612 lines
26 KiB
Scheme
612 lines
26 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, 2016 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 grafts)
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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 build 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)
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#:use-module (guix scripts build)
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#:use-module (gnu build linux-container)
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#:use-module (gnu system linux-container)
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#:use-module (gnu system file-systems)
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#:use-module (gnu packages)
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#:use-module (gnu packages bash)
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#:use-module (gnu packages commencement)
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#:use-module (gnu packages guile)
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#:use-module ((gnu packages bootstrap) #:select (%bootstrap-guile))
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#:use-module (ice-9 format)
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#:use-module (ice-9 match)
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#:use-module (ice-9 rdelim)
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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-profile-search-paths profile search-paths)
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"Evaluate SEARCH-PATHS, a list of search-path specifications, for the
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directories in PROFILE, the store path of a profile."
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(evaluate-search-paths search-paths (list profile)))
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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 %default-shell
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(or (getenv "SHELL") "/bin/sh"))
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(define %network-configuration-files
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'("/etc/resolv.conf"
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"/etc/nsswitch.conf"
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"/etc/services"
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"/etc/hosts"))
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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 profile paths pure?)
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"Set the environment variables specified by PATHS for PROFILE. When PURE?
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is #t, unset the variables in the current environment. Otherwise, augment
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existing enviroment variables with additional 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-profile-search-paths profile 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 profile search-paths pure?)
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"Display SEARCH-PATHS applied to PROFILE. 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-profile-search-paths profile search-paths)))
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(define (strip-input-name input)
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"Remove the name element from the tuple INPUT."
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(match input
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((_ package) package)
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((_ package output)
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(list package output))))
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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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(cons (list package output)
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(map strip-input-name
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(package-transitive-propagated-inputs package))))
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(define (package-or-package+output? expr)
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"Return #t if EXPR is a package or a 2 element list consisting of a package
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and an output string."
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(match expr
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((or (? package?) ; bare package object
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((? package?) (? string?))) ; package+output tuple
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#t)
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(_ #f)))
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(define (package-environment-inputs package)
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"Return a list of the transitive input packages for PACKAGE."
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;; Remove non-package inputs such as origin records.
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(filter package-or-package+output?
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(map strip-input-name
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(bag-transitive-inputs
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(package->bag package)))))
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(define (show-help)
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(display (_ "Usage: guix environment [OPTION]... PACKAGE... [-- COMMAND...]
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Build an environment that includes the dependencies of PACKAGE and execute
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COMMAND or an interactive shell 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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--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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(display (_ "
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-C, --container run command within an isolated container"))
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(display (_ "
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-N, --network allow containers to access the network"))
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(display (_ "
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--share=SPEC for containers, share writable host file system
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according to SPEC"))
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(display (_ "
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--expose=SPEC for containers, expose read-only host file system
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according to SPEC"))
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(display (_ "
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--bootstrap use bootstrap binaries to build the environment"))
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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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`((system . ,(%current-system))
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(substitutes? . #t)
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(graft? . #t)
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(max-silent-time . 3600)
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(verbosity . 0)))
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(define (tag-package-arg opts arg)
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"Return a two-element list with the form (TAG ARG) that tags ARG with either
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'ad-hoc' in OPTS has the 'ad-hoc?' key set to #t, or 'inputs' otherwise."
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;; Normally, the transitive inputs to a package are added to an environment,
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;; but the ad-hoc? flag changes the meaning of a package argument such that
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;; the package itself is added to the environment instead.
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(if (assoc-ref opts 'ad-hoc?)
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`(ad-hoc-package ,arg)
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`(package ,arg)))
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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 ; deprecated
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(lambda (opt name arg result)
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(alist-cons 'exec (list %default-shell "-c" 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
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(tag-package-arg result arg)
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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
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(tag-package-arg result arg)
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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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(option '(#\C "container") #f #f
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(lambda (opt name arg result)
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(alist-cons 'container? #t result)))
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(option '(#\N "network") #f #f
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(lambda (opt name arg result)
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(alist-cons 'network? #t result)))
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(option '("share") #t #f
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(lambda (opt name arg result)
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(alist-cons 'file-system-mapping
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(specification->file-system-mapping arg #t)
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result)))
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(option '("expose") #t #f
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(lambda (opt name arg result)
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(alist-cons 'file-system-mapping
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(specification->file-system-mapping arg #f)
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result)))
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(option '("bootstrap") #f #f
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(lambda (opt name arg result)
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(alist-cons 'bootstrap? #t result)))
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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 (compact lst)
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"Remove all #f elements from LST."
