;;; GNU Guix --- Functional package management for GNU ;;; Copyright © 2014, 2015 Ludovic Courtès ;;; ;;; 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 . (define-module (guix scripts system) #:use-module (guix config) #:use-module (guix ui) #:use-module (guix store) #:use-module (guix gexp) #:use-module (guix derivations) #:use-module (guix packages) #:use-module (guix utils) #:use-module (guix monads) #:use-module (guix profiles) #:use-module (guix scripts) #:use-module (guix scripts build) #:use-module (guix scripts graph) #:use-module (guix build utils) #:use-module (gnu build install) #:use-module (gnu system) #:use-module (gnu system file-systems) #:use-module (gnu system vm) #:use-module (gnu system grub) #:use-module (gnu services) #:use-module (gnu packages grub) #:use-module (srfi srfi-1) #:use-module (srfi srfi-19) #:use-module (srfi srfi-26) #:use-module (srfi srfi-37) #:use-module (ice-9 match) #:export (guix-system read-operating-system)) ;;; ;;; Operating system declaration. ;;; (define %user-module ;; Module in which the machine description file is loaded. (make-user-module '((gnu system) (gnu services) (gnu system shadow)))) (define (read-operating-system file) "Read the operating-system declaration from FILE and return it." (load* file %user-module)) ;;; ;;; Installation. ;;; ;; TODO: Factorize. (define references* (store-lift references)) (define topologically-sorted* (store-lift topologically-sorted)) (define* (copy-item item target #:key (log-port (current-error-port))) "Copy ITEM to the store under root directory TARGET and register it." (mlet* %store-monad ((refs (references* item))) (let ((dest (string-append target item)) (state (string-append target "/var/guix"))) (format log-port "copying '~a'...~%" item) ;; Remove DEST if it exists to make sure that (1) we do not fail badly ;; while trying to overwrite it (see ), and ;; (2) we end up with the right contents. (when (file-exists? dest) (delete-file-recursively dest)) (copy-recursively item dest #:log (%make-void-port "w")) ;; Register ITEM; as a side-effect, it resets timestamps, etc. ;; Explicitly use "TARGET/var/guix" as the state directory, to avoid ;; reproducing the user's current settings; see ;; . (unless (register-path item #:prefix target #:state-directory state #:references refs) (leave (_ "failed to register '~a' under '~a'~%") item target)) (return #t)))) (define* (copy-closure item target #:key (log-port (current-error-port))) "Copy ITEM and all its dependencies to the store under root directory TARGET, and register them." (mlet* %store-monad ((refs (references* item)) (to-copy (topologically-sorted* (delete-duplicates (cons item refs) string=?)))) (sequence %store-monad (map (cut copy-item <> target #:log-port log-port) to-copy)))) (define (install-grub* grub.cfg device target) "This is a variant of 'install-grub' with error handling, lifted in %STORE-MONAD" (let* ((gc-root (string-append %gc-roots-directory "/grub.cfg")) (temp-gc-root (string-append gc-root ".new")) (delete-file (lift1 delete-file %store-monad)) (make-symlink (lift2 switch-symlinks %store-monad)) (rename (lift2 rename-file %store-monad))) (mbegin %store-monad ;; Prepare the symlink to GRUB.CFG to make sure that it's a GC root when ;; 'install-grub' completes (being a bit paranoid.) (make-symlink temp-gc-root grub.cfg) (munless (false-if-exception (install-grub grub.cfg device target)) (delete-file temp-gc-root) (leave (_ "failed to install GRUB on device '~a'~%") device)) ;; Register GRUB.CFG as a GC root so that its dependencies (background ;; image, font, etc.) are not reclaimed. (rename temp-gc-root gc-root)))) (define* (install os-drv target #:key (log-port (current-output-port)) grub? grub.cfg device) "Copy the closure of GRUB.CFG, which includes the output of OS-DRV, to directory TARGET. TARGET must be an absolute directory name since that's what 'guix-register' expects. When GRUB? is true, install GRUB on DEVICE, using GRUB.CFG." (define (maybe-copy to-copy) (with-monad %store-monad (if (string=? target "/") (begin (warning (_ "initializing the current root file system~%")) (return #t)) (begin ;; Make sure the target store exists. (mkdir-p (string-append target (%store-prefix))) ;; Copy items to the new store. (copy-closure to-copy target #:log-port log-port))))) ;; Make sure TARGET is root-owned when running as root, but still allow ;; non-root uses (useful for testing.) See ;; . (if (zero? (geteuid)) (chown target 0 0) (warning (_ "not running as 'root', so \ the ownership of '~a' may be incorrect!