;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2015, 2016, 2017, 2018, 2019, 2020 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2016 Chris Marusich <cmmarusich@gmail.com>
+;;; Copyright © 2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+;;; Copyright © 2020, 2021 Ricardo Wurmus <rekado@elephly.net>
;;;
;;; This file is part of GNU Guix.
;;;
#:use-module (guix records)
#:use-module (guix profiles)
#:use-module (guix discovery)
+ #:use-module (guix combinators)
+ #:use-module (guix channels)
+ #:use-module (guix describe)
#:use-module (guix sets)
#:use-module (guix ui)
- #:use-module ((guix utils) #:select (source-properties->location))
+ #:use-module (guix diagnostics)
+ #:autoload (guix openpgp) (openpgp-format-fingerprint)
#:use-module (guix modules)
#:use-module (gnu packages base)
#:use-module (gnu packages bash)
+ #:use-module (gnu packages hurd)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-9)
#:use-module (srfi srfi-9 gnu)
#:use-module (srfi srfi-35)
#:use-module (ice-9 vlist)
#:use-module (ice-9 match)
+ #:autoload (ice-9 pretty-print) (pretty-print)
#:export (service-extension
service-extension?
service-extension-target
simple-service
modify-services
service-back-edges
+ instantiate-missing-services
fold-services
service-error?
ambiguous-target-service-error-target-type
system-service-type
+ provenance-service-type
+ sexp->system-provenance
+ system-provenance
boot-service-type
cleanup-service-type
activation-service-type
activation-service->script
%linux-bare-metal-service
+ %hurd-rc-script
+ %hurd-startup-service
special-files-service-type
extra-special-file
etc-service-type
%boot-service
%activation-service
- etc-service))
+ etc-service)
+ #:re-export (;; Note: Re-export 'delete' to allow for proper syntax matching
+ ;; in 'modify-services' forms. See
+ ;; <https://debbugs.gnu.org/cgi/bugreport.cgi?bug=26805#16>.
+ delete))
;;; Comment:
;;;
(define (all-service-modules)
"Return the default set of service modules."
(cons (resolve-interface '(gnu services))
- (all-modules (%service-type-path))))
+ (all-modules (%service-type-path)
+ #:warn warn-about-load-error)))
(define* (fold-service-types proc seed
#:optional
(if (eq? default &no-default-value)
(let ((location (source-properties->location location)))
(raise
- (condition
- (&missing-value-service-error (type type) (location location))
- (&message
- (message (format #f (G_ "~a: no value specified \
+ (make-compound-condition
+ (condition
+ (&missing-value-service-error (type type) (location location)))
+ (formatted-message (G_ "~a: no value specified \
for service of type '~a'")
- (location->string location)
- (service-type-name type)))))))
+ (location->string location)
+ (service-type-name type)))))
(service type default))))
(define-condition-type &service-error &error
(service type value)))
(define-syntax %modify-service
- (syntax-rules (=>)
+ (syntax-rules (=> delete)
+ ((_ svc (delete kind) clauses ...)
+ (if (eq? (service-kind svc) kind)
+ #f
+ (%modify-service svc clauses ...)))
((_ service)
service)
((_ svc (kind param => exp ...) clauses ...)
(mingetty-service-type config =>
(mingetty-configuration
(inherit config)
- (motd (plain-file \"motd\" \"Hi there!\")))))
+ (motd (plain-file \"motd\" \"Hi there!\"))))
+ (delete udev-service-type))
It changes the configuration of the GUIX-SERVICE-TYPE instance, and that of
-all the MINGETTY-SERVICE-TYPE instances.
+all the MINGETTY-SERVICE-TYPE instances, and it deletes instances of the
+UDEV-SERVICE-TYPE.
-This is a shorthand for (map (lambda (svc) ...) %base-services)."
+This is a shorthand for (filter-map (lambda (svc) ...) %base-services)."
((_ services clauses ...)
- (map (lambda (service)
- (%modify-service service clauses ...))
