;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2015, 2016, 2017, 2018 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2016 Chris Marusich <cmmarusich@gmail.com>
;;;
;;; This file is part of GNU Guix.
#:use-module (guix store)
#:use-module (guix records)
#:use-module (guix profiles)
+ #:use-module (guix discovery)
+ #:use-module (guix combinators)
#:use-module (guix sets)
#:use-module (guix ui)
+ #:use-module ((guix utils) #:select (source-properties->location))
#:use-module (guix modules)
#:use-module (gnu packages base)
#:use-module (gnu packages bash)
service-type-extensions
service-type-compose
service-type-extend
+ service-type-default-value
+ service-type-description
+ service-type-location
+
+ %service-type-path
+ fold-service-types
+ lookup-service-types
service
service?
service-kind
- service-parameters
+ service-value
+ service-parameters ;deprecated
simple-service
modify-services
service-back-edges
+ instantiate-missing-services
fold-services
service-error?
+ missing-value-service-error?
+ missing-value-service-error-type
+ missing-value-service-error-location
missing-target-service-error?
missing-target-service-error-service
missing-target-service-error-target-type
activation-service-type
activation-service->script
%linux-bare-metal-service
+ special-files-service-type
+ extra-special-file
etc-service-type
etc-directory
setuid-program-service-type
%boot-service
%activation-service
- etc-service
-
- file-union)) ;XXX: for lack of a better place
+ etc-service))
;;; Comment:
;;;
(target service-extension-target) ;<service-type>
(compute service-extension-compute)) ;params -> params
+(define &no-default-value
+ ;; Value used to denote service types that have no associated default value.
+ '(no default value))
+
(define-record-type* <service-type> service-type make-service-type
service-type?
(name service-type-name) ;symbol (for debugging)
;; Extend the services' own parameters with the extension composition.
(extend service-type-extend ;list of Any -> parameters
- (default #f)))
+ (default #f))
+
+ ;; Optional default value for instances of this type.
+ (default-value service-type-default-value ;Any
+ (default &no-default-value))
+
+ ;; Meta-data.
+ (description service-type-description ;string
+ (default #f))
+ (location service-type-location ;<location>
+ (default (and=> (current-source-location)
+ source-properties->location))
+ (innate)))
(define (write-service-type type port)
(format port "#<service-type ~a ~a>"
(set-record-type-printer! <service-type> write-service-type)
+(define %distro-root-directory
+ ;; Absolute file name of the module hierarchy.
+ (dirname (search-path %load-path "guix.scm")))
+
+(define %service-type-path
+ ;; Search path for service types.
+ (make-parameter `((,%distro-root-directory . "gnu/services")
+ (,%distro-root-directory . "gnu/system"))))
+
+(define (all-service-modules)
+ "Return the default set of service modules."
+ (cons (resolve-interface '(gnu services))
+ (all-modules (%service-type-path))))
+
+(define* (fold-service-types proc seed
+ #:optional
+ (modules (all-service-modules)))
+ "For each service type exported by one of MODULES, call (PROC RESULT). SEED
+is used as the initial value of RESULT."
+ (fold-module-public-variables (lambda (object result)
+ (if (service-type? object)
+ (proc object result)
+ result))
+ seed
+ modules))
+
+(define lookup-service-types
+ (let ((table
+ (delay (fold-service-types (lambda (type result)
+ (vhash-consq (service-type-name type)
+ type result))
+ vlist-null))))
+ (lambda (name)
+ "Return the list of services with the given NAME (a symbol)."
+ (vhash-foldq* cons '() name (force table)))))
+
;; Services of a given type.
(define-record-type <service>
- (service type parameters)
+ (make-service type value)
service?
(type service-kind)
- (parameters service-parameters))
+ (value service-value))
+
+(define-syntax service
+ (syntax-rules ()
+ "Return a service instance of TYPE. The service value is VALUE or, if
+omitted, TYPE's default value."
+ ((_ type value)
+ (make-service type value))
+ ((_ type)
+ (%service-with-default-value (current-source-location)
+ type))))
+
+(define (%service-with-default-value location type)
+ "Return a instance of service type TYPE with its default value, if any. If
+TYPE does not have a default value, an error is raised."
+ ;; TODO: Currently this is a run-time error but with a little bit macrology
+ ;; we could turn it into an expansion-time error.
+ (let ((default (service-type-default-value type)))
+ (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 \
+for service of type '~a'")
+ (location->string location)
+ (service-type-name type)))))))
+ (service type default))))
+
+(define-condition-type &service-error &error
+ service-error?)
+
+(define-condition-type &missing-value-service-error &service-error
+ missing-value-service-error?
+ (type missing-value-service-error-type)
+ (location missing-value-service-error-location))
+
+
+\f
+;;;
+;;; Helpers.
+;;;
+
+(define service-parameters
+ ;; Deprecated alias.
+ service-value)
(define (simple-service name target value)
"Return a service that extends TARGET with VALUE. This works by creating a
service)
((_ svc (kind param => exp ...) clauses ...)
(if (eq? (service-kind svc) kind)
- (let ((param (service-parameters svc)))
+ (let ((param (service-value svc)))
(service (service-kind svc)
(begin exp ...)))
