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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014, 2015, 2016, 2017, 2018, 2019, 2020 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2016 Alex Kost <alezost@gmail.com>
;;; Copyright © 2016, 2017, 2018 Chris Marusich <cmmarusich@gmail.com>
;;; Copyright © 2017, 2019 Mathieu Othacehe <m.othacehe@gmail.com>
;;; Copyright © 2018 Ricardo Wurmus <rekado@elephly.net>
;;; Copyright © 2019 Christopher Baines <mail@cbaines.net>
;;; Copyright © 2020 Jan (janneke) Nieuwenhuizen <janneke@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 (guix scripts system)
#:use-module (guix config)
#:use-module (guix ui)
#:use-module ((guix status) #:select (with-status-verbosity))
#:use-module (guix store)
#:autoload (guix store database) (register-path)
#:use-module (guix describe)
#:use-module (guix grafts)
#:use-module (guix gexp)
#:use-module (guix derivations)
#:use-module (guix packages)
#:use-module (guix utils)
#:use-module (guix monads)
#:use-module (guix records)
#:use-module (guix profiles)
#:use-module (guix scripts)
#:use-module (guix channels)
#:use-module (guix scripts build)
#:autoload (guix scripts package) (delete-generations
delete-matching-generations)
#:autoload (guix scripts pull) (channel-commit-hyperlink)
#:use-module (guix graph)
#:use-module (guix scripts graph)
#:use-module (guix scripts system reconfigure)
#:use-module (guix build utils)
#:use-module (guix progress)
#:use-module ((guix build syscalls) #:select (terminal-columns))
#:use-module (gnu build install)
#:autoload (gnu build file-systems)
(find-partition-by-label find-partition-by-uuid)
#:autoload (gnu build linux-modules)
(device-module-aliases matching-modules)
#:use-module (gnu system linux-initrd)
#:use-module (gnu image)
#:use-module (gnu system)
#:use-module (gnu bootloader)
#:use-module (gnu system file-systems)
#:use-module (gnu system image)
#:use-module (gnu system mapped-devices)
#:use-module (gnu system linux-container)
#:use-module (gnu system uuid)
#:use-module (gnu system vm)
#:use-module (gnu services)
#:use-module (gnu services shepherd)
#:use-module (gnu services herd)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-11)
#:use-module (srfi srfi-19)
#:use-module (srfi srfi-26)
#:use-module (srfi srfi-34)
#:use-module (srfi srfi-35)
#:use-module (srfi srfi-37)
#:use-module (ice-9 format)
#:use-module (ice-9 match)
#:use-module (rnrs bytevectors)
#: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.
;;;
(define-syntax-rule (save-load-path-excursion body ...)
"Save the current values of '%load-path' and '%load-compiled-path', run
BODY..., and restore them."
(let ((path %load-path)
(cpath %load-compiled-path))
(dynamic-wind
(const #t)
(lambda ()
body ...)
(lambda ()
(set! %load-path path)
(set! %load-compiled-path cpath)))))
(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 topologically-sorted*
(store-lift topologically-sorted))
(define* (copy-item item references target
#:key (log-port (current-error-port)))
"Copy ITEM to the store under root directory TARGET and register it with
REFERENCES as its set of references."
(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 <http://bugs.gnu.org/20722>), and
;; (2) we end up with the right contents.
(when (false-if-exception (lstat dest))
(for-each make-file-writable
(find-files dest (lambda (file stat)
(eq? 'directory (stat:type stat)))
#:directories? #t))
(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
;; <http://bugs.gnu.org/18049>.
(unless (register-path item
#:prefix target
#:state-directory state
#:references references)
(leave (G_ "failed to register '~a' under '~a'~%")
item target))))
(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 ((to-copy (topologically-sorted* (list item)))
(refs (mapm %store-monad references* to-copy))
(info (mapm %store-monad query-path-info*
(delete-duplicates
(append to-copy (concatenate refs)))))
(size -> (reduce + 0 (map path-info-nar-size info))))
(define progress-bar
(progress-reporter/bar (length to-copy)
(format #f (G_ "copying to '~a'...")
target)))
(check-available-space size target)
(call-with-progress-reporter progress-bar
(lambda (report)
(let ((void (%make-void-port "w")))
(for-each (lambda (item refs)
(copy-item item refs target #:log-port void)
(report))
to-copy refs))))
(return *unspecified*)))
(define* (install os-drv target
#:key (log-port (current-output-port))
install-bootloader? bootloader bootcfg)
"Copy the closure of BOOTCFG, which includes the output of OS-DRV, to
directory TARGET. TARGET must be an absolute directory name since that's what
'register-path' expects.