- services))))
+ (filter-map (lambda (service)
+ (%modify-service service clauses ...))
+ services))))
\f
;;;
;;; Core services.
;;;
-(define (system-derivation mentries mextensions)
+(define (system-derivation entries 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)))
+ (mlet %store-monad ((extensions (mapm/accumulate-builds identity
+ mextensions)))
(lower-object
(file-union "system"
(append entries (concatenate extensions))))))
(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"
- ;; Clean up and activate the system, then spawn shepherd.
- #~(begin #$@gexps))))
+ (extend system-derivation)
+ (description
+ "Build the operating system top-level directory, which in
+turn refers to everything the operating system needs: its kernel, initrd,
+system profile, boot script, and so on.")))
+
+(define (compute-boot-script _ gexps)
+ ;; Reverse GEXPS so that extensions appear in the boot script in the right
+ ;; order. That is, user extensions would come first, and extensions added
+ ;; by 'essential-services' (e.g., running shepherd) are guaranteed to come
+ ;; last.
+ (gexp->file "boot"
+ ;; Clean up and activate the system, then spawn shepherd.
+ #~(begin #$@(reverse gexps))))
(define (boot-script-entry mboot)
"Return, as a monadic value, an entry for the boot script in the system
(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.
+ ;; The service of this type is extended by being passed gexps. It
+ ;; aggregates them in a single script, as a monadic value, which becomes its
+ ;; value.
(service-type (name 'boot)
(extensions
(list (service-extension system-service-type
boot-script-entry)))
- (compose append)
- (extend compute-boot-script)))
+ (compose identity)
+ (extend compute-boot-script)
+ (description
+ "Produce the operating system's boot script, which is spawned
+by the initrd once the root file system is mounted.")))
(define %boot-service
;; The service that produces the boot script.
(service boot-service-type #t))
+\f
+;;;
+;;; Provenance tracking.
+;;;
+
+(define (object->pretty-string obj)
+ "Like 'object->string', but using 'pretty-print'."
+ (call-with-output-string
+ (lambda (port)
+ (pretty-print obj port))))
+
+(define (channel->code channel)
+ "Return code to build CHANNEL, ready to be dropped in a 'channels.scm'
+file."
+ ;; Since the 'introduction' field is backward-incompatible, and since it's
+ ;; optional when using the "official" 'guix channel, include it if and only
+ ;; if we're referring to a different channel.
+ (let ((intro (and (not (equal? (list channel) %default-channels))
+ (channel-introduction channel))))
+ `(channel (name ',(channel-name channel))
+ (url ,(channel-url channel))
+ (branch ,(channel-branch channel))
+ (commit ,(channel-commit channel))
+ ,@(if intro
+ `((introduction
+ (make-channel-introduction
+ ,(channel-introduction-first-signed-commit intro)
+ (openpgp-fingerprint
+ ,(openpgp-format-fingerprint
+ (channel-introduction-first-commit-signer
+ intro))))))
+ '()))))
+
+(define (channel->sexp channel)
+ "Return an sexp describing CHANNEL. The sexp is _not_ code and is meant to
+be parsed by tools; it's potentially more future-proof than code."
+ ;; TODO: Add CHANNEL's introduction. Currently we can't do that because
+ ;; older 'guix system describe' expect exactly name/url/branch/commit
+ ;; without any additional fields.
+ `(channel (name ,(channel-name channel))
+ (url ,(channel-url channel))
+ (branch ,(channel-branch channel))
+ (commit ,(channel-commit channel))))
+
+(define (sexp->channel sexp)
+ "Return the channel corresponding to SEXP, an sexp as found in the
+\"provenance\" file produced by 'provenance-service-type'."
+ (match sexp
+ (('channel ('name name)
+ ('url url)
+ ('branch branch)
+ ('commit commit)
+ rest ...)
+ ;; XXX: In the future REST may include a channel introduction.