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(filter identity lst))
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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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(define (package->output package mode)
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(match package
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((? package?)
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(list mode package "out"))
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(((? package? package) (? string? output))
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(list mode package output))))
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(define (packages->outputs packages mode)
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(match packages
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((? package-or-package+output? package) ; single package
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(list (package->output package mode)))
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(((? package-or-package+output?) ...) ; many packages
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(map (cut package->output <> mode) packages))))
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(compact
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(append-map (match-lambda
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(('package mode (? string? spec))
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(let-values (((package output)
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(specification->package+output spec)))
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(list (list mode package output))))
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(('expression mode str)
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;; Add all the outputs of the package STR evaluates to.
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(packages->outputs (read/eval str) mode))
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(('load mode file)
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;; Add all the outputs of the package defined in FILE.
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(let ((module (make-user-module '())))
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(packages->outputs (load* file module) mode)))
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(_ '(#f)))
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opts)))
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(define* (build-environment derivations opts)
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"Build the DERIVATIONS required by the environment using the build options
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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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(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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(define (inputs->profile-derivation inputs system bootstrap?)
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"Return the derivation for a profile consisting of INPUTS for SYSTEM.
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BOOTSTRAP? specifies whether to use the bootstrap Guile to build the
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profile."
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(profile-derivation (packages->manifest inputs)
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#:system system
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#:hooks (if bootstrap?
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'()
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%default-profile-hooks)))
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(define requisites* (store-lift requisites))
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(define (inputs->requisites inputs)
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"Convert INPUTS, a list of input tuples or store path strings, into a set of
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requisite store items i.e. the union closure of all the inputs."
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(define (input->requisites input)
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(requisites*
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(match input
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((drv output)
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(derivation->output-path drv output))
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((drv)
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(derivation->output-path drv))
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((? direct-store-path? path)
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path))))
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(mlet %store-monad ((reqs (sequence %store-monad
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(map input->requisites inputs))))
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(return (delete-duplicates (concatenate reqs)))))
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(define (status->exit-code status)
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"Compute the exit code made from STATUS, a value as returned by 'waitpid',
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and suitable for 'exit'."
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;; See <bits/waitstatus.h>.
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(or (status:exit-val status)
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(logior #x80 (status:term-sig status))))
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(define exit/status (compose exit status->exit-code))
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(define primitive-exit/status (compose primitive-exit status->exit-code))
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(define (launch-environment command inputs paths pure?)
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"Run COMMAND in a new environment containing INPUTS, using the native search
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paths defined by the list PATHS. When PURE?, pre-existing environment
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variables are cleared before setting the new ones."
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;; Properly handle SIGINT, so pressing C-c in an interactive terminal
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;; application works.
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(sigaction SIGINT SIG_DFL)
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(create-environment inputs paths pure?)
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(match command
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((program . args)
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(apply execlp program program args))))
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(define (launch-environment/fork command inputs paths pure?)
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"Run COMMAND in a new process with an environment containing INPUTS, using
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the native search paths defined by the list PATHS. When PURE?, pre-existing
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environment variables are cleared before setting the new ones."
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(match (primitive-fork)
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(0 (launch-environment command inputs paths pure?))
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(pid (match (waitpid pid)
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((_ . status) status)))))
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(define* (launch-environment/container #:key command bash user-mappings
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profile paths network?)
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"Run COMMAND within a container that features the software in PROFILE.
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Environment variables are set according to PATHS, a list of native search
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paths. The global shell is BASH, a file name for a GNU Bash binary in the
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store. When NETWORK?, access to the host system network is permitted.
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USER-MAPPINGS, a list of file system mappings, contains the user-specified
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host file systems to mount inside the container."
