;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2015 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2016 Chris Marusich <cmmarusich@gmail.com>
;;;
;;; This file is part of GNU Guix.
;;;
#:use-module (guix monads)
#:use-module (guix store)
#:use-module (guix records)
+ #:use-module (guix profiles)
#:use-module (guix sets)
#:use-module (guix ui)
+ #:use-module (guix modules)
#:use-module (gnu packages base)
#:use-module (gnu packages bash)
#:use-module (srfi srfi-1)
#:use-module (ice-9 match)
#:export (service-extension
service-extension?
+ service-extension-target
+ service-extension-compute
service-type
service-type?
service-kind
service-parameters
+ simple-service
modify-services
service-back-edges
fold-services
ambiguous-target-service-error-service
ambiguous-target-service-error-target-type
+ system-service-type
boot-service-type
+ cleanup-service-type
activation-service-type
activation-service->script
+ %linux-bare-metal-service
etc-service-type
etc-directory
setuid-program-service-type
+ profile-service-type
firmware-service-type
+ gc-root-service-type
%boot-service
%activation-service
;;; A service type describe how its instances extend instances of other
;;; service types. For instance, some services extend the instance of
;;; ACCOUNT-SERVICE-TYPE by providing it with accounts and groups to create;
-;;; others extend DMD-ROOT-SERVICE-TYPE by passing it instances of
-;;; <dmd-service>.
+;;; others extend SHEPHERD-ROOT-SERVICE-TYPE by passing it instances of
+;;; <shepherd-service>.
;;;
;;; When applicable, the service type defines how it can itself be extended,
;;; by providing one procedure to compose extensions, and one procedure to
;;; extend itself.
;;;
-;;; A notable service type is BOOT-SERVICE-TYPE, which has a single instance,
-;;; %BOOT-SERVICE. %BOOT-SERVICE constitutes the root of the service DAG. It
-;;; produces the boot script that the initrd loads.
+;;; A notable service type is SYSTEM-SERVICE-TYPE, which has a single
+;;; instance, which is the root of the service DAG. Its value is the
+;;; derivation that produces the 'system' directory as returned by
+;;; 'operating-system-derivation'.
;;;
;;; The 'fold-services' procedure can be passed a list of procedures, which it
;;; "folds" by propagating extensions down the graph; it returns the root
(type service-kind)
(parameters service-parameters))
+(define (simple-service name target value)
+ "Return a service that extends TARGET with VALUE. This works by creating a
+singleton service type NAME, of which the returned service is an instance."
+ (let* ((extension (service-extension target identity))
+ (type (service-type (name name)
+ (extensions (list extension)))))
+ (service type value)))
(define-syntax %modify-service
(syntax-rules (=>)
(define-syntax modify-services
(syntax-rules ()
- "Modify the services listed in SERVICES according to CLAUSES. Each clause
-must have the form:
+ "Modify the services listed in SERVICES according to CLAUSES and return
+the resulting list of services. Each clause must have the form:
(TYPE VARIABLE => BODY)
;;; Core services.
;;;
-(define (compute-boot-script mexps)
+(define (system-derivation mentries mextensions)
+ "Return as a monadic value the derivation of the 'system' directory
+containing the given entries."
+ (mlet %store-monad ((entries mentries)
+ (extensions (sequence %store-monad mextensions)))
+ (lower-object
+ (file-union "system"
+ (append entries (concatenate extensions))))))
+
+(define system-service-type
+ ;; This is the ultimate service type, the root of the service DAG. The
+ ;; service of this type is extended by monadic name/item pairs. These items
+ ;; end up in the "system directory" as returned by
+ ;; 'operating-system-derivation'.
+ (service-type (name 'system)
+ (extensions '())
+ (compose identity)
+ (extend system-derivation)))
+
+(define (compute-boot-script _ mexps)
(mlet %store-monad ((gexps (sequence %store-monad mexps)))
(gexp->file "boot"
- #~(begin
- (use-modules (guix build utils))
-
- ;; Clean out /tmp and /var/run.
