diff options
Diffstat (limited to 'gnu/services.scm')
| -rw-r--r-- | gnu/services.scm | 179 |
1 files changed, 146 insertions, 33 deletions
diff --git a/gnu/services.scm b/gnu/services.scm index d0fe0ade17..0e1c74bda8 100644 --- a/gnu/services.scm +++ b/gnu/services.scm @@ -21,6 +21,7 @@ #: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 (gnu packages base) @@ -48,6 +49,7 @@ service-kind service-parameters + modify-services service-back-edges fold-services @@ -59,12 +61,15 @@ ambiguous-target-service-error-service ambiguous-target-service-error-target-type + system-service-type boot-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 %boot-service @@ -87,9 +92,10 @@ ;;; 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 @@ -133,13 +139,73 @@ (parameters service-parameters)) +(define-syntax %modify-service + (syntax-rules (=>) + ((_ service) + service) + ((_ svc (kind param => exp ...) clauses ...) + (if (eq? (service-kind svc) kind) + (let ((param (service-parameters svc))) + (service (service-kind svc) + (begin exp ...))) + (%modify-service svc clauses ...))))) + +(define-syntax modify-services + (syntax-rules () + "Modify the services listed in SERVICES according to CLAUSES. Each clause +must have the form: + + (TYPE VARIABLE => BODY) + +where TYPE is a service type, such as 'guix-service-type', and VARIABLE is an +identifier that is bound within BODY to the value of the service of that +TYPE. Consider this example: + + (modify-services %base-services + (guix-service-type config => + (guix-configuration + (inherit config) + (use-substitutes? #f) + (extra-options '(\"--gc-keep-derivations\")))) + (mingetty-service-type config => + (mingetty-configuration + (inherit config) + (motd (plain-file \"motd\" \"Hi there!\"))))) + +It changes the configuration of the GUIX-SERVICE-TYPE instance, and that of +all the MINGETTY-SERVICE-TYPE instances. + +This is a shorthand for (map (lambda (svc) ...) %base-services)." + ((_ services clauses ...) + (map (lambda (service) + (%modify-service service clauses ...)) + services)))) ;;; ;;; 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 @@ -160,19 +226,25 @@ ;; Activate the system and spawn dmd. #$@gexps)))) -(define (second-argument a b) b) +(define (boot-script-entry mboot) + "Return, as a monadic value, an entry for the boot script in the system +directory." + (mlet %store-monad ((boot mboot)) + (return `(("boot" ,boot))))) (define boot-service-type ;; The service of this type is extended by being passed gexps as monadic ;; values. It aggregates them in a single script, as a monadic value, which ;; becomes its 'parameters'. It is the only service that extends nothing. (service-type (name 'boot) - (extensions '()) - (compose compute-boot-script) - (extend second-argument))) + (extensions + (list (service-extension system-service-type + boot-script-entry))) + (compose append) + (extend compute-boot-script))) (define %boot-service - ;; This is the ultimate service, the root of the service DAG. + ;; The service that produces the boot script. (service boot-service-type #t)) (define* (file-union name files) ;FIXME: Factorize. @@ -202,20 +274,6 @@ file." (union-build #$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 #$modprobe (cdr (command-line)))))))) - (define* (activation-service->script service) "Return as a monadic value the activation script for SERVICE, a service of ACTIVATION-SCRIPT-TYPE." @@ -240,8 +298,7 @@ ACTIVATION-SCRIPT-TYPE." (mlet* %store-monad ((actions (service-activations)) (modules (imported-modules %modules)) - (compiled (compiled-modules %modules)) - (modprobe (modprobe-wrapper))) + (compiled (compiled-modules %modules))) (gexp->file "activate" #~(begin (eval-when (expand load eval) @@ -256,12 +313,6 @@ ACTIVATION-SCRIPT-TYPE." (activate-/bin/sh (string-append #$(canonical-package bash) "/bin/sh")) - ;; Tell the kernel to use our 'modprobe' command. - (activate-modprobe #$modprobe) - - ;; Let users debug their own processes! - (activate-ptrace-attach) - ;; Run the services' activation snippets. ;; TODO: Use 'load-compiled'. (for-each primitive-load '#$actions) @@ -274,6 +325,8 @@ ACTIVATION-SCRIPT-TYPE." (mlet %store-monad ((script (activation-script gexps))) (return #~(primitive-load #$script)))) +(define (second-argument a b) b) + (define activation-service-type (service-type (name 'activate) (extensions @@ -287,6 +340,41 @@ ACTIVATION-SCRIPT-TYPE." ;; receives. (service activation-service-type #t)) +(define %modprobe-wrapper + ;; Wrapper for the 'modprobe' command that knows where modules live. + ;; + ;; This wrapper is typically invoked by the Linux kernel ('call_modprobe', + ;; in kernel/kmod.c), a situation where the 'LINUX_MODULE_DIRECTORY' + ;; environment variable is not set---hence the need for this wrapper. + (let ((modprobe "/run/current-system/profile/bin/modprobe")) + (program-file "modprobe" + #~(begin + (setenv "LINUX_MODULE_DIRECTORY" + "/run/booted-system/kernel/lib/modules") + (apply execl #$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))) @@ -294,6 +382,12 @@ ACTIVATION-SCRIPT-TYPE." (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 @@ -302,7 +396,8 @@ ACTIVATION-SCRIPT-TYPE." (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))) @@ -321,6 +416,23 @@ FILES must be a list of name/file-like object pairs." (compose concatenate) (extend append))) +(define (packages->profile-entry packages) + "Return a system entry for the profile containing PACKAGES." + (mlet %store-monad ((profile (profile-derivation + (manifest (map package->manifest-entry + (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." @@ -393,7 +505,8 @@ kernel." (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 |