;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2018 Danny Milosavljevic <dannym@scratchpost.org>
;;; Copyright © 2020 Jakub Kądziołka <kuba@kadziolka.net>
;;; Copyright © 2020, 2021 Maxim Cournoyer <maxim.cournoyer@gmail.com>
;;; Copyright © 2020 Efraim Flashner <efraim@flashner.co.il>
;;; Copyright © 2020 Jesse Dowell <jessedowell@gmail.com>
;;; Copyright © 2021 Brice Waegeneire <brice@waegenei.re>
;;; Copyright © 2023 Giacomo Leidi <goodoldpaul@autistici.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 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 setuid)
#:use-module (gnu system shadow)
#:use-module (gnu packages admin) ;shadow
#:use-module (gnu packages docker)
#:use-module (gnu packages linux) ;singularity
#:use-module (guix records)
#:use-module (guix diagnostics)
#:use-module (guix gexp)
#:use-module (guix i18n)
#:use-module (guix packages)
#:use-module (srfi srfi-1)
#:use-module (ice-9 format)
#:use-module (ice-9 match)
#:export (docker-configuration
docker-service-type
singularity-service-type
oci-container-configuration
oci-container-configuration?
oci-container-configuration-fields
oci-container-configuration-user
oci-container-configuration-group
oci-container-configuration-command
oci-container-configuration-entrypoint
oci-container-configuration-environment
oci-container-configuration-image
oci-container-configuration-provision
oci-container-configuration-network
oci-container-configuration-ports
oci-container-configuration-volumes
oci-container-service-type
oci-container-shepherd-service))
(define-maybe file-like)
(define-configuration docker-configuration
(docker
(file-like docker)
"Docker daemon package.")
(docker-cli
(file-like docker-cli)
"Docker client package.")
(containerd
(file-like containerd)
"containerd package.")
(proxy
(file-like 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).")
(debug?
(boolean #f)
"Enable or disable debug output.")
(enable-iptables?
(boolean #t)
"Enable addition of iptables rules (enabled by default).")
(environment-variables
(list '())
"Environment variables to set for dockerd")
(config-file
(maybe-file-like)
"JSON configuration file to pass to dockerd")
(no-serialization))
(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))
(debug? (docker-configuration-debug? config))
(containerd (docker-configuration-containerd config)))
(shepherd-service
(documentation "containerd daemon.")
(provision '(containerd))
(start #~(make-forkexec-constructor
(list (string-append #$package "/bin/containerd")
#$@(if debug?
'("--log-level=debug")
'()))
;; For finding containerd-shim binary.
#:environment-variables
(list (string-append "PATH=" #$containerd "/bin"))
#:pid-file "/run/containerd/containerd.pid"
#:pid-file-timeout 300
#:log-file "/var/log/containerd.log"))
(stop #~(make-kill-destructor)))))
(define (docker-shepherd-service config)
(let* ((docker (docker-configuration-docker config))
(enable-proxy? (docker-configuration-enable-proxy? config))
(enable-iptables? (docker-configuration-enable-iptables? config))
(environment-variables (docker-configuration-environment-variables config))
(proxy (docker-configuration-proxy config))
(debug? (docker-configuration-debug? config))
(config-file (docker-configuration-config-file config)))
(shepherd-service
(documentation "Docker daemon.")
(provision '(dockerd))
(requirement '(containerd
dbus-system
elogind
file-system-/sys/fs/cgroup
networking
udev))
(start #~(make-forkexec-constructor
(list (string-append #$docker "/bin/dockerd")
"-p" "/var/run/docker.pid"
#$@(if (not (eq? config-file %unset-value))
(list #~(string-append
"--config-file=" #$config-file))
'())
#$@(if debug?
'("--debug" "--log-level=debug")
'())
#$@(if enable-proxy?
(list "--userland-proxy=true"
#~(string-append
"--userland-proxy-path=" #$proxy "/bin/proxy"))
'("--userland-proxy=false"))
(if #$enable-iptables?
"--iptables"
"--iptables=false")
"--containerd" "/run/containerd/containerd.sock")
#:environment-variables
(list #$@environment-variables)
#:pid-file "/var/run/docker.pid"
#:log-file "/var/log/docker.log"))
(stop #~(make-kill-destructor)))))
(define docker-service-type
(service-type (name 'docker)
(description "Provide capability to run Docker application
bundles in Docker containers.")