- ;;
- ;; XXX This needs to happen before service activations, so
- ;; it has to be here, but this also implicitly assumes
- ;; that /tmp and /var/run are on the root partition.
- (false-if-exception (delete-file-recursively "/tmp"))
- (false-if-exception (delete-file-recursively "/var/run"))
- (false-if-exception (mkdir "/tmp"))
- (false-if-exception (chmod "/tmp" #o1777))
- (false-if-exception (mkdir "/var/run"))
- (false-if-exception (chmod "/var/run" #o755))
-
- ;; Activate the system and spawn dmd.
- #$@gexps))))
+ ;; Clean up and activate the system, then spawn shepherd.
+ #~(begin #$@gexps))))
-(define (second-argument a b) b)
+(define (boot-script-entry mboot)
+ "Return, as a monadic value, an entry for the boot script in the system
+directory."
+ (mlet %store-monad ((boot mboot))
+ (return `(("boot" ,boot)))))
(define boot-service-type
;; The service of this type is extended by being passed gexps as monadic
;; values. It aggregates them in a single script, as a monadic value, which
;; becomes its 'parameters'. It is the only service that extends nothing.
(service-type (name 'boot)
- (extensions '())
- (compose compute-boot-script)
- (extend second-argument)))
+ (extensions
+ (list (service-extension system-service-type
+ boot-script-entry)))
+ (compose append)
+ (extend compute-boot-script)))
(define %boot-service
- ;; This is the ultimate service, the root of the service DAG.
+ ;; The service that produces the boot script.
(service boot-service-type #t))
+(define (cleanup-gexp _)
+ "Return as a monadic value a gexp to clean up /tmp and similar places upon
+boot."
+ (with-monad %store-monad
+ (with-imported-modules '((guix build utils))
+ (return #~(begin
+ (use-modules (guix build utils))
+
+ ;; Clean out /tmp and /var/run.
+ ;;
+ ;; XXX This needs to happen before service activations, so it
+ ;; has to be here, but this also implicitly assumes that /tmp
+ ;; and /var/run are on the root partition.
+ (letrec-syntax ((fail-safe (syntax-rules ()
+ ((_ exp rest ...)
+ (begin
+ (catch 'system-error
+ (lambda () exp)
+ (const #f))
+ (fail-safe rest ...)))
+ ((_)
+ #t))))
+ ;; Ignore I/O errors so the system can boot.
+ (fail-safe
+ (delete-file-recursively "/tmp")
+ (delete-file-recursively "/var/run")
+ (mkdir "/tmp")
+ (chmod "/tmp" #o1777)
+ (mkdir "/var/run")
+ (chmod "/var/run" #o755))))))))
+
+(define cleanup-service-type
+ ;; Service that cleans things up in /tmp and similar.
+ (service-type (name 'cleanup)
+ (extensions
+ (list (service-extension boot-service-type
+ cleanup-gexp)))))
+
(define* (file-union name files) ;FIXME: Factorize.
"Return a <computed-file> that builds a directory containing all of FILES.
Each item in FILES must be a list where the first element is the file name to
(chdir #$output)
#$@(map (match-lambda
((target source)
- #~(symlink #$source #$target)))
+ #~(begin
+ ;; Stat the source to abort early if it
+ ;; does not exist.
+ (stat #$source)
+
+ (symlink #$source #$target))))
files))))
(define (directory-union name things)
one)
(_
(computed-file name
- #~(begin
- (use-modules (guix build union))
- (union-build #$output '#$things))
- #:modules '((guix build union))))))
-
-(define (modprobe-wrapper)
- "Return a wrapper for the 'modprobe' command that knows where modules live.
-
-This wrapper is typically invoked by the Linux kernel ('call_modprobe', in
-kernel/kmod.c), a situation where the 'LINUX_MODULE_DIRECTORY' environment
-variable is not set---hence the need for this wrapper."