~%") target)) (chmod target #o755) (let ((os-dir (derivation->output-path os-drv)) (format (lift format %store-monad)) (populate (lift2 populate-root-file-system %store-monad))) (mbegin %store-monad ;; Copy the closure of GRUB.CFG, which includes OS-DIR, GRUB's ;; background image and so on. (maybe-copy grub.cfg) ;; Create a bunch of additional files. (format log-port "populating '~a'...~%" target) (populate os-dir target) (mwhen grub? (install-grub* grub.cfg device target))))) ;;; ;;; Reconfiguration. ;;; (define %system-profile ;; The system profile. (string-append %state-directory "/profiles/system")) (define-syntax-rule (save-environment-excursion body ...) "Save the current environment variables, run BODY..., and restore them." (let ((env (environ))) (dynamic-wind (const #t) (lambda () body ...) (lambda () (environ env))))) (define* (switch-to-system os #:optional (profile %system-profile)) "Make a new generation of PROFILE pointing to the directory of OS, switch to it atomically, and then run OS's activation script." (mlet* %store-monad ((drv (operating-system-derivation os)) (script (operating-system-activation-script os))) (let* ((system (derivation->output-path drv)) (number (+ 1 (generation-number profile))) (generation (generation-file-name profile number))) (symlink system generation) (switch-symlinks profile generation) (format #t (_ "activating system...~%")) ;; The activation script may change $PATH, among others, so protect ;; against that. (return (save-environment-excursion ;; Tell 'activate-current-system' what the new system is. (setenv "GUIX_NEW_SYSTEM" system) (primitive-load (derivation->output-path script)))) ;; TODO: Run 'deco reload ...'. ))) (define-syntax-rule (unless-file-not-found exp) (catch 'system-error (lambda () exp) (lambda args (if (= ENOENT (system-error-errno args)) #f (apply throw args))))) (define (seconds->string seconds) "Return a string representing the date for SECONDS." (let ((time (make-time time-utc 0 seconds))) (date->string (time-utc->date time) "~Y-~m-~d ~H:~M"))) (define* (previous-grub-entries #:optional (profile %system-profile)) "Return a list of 'menu-entry' for the generations of PROFILE." (define (system->grub-entry system number time) (unless-file-not-found (call-with-input-file (string-append system "/parameters") (lambda (port) (match (read port) (('boot-parameters ('version 0) ('label label) ('root-device root) ('kernel linux) rest ...) (menu-entry (label (string-append label " (#" (number->string number) ", " (seconds->string time) ")")) (linux linux) (linux-arguments (cons* (string-append "--root=" root) #~(string-append "--system=" #$system) #~(string-append "--load=" #$system "/boot") (match (assq 'kernel-arguments rest) ((_ args) args) (#f '())))) ;old format (initrd #~(string-append #$system "/initrd")))) (_ ;unsupported format (warning (_ "unrecognized boot parameters for '~a'~%") system) #f)))))) (let* ((numbers (generation-numbers profile)) (systems (map (cut generation-file-name profile <>) numbers)) (times (map (lambda (system) (unless-file-not-found (stat:mtime (lstat system)))) systems))) (filter-map system->grub-entry systems numbers times))) ;;; ;;; Graph. ;;; (define (service-node-label service) "Return a label to represent SERVICE." (let ((type (service-kind service)) (value (service-parameters service))) (string-append (symbol->string (service-type-name type)) (cond ((or (number? value) (symbol? value)) (string-append " " (object->string value))) ((string? value) (string-append " " value)) ((file-system? value) (string-append " " (file-system-mount-point value))) (else ""))))) (define (service-node-type services) "Return a node type for SERVICES. Since instances are not self-contained (they express dependencies on service types, not on services), we have to create the 'edges' procedure dynamically as a function of the full list of services." (node-type (name "service") (description "the DAG of services") (identifier (lift1 object-address %store-monad)) (label