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(mlet %store-monad ((reqs (inputs->requisites
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(list (direct-store-path bash) profile))))
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(return
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(let* ((cwd (getcwd))
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(passwd (getpwuid (getuid)))
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;; Bind-mount all requisite store items, user-specified mappings,
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;; /bin/sh, the current working directory, and possibly networking
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;; configuration files within the container.
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(mappings
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(append user-mappings
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;; Current working directory.
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(list (file-system-mapping
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(source cwd)
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(target cwd)
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(writable? #t)))
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;; When in Rome, do as Nix build.cc does: Automagically
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;; map common network configuration files.
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(if network?
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(filter-map (lambda (file)
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(and (file-exists? file)
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(file-system-mapping
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(source file)
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(target file)
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;; XXX: On some GNU/Linux
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;; systems, /etc/resolv.conf is a
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;; symlink to a file in a tmpfs
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;; which, for an unknown reason,
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;; cannot be bind mounted
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;; read-only within the
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;; container.
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(writable?
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(string=? "/etc/resolv.conf")))))
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%network-configuration-files)
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'())
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;; Mappings for the union closure of all inputs.
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(map (lambda (dir)
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(file-system-mapping
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(source dir)
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(target dir)
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(writable? #f)))
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reqs)))
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(file-systems (append %container-file-systems
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(map mapping->file-system mappings))))
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(exit/status
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(call-with-container (map file-system->spec file-systems)
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(lambda ()
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;; Setup global shell.
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(mkdir-p "/bin")
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(symlink bash "/bin/sh")
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;; Set a reasonable default PS1.
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(setenv "PS1" "\\u@\\h \\w [env]\\$ ")
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;; Setup directory for temporary files.
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(mkdir-p "/tmp")
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(for-each (lambda (var)
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(setenv var "/tmp"))
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;; The same variables as in Nix's 'build.cc'.
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'("TMPDIR" "TEMPDIR" "TMP" "TEMP"))
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;; Create a dummy home directory under the same name as on the
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;; host.
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(mkdir-p (passwd:dir passwd))
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(setenv "HOME" (passwd:dir passwd))
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;; Create a dummy /etc/passwd to satisfy applications that demand
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;; to read it, such as 'git clone' over SSH, a valid use-case when
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;; sharing the host's network namespace.
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(mkdir-p "/etc")
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(call-with-output-file "/etc/passwd"
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(lambda (port)
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(display (string-join (list (passwd:name passwd)
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"x" ; but there is no shadow
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"0" "0" ; user is now root
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(passwd:gecos passwd)
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(passwd:dir passwd)
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bash)
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":")
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port)
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(newline port)))
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;; For convenience, start in the user's current working
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;; directory rather than the root directory.
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(chdir cwd)
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(primitive-exit/status
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;; A container's environment is already purified, so no need to
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;; request it be purified again.
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(launch-environment command profile paths #f)))
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#:namespaces (if network?
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(delq 'net %namespaces) ; share host network
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%namespaces)))))))
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(define (environment-bash container? bootstrap? system)
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"Return a monadic value in the store monad for the version of GNU Bash
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needed in the environment for SYSTEM, if any. If CONTAINER? is #f, return #f.
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If CONTAINER? and BOOTSTRAP?, return the store path for the bootstrap Bash.
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Otherwise, return the derivation for the Bash package."
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(with-monad %store-monad
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(cond
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((and container? (not bootstrap?))
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(package->derivation bash))
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;; Use the bootstrap Bash instead.
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((and container? bootstrap?)
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|
(interned-file
|
|
(search-bootstrap-binary "bash" system)))
|
|
(else
|
|
(return #f)))))
|
|
|
|
(define (parse-args args)
|
|
"Parse the list of command line arguments ARGS."
|
|
(define (handle-argument arg result)
|
|
(alist-cons 'package (tag-package-arg result arg) result))
|
|
|
|
;; The '--' token is used to separate the command to run from the rest of
|
|
;; the operands.
|
|
(let-values (((args command) (break (cut string=? "--" <>) args)))
|
|
(let ((opts (parse-command-line args %options (list %default-options)
|
|
#:argument-handler handle-argument)))
|
|
(match command
|
|
(() opts)
|
|
(("--") opts)
|
|
(("--" command ...) (alist-cons 'exec command opts))))))
|
|
|
|
(define (assert-container-features)
|
|
"Check if containers can be created and exit with an informative error
|
|
message if any test fails."