(extensions
(list
;; Make sure the 'docker' command is available.
(service-extension profile-service-type
(compose list docker-configuration-docker-cli))
(service-extension activation-service-type
%docker-activation)
(service-extension shepherd-root-service-type
(lambda (config)
(list (containerd-shepherd-service config)
(docker-shepherd-service config))))
(service-extension account-service-type
(const %docker-accounts))))
(default-value (docker-configuration))))
;;;
;;; Singularity.
;;;
(define %singularity-activation
(with-imported-modules '((guix build utils))
#~(begin
(use-modules (guix build utils))
(define %mount-directory
"/var/singularity/mnt/")
;; Create the directories that Singularity 2.6 expects to find. Make
;; them #o755 like the 'install-data-hook' rule in 'Makefile.am' of
;; Singularity 2.6.1.
(for-each (lambda (directory)
(let ((directory (string-append %mount-directory
directory)))
(mkdir-p directory)
(chmod directory #o755)))
'("container" "final" "overlay" "session"))
(chmod %mount-directory #o755))))
(define (singularity-setuid-programs singularity)
"Return the setuid-root programs that SINGULARITY needs."
(define helpers
;; The helpers, under a meaningful name.
(computed-file "singularity-setuid-helpers"
#~(begin
(mkdir #$output)
(for-each (lambda (program)
(symlink (string-append #$singularity
"/libexec/singularity"
"/bin/"
program "-suid")
(string-append #$output
"/singularity-"
program
"-helper")))
'("action" "mount" "start")))))
(map file-like->setuid-program
(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)))
;;;
;;; OCI container.
;;;
(define (oci-sanitize-pair pair delimiter)
(define (valid? member)
(or (string? member)
(gexp? member)
(file-like? member)))
(match pair
(((? valid? key) . (? valid? value))
#~(string-append #$key #$delimiter #$value))
(_
(raise
(formatted-message
(G_ "pair members must contain only strings, gexps or file-like objects
but ~a was found")
pair)))))
(define (oci-sanitize-mixed-list name value delimiter)
(map
(lambda (el)
(cond ((string? el) el)
((pair? el) (oci-sanitize-pair el delimiter))
(else
(raise
(formatted-message
(G_ "~a members must be either a string or a pair but ~a was
found!")
name el)))))
value))
(define (oci-sanitize-environment value)
;; Expected spec format:
;; '(("HOME" . "/home/nobody") "JAVA_HOME=/java")
(oci-sanitize-mixed-list "environment" value "="))
(define (oci-sanitize-ports value)
;; Expected spec format:
;; '(("8088" . "80") "2022:22")
(oci-sanitize-mixed-list "ports" value ":"))
(define (oci-sanitize-volumes value)
;; Expected spec format:
;; '(("/mnt/dir" . "/dir") "/run/current-system/profile:/java")
(oci-sanitize-mixed-list "volumes" value ":"))
(define-maybe/no-serialization string)
(define-configuration/no-serialization oci-container-configuration
(user
(string "oci-container")
"The user under whose authority docker commands will be run.")
(group
(string "docker")
"The group under whose authority docker commands will be run.")
(command
(list-of-strings '())
"Overwrite the default command (@code{CMD}) of the image.")
(entrypoint
(maybe-string)
"Overwrite the default entrypoint (@code{ENTRYPOINT}) of the image.")
(environment
(list '())
"Set environment variables. This can be a list of pairs or strings, even
mixed:
@lisp
(list '(\"LANGUAGE\" . \"eo:ca:eu\")
\"JAVA_HOME=/opt/java\")
@end lisp
String are passed directly to the Docker CLI. You can refer to the
@url{https://docs.docker.com/engine/reference/commandline/run/#env,upstream}
documentation for semantics."
(sanitizer oci-sanitize-environment))
(image
(string)
"The image used to build the container. Images are resolved by the Docker
Engine, and follow the usual format
@code{myregistry.local:5000/testing/test-image:tag}.")
(provision
(maybe-string)
"Set the name of the provisioned Shepherd service.")
(network
(maybe-string)
"Set a Docker network for the spawned container.")