When INSTALL-BOOTLOADER? is true, install bootloader using BOOTCFG."
(define (maybe-copy to-copy)
(with-monad %store-monad
(if (string=? target "/")
(begin
(warning (G_ "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
;; <http://lists.gnu.org/archive/html/guix-devel/2015-05/msg00452.html>.
(if (zero? (geteuid))
(chown target 0 0)
(warning (G_ "not running as 'root', so \
the ownership of '~a' may be incorrect!~%")
target))
;; If a previous installation was attempted, make sure we start anew; in
;; particular, we don't want to keep a store database that might not
;; correspond to what we're actually putting in the store.
(let ((state (string-append target "/var/guix")))
(when (file-exists? state)
(delete-file-recursively state)))
(chmod target #o755)
(let ((os-dir (derivation->output-path os-drv))
(format (lift format %store-monad))
(populate (lift2 populate-root-file-system %store-monad)))
(mlet %store-monad ((bootcfg (lower-object bootcfg)))
(mbegin %store-monad
;; Copy the closure of BOOTCFG, which includes OS-DIR,
;; eventual background image and so on.
(maybe-copy (derivation->output-path bootcfg))
;; Create a bunch of additional files.
(format log-port "populating '~a'...~%" target)
(populate os-dir target)
(mwhen install-bootloader?
(install-bootloader local-eval bootloader bootcfg
#:target target)
(return
(info (G_ "bootloader successfully installed on '~a'~%")
(bootloader-configuration-target bootloader))))))))
;;;
;;; Reconfiguration.
;;;
(define %system-profile
;; The system profile.
(string-append %state-directory "/profiles/system"))
(define-syntax-rule (with-shepherd-error-handling mbody ...)
"Catch and report Shepherd errors that arise when binding MBODY, a monadic
expression in %STORE-MONAD."
(lambda (store)
(catch 'system-error
(lambda ()
(guard (c ((shepherd-error? c)
(values (report-shepherd-error c) store)))
(values (run-with-store store (mbegin %store-monad mbody ...))
store)))
(lambda (key proc format-string format-args errno . rest)
(warning (G_ "while talking to shepherd: ~a~%")
(apply format #f format-string format-args))
(values #f store)))))
(define (report-shepherd-error error)
"Report ERROR, a '&shepherd-error' error condition object."
(cond ((service-not-found-error? error)
(report-error (G_ "service '~a' could not be found~%")
(service-not-found-error-service error)))
((action-not-found-error? error)
(report-error (G_ "service '~a' does not have an action '~a'~%")
(action-not-found-error-service error)
(action-not-found-error-action error)))
((action-exception-error? error)
(report-error (G_ "exception caught while executing '~a' \
on service '~a':~%")
(action-exception-error-action error)
(action-exception-error-service error))
(print-exception (current-error-port) #f
(action-exception-error-key error)
(action-exception-error-arguments error)))
((unknown-shepherd-error? error)
(report-error (G_ "something went wrong: ~s~%")
(unknown-shepherd-error-sexp error)))
((shepherd-error? error)
(report-error (G_ "shepherd error~%")))
((not error) ;not an error
#t)))
(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* (profile-boot-parameters #:optional (profile %system-profile)
(numbers
(reverse (generation-numbers profile))))
"Return a list of 'boot-parameters' for the generations of PROFILE specified
by NUMBERS, which is a list of generation numbers. The list is ordered from
the most recent to the oldest profiles."
(define (system->boot-parameters system number time)
(unless-file-not-found
(let* ((params (read-boot-parameters-file system))
(label (boot-parameters-label params)))
(boot-parameters
(inherit params)
(label (string-append label " (#"
(number->string number) ", "
(seconds->string time) ")"))))))
(let* ((systems (map (cut generation-file-name profile <>)
numbers))
(times (map (lambda (system)
(unless-file-not-found
(stat:mtime (lstat system))))
systems)))
(filter-map system->boot-parameters systems numbers times)))
;;;
;;; Roll-back.
;;;
(define (roll-back-system store)
"Roll back the system profile to its previous generation. STORE is an open
connection to the store."
(switch-to-system-generation store "-1"))
;;;
;;; Switch generations.
;;;
(define (switch-to-system-generation store spec)
"Switch the system profile to the generation specified by SPEC, and
re-install bootloader with a configuration file that uses the specified system
generation as its default entry. STORE is an open connection to the store."
