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;;; guix-forge --- Guix software forge meta-service
;;; Copyright © 2023 Arun Isaac <arunisaac@systemreboot.net>
;;;
;;; This file is part of guix-forge.
;;;
;;; guix-forge 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.
;;;
;;; guix-forge 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 guix-forge. If not, see
;;; <https://www.gnu.org/licenses/>.
(define-module (forge fcgiwrap)
#:use-module (forge environment)
#:use-module (forge socket)
#:use-module (gnu build linux-container)
#:use-module ((gnu packages web) #:select (fcgiwrap))
#:use-module (gnu services)
#:use-module (gnu services shepherd)
#:use-module (gnu system file-systems)
#:use-module (guix gexp)
#:use-module (guix least-authority)
#:use-module (guix records)
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
#:export (fcgiwrap-service-type
fcgiwrap-configuration
fcgiwrap-configuration?
fcgiwrap-configuration-package
fcgiwrap-configuration-instances
fcgiwrap-instance
fcgiwrap-instance?
fcgiwrap-instance-name
fcgiwrap-instance-socket
fcgiwrap-instance-processes
fcgiwrap-instance-environment-variables
fcgiwrap-instance-mappings))
(define-record-type* <fcgiwrap-configuration>
fcgiwrap-configuration make-fcgiwrap-configuration
fcgiwrap-configuration?
(package fcgiwrap-configuration-package
(default fcgiwrap))
(instances fcgiwrap-configuration-instances
(default '())))
(define-record-type* <fcgiwrap-instance>
fcgiwrap-instance make-fcgiwrap-instance
fcgiwrap-instance?
this-fcgiwrap-instance
(name fcgiwrap-instance-name)
(socket fcgiwrap-instance-socket
(default (forge-unix-socket
(path (string-append "/var/run/fcgiwrap/"
(fcgiwrap-instance-name this-fcgiwrap-instance)
"/socket"))))
(thunked))
(user fcgiwrap-instance-user)
(group fcgiwrap-instance-group)
(processes fcgiwrap-instance-processes
(default 1))
(environment-variables fcgiwrap-instance-environment-variables
(default '()))
(mappings fcgiwrap-instance-mappings
(default '())))
(define (fcgiwrap-activation config)
(with-imported-modules '((guix build utils))
#~(begin
(use-modules (guix build utils))
;; Create socket directories and set ownership.
(for-each (match-lambda
((user-name group-name socket-directory)
(mkdir-p socket-directory)
(let ((user (getpw user-name))
(group (getgr group-name)))
(chown socket-directory (passwd:uid user) (group:gid group)))))
'#$(filter-map (match-record-lambda <fcgiwrap-instance>
(socket user group)
(and (forge-unix-socket? socket)
(list user
group
(dirname (forge-unix-socket-path socket)))))
(fcgiwrap-configuration-instances config))))))
(define (socket->fcgiwrap-socket-url socket)
"Serialize @var{socket} to URL as required by fcgiwrap."
(match socket
;; KLUDGE: When passed a host socket, we assume it resolves to an
;; IPv4 address, not an IPv6 address.
(($ <forge-host-socket> hostname port)
(string-append "tcp:" hostname ":" (number->string port)))
(($ <forge-ip-socket> (? ipv4-address? ip) port)
(string-append "tcp:" ip ":" (number->string port)))
(($ <forge-ip-socket> (? ipv6-address? ip) port)
(string-append "tcp6:[" ip "]:" (number->string port)))
(($ <forge-unix-socket> path)
(string-append "unix:" path))))
(define (fcgiwrap-shepherd-services config)
(map (match-record-lambda <fcgiwrap-instance>
(name socket user group processes environment-variables mappings)
(shepherd-service
(documentation (string-append "Run fcgiwrap for " name " script."))
(provision '(fcgiwrap))
(requirement '(networking))
(modules '((ice-9 match)))
(start
#~(make-forkexec-constructor
(list #$(least-authority-wrapper
(file-append (fcgiwrap-configuration-package config)
"/sbin/fcgiwrap")
#:name (string-append "fcgiwrap-" name "-pola-wrapper")
#:mappings (append
;; Mappings for Unix socket directories
(if (forge-unix-socket? socket)
(list (file-system-mapping
(source (dirname (forge-unix-socket-path socket)))
(target source)
(writable? #t)))
(list))
;; Additional mappings
mappings)
#:preserved-environment-variables
(map environment-variable-name
environment-variables)
;; TODO: If socket is a Unix socket, run in a
;; network namespace. We can't do this yet due to
;; https://yhetil.org/guix/m1ilknoi5r.fsf@fastmail.net/
#:namespaces (delq 'net %namespaces))
"-s" #$(socket->fcgiwrap-socket-url socket)
"-c" #$(number->string processes))
#:user #$user
#:group #$group
#:environment-variables
(list #$@(map (lambda (variable)
#~(string-append #$(environment-variable-name variable)
"="
#$(environment-variable-value variable)))
environment-variables))
#:log-file #$(string-append "/var/log/fcgiwrap/" name ".log")))
(stop #~(make-kill-destructor))))
(fcgiwrap-configuration-instances config)))
(define fcgiwrap-service-type
(service-type
(name 'fcgiwrap)
(description "Run fcgiwrap.")
(extensions (list (service-extension activation-service-type
fcgiwrap-activation)
(service-extension shepherd-root-service-type
fcgiwrap-shepherd-services)))
(compose concatenate)
(extend (lambda (config instances)
(fcgiwrap-configuration
(inherit config)
(instances (append (fcgiwrap-configuration-instances config)
instances)))))
(default-value (fcgiwrap-configuration))))
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