d2cef629fd
* guix/scripts/environment.scm (guix-environment): Return the exit status of the command.
285 lines
12 KiB
Scheme
285 lines
12 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2014, 2015 David Thompson <davet@gnu.org>
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;;; Copyright © 2015 Ludovic Courtès <ludo@gnu.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (guix scripts environment)
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#:use-module (guix ui)
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#:use-module (guix store)
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#:use-module (guix derivations)
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#:use-module (guix packages)
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#:use-module (guix profiles)
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#:use-module (guix search-paths)
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#:use-module (guix utils)
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#:use-module (guix monads)
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#:use-module ((guix gexp) #:select (lower-inputs))
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#:use-module (guix scripts build)
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#:use-module (gnu packages)
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#:use-module (ice-9 format)
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#:use-module (ice-9 match)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-11)
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#:use-module (srfi srfi-26)
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#:use-module (srfi srfi-37)
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#:use-module (srfi srfi-98)
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#:export (guix-environment))
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(define (evaluate-input-search-paths inputs search-paths)
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"Evaluate SEARCH-PATHS, a list of search-path specifications, for the
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directories corresponding to INPUTS, a list of (DERIVATION) or (DERIVATION
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OUTPUT) tuples."
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(let ((directories (map (match-lambda
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(((? derivation? drv))
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(derivation->output-path drv))
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(((? derivation? drv) output)
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(derivation->output-path drv output))
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(((? string? item))
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item))
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inputs)))
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(evaluate-search-paths search-paths directories)))
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;; Protect some env vars from purification. Borrowed from nix-shell.
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(define %precious-variables
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'("HOME" "USER" "LOGNAME" "DISPLAY" "TERM" "TZ" "PAGER"))
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(define (purify-environment)
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"Unset almost all environment variables. A small number of variables such
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as 'HOME' and 'USER' are left untouched."
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(for-each unsetenv
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(remove (cut member <> %precious-variables)
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(match (get-environment-variables)
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(((names . _) ...)
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names)))))
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(define (create-environment inputs paths pure?)
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"Set the environment variables specified by PATHS for all the packages
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within INPUTS. When PURE? is #t, unset the variables in the current
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environment. Otherwise, augment existing enviroment variables with additional
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search paths."
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(when pure? (purify-environment))
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(for-each (match-lambda
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((($ <search-path-specification> variable _ separator) . value)
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(let ((current (getenv variable)))
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(setenv variable
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(if (and current (not pure?))
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(string-append value separator current)
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value)))))
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(evaluate-input-search-paths inputs paths))
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;; Give users a way to know that they're in 'guix environment', so they can
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;; adjust 'PS1' accordingly, for instance.
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(setenv "GUIX_ENVIRONMENT" "t"))
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(define (show-search-paths inputs search-paths pure?)
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"Display SEARCH-PATHS applied to the packages specified by INPUTS, a list of
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(DERIVATION) or (DERIVATION OUTPUT) tuples. When PURE? is #t, do not augment
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existing environment variables with additional search paths."
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(for-each (match-lambda
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((search-path . value)
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(display
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(search-path-definition search-path value
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#:kind (if pure? 'exact 'prefix)))
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(newline)))
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(evaluate-input-search-paths inputs search-paths)))
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(define (package+propagated-inputs package output)
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"Return the union of PACKAGE's OUTPUT and its transitive propagated inputs."
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`((,(package-name package) ,package ,output)
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,@(package-transitive-propagated-inputs package)))
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(define (show-help)
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(display (_ "Usage: guix environment [OPTION]... PACKAGE...
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Build an environment that includes the dependencies of PACKAGE and execute a
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shell command in that environment.\n"))
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(display (_ "
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-e, --expression=EXPR create environment for the package that EXPR
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evaluates to"))
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(display (_ "
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-l, --load=FILE create environment for the package that the code within
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FILE evaluates to"))
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(display (_ "
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-E, --exec=COMMAND execute COMMAND in new environment"))
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(display (_ "
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--ad-hoc include all specified packages in the environment instead
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of only their inputs"))
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(display (_ "
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--pure unset existing environment variables"))
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(display (_ "
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--search-paths display needed environment variable definitions"))
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(display (_ "
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-s, --system=SYSTEM attempt to build for SYSTEM--e.g., \"i686-linux\""))
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(newline)
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(show-build-options-help)
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(newline)
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(display (_ "
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-h, --help display this help and exit"))
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(display (_ "
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-V, --version display version information and exit"))
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(newline)
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(show-bug-report-information))
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(define %default-options
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;; Default to opening a new shell.