(let ((number (relative-generation-spec->number %system-profile spec)))
(if number
(begin
(reinstall-bootloader store number)
(switch-to-generation* %system-profile number))
(leave (G_ "cannot switch to system generation '~a'~%") spec))))
(define* (system-bootloader-name #:optional (system %system-profile))
"Return the bootloader name stored in SYSTEM's \"parameters\" file."
(let ((params (unless-file-not-found
(read-boot-parameters-file system))))
(boot-parameters-bootloader-name params)))
(define (reinstall-bootloader store number)
"Re-install bootloader for existing system profile generation NUMBER.
STORE is an open connection to the store."
(let* ((generation (generation-file-name %system-profile number))
;; Detect the bootloader used in %system-profile.
(bootloader (lookup-bootloader-by-name (system-bootloader-name)))
;; Use the detected bootloader with default configuration.
;; It will be enough to allow the system to boot.
(bootloader-config (bootloader-configuration
(bootloader bootloader)))
;; Make the specified system generation the default entry.
(params (first (profile-boot-parameters %system-profile
(list number))))
(old-generations
(delv number (reverse (generation-numbers %system-profile))))
(old-params (profile-boot-parameters
%system-profile old-generations))
(entries (cons (boot-parameters->menu-entry params)
(boot-parameters-bootloader-menu-entries params)))
(old-entries (map boot-parameters->menu-entry old-params)))
(run-with-store store
(mlet* %store-monad
((bootcfg (lower-object
((bootloader-configuration-file-generator bootloader)
bootloader-config entries
#:old-entries old-entries)))
(drvs -> (list bootcfg)))
(mbegin %store-monad
(built-derivations drvs)
;; Only install bootloader configuration file.
(install-bootloader local-eval bootloader-config bootcfg
#:run-installer? #f))))))
;;;
;;; Graphs.
;;;
(define (service-node-label service)
"Return a label to represent SERVICE."
(let ((type (service-kind service))
(value (service-value 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 <service> 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))))
(define (shepherd-service-node-label service)
"Return a label for a node representing a <shepherd-service>."
(string-join (map symbol->string (shepherd-service-provision service))))
(define (shepherd-service-node-type services)
"Return a node type for SERVICES, a list of <shepherd-service>."
(node-type
(name "shepherd-service")
(description "the dependency graph of shepherd services")
(identifier (lift1 shepherd-service-node-label %store-monad))
(label shepherd-service-node-label)
(edges (lift1 (shepherd-service-back-edges services) %store-monad))))
;;;
;;; Generations.
;;;
(define* (display-system-generation number
#:optional (profile %system-profile))
"Display a summary of system generation NUMBER in a human-readable format."
(define (display-channel channel)
(format #t " ~a:~%" (channel-name channel))
(format #t (G_ " repository URL: ~a~%") (channel-url channel))
(when (channel-branch channel)
(format #t (G_ " branch: ~a~%") (channel-branch channel)))
(format #t (G_ " commit: ~a~%")
(if (supports-hyperlinks?)
(channel-commit-hyperlink channel)
(channel-commit channel))))
(unless (zero? number)
(let* ((generation (generation-file-name profile number))
(params (read-boot-parameters-file generation))
(label (boot-parameters-label params))
(bootloader-name (boot-parameters-bootloader-name params))
(root (boot-parameters-root-device params))
(root-device (if (bytevector? root)
(uuid->string root)
root))
(kernel (boot-parameters-kernel params))
(multiboot-modules (boot-parameters-multiboot-modules params)))
(define-values (channels config-file)
(system-provenance generation))
(display-generation profile number)
(format #t (G_ " file name: ~a~%") generation)
(format #t (G_ " canonical file name: ~a~%") (readlink* generation))
;; TRANSLATORS: Please preserve the two-space indentation.
(format #t (G_ " label: ~a~%") label)
(format #t (G_ " bootloader: ~a~%") bootloader-name)
;; TRANSLATORS: The '~[', '~;', and '~]' sequences in this string must
;; be preserved. They denote conditionals, such that the result will
;; look like:
;; root device: UUID: 12345-678
;; or:
;; root device: label: "my-root"
;; or just:
;; root device: /dev/sda3
(format #t (G_ " root device: ~[UUID: ~a~;label: ~s~;~a~]~%")
(cond ((uuid? root-device) 0)
((file-system-label? root-device) 1)
(else 2))
(file-system-device->string root-device))
(format #t (G_ " kernel: ~a~%") kernel)
(match multiboot-modules
(() #f)
(((modules . _) ...)