+ (channel (name name) (url url)
+ (branch branch) (commit commit)))))
+
+(define (provenance-file channels config-file)
+ "Return a 'provenance' file describing CHANNELS, a list of channels, and
+CONFIG-FILE, which can be either #f or a <local-file> containing the OS
+configuration being used."
+ (scheme-file "provenance"
+ #~(provenance
+ (version 0)
+ (channels #+@(if channels
+ (map channel->sexp channels)
+ '()))
+ (configuration-file #+config-file))))
+
+(define (provenance-entry config-file)
+ "Return system entries describing the operating system provenance: the
+channels in use and CONFIG-FILE, if it is true."
+ (define profile
+ (current-profile))
+
+ (define channels
+ (and=> profile profile-channels))
+
+ (mbegin %store-monad
+ (let ((config-file (cond ((string? config-file)
+ ;; CONFIG-FILE has been passed typically via
+ ;; 'guix system reconfigure CONFIG-FILE' so we
+ ;; can assume it's valid: tell 'local-file' to
+ ;; not emit a warning.
+ (local-file (assume-valid-file-name config-file)
+ "configuration.scm"))
+ ((not config-file)
+ #f)
+ (else
+ config-file))))
+ (return `(("provenance" ,(provenance-file channels config-file))
+ ,@(if channels
+ `(("channels.scm"
+ ,(plain-file "channels.scm"
+ (object->pretty-string
+ `(list
+ ,@(map channel->code channels))))))
+ '())
+ ,@(if config-file
+ `(("configuration.scm" ,config-file))
+ '()))))))
+
+(define provenance-service-type
+ (service-type (name 'provenance)
+ (extensions
+ (list (service-extension system-service-type
+ provenance-entry)))
+ (default-value #f) ;the OS config file
+ (description
+ "Store provenance information about the system in the system
+itself: the channels used when building the system, and its configuration
+file, when available.")))
+
+(define (sexp->system-provenance sexp)
+ "Parse SEXP, an s-expression read from /run/current-system/provenance or
+similar, and return two values: the list of channels listed therein, and the
+OS configuration file or #f."
+ (match sexp
+ (('provenance ('version 0)
+ ('channels channels ...)
+ ('configuration-file config-file))
+ (values (map sexp->channel channels)
+ config-file))
+ (_
+ (values '() #f))))
+
+(define (system-provenance system)
+ "Given SYSTEM, the file name of a system generation, return two values: the
+list of channels SYSTEM is built from, and its configuration file. If that
+information is missing, return the empty list (for channels) and possibly
+#false (for the configuration file)."
+ (catch 'system-error
+ (lambda ()
+ (sexp->system-provenance
+ (call-with-input-file (string-append system "/provenance")
+ read)))
+ (lambda _
+ (values '() #f))))
+\f
+;;;
+;;; Cleanup.
+;;;
+
(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
- ;; Remove stale Shadow lock files as they would lead to
- ;; failures of 'useradd' & co.
- (delete-file "/etc/group.lock")
- (delete-file "/etc/passwd.lock")
- (delete-file "/etc/.pwd.lock") ;from 'lckpwdf'
-
- (delete-file-recursively "/tmp")
- (delete-file-recursively "/var/run")
- (mkdir "/tmp")
- (chmod "/tmp" #o1777)
- (mkdir "/var/run")
- (chmod "/var/run" #o755))))))))
+ "Return a gexp to clean up /tmp and similar places upon boot."
+ (with-imported-modules '((guix build utils))
+ #~(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
+ ;; Remove stale Shadow lock files as they would lead to
+ ;; failures of 'useradd' & co.
+ (delete-file "/etc/group.lock")
+ (delete-file "/etc/passwd.lock")
+ (delete-file "/etc/.pwd.lock") ;from 'lckpwdf'
+
+ ;; Force file names to be decoded as UTF-8. See
+ ;; <https://bugs.gnu.org/26353>.
