitive-inputs packages)))
(drvs (run-with-store store
(mbegin %store-monad
(set-guile-for-build (default-guile))