(format #t (G_ " multiboot: ~a~%")
(string-join modules "\n "))))
(unless (null? channels)
;; TRANSLATORS: Here "channel" is the same terminology as used in
;; "guix describe" and "guix pull --channels".
(format #t (G_ " channels:~%"))
(for-each display-channel channels))
(when config-file
(format #t (G_ " configuration file: ~a~%")
(if (supports-hyperlinks?)
(file-hyperlink config-file)
config-file))))))
(define* (list-generations pattern #:optional (profile %system-profile))
"Display in a human-readable format all the system generations matching
PATTERN, a string. When PATTERN is #f, display all the system generations."
(cond ((not (file-exists? profile)) ; XXX: race condition
(raise (condition (&profile-not-found-error
(profile profile)))))
((not pattern)
(for-each display-system-generation (profile-generations profile)))
((matching-generations pattern profile)
=>
(lambda (numbers)
(if (null-list? numbers)
(exit 1)
(leave-on-EPIPE
(for-each display-system-generation numbers)))))))
;;;
;;; File system declaration checks.
;;;
(define (check-file-system-availability file-systems)
"Check whether the UUIDs or partition labels that FILE-SYSTEMS refer to, if
any, are available. Raise an error if they're not."
(define relevant
(filter (lambda (fs)
(and (file-system-mount? fs)
(not (member (file-system-type fs)
%pseudo-file-system-types))
;; Don't try to validate network file systems.
(not (string-prefix? "nfs" (file-system-type fs)))
(not (memq 'bind-mount (file-system-flags fs)))))
file-systems))
(define labeled
(filter (lambda (fs)
(file-system-label? (file-system-device fs)))
relevant))
(define literal
(filter (lambda (fs)
(string? (file-system-device fs)))
relevant))
(define uuid
(filter (lambda (fs)
(uuid? (file-system-device fs)))
relevant))
(define fail? #f)
(define (file-system-location* fs)
(location->string
(source-properties->location
(file-system-location fs))))
(let-syntax ((error (syntax-rules ()
((_ args ...)
(begin
(set! fail? #t)
(format (current-error-port)
args ...))))))
(for-each (lambda (fs)
(catch 'system-error
(lambda ()
(stat (file-system-device fs)))
(lambda args
(let ((errno (system-error-errno args))
(device (file-system-device fs)))
(error (G_ "~a: error: device '~a' not found: ~a~%")
(file-system-location* fs) device
(strerror errno))
(unless (string-prefix? "/" device)
(display-hint (format #f (G_ "If '~a' is a file system
label, write @code{(file-system-label ~s)} in your @code{device} field.")
device device)))))))
literal)
(for-each (lambda (fs)
(let ((label (file-system-label->string
(file-system-device fs))))
(unless (find-partition-by-label label)
(error (G_ "~a: error: file system with label '~a' not found~%")
(file-system-location* fs) label))))
labeled)
(for-each (lambda (fs)
(unless (find-partition-by-uuid (file-system-device fs))
(error (G_ "~a: error: file system with UUID '~a' not found~%")
(file-system-location* fs)
(uuid->string (file-system-device fs)))))
uuid)
(when fail?
;; Better be safe than sorry.
(exit 1))))
(define (check-mapped-devices os)
"Check that each of MAPPED-DEVICES is valid according to the 'check'
procedure of its type."
(define boot-mapped-devices
(operating-system-boot-mapped-devices os))
(define (needed-for-boot? md)
(memq md boot-mapped-devices))
(define initrd-modules
(operating-system-initrd-modules os))
(for-each (lambda (md)
(let ((check (mapped-device-kind-check
(mapped-device-type md))))
;; We expect CHECK to raise an exception with a detailed
;; '&message' if something goes wrong.
(check md
#:needed-for-boot? (needed-for-boot? md)
#:initrd-modules initrd-modules)))
(operating-system-mapped-devices os)))
(define (check-initrd-modules os)
"Check that modules needed by 'needed-for-boot' file systems in OS are
available in the initrd. Note that mapped devices are responsible for
checking this by themselves in their 'check' procedure."
(define (file-system-/dev fs)
(let ((device (file-system-device fs)))
(match device
((? string?)
device)
((? uuid?)
(find-partition-by-uuid device))
((? file-system-label?)
(find-partition-by-label (file-system-label->string device))))))
(define file-systems
(filter file-system-needed-for-boot?
(operating-system-file-systems os)))
(for-each (lambda (fs)
(check-device-initrd-modules (file-system-/dev fs)
(operating-system-initrd-modules os)
(source-properties->location
(file-system-location fs))))
file-systems))
;;;
;;; Action.