service-node-label) (edges (lift1 (service-back-edges services) %store-monad)))) ;;; ;;; Action. ;;; (define* (system-derivation-for-action os action #:key image-size full-boot? mappings) "Return as a monadic value the derivation for OS according to ACTION." (case action ((build init reconfigure) (operating-system-derivation os)) ((vm-image) (system-qemu-image os #:disk-image-size image-size)) ((vm) (system-qemu-image/shared-store-script os #:full-boot? full-boot? #:disk-image-size image-size #:mappings mappings)) ((disk-image) (system-disk-image os #:disk-image-size image-size)))) (define* (perform-action action os #:key grub? dry-run? derivations-only? use-substitutes? device target image-size full-boot? (mappings '())) "Perform ACTION for OS. GRUB? specifies whether to install GRUB; DEVICE is the target devices for GRUB; TARGET is the target root directory; IMAGE-SIZE is the size of the image to be built, for the 'vm-image' and 'disk-image' actions. FULL-BOOT? is used for the 'vm' action; it determines whether to boot directly to the kernel or to the bootloader. When DERIVATIONS-ONLY? is true, print the derivation file name(s) without building anything." (define println (cut format #t "~a~%" <>)) (mlet* %store-monad ((sys (system-derivation-for-action os action #:image-size image-size #:full-boot? full-boot? #:mappings mappings)) (grub (package->derivation grub)) (grub.cfg (operating-system-grub.cfg os (if (eq? 'init action) '() (previous-grub-entries)))) (drvs -> (if (and grub? (memq action '(init reconfigure))) (list sys grub grub.cfg) (list sys))) (% (if derivations-only? (return (for-each (compose println derivation-file-name) drvs)) (maybe-build drvs #:dry-run? dry-run? #:use-substitutes? use-substitutes?)))) (if (or dry-run? derivations-only?) (return #f) (begin (for-each (compose println derivation->output-path) drvs) ;; Make sure GRUB is accessible. (when grub? (let ((prefix (derivation->output-path grub))) (setenv "PATH" (string-append prefix "/bin:" prefix "/sbin:" (getenv "PATH"))))) (case action ((reconfigure) (mbegin %store-monad (switch-to-system os) (mwhen grub? (install-grub* (derivation->output-path grub.cfg) device "/")))) ((init) (newline) (format #t (_ "initializing operating system under '~a'...~%") target) (install sys (canonicalize-path target) #:grub? grub? #:grub.cfg (derivation->output-path grub.cfg) #:device device)) (else ;; All we had to do was to build SYS. (return (derivation->output-path sys)))))))) (define (export-extension-graph os port) "Export the service extension graph of OS to PORT." (let* ((services (operating-system-services os)) (boot (find (lambda (service) (eq? (service-kind service) boot-service-type)) services))) (export-graph (list boot) (current-output-port) #:node-type (service-node-type services) #:reverse-edges? #t))) ;;; ;;; Options. ;;; (define (show-help) (display (_ "Usage: guix system [OPTION] ACTION FILE Build the operating system declared in FILE according to ACTION.\n")) (newline) (display (_ "The valid values for ACTION are:\n")) (newline) (display (_ "\ reconfigure switch to a new operating system configuration\n")) (display (_ "\ build build the operating system without installing anything\n")) (display (_ "\ vm build a virtual machine image that shares the host's store\n")) (display (_ "\ vm-image build a freestanding virtual machine image\n")) (display (_ "\ disk-image build a disk image, suitable for a USB stick\n")) (display (_ "\ init initialize a root file system to run GNU\n")) (display (_ "\ extension-graph emit the service extension graph in Dot format\n")) (show-build-options-help) (display (_ " -d, --derivation return the derivation of the given system")) (display (_ " --on-error=STRATEGY apply STRATEGY when an error occurs while reading FILE")) (display (_ " --image-size=SIZE for 'vm-image', produce an image of SIZE")) (display (_ " --no-grub for 'init', do not install GRUB")) (display (_ " --share=SPEC for 'vm', share host file system according to SPEC")) (display (_ " --expose=SPEC for 'vm', expose host file system according to SPEC")) (display (_ " --full-boot for 'vm', make a full boot sequence")) (newline) (display (_ " -h, --help display this help and exit")) (display (_ " -V, --version display version information and