+ (setenv "GUIX_LOCPATH"
+ #+(file-append glibc-utf8-locales "/lib/locale"))
+ (setlocale LC_CTYPE "en_US.utf8")
+ (delete-file-recursively "/tmp")
+ (delete-file-recursively "/var/run")
+
+ (mkdir "/tmp")
+ (chmod "/tmp" #o1777)
+ (mkdir "/var/run")
+ (chmod "/var/run" #o755)
+ (delete-file-recursively "/run/udev/watch.old"))))))
(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)))))
+ cleanup-gexp)))
+ (description
+ "Delete files from @file{/tmp}, @file{/var/run}, and other
+temporary locations at boot time.")))
(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 (service-activations)
- ;; Return the activation scripts for SERVICES.
- (mapm %store-monad
- (cut gexp->file "activate-service" <>)
- gexps))
-
- (mlet* %store-monad ((actions (service-activations)))
- (gexp->file "activate"
+ (define actions
+ (map (cut program-file "activate-service.scm" <>) gexps))
+
+ (program-file "activate.scm"
(with-imported-modules (source-module-closure
'((gnu build activation)
(guix build utils)))
;; Run the services' activation snippets.
;; TODO: Use 'load-compiled'.
- (for-each primitive-load '#$actions))))))
+ (for-each primitive-load '#$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 #$script))))
+ #~(primitive-load #$(activation-script gexps)))
+
+(define (activation-profile-entry gexps)
+ "Return, as a monadic value, an entry for the activation script in the
+system directory."
+ (mlet %store-monad ((activate (lower-object (activation-script gexps))))
+ (return `(("activate" ,activate)))))
(define (second-argument a b) b)
(service-type (name 'activate)
(extensions
(list (service-extension boot-service-type
- gexps->activation-gexp)))
- (compose append)
- (extend second-argument)))
+ gexps->activation-gexp)
+ (service-extension system-service-type
+ activation-profile-entry)))
+ (compose identity)
+ (extend second-argument)
+ (description
+ "Run @dfn{activation} code at boot time and upon
+@command{guix system reconfigure} completion.")))
(define %activation-service
;; The activation service produces the activation script from the gexps it
#~(begin
(setenv "LINUX_MODULE_DIRECTORY"
"/run/booted-system/kernel/lib/modules")
+ ;; FIXME: Remove this crutch when the patch #40422,
+ ;; updating to kmod 27 is merged.
+ (setenv "MODPROBE_OPTIONS"
+ "-C /etc/modprobe.d")
(apply execl #$modprobe
(cons #$modprobe (cdr (command-line))))))))
activation-service-type
%linux-kernel-activation))
+(define %hurd-rc-script
+ ;; The RC script to be started upon boot.
+ (program-file "rc"
+ (with-imported-modules (source-module-closure
+ '((guix build utils)
+ (gnu build hurd-boot)
+ (guix build syscalls)))
+ #~(begin
+ (use-modules (guix build utils)
+ (gnu build hurd-boot)
+ (guix build syscalls)
+ (ice-9 match)
+ (system repl repl)
+ (srfi srfi-1)
+ (srfi srfi-26))
+ (boot-hurd-system)))))
+
+(define (hurd-rc-entry rc)
+ "Return, as a monadic value, an entry for the RC script in the system
+directory."
+ (mlet %store-monad ((rc (lower-object rc)))
+ (return `(("rc" ,rc)))))
+
+(define hurd-startup-service-type
+ ;; The service that creates the initial SYSTEM/rc startup file.
+ (service-type (name 'startup)
+ (extensions
+ (list (service-extension system-service-type hurd-rc-entry)))
+ (default-value %hurd-rc-script)))
+
+(define %hurd-startup-service
+ ;; The service that produces the RC script.
+ (service hurd-startup-service-type %hurd-rc-script))
(define special-files-service-type
;; Service to install "special files" such as /bin/sh and /usr/bin/env.