(ports
(list '())
"Set the port or port ranges to expose from the spawned container. This can
be a list of pairs or strings, even mixed:
@lisp
(list '(\"8080\" . \"80\")
\"10443:443\")
@end lisp
String are passed directly to the Docker CLI. You can refer to the
@url{https://docs.docker.com/engine/reference/commandline/run/#publish,upstream}
documentation for semantics."
(sanitizer oci-sanitize-ports))
(volumes
(list '())
"Set volume mappings for the spawned container. This can be a
list of pairs or strings, even mixed:
@lisp
(list '(\"/root/data/grafana\" . \"/var/lib/grafana\")
\"/gnu/store:/gnu/store\")
@end lisp
String are passed directly to the Docker CLI. You can refer to the
@url{https://docs.docker.com/engine/reference/commandline/run/#volume,upstream}
documentation for semantics."
(sanitizer oci-sanitize-volumes))
(container-user
(maybe-string)
"Set the current user inside the spawned container. You can refer to the
@url{https://docs.docker.com/engine/reference/run/#user,upstream}
documentation for semantics.")
(workdir
(maybe-string)
"Set the current working for the spawned Shepherd service.
You can refer to the
@url{https://docs.docker.com/engine/reference/run/#workdir,upstream}
documentation for semantics."))
(define oci-container-configuration->options
(lambda (config)
(let ((entrypoint
(oci-container-configuration-entrypoint config))
(network
(oci-container-configuration-network config))
(user
(oci-container-configuration-container-user config))
(workdir
(oci-container-configuration-workdir config)))
(apply append
(filter (compose not unspecified?)
`(,(if (maybe-value-set? entrypoint)
`("--entrypoint" ,entrypoint)
'())
,(append-map
(lambda (spec)
(list "--env" spec))
(oci-container-configuration-environment config))
,(if (maybe-value-set? network)
`("--network" ,network)
'())
,(if (maybe-value-set? user)
`("--user" ,user)
'())
,(if (maybe-value-set? workdir)
`("--workdir" ,workdir)
'())
,(append-map
(lambda (spec)
(list "-p" spec))
(oci-container-configuration-ports config))
,(append-map
(lambda (spec)
(list "-v" spec))
(oci-container-configuration-volumes config))))))))
(define (oci-container-shepherd-service config)
(define (guess-name name image)
(if (maybe-value-set? name)
name
(string-append "docker-"
(basename (car (string-split image #\:))))))
(let* ((docker-command (file-append docker-cli "/bin/docker"))
(user (oci-container-configuration-user config))
(group (oci-container-configuration-group config))
(command (oci-container-configuration-command config))
(provision (oci-container-configuration-provision config))
(image (oci-container-configuration-image config))
(options (oci-container-configuration->options config))
(name (guess-name provision image)))
(shepherd-service (provision `(,(string->symbol name)))
(requirement '(dockerd user-processes))
(respawn? #f)
(documentation
(string-append
"Docker backed Shepherd service for image: " image))
(start
#~(make-forkexec-constructor
;; docker run [OPTIONS] IMAGE [COMMAND] [ARG...]
(list #$docker-command "run" "--rm"
"--name" #$name
#$@options #$image #$@command)
#:user #$user
#:group #$group))
(stop
#~(lambda _
(invoke #$docker-command "rm" "-f" #$name)))
(actions
(list
(shepherd-action
(name 'pull)
(documentation
(format #f "Pull ~a's image (~a)."
name image))
(procedure
#~(lambda _
(invoke #$docker-command "pull" #$image)))))))))
(define %oci-container-accounts
(list (user-account
(name "oci-container")
(comment "OCI services account")
(group "docker")
(system? #t)
(home-directory "/var/empty")
(shell (file-append shadow "/sbin/nologin")))))
(define (configs->shepherd-services configs)
(map oci-container-shepherd-service configs))
(define oci-container-service-type
(service-type (name 'oci-container)
(extensions (list (service-extension profile-service-type
(lambda _ (list docker-cli)))
(service-extension account-service-type
(const %oci-container-accounts))
(service-extension shepherd-root-service-type
configs->shepherd-services)))
(default-value '())
(extend append)
(compose concatenate)
(description
"This service allows the management of Docker and OCI
containers as Shepherd services.")))