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Re: Running IceCat in a container

From: Ludovic Courtès
Subject: Re: Running IceCat in a container
Date: Thu, 25 Jan 2018 23:16:47 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.3 (gnu/linux)

address@hidden (Ludovic Courtès) skribis:

> Mike Gerwitz <address@hidden> skribis:
>> On Tue, Jan 16, 2018 at 17:30:42 +0100, Ludovic Courtès wrote:
> [...]
>>> But really, we should make a specific tool for this.
>>> Thoughts?
>> Yes, though I'd be curious how you'd approach it---each package requires
>> certain paths be shared, and those paths would further depend on user
>> privacy preferences, so need to be able to be overridden.
> For a start, we could simply share everything that’s in:
>   guix gc -R $(guix build the-package)
> plus /tmp/.X11-unix, maybe $PWD, and a few more.

If you drop the attached file under guix/scripts/, you can then run:

  guix run icecat icecat

and similar.  This particular example doesn’t work well because of the
font issue you’re familiar with, but you get the idea.  :-)


;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2018 Ludovic Courtès <address@hidden>
;;; This file is part of GNU Guix.
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; GNU General Public License for more details.
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix.  If not, see <>.

(define-module (guix scripts run)
  #:use-module (guix ui)
  #:use-module (guix scripts)
  #:use-module (guix store)
  #:use-module (guix packages)
  #:use-module (guix derivations)
  #:use-module ((guix build utils) #:select (which mkdir-p))
  #:use-module (gnu build linux-container)
  #:use-module (gnu system file-systems)
  #:use-module (gnu packages)
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-11)
  #:use-module (srfi srfi-37)
  #:use-module (ice-9 match)
  #:export (guix-run))

(define %options
  (list (option '(#\h "help") #f #f
                (lambda args
                  (exit 0)))
        (option '(#\V "version") #f #f
                (lambda args
                  (show-version-and-exit "guix run")))))

(define (show-help)
  (display (G_ "Usage: guix run PACKAGE COMMAND...
Run COMMAND from PACKAGE in a container.\n"))
  (display (G_ "
  -h, --help             display this help and exit"))
  (display (G_ "
  -V, --version          display version information and exit"))

(define (bind-mount-spec/ro item)
  (and (file-exists? item)
         (device item)
         (mount-point item)
         (title 'device)
         (type "none")
         (flags '(bind-mount read-only))
         (check? #f))))

(define (bind-mount-spec/rw item)
  (and (file-exists? item)
         (inherit (bind-mount-spec/ro item))
         (flags '(bind-mount)))))

(define %writable-things
  (list "/var/run/nscd/socket"
        (string-append (getenv "HOME") "/.Xauthority")

(define (guix-run . args)
    (match (reverse (parse-command-line args %options '(())
                                        #:argument-handler cons))
      ((spec command args ...)
       (with-store store
         (let-values (((package output)
                       (specification->package+output spec)))
           (let* ((drv    (package-derivation store package))
                  (prefix (derivation->output-path drv output)))
             (show-what-to-build store (list drv))
             (build-derivations store (list drv))

             (let* ((items (requisites store (list prefix)))
                    (env   (environ))
                    (full  (search-path (list (string-append prefix "/bin")
                                              (string-append prefix "/sbin"))
               (unless full
                 (leave (G_ "command '~a' not found in package '~a'~%")
                        command (package-name package)))

                   (append (filter-map bind-mount-spec/ro items)
                           (filter-map bind-mount-spec/rw %writable-things))
                 (lambda ()
                   (environ env)                  ;TODO: filter ENV
                   (mkdir-p (getenv "HOME"))

                   (catch #t
                     (lambda ()
                       (apply execl full command args))
                     (lambda (key . args)
                       (print-exception (current-error-port) #f key args)
                       (exit 1))))
                 #:namespaces (delq 'net %namespaces))))))))))

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