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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2015 David Thompson <davet@gnu.org>
+;;;
+;;; 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
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;;; 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 <http://www.gnu.org/licenses/>.
+
+(define-module (gnu system linux-container)
+ #:use-module (ice-9 match)
+ #:use-module (srfi srfi-1)
+ #:use-module (guix config)
+ #:use-module (guix store)
+ #:use-module (guix gexp)
+ #:use-module (guix derivations)
+ #:use-module (guix monads)
+ #:use-module (gnu build linux-container)
+ #:use-module (gnu system)
+ #:use-module (gnu system file-systems)
+ #:export (mapping->file-system
+ system-container
+ containerized-operating-system
+ container-script))
+
+(define (mapping->file-system mapping)
+ "Return a file system that realizes MAPPING."
+ (match mapping
+ (($ <file-system-mapping> source target writable?)
+ (file-system
+ (mount-point target)
+ (device source)
+ (type "none")
+ (flags (if writable?
+ '(bind-mount)
+ '(bind-mount read-only)))
+ (check? #f)
+ (create-mount-point? #t)))))
+
+(define (system-container os)
+ "Return a derivation that builds OS as a Linux container."
+ (mlet* %store-monad
+ ((profile (operating-system-profile os))
+ (etc (operating-system-etc-directory os))
+ (boot (operating-system-boot-script os #:container? #t))
+ (locale (operating-system-locale-directory os)))
+ (file-union "system-container"
+ `(("boot" ,#~#$boot)
+ ("profile" ,#~#$profile)
+ ("locale" ,#~#$locale)
+ ("etc" ,#~#$etc)))))
+
+(define (containerized-operating-system os mappings)
+ "Return an operating system based on OS for use in a Linux container
+environment. MAPPINGS is a list of <file-system-mapping> to realize in the
+containerized OS."
+ (define user-file-systems
+ (remove (lambda (fs)
+ (let ((target (file-system-mount-point fs))
+ (source (file-system-device fs)))
+ (or (string=? target (%store-prefix))
+ (string=? target "/")
+ (string-prefix? "/dev/" source)
+ (string-prefix? "/dev" target)
+ (string-prefix? "/sys" target))))
+ (operating-system-file-systems os)))
+
+ (define (mapping->fs fs)
+ (file-system (inherit (mapping->file-system fs))
+ (needed-for-boot? #t)))
+
+ (operating-system (inherit os)
+ (swap-devices '()) ; disable swap
+ (file-systems (append (map mapping->fs (cons %store-mapping mappings))
+ %container-file-systems
+ user-file-systems))))
+
+(define* (container-script os #:key (mappings '()))
+ "Return a derivation of a script that runs OS as a Linux container.
+MAPPINGS is a list of <file-system> objects that specify the files/directories
+that will be shared with the host system."
+ (let* ((os (containerized-operating-system os mappings))
+ (file-systems (filter file-system-needed-for-boot?
+ (operating-system-file-systems os)))
+ (specs (map file-system->spec file-systems)))
+
+ (mlet* %store-monad ((os-drv (system-container os)))
+
+ (define script
+ #~(begin
+ (use-modules (gnu build linux-container)
+ (guix build utils))
+
+ (call-with-container '#$specs
+ (lambda ()
+ (setenv "HOME" "/root")
+ (setenv "TMPDIR" "/tmp")
+ (setenv "GUIX_NEW_SYSTEM" #$os-drv)
+ (for-each mkdir-p '("/run" "/bin" "/etc" "/home" "/var"))
+ (primitive-load (string-append #$os-drv "/boot"))))))
+
+ (gexp->script "run-container" script
+ #:modules '((ice-9 match)
+ (srfi srfi-98)
+ (guix config)
+ (guix utils)
+ (guix build utils)
+ (guix build syscalls)
+ (gnu build file-systems)
+ (gnu build linux-container))))))