;;;
(define* (system-derivation-for-action os base-image action
#:key image-size file-system-type
full-boot? container-shared-network?
mappings)
"Return as a monadic value the derivation for OS according to ACTION."
(case action
((build init reconfigure)
(operating-system-derivation os))
((container)
(container-script
os
#:mappings mappings
#:shared-network? container-shared-network?))
((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
(if full-boot?
image-size
(* 70 (expt 2 20)))
#:mappings mappings))
((disk-image)
(lower-object
(system-image
(image
(inherit base-image)
(size image-size)
(operating-system os)))))
((docker-image)
(system-docker-image os #:shared-network? container-shared-network?))))
(define (maybe-suggest-running-guix-pull)
"Suggest running 'guix pull' if this has never been done before."
;; Check whether we're running a 'guix pull'-provided 'guix' command. When
;; 'current-profile' returns #f, we may be running the globally-installed
;; 'guix' and thus run the risk of deploying an older 'guix'. See
;; <https://lists.gnu.org/archive/html/guix-devel/2014-08/msg00057.html>
(unless (or (current-profile) (getenv "GUIX_UNINSTALLED"))
(warning (G_ "Consider running 'guix pull' before 'reconfigure'.~%"))
(warning (G_ "Failing to do that may downgrade your system!~%"))))
(define (bootloader-installer-script installer
bootloader device target)
"Return a file calling INSTALLER gexp with given BOOTLOADER, DEVICE
and TARGET arguments."
(scheme-file "bootloader-installer"
(with-imported-modules '((gnu build bootloader)
(guix build utils))
#~(begin
(use-modules (gnu build bootloader)
(guix build utils)
(ice-9 binary-ports)
(srfi srfi-34)
(srfi srfi-35))
(guard (c ((message-condition? c) ;XXX: i18n
(format (current-error-port) "error: ~a~%"
(condition-message c))
(exit 1)))
(#$installer #$bootloader #$device #$target)
(info (G_ "bootloader successfully installed on '~a'~%")
#$device))))))
(define (local-eval exp)
"Evaluate EXP, a G-Expression, in-place."
(mlet* %store-monad ((lowered (lower-gexp exp))
(_ (built-derivations (lowered-gexp-inputs lowered))))
(save-load-path-excursion
(set! %load-path (lowered-gexp-load-path lowered))
(set! %load-compiled-path (lowered-gexp-load-compiled-path lowered))
(return (primitive-eval (lowered-gexp-sexp lowered))))))
(define* (perform-action action os
#:key
save-provenance?
skip-safety-checks?
install-bootloader?
dry-run? derivations-only?
use-substitutes? bootloader-target target
image-size file-system-type full-boot?
container-shared-network?
(mappings '())
(gc-root #f))
"Perform ACTION for OS. INSTALL-BOOTLOADER? specifies whether to install
bootloader; BOOTLOADER-TAGET is the target for the bootloader; 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. The root file system is created as a
FILE-SYSTEM-TYPE file system. FULL-BOOT? is used for the 'vm' action; it
determines whether to boot directly to the kernel or to the bootloader.
CONTAINER-SHARED-NETWORK? determines if the container will use a separate
network namespace.
When DERIVATIONS-ONLY? is true, print the derivation file name(s) without
building anything.
When GC-ROOT is a path, also make that path an indirect root of the build
output when building a system derivation, such as a disk image.
When SKIP-SAFETY-CHECKS? is true, skip the file system and initrd module
static checks."
(define println
(cut format #t "~a~%" <>))
(define menu-entries
(if (eq? 'init action)
'()
(map boot-parameters->menu-entry (profile-boot-parameters))))
(define bootloader
(operating-system-bootloader os))
(define bootcfg
(and (memq action '(init reconfigure))
(operating-system-bootcfg os menu-entries)))
(when (eq? action 'reconfigure)
(maybe-suggest-running-guix-pull))
;; Check whether the declared file systems exist. This is better than
;; instantiating a broken configuration. Assume that we can only check if
;; running as root.
(when (and (not skip-safety-checks?)
(memq action '(init reconfigure)))
(check-mapped-devices os)
(when (zero? (getuid))
(check-file-system-availability (operating-system-file-systems os))
(check-initrd-modules os)))
(mlet* %store-monad
((target* (current-target-system))
(image -> (find-image file-system-type target*))
(sys (system-derivation-for-action os image action
#:file-system-type file-system-type
#:image-size image-size
#:full-boot? full-boot?
