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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2017 Andy Wingo <wingo@igalia.com>
;;;
;;; 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 potluck)
#:use-module (gnu services)
#:use-module (gnu services shepherd)
#:use-module (gnu system shadow)
#:use-module (gnu packages admin)
#:use-module (gnu packages package-management)
#:use-module (gnu packages version-control)
#:use-module (guix records)
#:use-module (guix gexp)
#:use-module (srfi srfi-1)
#:use-module (ice-9 match)
#:export (potluck-configuration
potluck-configuration?
potluck-service-type))
;;; Commentary:
;;;
;;; Guix potluck services.
;;;
;;; Code:
;; FIXME: Replace with guix version that has potluck.
(define guix/potluck guix)
(define-record-type* <potluck-configuration> potluck-configuration
make-potluck-configuration
potluck-configuration?
(package potluck-configuration-package ;<package>
(default guix/potluck))
(scratch potluck-configuration-scratch
(default "/var/cache/potluck/scratch"))
(source potluck-configuration-source
(default "/var/cache/potluck/source"))
(source-repo potluck-configuration-source-repo
(default "/srv/git/source.git"))
(target potluck-configuration-target
(default "/var/cache/potluck/target"))
(target-repo potluck-configuration-target-repo
(default "/srv/git/target.git"))
(user potluck-configuration-user
(default "potluck"))
(group potluck-configuration-group
(default "potluck")))
(define potluck-accounts
(match-lambda
(($ <potluck-configuration>
package scratch source source-repo target target-repo user group)
(filter identity
(list
(and (equal? group "potluck")
(user-group
(name "potluck")
(system? #t)))
(and (equal? user "potluck")
(user-account
(name "potluck")
(group group)
(system? #t)
(comment "Potluck Service")
(home-directory "/var/empty")
(shell (file-append shadow "/sbin/nologin")))))))))
(define potluck-activation-service
(match-lambda
(($ <potluck-configuration>
package scratch source source-repo target target-repo user group)
(with-imported-modules '((guix build utils))
#~(begin
(use-modules (guix build utils) (ice-9 ftw))
(define (chown-r dir user group)
(let ((uid (passwd:uid (getpwnam user)))
(gid (group:gid (getgrnam group))))
(for-each (lambda (f) (chown f uid gid))
(find-files dir #:directories? #t))))
(define (ensure-git-repo dir)
(unless (file-exists? dir)
(mkdir-p dir)
(unless (zero? (system* (string-append #$git "/bin/git")
"init" "--bare" dir))
(error "failed to create repository" dir))
(chown-r dir #$user #$group)))
(define (ensure-checkout repo dir)
(unless (file-exists? dir)
(mkdir-p (dirname dir))
(unless (zero? (system* (string-append #$git "/bin/git")
"clone" repo dir))
(error "failed to check out repository" repo dir))
(chown-r dir #$user #$group)))
(mkdir-p #$scratch)
(chown-r #$scratch #$user #$group)
(ensure-git-repo #$source-repo)
(ensure-git-repo #$target-repo)
(ensure-checkout #$source-repo #$source)
(ensure-checkout #$target-repo #$target))))))
(define potluck-shepherd-service
(match-lambda
(($ <potluck-configuration>
package scratch source source-repo target target-repo user group)
(list (shepherd-service
(provision '(potluck))
(documentation "Run the potluck daemon.")
(requirement '(networking))
(start #~(make-forkexec-constructor
'(#$(file-append package "/bin/guix") "host-channel"
#$(format #f "--scratch=~a" scratch)
#$(format #f "--source=~a" source)
#$(format #f "--target=~a" target))
#:user #$user #:group #$group))
(stop #~(make-kill-destructor)))))))
(define potluck-service-type
(service-type (name 'potluck)
(extensions
(list (service-extension activation-service-type
potluck-activation-service)
(service-extension shepherd-root-service-type
potluck-shepherd-service)
(service-extension account-service-type
potluck-accounts)))
(default-value (potluck-configuration))))
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