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`((exec . ,(or (getenv "SHELL") "/bin/sh"))
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(system . ,(%current-system))
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(substitutes? . #t)
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(max-silent-time . 3600)
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(verbosity . 0)))
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(define %options
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;; Specification of the command-line options.
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(cons* (option '(#\h "help") #f #f
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(lambda args
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(show-help)
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(exit 0)))
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(option '(#\V "version") #f #f
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(lambda args
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(show-version-and-exit "guix environment")))
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(option '("pure") #f #f
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(lambda (opt name arg result)
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(alist-cons 'pure #t result)))
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(option '(#\E "exec") #t #f
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(lambda (opt name arg result)
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(alist-cons 'exec arg result)))
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(option '("search-paths") #f #f
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(lambda (opt name arg result)
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(alist-cons 'search-paths #t result)))
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(option '(#\l "load") #t #f
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(lambda (opt name arg result)
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(alist-cons 'load arg result)))
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(option '(#\e "expression") #t #f
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(lambda (opt name arg result)
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(alist-cons 'expression arg result)))
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(option '("ad-hoc") #f #f
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(lambda (opt name arg result)
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(alist-cons 'ad-hoc? #t result)))
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(option '(#\n "dry-run") #f #f
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(lambda (opt name arg result)
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(alist-cons 'dry-run? #t result)))
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(option '(#\s "system") #t #f
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(lambda (opt name arg result)
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(alist-cons 'system arg
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(alist-delete 'system result eq?))))
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%standard-build-options))
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(define (pick-all alist key)
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"Return a list of values in ALIST associated with KEY."
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(define same-key? (cut eq? key <>))
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(fold (lambda (pair memo)
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(match pair
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(((? same-key? k) . v)
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(cons v memo))
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(_ memo)))
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'() alist))
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(define (options/resolve-packages opts)
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"Return OPTS with package specification strings replaced by actual
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packages."
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(append-map (match-lambda
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(('package . (? string? spec))
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(let-values (((package output)
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(specification->package+output spec)))
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`((package ,package ,output))))
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(('expression . str)
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;; Add all the outputs of the package STR evaluates to.
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(match (read/eval str)
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((? package? package)
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(map (lambda (output)
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`(package ,package ,output))
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(package-outputs package)))))
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(('load . file)
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;; Add all the outputs of the package defined in FILE.
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(let ((package (load* file (make-user-module '()))))
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(map (lambda (output)
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`(package ,package ,output))
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(package-outputs package))))
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(opt (list opt)))
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opts))
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(define (build-inputs inputs opts)
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"Build the derivations in INPUTS, a list of (DERIVATION) or (DERIVATION
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OUTPUT) tuples, using the build options in OPTS."
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(let ((substitutes? (assoc-ref opts 'substitutes?))
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(dry-run? (assoc-ref opts 'dry-run?)))
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(match inputs
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(((derivations _ ...) ...)
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(mbegin %store-monad
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(show-what-to-build* derivations
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#:use-substitutes? substitutes?
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#:dry-run? dry-run?)
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(if dry-run?
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(return #f)
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(mbegin %store-monad
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(set-build-options-from-command-line* opts)
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(built-derivations derivations)
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(return derivations))))))))
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;; Entry point.
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(define (guix-environment . args)
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(define (handle-argument arg result)
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(alist-cons 'package arg result))
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(with-error-handling
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(let* ((opts (parse-command-line args %options (list %default-options)
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#:argument-handler handle-argument))
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(pure? (assoc-ref opts 'pure))
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(ad-hoc? (assoc-ref opts 'ad-hoc?))
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(command (assoc-ref opts 'exec))
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(packages (pick-all (options/resolve-packages opts) 'package))
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(inputs (if ad-hoc?
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(append-map (match-lambda
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((package output)
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(package+propagated-inputs package
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output)))
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packages)
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(append-map (compose bag-transitive-inputs
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package->bag
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first)
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packages)))
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(paths (delete-duplicates
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(cons $PATH
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(append-map (match-lambda
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((label (? package? p) _ ...)
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(package-native-search-paths p))
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(_
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'()))
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inputs))
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eq?)))
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(with-store store
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(run-with-store store
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(mlet %store-monad ((inputs (lower-inputs
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(map (match-lambda
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((label item)
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(list item))
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((label item output)
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(list item output)))
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inputs)
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#:system (assoc-ref opts 'system))))
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(mbegin %store-monad
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;; First build INPUTS. This is necessary even for
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;; --search-paths.
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(build-inputs inputs opts)
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(cond ((assoc-ref opts 'dry-run?)
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(return #t))
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((assoc-ref opts 'search-paths)
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(show-search-paths inputs paths pure?)
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(return #t))
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(else
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(create-environment inputs paths pure?)
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(return (exit (status:exit-val (system command)))))))))))))
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