#:container-shared-network? container-shared-network?
#:mappings mappings))
;; For 'init' and 'reconfigure', always build BOOTCFG, even if
;; --no-bootloader is passed, because we then use it as a GC root.
;; See <http://bugs.gnu.org/21068>.
(drvs (mapm/accumulate-builds lower-object
(if (memq action '(init reconfigure))
(list sys bootcfg)
(list sys))))
(% (if derivations-only?
(return (for-each (compose println derivation-file-name)
drvs))
(built-derivations drvs))))
(if (or dry-run? derivations-only?)
(return #f)
(begin
(for-each (compose println derivation->output-path)
drvs)
(case action
((reconfigure)
(newline)
(format #t (G_ "activating system...~%"))
(mbegin %store-monad
(switch-to-system local-eval os)
(mwhen install-bootloader?
(install-bootloader local-eval bootloader bootcfg
#:target (or target "/"))
(return
(info (G_ "bootloader successfully installed on '~a'~%")
(bootloader-configuration-target bootloader))))
(with-shepherd-error-handling
(upgrade-shepherd-services local-eval os)
(return (format #t (G_ "\
To complete the upgrade, run 'herd restart SERVICE' to stop,
upgrade, and restart each service that was not automatically restarted.\n"))))))
((init)
(newline)
(format #t (G_ "initializing operating system under '~a'...~%")
target)
(install sys (canonicalize-path target)
#:install-bootloader? install-bootloader?
#:bootloader bootloader
#:bootcfg bootcfg))
(else
;; All we had to do was to build SYS and maybe register an
;; indirect GC root.
(let ((output (derivation->output-path sys)))
(mbegin %store-monad
(mwhen gc-root
(register-root* (list output) gc-root))
(return output)))))))))
(define (export-extension-graph os port)
"Export the service extension graph of OS to PORT."
(let* ((services (operating-system-services os))
(system (find (lambda (service)
(eq? (service-kind service) system-service-type))
services)))
(export-graph (list system) (current-output-port)
#:node-type (service-node-type services)
#:reverse-edges? #t)))
(define (export-shepherd-graph os port)
"Export the graph of shepherd services of OS to PORT."
(let* ((services (operating-system-services os))
(pid1 (fold-services services
#:target-type shepherd-root-service-type))
(shepherds (service-value pid1)) ;list of <shepherd-service>
(sinks (filter (lambda (service)
(null? (shepherd-service-requirement service)))
shepherds)))
(export-graph sinks (current-output-port)
#:node-type (shepherd-service-node-type shepherds)
#:reverse-edges? #t)))
;;;
;;; Options.
;;;
(define (show-help)
(display (G_ "Usage: guix system [OPTION ...] ACTION [ARG ...] [FILE]
Build the operating system declared in FILE according to ACTION.
Some ACTIONS support additional ARGS.\n"))
(newline)
(display (G_ "The valid values for ACTION are:\n"))
(newline)
(display (G_ "\
search search for existing service types\n"))
(display (G_ "\
reconfigure switch to a new operating system configuration\n"))
(display (G_ "\
roll-back switch to the previous operating system configuration\n"))
(display (G_ "\
describe describe the current system\n"))
(display (G_ "\
list-generations list the system generations\n"))
(display (G_ "\
switch-generation switch to an existing operating system configuration\n"))
(display (G_ "\
delete-generations delete old system generations\n"))
(display (G_ "\
build build the operating system without installing anything\n"))
(display (G_ "\
container build a container that shares the host's store\n"))
(display (G_ "\
vm build a virtual machine image that shares the host's store\n"))
(display (G_ "\
vm-image build a freestanding virtual machine image\n"))
(display (G_ "\
disk-image build a disk image, suitable for a USB stick\n"))
(display (G_ "\
docker-image build a Docker image\n"))
(display (G_ "\
init initialize a root file system to run GNU\n"))
(display (G_ "\
extension-graph emit the service extension graph in Dot format\n"))
(display (G_ "\
shepherd-graph emit the graph of shepherd services in Dot format\n"))
(show-build-options-help)
(display (G_ "
-d, --derivation return the derivation of the given system"))
(display (G_ "
-e, --expression=EXPR consider the operating-system EXPR evaluates to
instead of reading FILE, when applicable"))
(display (G_ "
--on-error=STRATEGY
apply STRATEGY (one of nothing-special, backtrace,
or debug) when an error occurs while reading FILE"))
