mirror of
https://git.in.rschanz.org/ryan77627/guix.git
synced 2024-12-28 07:12:30 -05:00
b9c7ed71b1
Fixes <http://bugs.gnu.org/19779>. Reported by Mark H Weaver <mhw@netris.org>. * gnu/services/dmd.scm (dmd-configuration-file)[config]: Wrap 'primitive-load' calls in 'call-with-error-handling'.
273 lines
10 KiB
Scheme
273 lines
10 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
|
|
;;; Copyright © 2013, 2014, 2015 Ludovic Courtès <ludo@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 (gnu services dmd)
|
|
#:use-module (guix ui)
|
|
#:use-module (guix sets)
|
|
#:use-module (guix gexp)
|
|
#:use-module (guix store)
|
|
#:use-module (guix monads)
|
|
#:use-module (guix records)
|
|
#:use-module (guix derivations) ;imported-modules, etc.
|
|
#:use-module (gnu services)
|
|
#:use-module (gnu packages admin)
|
|
#:use-module (ice-9 match)
|
|
#:use-module (ice-9 vlist)
|
|
#:use-module (srfi srfi-1)
|
|
#:use-module (srfi srfi-26)
|
|
#:use-module (srfi srfi-34)
|
|
#:use-module (srfi srfi-35)
|
|
#:export (dmd-root-service-type
|
|
%dmd-root-service
|
|
dmd-service-type
|
|
|
|
dmd-service
|
|
dmd-service?
|
|
dmd-service-documentation
|
|
dmd-service-provision
|
|
dmd-service-requirement
|
|
dmd-service-respawn?
|
|
dmd-service-start
|
|
dmd-service-stop
|
|
dmd-service-auto-start?
|
|
dmd-service-modules
|
|
dmd-service-imported-modules
|
|
|
|
%default-imported-modules
|
|
%default-modules
|
|
|
|
dmd-service-back-edges))
|
|
|
|
;;; Commentary:
|
|
;;;
|
|
;;; Instantiating system services as a dmd configuration file.
|
|
;;;
|
|
;;; Code:
|
|
|
|
|
|
(define (dmd-boot-gexp services)
|
|
(mlet %store-monad ((dmd-conf (dmd-configuration-file services)))
|
|
(return #~(begin
|
|
;; Keep track of the booted system.
|
|
(false-if-exception (delete-file "/run/booted-system"))
|
|
(symlink (readlink "/run/current-system")
|
|
"/run/booted-system")
|
|
|
|
;; Close any remaining open file descriptors to be on the safe
|
|
;; side. This must be the very last thing we do, because
|
|
;; Guile has internal FDs such as 'sleep_pipe' that need to be
|
|
;; alive.
|
|
(let loop ((fd 3))
|
|
(when (< fd 1024)
|
|
(false-if-exception (close-fdes fd))
|
|
(loop (+ 1 fd))))
|
|
|
|
;; Start dmd.
|
|
(execl (string-append #$dmd "/bin/dmd")
|
|
"dmd" "--config" #$dmd-conf)))))
|
|
|
|
(define dmd-root-service-type
|
|
(service-type
|
|
(name 'dmd-root)
|
|
;; Extending the root dmd service (aka. PID 1) happens by concatenating the
|
|
;; list of services provided by the extensions.
|
|
(compose concatenate)
|
|
(extend append)
|
|
(extensions (list (service-extension boot-service-type dmd-boot-gexp)))))
|
|
|
|
(define %dmd-root-service
|
|
;; The root dmd service, aka. PID 1. Its parameter is a list of
|
|
;; <dmd-service> objects.
|
|
(service dmd-root-service-type '()))
|
|
|
|
(define-syntax-rule (dmd-service-type service-name proc)
|
|
"Return a <service-type> denoting a simple dmd service--i.e., the type for a
|
|
service that extends DMD-ROOT-SERVICE-TYPE and nothing else."
|
|
(service-type
|
|
(name service-name)
|
|
(extensions
|
|
(list (service-extension dmd-root-service-type
|
|
(compose list proc))))))
|
|
|
|
(define %default-imported-modules
|
|
;; Default set of modules imported for a service's consumption.
|
|
'((guix build utils)
|
|
(guix build syscalls)))
|
|
|
|
(define %default-modules
|
|
;; Default set of modules visible in a service's file.
|
|
`((dmd service)
|
|
(oop goops)
|
|
(guix build utils)
|
|
(guix build syscalls)))
|
|
|
|
(define-record-type* <dmd-service>
|
|
dmd-service make-dmd-service
|
|
dmd-service?
|
|
(documentation dmd-service-documentation ;string
|
|
(default "[No documentation.]"))
|
|
(provision dmd-service-provision) ;list of symbols
|
|
(requirement dmd-service-requirement ;list of symbols
|
|
(default '()))
|
|
(respawn? dmd-service-respawn? ;Boolean
|
|
(default #t))
|
|
(start dmd-service-start) ;g-expression (procedure)
|
|
(stop dmd-service-stop ;g-expression (procedure)
|
|
(default #~(const #f)))
|
|
(auto-start? dmd-service-auto-start? ;Boolean
|
|
(default #t))
|
|
(modules dmd-service-modules ;list of module names
|
|
(default %default-modules))
|
|
(imported-modules dmd-service-imported-modules ;list of module names
|
|
(default %default-imported-modules)))
|
|
|
|
|
|
(define (assert-valid-graph services)
|
|
"Raise an error if SERVICES does not define a valid dmd service graph, for
|
|
instance if a service requires a nonexistent service, or if more than one
|
|
service uses a given name.