(lambda (files)
#~(activate-special-files '#$files)))))
(compose concatenate)
- (extend append)))
+ (extend append)
+ (description
+ "Add special files to the root file system---e.g.,
+@file{/usr/bin/env}.")))
(define (extra-special-file file target)
"Use TARGET as the \"special file\" FILE. For example, TARGET might be
(files->etc-directory (service-value service)))
(define (files->etc-directory files)
+ (define (assert-no-duplicates files)
+ (let loop ((files files)
+ (seen (set)))
+ (match files
+ (() #t)
+ (((file _) rest ...)
+ (when (set-contains? seen file)
+ (raise (formatted-message (G_ "duplicate '~a' entry for /etc")
+ file)))
+ (loop rest (set-insert file seen))))))
+
+ ;; Detect duplicates early instead of letting them through, eventually
+ ;; leading to a build failure of "etc.drv".
+ (assert-no-duplicates files)
+
(file-union "etc" files))
(define (etc-entry files)
#~(activate-etc #$etc))))
(service-extension system-service-type etc-entry)))
(compose concatenate)
- (extend append)))
+ (extend append)
+ (description "Populate the @file{/etc} directory.")))
(define (etc-service files)
"Return a new service of ETC-SERVICE-TYPE that populates /etc with FILES.
#~(activate-setuid-programs
(list #$@programs))))))
(compose concatenate)
- (extend append)))
+ (extend append)
+ (description
+ "Populate @file{/run/setuid-programs} with the specified
+executables, making them setuid-root.")))
(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)))))
+ ;; XXX: 'mlet' is needed here for one reason: to get the proper
+ ;; '%current-target' and '%current-target-system' bindings when
+ ;; 'packages->manifest' is called, and thus when the 'package-inputs'
+ ;; etc. procedures are called on PACKAGES. That way, conditionals in those
+ ;; inputs see the "correct" value of these two parameters. See
+ ;; <https://issues.guix.gnu.org/44952>.
+ (mlet %store-monad ((_ (current-target-system)))
+ (return `(("profile" ,(profile
+ (content (packages->manifest
+ (delete-duplicates packages eq?)))))))))
(define profile-service-type
;; The service that populates the system's profile---i.e.,
(list (service-extension system-service-type
packages->profile-entry)))
(compose concatenate)
- (extend append)))
+ (extend append)
+ (description
+ "This is the @dfn{system profile}, available as
+@file{/run/current-system/profile}. It contains packages that the sysadmin
+wants to be globally available to all the system users.")))
(define (firmware->activation-gexp firmware)
"Return a gexp to make the packages listed in FIRMWARE loadable by the
(list (service-extension activation-service-type
firmware->activation-gexp)))
(compose concatenate)
- (extend append)))
+ (extend append)
+ (description
+ "Make ``firmware'' files loadable by the operating system
+kernel. Firmware may then be uploaded to some of the machine's devices, such
+as Wifi cards.")))
(define (gc-roots->system-entry roots)
"Return an entry in the system's output containing symlinks to ROOTS."
(list (service-extension system-service-type
gc-roots->system-entry)))
(compose concatenate)
- (extend append)))
+ (extend append)
+ (description
+ "Register garbage-collector roots---i.e., store items that
+will not be reclaimed by the garbage collector.")
+ (default-value '())))
\f
;;;
(service ambiguous-target-service-error-service)
(target-type ambiguous-target-service-error-target-type))
+(define (missing-target-error service target-type)
+ (raise
+ (condition (&missing-target-service-error
+ (service service)
+ (target-type target-type))
+ (&message
+ (message
+ (format #f (G_ "no target of type '~a' for service '~a'")
+ (service-type-name target-type)
+ (service-type-name
+ (service-kind service))))))))
+
(define (service-back-edges services)
"Return a procedure that, when passed a <service>, returns the list of
<service> objects that depend on it."