exit")) (newline) (show-bug-report-information)) (define (specification->file-system-mapping spec writable?) "Read the SPEC and return the corresponding ." (let ((index (string-index spec #\=))) (if index (file-system-mapping (source (substring spec 0 index)) (target (substring spec (+ 1 index))) (writable? writable?)) (file-system-mapping (source spec) (target spec) (writable? writable?))))) (define %options ;; Specifications of the command-line options. (cons* (option '(#\h "help") #f #f (lambda args (show-help) (exit 0))) (option '(#\V "version") #f #f (lambda args (show-version-and-exit "guix system"))) (option '(#\d "derivation") #f #f (lambda (opt name arg result) (alist-cons 'derivations-only? #t result))) (option '("on-error") #t #f (lambda (opt name arg result) (alist-cons 'on-error (string->symbol arg) result))) (option '("image-size") #t #f (lambda (opt name arg result) (alist-cons 'image-size (size->number arg) result))) (option '("no-grub") #f #f (lambda (opt name arg result) (alist-cons 'install-grub? #f result))) (option '("full-boot") #f #f (lambda (opt name arg result) (alist-cons 'full-boot? #t result))) (option '("share") #t #f (lambda (opt name arg result) (alist-cons 'file-system-mapping (specification->file-system-mapping arg #t) result))) (option '("expose") #t #f (lambda (opt name arg result) (alist-cons 'file-system-mapping (specification->file-system-mapping arg #f) result))) (option '(#\n "dry-run") #f #f (lambda (opt name arg result) (alist-cons 'dry-run? #t result))) (option '(#\s "system") #t #f (lambda (opt name arg result) (alist-cons 'system arg (alist-delete 'system result eq?)))) %standard-build-options)) (define %default-options ;; Alist of default option values. `((system . ,(%current-system)) (substitutes? . #t) (build-hook? . #t) (max-silent-time . 3600) (verbosity . 0) (image-size . ,(* 900 (expt 2 20))) (install-grub? . #t))) ;;; ;;; Entry point. ;;; (define (guix-system . args) (define (parse-sub-command arg result) ;; Parse sub-command ARG and augment RESULT accordingly. (if (assoc-ref result 'action) (alist-cons 'argument arg result) (let ((action (string->symbol arg))) (case action ((build vm vm-image disk-image reconfigure init extension-graph) (alist-cons 'action action result)) (else (leave (_ "~a: unknown action~%") action)))))) (define (match-pair car) ;; Return a procedure that matches a pair with CAR. (match-lambda ((head . tail) (and (eq? car head) tail)) (_ #f))) (define (option-arguments opts) ;; Extract the plain arguments from OPTS. (let* ((args (reverse (filter-map (match-pair 'argument) opts))) (count (length args)) (action (assoc-ref opts 'action))) (define (fail) (leave (_ "wrong number of arguments for action '~a'~%") action)) (unless action (format (current-error-port) (_ "guix system: missing command name~%")) (format (current-error-port) (_ "Try 'guix system --help' for more information.~%")) (exit 1)) (case action ((build vm vm-image disk-image reconfigure) (unless (= count 1) (fail))) ((init) (unless (= count 2) (fail)))) args)) (with-error-handling (let* ((opts (parse-command-line args %options (list %default-options) #:argument-handler parse-sub-command)) (args (option-arguments opts)) (file (first args)) (action (assoc-ref opts 'action)) (system (assoc-ref opts 'system)) (os (if file (load* file %user-module #:on-error (assoc-ref opts 'on-error)) (leave (_ "no configuration file specified~%")))) (dry? (assoc-ref opts 'dry-run?)) (grub? (assoc-ref opts 'install-grub?)) (target (match args ((first second) second) (_ #f))) (device (and grub? (grub-configuration-device (operating-system-bootloader os)))) (store (open-connection))) (set-build-options-from-command-line store opts) (run-with-store store (mbegin %store-monad (set-guile-for-build (default-guile)) (case action ((extension-graph) (export-extension-graph os (current-output-port))) (else (perform-action action os #:dry-run? dry? #:derivations-only? (assoc-ref opts 'derivations-only?) #:use-substitutes? (assoc-ref opts 'substitutes?) #:image-size (assoc-ref opts 'image-size) #:full-boot? (assoc-ref opts 'full-boot?) #:mappings (filter-map (match-lambda (('file-system-mapping . m) m) (_ #f)) opts) #:grub? grub? #:target target #:device device)))) #:system system)))) ;;; system.scm ends here