- (let ((modprobe "/run/current-system/profile/bin/modprobe"))
- (gexp->script "modprobe"
- #~(begin
- (setenv "LINUX_MODULE_DIRECTORY"
- "/run/booted-system/kernel/lib/modules")
- (apply execl #$modprobe
- (cons #$modprobe (cdr (command-line))))))))
+ (with-imported-modules '((guix build union))
+ #~(begin
+ (use-modules (guix build union))
+ (union-build #$output '#$things)))))))
(define* (activation-service->script service)
"Return as a monadic value the activation script for SERVICE, a service of
(define (activation-script gexps)
"Return the system's activation script, which evaluates GEXPS."
- (define %modules
- '((gnu build activation)
- (gnu build linux-boot)
- (gnu build linux-modules)
- (gnu build file-systems)
- (guix build utils)
- (guix build syscalls)
- (guix elf)))
-
(define (service-activations)
;; Return the activation scripts for SERVICES.
(mapm %store-monad
(cut gexp->file "activate-service" <>)
gexps))
- (mlet* %store-monad ((actions (service-activations))
- (modules (imported-modules %modules))
- (compiled (compiled-modules %modules))
- (modprobe (modprobe-wrapper)))
+ (mlet* %store-monad ((actions (service-activations)))
(gexp->file "activate"
- #~(begin
- (eval-when (expand load eval)
- ;; Make sure 'use-modules' below succeeds.
- (set! %load-path (cons #$modules %load-path))
- (set! %load-compiled-path
- (cons #$compiled %load-compiled-path)))
-
- (use-modules (gnu build activation))
-
- ;; Make sure /bin/sh is valid and current.
- (activate-/bin/sh
- (string-append #$(canonical-package bash) "/bin/sh"))
+ (with-imported-modules (source-module-closure
+ '((gnu build activation)))
+ #~(begin
+ (use-modules (gnu build activation))
- ;; Tell the kernel to use our 'modprobe' command.
- (activate-modprobe #$modprobe)
+ ;; Make sure /bin/sh is valid and current.
+ (activate-/bin/sh
+ (string-append #$(canonical-package bash) "/bin/sh"))
- ;; Let users debug their own processes!
- (activate-ptrace-attach)
+ ;; Make sure the user accounting database exists. If it
+ ;; does not exist, 'setutxent' does not create it and
+ ;; thus there is no accounting at all.
+ (close-port (open-file "/var/run/utmpx" "a0"))
- ;; Run the services' activation snippets.
- ;; TODO: Use 'load-compiled'.
- (for-each primitive-load '#$actions)
+ ;; Set up /run/current-system. Among other things this
+ ;; sets up locales, which the activation snippets
+ ;; executed below may expect.
+ (activate-current-system)
- ;; Set up /run/current-system.
- (activate-current-system)))))
+ ;; Run the services' activation snippets.
+ ;; TODO: Use 'load-compiled'.
+ (for-each primitive-load '#$actions))))))
(define (gexps->activation-gexp gexps)
"Return a gexp that runs the activation script containing GEXPS."
(mlet %store-monad ((script (activation-script gexps)))
(return #~(primitive-load #$script))))
+(define (second-argument a b) b)
+
(define activation-service-type
(service-type (name 'activate)
(extensions
;; receives.
(service activation-service-type #t))
+(define %modprobe-wrapper
+ ;; Wrapper for the 'modprobe' command that knows where modules live.
+ ;;
+ ;; This wrapper is typically invoked by the Linux kernel ('call_modprobe',
+ ;; in kernel/kmod.c), a situation where the 'LINUX_MODULE_DIRECTORY'
+ ;; environment variable is not set---hence the need for this wrapper.