|
|
|
|
These are constraints that dmd's 'register-service' verifies but we'd better
|
|
verify them here statically than wait until PID 1 halts with an assertion
|
|
failure."
|
|
(define provisions
|
|
;; The set of provisions (symbols). Bail out if a symbol is given more
|
|
;; than once.
|
|
(fold (lambda (service set)
|
|
(define (assert-unique symbol)
|
|
(when (set-contains? set symbol)
|
|
(raise (condition
|
|
(&message
|
|
(message
|
|
(format #f (_ "service '~a' provided more than once")
|
|
symbol)))))))
|
|
|
|
(for-each assert-unique (dmd-service-provision service))
|
|
(fold set-insert set (dmd-service-provision service)))
|
|
(setq 'dmd)
|
|
services))
|
|
|
|
(define (assert-satisfied-requirements service)
|
|
;; Bail out if the requirements of SERVICE aren't satisfied.
|
|
(for-each (lambda (requirement)
|
|
(unless (set-contains? provisions requirement)
|
|
(raise (condition
|
|
(&message
|
|
(message
|
|
(format #f (_ "service '~a' requires '~a', \
|
|
which is undefined")
|
|
(match (dmd-service-provision service)
|
|
((head . _) head)
|
|
(_ service))
|
|
requirement)))))))
|
|
(dmd-service-requirement service)))
|
|
|
|
(for-each assert-satisfied-requirements services))
|
|
|
|
(define (dmd-service-file-name service)
|
|
"Return the file name where the initialization code for SERVICE is to be
|
|
stored."
|
|
(let ((provisions (string-join (map symbol->string
|
|
(dmd-service-provision service)))))
|
|
(string-append "dmd-"
|
|
(string-map (match-lambda
|
|
(#\/ #\-)
|
|
(chr chr))
|
|
provisions)
|
|
".scm")))
|
|
|
|
(define (dmd-service-file service)
|
|
"Return a file defining SERVICE."
|
|
(gexp->file (dmd-service-file-name service)
|
|
#~(begin
|
|
(use-modules #$@(dmd-service-modules service))
|
|
|
|
(make <service>
|
|
#:docstring '#$(dmd-service-documentation service)
|
|
#:provides '#$(dmd-service-provision service)
|
|
#:requires '#$(dmd-service-requirement service)
|
|
#:respawn? '#$(dmd-service-respawn? service)
|
|
#:start #$(dmd-service-start service)
|
|
#:stop #$(dmd-service-stop service)))))
|
|
|
|
(define (dmd-configuration-file services)
|
|
"Return the dmd configuration file for SERVICES."
|
|
(define modules
|
|
(delete-duplicates
|
|
(append-map dmd-service-imported-modules services)))
|
|
|
|
(assert-valid-graph services)
|
|
|
|
(mlet %store-monad ((modules (imported-modules modules))
|
|
(compiled (compiled-modules modules))
|
|
(files (mapm %store-monad dmd-service-file services)))
|
|
(define config
|
|
#~(begin
|
|
(eval-when (expand load eval)
|
|
(set! %load-path (cons #$modules %load-path))
|
|
(set! %load-compiled-path
|
|
(cons #$compiled %load-compiled-path)))
|
|
|
|
(use-modules (system repl error-handling))
|
|
|
|
;; Arrange to spawn a REPL if loading one of FILES fails. This is
|
|
;; better than a kernel panic.
|
|
(call-with-error-handling
|
|
(lambda ()
|
|
(apply register-services (map primitive-load '#$files))))
|
|
|
|
;; guix-daemon 0.6 aborts if 'PATH' is undefined, so work around it.
|
|
(setenv "PATH" "/run/current-system/profile/bin")
|
|
|
|
(format #t "starting services...~%")
|
|
(for-each start
|
|
'#$(append-map dmd-service-provision
|
|
(filter dmd-service-auto-start?
|
|
services)))))
|
|
|
|
(gexp->file "dmd.conf" config)))
|
|
|
|
(define (dmd-service-back-edges services)
|
|
"Return a procedure that, when given a <dmd-service> from SERVICES, returns
|
|
the list of <dmd-service> that depend on it."
|
|
(define provision->service
|
|
(let ((services (fold (lambda (service result)
|
|
(fold (cut vhash-consq <> service <>)
|
|
result
|
|
(dmd-service-provision service)))
|
|
vlist-null
|
|
services)))
|
|
(lambda (name)
|
|
(match (vhash-assq name services)
|
|
((_ . service) service)
|
|
(#f #f)))))
|
|
|
|
(define edges
|
|
(fold (lambda (service edges)
|
|
(fold (lambda (requirement edges)
|
|
(vhash-consq (provision->service requirement) service
|
|
edges))
|
|
edges
|
|
(dmd-service-requirement service)))
|
|
vlist-null
|
|
services))
|
|
|
|
(lambda (service)
|
|
(vhash-foldq* cons '() service edges)))
|
|
|
|
;;; dmd.scm ends here
|