((target)
(vhash-consq target service edges))
(()
- (raise
- (condition (&missing-target-service-error
- (service service)
- (target-type target-type))
- (&message
- (message
- (format #f (G_ "no target of type '~a' for service '~a'")
- (service-type-name target-type)
- (service-type-name
- (service-kind service))))))))
+ (missing-target-error service target-type))
(x
(raise
(condition (&ambiguous-target-service-error
(lambda (node)
(reverse (vhash-foldq* cons '() node edges)))))
+(define (instantiate-missing-services services)
+ "Return SERVICES, a list, augmented with any services targeted by extensions
+and missing from SERVICES. Only service types with a default value can be
+instantiated; other missing services lead to a
+'&missing-target-service-error'."
+ (define (adjust-service-list svc result instances)
+ (fold2 (lambda (extension result instances)
+ (define target-type
+ (service-extension-target extension))
+
+ (match (vhash-assq target-type instances)
+ (#f
+ (let ((default (service-type-default-value target-type)))
+ (if (eq? &no-default-value default)
+ (missing-target-error svc target-type)
+ (let ((new (service target-type)))
+ (values (cons new result)
+ (vhash-consq target-type new instances))))))
+ (_
+ (values result instances))))
+ result
+ instances
+ (service-type-extensions (service-kind svc))))
+
+ (let loop ((services services))
+ (define instances
+ (fold (lambda (service result)
+ (vhash-consq (service-kind service) service
+ result))
+ vlist-null services))
+
+ (define adjusted
+ (fold2 adjust-service-list
+ services instances
+ services))
+
+ ;; If we instantiated services, they might in turn depend on missing
+ ;; services. Loop until we've reached fixed point.
+ (if (= (length adjusted) (vlist-length instances))
+ adjusted
+ (loop adjusted))))
+
(define* (fold-services services
#:key (target-type system-service-type))
"Fold SERVICES by propagating their extensions down to the root of type
(eq? (service-kind service) target-type))
services)
((sink)
- (let loop ((sink sink))
- (let* ((dependents (map loop (dependents sink)))
- (extensions (map (apply-extension sink) dependents))
- (extend (service-type-extend (service-kind sink)))
- (compose (service-type-compose (service-kind sink)))
- (params (service-value sink)))
- ;; We distinguish COMPOSE and EXTEND because PARAMS typically has a
- ;; different type than the elements of EXTENSIONS.
- (if extend
- (service (service-kind sink)
- (extend params (compose extensions)))
- sink))))
+ ;; Use the state monad to keep track of already-visited services in the
+ ;; graph and to memoize their value once folded.
+ (run-with-state
+ (let loop ((sink sink))
+ (mlet %state-monad ((visited (current-state)))
+ (match (vhash-assq sink visited)
+ (#f
+ (mlet* %state-monad
+ ((dependents (mapm %state-monad loop (dependents sink)))
+ (visited (current-state))
+ (extensions -> (map (apply-extension sink) dependents))
+ (extend -> (service-type-extend (service-kind sink)))
+ (compose -> (service-type-compose (service-kind sink)))
+ (params -> (service-value sink))
+ (service
+ ->
+ ;; Distinguish COMPOSE and EXTEND because PARAMS typically
+ ;; has a different type than the elements of EXTENSIONS.
+ (if extend
+ (service (service-kind sink)
+ (extend params (compose extensions)))
+ sink)))
+ (mbegin %state-monad
+ (set-current-state (vhash-consq sink service visited))
+ (return service))))
+ ((_ . service) ;SINK was already visited
+ (return service)))))
+ vlist-null))
(()
(raise
- (condition (&missing-target-service-error
- (service #f)
- (target-type target-type))
- (&message
- (message (format #f (G_ "service of type '~a' not found")
- (service-type-name target-type)))))))
+ (make-compound-condition
+ (condition (&missing-target-service-error
+ (service #f)
+ (target-type target-type)))
+ (formatted-message (G_ "service of type '~a' not found")
+ (service-type-name target-type)))))
(x
(raise
(condition (&ambiguous-target-service-error
HCoop / jackhill / guix / guix.git / blobdiff