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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2018 Danny Milosavljevic <dannym@scratchpost.org>
;;; Copyright © 2020 Jakub Kądziołka <kuba@kadziolka.net>
;;;
;;; 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 docker)
#:use-module (gnu services)
#:use-module (gnu services configuration)
#:use-module (gnu services base)
#:use-module (gnu services dbus)
#:use-module (gnu services shepherd)
#:use-module (gnu system shadow)
#:use-module (gnu packages docker)
#:use-module (gnu packages linux) ;singularity
#:use-module (guix records)
#:use-module (guix gexp)
#:use-module (guix packages)
#:export (docker-configuration
docker-service-type
singularity-service-type))
;;; We're not using serialize-configuration, but we must define this because
;;; the define-configuration macro validates it exists.
(define (serialize-boolean field-name val)
"")
(define-configuration docker-configuration
(docker
(package docker)
"Docker daemon package.")
(containerd
(package containerd)
"containerd package.")
(proxy
(package docker-libnetwork-cmd-proxy)
"The proxy package to support inter-container and outside-container
loop-back communications.")
(enable-proxy?
(boolean #t)
"Enable or disable the user-land proxy (enabled by default)."))
(define %docker-accounts
(list (user-group (name "docker") (system? #t))))
(define (%containerd-activation config)
(let ((state-dir "/var/lib/containerd"))
#~(begin
(use-modules (guix build utils))
(mkdir-p #$state-dir))))
(define (%docker-activation config)
(%containerd-activation config)
(let ((state-dir "/var/lib/docker"))
#~(begin
(use-modules (guix build utils))
(mkdir-p #$state-dir))))
(define (containerd-shepherd-service config)
(let* ((package (docker-configuration-containerd config)))
(shepherd-service
(documentation "containerd daemon.")
(provision '(containerd))
(start #~(make-forkexec-constructor
(list (string-append #$package "/bin/containerd"))
#:log-file "/var/log/containerd.log"))
(stop #~(make-kill-destructor)))))
(define (docker-shepherd-service config)
(let* ((docker (docker-configuration-docker config))
(enable-proxy? (docker-configuration-enable-proxy? config))
(proxy (docker-configuration-proxy config)))
(shepherd-service
(documentation "Docker daemon.")
(provision '(dockerd))
(requirement '(containerd
dbus-system
elogind
file-system-/sys/fs/cgroup/blkio
file-system-/sys/fs/cgroup/cpu
file-system-/sys/fs/cgroup/cpuset
file-system-/sys/fs/cgroup/devices
file-system-/sys/fs/cgroup/memory
file-system-/sys/fs/cgroup/pids
networking
udev))
(start #~(make-forkexec-constructor
(list (string-append #$docker "/bin/dockerd")
"-p" "/var/run/docker.pid"
(if #$enable-proxy? "--userland-proxy" "")
"--userland-proxy-path" (string-append #$proxy
"/bin/proxy"))
#:pid-file "/var/run/docker.pid"
#:log-file "/var/log/docker.log"))
(stop #~(make-kill-destructor)))))
(define docker-service-type
(service-type (name 'docker)
(description "Provide capability to run Docker application
bundles in Docker containers.")
(extensions
(list
(service-extension activation-service-type
%docker-activation)
(service-extension shepherd-root-service-type
(lambda (config)
(list (containerd-shepherd-service config)
(docker-shepherd-service config))))
(service-extension account-service-type
(const %docker-accounts))))
(default-value (docker-configuration))))
;;;
;;; Singularity.
;;;
(define %singularity-activation
(with-imported-modules '((guix build utils))
#~(begin
(use-modules (guix build utils))
(define %mount-directory
"/var/singularity/mnt/")
;; Create the directories that Singularity 2.6 expects to find. Make
;; them #o755 like the 'install-data-hook' rule in 'Makefile.am' of
;; Singularity 2.6.1.
(for-each (lambda (directory)
(let ((directory (string-append %mount-directory
directory)))
(mkdir-p directory)
(chmod directory #o755)))
'("container" "final" "overlay" "session"))
(chmod %mount-directory #o755))))
(define (singularity-setuid-programs singularity)
"Return the setuid-root programs that SINGULARITY needs."
(define helpers
;; The helpers, under a meaningful name.
(computed-file "singularity-setuid-helpers"
#~(begin
(mkdir #$output)
(for-each (lambda (program)
(symlink (string-append #$singularity
"/libexec/singularity"
"/bin/"
program "-suid")
(string-append #$output
"/singularity-"
program
"-helper")))
'("action" "mount" "start")))))
(list (file-append helpers "/singularity-action-helper")
(file-append helpers "/singularity-mount-helper")
(file-append helpers "/singularity-start-helper")))
(define singularity-service-type
(service-type (name 'singularity)
(description
"Install the Singularity application bundle tool.")
(extensions
(list (service-extension setuid-program-service-type
singularity-setuid-programs)
(service-extension activation-service-type
(const %singularity-activation))))
(default-value singularity)))
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