(display (G_ "
--file-system-type=TYPE
for 'disk-image', produce a root file system of TYPE
(one of 'ext4', 'iso9660')"))
(display (G_ "
--image-size=SIZE for 'vm-image', produce an image of SIZE"))
(display (G_ "
--no-bootloader for 'init', do not install a bootloader"))
(display (G_ "
--save-provenance save provenance information"))
(display (G_ "
--share=SPEC for 'vm', share host file system according to SPEC"))
(display (G_ "
--expose=SPEC for 'vm', expose host file system according to SPEC"))
(display (G_ "
-N, --network for 'container', allow containers to access the network"))
(display (G_ "
-r, --root=FILE for 'vm', 'vm-image', 'disk-image', 'container',
and 'build', make FILE a symlink to the result, and
register it as a garbage collector root"))
(display (G_ "
--full-boot for 'vm', make a full boot sequence"))
(display (G_ "
--skip-checks skip file system and initrd module safety checks"))
(display (G_ "
--target=TRIPLET cross-build for TRIPLET--e.g., \"armel-linux-gnu\""))
(display (G_ "
-v, --verbosity=LEVEL use the given verbosity LEVEL"))
(newline)
(display (G_ "
-h, --help display this help and exit"))
(display (G_ "
-V, --version display version information and exit"))
(newline)
(show-bug-report-information))
(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 '(#\e "expression") #t #f
(lambda (opt name arg result)
(alist-cons 'expression arg result)))
(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 '(#\t "file-system-type") #t #f
(lambda (opt name arg result)
(alist-cons 'file-system-type arg
result)))
(option '("image-size") #t #f
(lambda (opt name arg result)
(alist-cons 'image-size (size->number arg)
result)))
(option '(#\N "network") #f #f
(lambda (opt name arg result)
(alist-cons 'container-shared-network? #t result)))
(option '("no-bootloader" "no-grub") #f #f
(lambda (opt name arg result)
(alist-cons 'install-bootloader? #f result)))
(option '("full-boot") #f #f
(lambda (opt name arg result)
(alist-cons 'full-boot? #t result)))
(option '("save-provenance") #f #f
(lambda (opt name arg result)
(alist-cons 'save-provenance? #t result)))
(option '("skip-checks") #f #f
(lambda (opt name arg result)
(alist-cons 'skip-safety-checks? #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 '(#\v "verbosity") #t #f
(lambda (opt name arg result)
(let ((level (string->number* arg)))
(alist-cons 'verbosity level
(alist-delete 'verbosity result)))))
(option '(#\s "system") #t #f
(lambda (opt name arg result)
(alist-cons 'system arg
(alist-delete 'system result eq?))))
(option '("target") #t #f
(lambda (opt name arg result)
(alist-cons 'target arg
(alist-delete 'target result eq?))))
(option '(#\r "root") #t #f
(lambda (opt name arg result)
(alist-cons 'gc-root arg result)))
%standard-build-options))
(define %default-options
;; Alist of default option values.
`((system . ,(%current-system))
(target . #f)
(substitutes? . #t)
(offload? . #t)
(print-build-trace? . #t)
(print-extended-build-trace? . #t)
(multiplexed-build-output? . #t)
(graft? . #t)
(debug . 0)
(verbosity . #f) ;default
(file-system-type . "ext4")
(image-size . guess)
(install-bootloader? . #t)))
;;;
;;; Entry point.
;;;
(define (process-action action args opts)
"Process ACTION, a sub-command, with the arguments are listed in ARGS.
ACTION must be one of the sub-commands that takes an operating system
declaration as an argument (a file name.) OPTS is the raw alist of options
resulting from command-line parsing."
(define (ensure-operating-system file-or-exp obj)
(unless (operating-system? obj)
(leave (G_ "'~a' does not return an operating system~%")
file-or-exp))
obj)
(define save-provenance?
(or (assoc-ref opts 'save-provenance?)
(memq action '(init reconfigure))))
(let* ((file (match args
(() #f)
((x . _) x)))
(expr (assoc-ref opts 'expression))
(system (assoc-ref opts 'system))
(target (assoc-ref opts 'target))
(transform (if save-provenance?
(cut operating-system-with-provenance <> file)
identity))
(os (transform
(ensure-operating-system
(or file expr)
(cond
((and expr file)
(leave
(G_ "both file and expression cannot be specified~%")))
(expr
(read/eval expr))
(file
(load* file %user-module
#:on-error (assoc-ref opts 'on-error)))
(else
(leave (G_ "no configuration specified~%")))))))
(dry? (assoc-ref opts 'dry-run?))