(%modify-service svc clauses ...)))))
#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))))))))
+ (chmod "/var/run" #o755)
+ (delete-file-recursively "/run/udev/watch.old"))))))))
(define cleanup-service-type
;; Service that cleans things up in /tmp and similar.
(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
-use in the new directory, and the second element is a gexp denoting the target
-file."
- (computed-file name
- #~(begin
- (mkdir #$output)
- (chdir #$output)
- #$@(map (match-lambda
- ((target source)
- #~(begin
- ;; Stat the source to abort early if it
- ;; does not exist.
- (stat #$source)
-
- (symlink #$source #$target))))
- files))))
-
-(define (directory-union name things)
- "Return a directory that is the union of THINGS."
- (match things
- ((one)
- ;; Only one thing; return it.
- one)
- (_
- (computed-file name
- (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
ACTIVATION-SCRIPT-TYPE."
- (activation-script (service-parameters service)))
+ (activation-script (service-value service)))
(define (activation-script gexps)
"Return the system's activation script, which evaluates GEXPS."
(mlet* %store-monad ((actions (service-activations)))
(gexp->file "activate"
(with-imported-modules (source-module-closure
- '((gnu build activation)))
+ '((gnu build activation)
+ (guix build utils)))
#~(begin
- (use-modules (gnu build activation))
-
- ;; Make sure /bin/sh is valid and current.
- (activate-/bin/sh
- (string-append #$(canonical-package bash) "/bin/sh"))
+ (use-modules (gnu build activation)
+ (guix build utils))
;; Make sure the user accounting database exists. If it
;; does not exist, 'setutxent' does not create it and
;; Same for 'wtmp', which is populated by mingetty et
;; al.
+ (mkdir-p "/var/log")
(close-port (open-file "/var/log/wtmp" "a0"))
;; Set up /run/current-system. Among other things this
;; Let users debug their own processes!
(activate-ptrace-attach)))
-(define linux-bare-metal-service-type
- (service-type (name 'linux-bare-metal)
- (extensions
- (list (service-extension activation-service-type
- (const %linux-kernel-activation))))))
-
(define %linux-bare-metal-service
;; The service that does things that are needed on the "bare metal", but not
;; necessary or impossible in a container.
- (service linux-bare-metal-service-type #f))
+ (simple-service 'linux-bare-metal
+ activation-service-type
+ %linux-kernel-activation))
+
+
+(define special-files-service-type
+ ;; Service to install "special files" such as /bin/sh and /usr/bin/env.
+ (service-type
+ (name 'special-files)
+ (extensions
+ (list (service-extension activation-service-type
+ (lambda (files)
+ #~(activate-special-files '#$files)))))
+ (compose concatenate)
+ (extend append)))
+
+(define (extra-special-file file target)
+ "Use TARGET as the \"special file\" FILE. For example, TARGET might be
+ (file-append coreutils \"/bin/env\")
+and FILE could be \"/usr/bin/env\"."
+ (simple-service (string->symbol (string-append "special-file-" file))
+ special-files-service-type
+ `((,file ,target))))
(define (etc-directory service)
"Return the directory for SERVICE, a service of type ETC-SERVICE-TYPE."
- (files->etc-directory (service-parameters service)))
+ (files->etc-directory (service-value service)))
(define (files->etc-directory files)
(file-union "etc" files))
;;; Service folding.
;;;
-(define-condition-type &service-error &error
- service-error?)
-
(define-condition-type &missing-target-service-error &service-error
missing-target-service-error?
(service missing-target-service-error-service)
(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 (_ "no target of type '~a' for service ~s")
- (service-type-name target-type)
- service))))))
+ (missing-target-error service target-type))
(x
(raise
(condition (&ambiguous-target-service-error
(&message
(message
(format #f
- (_ "more than one target service of type '~a'")
+ (G_ "more than one target service of type '~a'")
(service-type-name target-type))))))))))
(fold add-edge edges (service-type-extensions (service-kind service))))
(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 ((instances (fold (lambda (service result)
+ (vhash-consq (service-kind service) service
+ result))
+ vlist-null services)))
+ (fold2 adjust-service-list
+ services instances
+ services)))
+
(define* (fold-services services
#:key (target-type system-service-type))
"Fold SERVICES by propagating their extensions down to the root of type
(match (find (matching-extension target)
(service-type-extensions (service-kind service)))
(($ <service-extension> _ compute)
- (compute (service-parameters service))))))
+ (compute (service-value service))))))
(match (filter (lambda (service)
(eq? (service-kind service) target-type))
(extensions (map (apply-extension sink) dependents))
(extend (service-type-extend (service-kind sink)))
(compose (service-type-compose (service-kind sink)))
- (params (service-parameters 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 #f)
(target-type target-type))
(&message
- (message (format #f (_ "service of type '~a' not found")
+ (message (format #f (G_ "service of type '~a' not found")
(service-type-name target-type)))))))
(x
(raise
(&message
(message
(format #f
- (_ "more than one target service of type '~a'")
+ (G_ "more than one target service of type '~a'")
(service-type-name target-type)))))))))
;;; services.scm ends here.
HCoop / jackhill / guix / guix.git / blobdiff