|
|
(unless (user-namespace-supported?)
|
|
(report-error (_ "cannot create container: user namespaces unavailable\n"))
|
|
(leave (_ "is your kernel version < 3.10?\n")))
|
|
|
|
(unless (unprivileged-user-namespace-supported?)
|
|
(report-error (_ "cannot create container: unprivileged user cannot create user namespaces\n"))
|
|
(leave (_ "please set /proc/sys/kernel/unprivileged_userns_clone to \"1\"\n")))
|
|
|
|
(unless (setgroups-supported?)
|
|
(report-error (_ "cannot create container: /proc/self/setgroups does not exist\n"))
|
|
(leave (_ "is your kernel version < 3.19?\n"))))
|
|
|
|
;; Entry point.
|
|
(define (guix-environment . args)
|
|
(with-error-handling
|
|
(let* ((opts (parse-args args))
|
|
(pure? (assoc-ref opts 'pure))
|
|
(container? (assoc-ref opts 'container?))
|
|
(network? (assoc-ref opts 'network?))
|
|
(bootstrap? (assoc-ref opts 'bootstrap?))
|
|
(system (assoc-ref opts 'system))
|
|
(command (or (assoc-ref opts 'exec)
|
|
;; Spawn a shell if the user didn't specify
|
|
;; anything in particular.
|
|
(if container?
|
|
;; The user's shell is likely not available
|
|
;; within the container.
|
|
'("/bin/sh")
|
|
(list %default-shell))))
|
|
(packages (options/resolve-packages opts))
|
|
(mappings (pick-all opts 'file-system-mapping))
|
|
(inputs (delete-duplicates
|
|
(append-map (match-lambda
|
|
(('ad-hoc-package package output)
|
|
(package+propagated-inputs package
|
|
output))
|
|
(('package package _)
|
|
(package-environment-inputs package)))
|
|
packages)))
|
|
(paths (delete-duplicates
|
|
(cons $PATH
|
|
(append-map (match-lambda
|
|
((or ((? package? p) _ ...)
|
|
(? package? p))
|
|
(package-native-search-paths p))
|
|
(_ '()))
|
|
inputs))
|
|
eq?)))
|
|
|
|
(when container? (assert-container-features))
|
|
|
|
(with-store store
|
|
;; Use the bootstrap Guile when requested.
|
|
(parameterize ((%graft? (assoc-ref opts 'graft?))
|
|
(%guile-for-build
|
|
(package-derivation
|
|
store
|
|
(if bootstrap?
|
|
%bootstrap-guile
|
|
(canonical-package guile-2.0)))))
|
|
(set-build-options-from-command-line store opts)
|
|
(run-with-store store
|
|
;; Containers need a Bourne shell at /bin/sh.
|
|
(mlet* %store-monad ((bash (environment-bash container?
|
|
bootstrap?
|
|
system))
|
|
(prof-drv (inputs->profile-derivation
|
|
inputs system bootstrap?))
|
|
(profile -> (derivation->output-path prof-drv)))
|
|
;; First build the inputs. This is necessary even for
|
|
;; --search-paths. Additionally, we might need to build bash for
|
|
;; a container.
|
|
(mbegin %store-monad
|
|
(build-environment (if (derivation? bash)
|
|
(list prof-drv bash)
|
|
(list prof-drv))
|
|
opts)
|
|
(cond
|
|
((assoc-ref opts 'dry-run?)
|
|
(return #t))
|
|
((assoc-ref opts 'search-paths)
|
|
(show-search-paths profile paths pure?)
|
|
(return #t))
|
|
(container?
|
|
(let ((bash-binary
|
|
(if bootstrap?
|
|
bash
|
|
(string-append (derivation->output-path bash)
|
|
"/bin/sh"))))
|
|
(launch-environment/container #:command command
|
|
#:bash bash-binary
|
|
#:user-mappings mappings
|
|
#:profile profile
|
|
#:paths paths
|
|
#:network? network?)))
|
|
(else
|
|
(return
|
|
(exit/status
|
|
(launch-environment/fork command profile
|
|
paths pure?)))))))))))))
|