+ (let ((modprobe "/run/current-system/profile/bin/modprobe"))
+ (program-file "modprobe"
+ #~(begin
+ (setenv "LINUX_MODULE_DIRECTORY"
+ "/run/booted-system/kernel/lib/modules")
+ (apply execl #$modprobe
+ (cons #$modprobe (cdr (command-line))))))))
+
+(define %linux-kernel-activation
+ ;; Activation of the Linux kernel running on the bare metal (as opposed to
+ ;; running in a container.)
+ #~(begin
+ ;; Tell the kernel to use our 'modprobe' command.
+ (activate-modprobe #$%modprobe-wrapper)
+
+ ;; Let users debug their own processes!
+ (activate-ptrace-attach)))
+
+(define linux-bare-metal-service-type
+ (service-type (name 'linux-bare-metal)
+ (extensions
+ (list (service-extension activation-service-type
+ (const %linux-kernel-activation))))))
+
+(define %linux-bare-metal-service
+ ;; The service that does things that are needed on the "bare metal", but not
+ ;; necessary or impossible in a container.
+ (service linux-bare-metal-service-type #f))
+
(define (etc-directory service)
"Return the directory for SERVICE, a service of type ETC-SERVICE-TYPE."
(files->etc-directory (service-parameters service)))
(define (files->etc-directory files)
(file-union "etc" files))
+(define (etc-entry files)
+ "Return an entry for the /etc directory consisting of FILES in the system
+directory."
+ (with-monad %store-monad
+ (return `(("etc" ,(files->etc-directory files))))))
+
(define etc-service-type
(service-type (name 'etc)
(extensions
(lambda (files)
(let ((etc
(files->etc-directory files)))
- #~(activate-etc #$etc))))))
+ #~(activate-etc #$etc))))
+ (service-extension system-service-type etc-entry)))
(compose concatenate)
(extend append)))
(compose concatenate)
(extend append)))
+(define (packages->profile-entry packages)
+ "Return a system entry for the profile containing PACKAGES."
+ (mlet %store-monad ((profile (profile-derivation
+ (packages->manifest
+ (delete-duplicates packages eq?)))))
+ (return `(("profile" ,profile)))))
+
+(define profile-service-type
+ ;; The service that populates the system's profile---i.e.,
+ ;; /run/current-system/profile. It is extended by package lists.
+ (service-type (name 'profile)
+ (extensions
+ (list (service-extension system-service-type
+ packages->profile-entry)))
+ (compose concatenate)
+ (extend append)))
+
(define (firmware->activation-gexp firmware)
"Return a gexp to make the packages listed in FIRMWARE loadable by the
kernel."
(compose concatenate)
(extend append)))
+(define (gc-roots->system-entry roots)
+ "Return an entry in the system's output containing symlinks to ROOTS."
+ (mlet %store-monad ((entry (gexp->derivation
+ "gc-roots"
+ #~(let ((roots '#$roots))
+ (mkdir #$output)
+ (chdir #$output)
+ (for-each symlink
+ roots
+ (map number->string
+ (iota (length roots))))))))
+ (return (if (null? roots)
+ '()
+ `(("gc-roots" ,entry))))))
+
+(define gc-root-service-type
+ ;; A service to associate extra garbage-collector roots to the system. This
+ ;; is a simple hack that guarantees that the system retains references to
+ ;; the given list of roots. Roots must be "lowerable" objects like
+ ;; packages, or derivations.
+ (service-type (name 'gc-roots)
+ (extensions
+ (list (service-extension system-service-type
+ gc-roots->system-entry)))
+ (compose concatenate)
+ (extend append)))
+
\f
;;;
;;; Service folding.
(lambda (node)
(reverse (vhash-foldq* cons '() node edges)))))
-(define* (fold-services services #:key (target-type boot-service-type))
+(define* (fold-services services
+ #:key (target-type system-service-type))
"Fold SERVICES by propagating their extensions down to the root of type
TARGET-TYPE; return the root service adjusted accordingly."
(define dependents
HCoop / jackhill / guix / guix.git / blobdiff