(bootloader? (assoc-ref opts 'install-bootloader?))
(target-file (match args
((first second) second)
(_ #f)))
(bootloader-target
(and bootloader?
(bootloader-configuration-target
(operating-system-bootloader os)))))
(with-store store
(set-build-options-from-command-line store opts)
(with-build-handler (build-notifier #:use-substitutes?
(assoc-ref opts 'substitutes?)
#:dry-run?
(assoc-ref opts 'dry-run?))
(run-with-store store
(mbegin %store-monad
(set-guile-for-build (default-guile))
(case action
((extension-graph)
(export-extension-graph os (current-output-port)))
((shepherd-graph)
(export-shepherd-graph os (current-output-port)))
(else
(unless (memq action '(build init))
(warn-about-old-distro #:suggested-command
"guix system reconfigure"))
(perform-action action os
#:dry-run? dry?
#:derivations-only? (assoc-ref opts
'derivations-only?)
#:use-substitutes? (assoc-ref opts 'substitutes?)
#:skip-safety-checks?
(assoc-ref opts 'skip-safety-checks?)
#:file-system-type (assoc-ref opts 'file-system-type)
#:image-size (assoc-ref opts 'image-size)
#:full-boot? (assoc-ref opts 'full-boot?)
#:container-shared-network?
(assoc-ref opts 'container-shared-network?)
#:mappings (filter-map (match-lambda
(('file-system-mapping . m)
m)
(_ #f))
opts)
#:install-bootloader? bootloader?
#:target target-file
#:bootloader-target bootloader-target
#:gc-root (assoc-ref opts 'gc-root)))))
#:target target
#:system system)))
(warn-about-disk-space)))
(define (resolve-subcommand name)
(let ((module (resolve-interface
`(guix scripts system ,(string->symbol name))))
(proc (string->symbol (string-append "guix-system-" name))))
(module-ref module proc)))
(define (process-command command args opts)
"Process COMMAND, one of the 'guix system' sub-commands. ARGS is its
argument list and OPTS is the option alist."
(define-syntax-rule (with-store* store exp ...)
(with-store store
(set-build-options-from-command-line store opts)
exp ...))
(case command
;; The following commands do not need to use the store, and they do not need
;; an operating system configuration file.
((list-generations)
(let ((pattern (match args
(() #f)
((pattern) pattern)
(x (leave (G_ "wrong number of arguments~%"))))))
(list-generations pattern)))
((describe)
(match (generation-number %system-profile)
(0
(error (G_ "no system generation, nothing to describe~%")))
(generation
(display-system-generation generation))))
((search)
(apply (resolve-subcommand "search") args))
;; The following commands need to use the store, but they do not need an
;; operating system configuration file.
((delete-generations)
(let ((pattern (match args
(() #f)
((pattern) pattern)
(x (leave (G_ "wrong number of arguments~%"))))))
(with-store* store
(delete-matching-generations store %system-profile pattern)
(reinstall-bootloader store (generation-number %system-profile)))))
((switch-generation)
(let ((pattern (match args
((pattern) pattern)
(x (leave (G_ "wrong number of arguments~%"))))))
(with-store* store
(switch-to-system-generation store pattern))))
((roll-back)
(let ((pattern (match args
(() "")
(x (leave (G_ "wrong number of arguments~%"))))))
(with-store* store
(roll-back-system store))))
;; The following commands need to use the store, and they also
;; need an operating system configuration file.
(else (process-action command args opts))))
(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 container vm vm-image disk-image reconfigure init
extension-graph shepherd-graph
list-generations describe
delete-generations roll-back
switch-generation search docker-image)
(alist-cons 'action action result))
(else (leave (G_ "~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))
(expr (assoc-ref opts 'expression)))
(define (fail)
(leave (G_ "wrong number of arguments for action '~a'~%")
action))
(unless action
(format (current-error-port)
(G_ "guix system: missing command name~%"))
(format (current-error-port)
(G_ "Try 'guix system --help' for more information.~%"))
(exit 1))
(case action
((build container vm vm-image disk-image docker-image reconfigure)
(unless (or (= count 1)
(and expr (= count 0)))
(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))
(command (assoc-ref opts 'action)))
(parameterize ((%graft? (assoc-ref opts 'graft?)))
(with-status-verbosity (or (assoc-ref opts 'verbosity)
(if (eq? command 'build) 2 1))
(process-command command args opts))))))
;;; Local Variables:
;;; eval: (put 'with-store* 'scheme-indent-function 1)
;;; End:
;;; system.scm ends here