487 lines
19 KiB
Scheme
487 lines
19 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2018 Danny Milosavljevic <dannym@scratchpost.org>
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;;; Copyright © 2020 Jakub Kądziołka <kuba@kadziolka.net>
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;;; Copyright © 2020, 2021 Maxim Cournoyer <maxim.cournoyer@gmail.com>
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;;; Copyright © 2020 Efraim Flashner <efraim@flashner.co.il>
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;;; Copyright © 2020 Jesse Dowell <jessedowell@gmail.com>
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;;; Copyright © 2021 Brice Waegeneire <brice@waegenei.re>
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;;; Copyright © 2023 Giacomo Leidi <goodoldpaul@autistici.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (gnu services docker)
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#:use-module (gnu services)
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#:use-module (gnu services configuration)
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#:use-module (gnu services base)
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#:use-module (gnu services dbus)
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#:use-module (gnu services shepherd)
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#:use-module (gnu system setuid)
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#:use-module (gnu system shadow)
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#:use-module (gnu packages admin) ;shadow
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#:use-module (gnu packages docker)
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#:use-module (gnu packages linux) ;singularity
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#:use-module (guix records)
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#:use-module (guix diagnostics)
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#:use-module (guix gexp)
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#:use-module (guix i18n)
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#:use-module (guix packages)
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#:use-module (srfi srfi-1)
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#:use-module (ice-9 format)
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#:use-module (ice-9 match)
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#:export (docker-configuration
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docker-service-type
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singularity-service-type
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oci-container-configuration
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oci-container-configuration?
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oci-container-configuration-fields
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oci-container-configuration-user
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oci-container-configuration-group
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oci-container-configuration-command
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oci-container-configuration-entrypoint
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oci-container-configuration-environment
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oci-container-configuration-image
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oci-container-configuration-provision
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oci-container-configuration-network
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oci-container-configuration-ports
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oci-container-configuration-volumes
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oci-container-service-type
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oci-container-shepherd-service))
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(define-maybe file-like)
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(define-configuration docker-configuration
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(docker
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(file-like docker)
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"Docker daemon package.")
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(docker-cli
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(file-like docker-cli)
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"Docker client package.")
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(containerd
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(file-like containerd)
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"containerd package.")
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(proxy
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(file-like docker-libnetwork-cmd-proxy)
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"The proxy package to support inter-container and outside-container
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loop-back communications.")
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(enable-proxy?
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(boolean #t)
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"Enable or disable the user-land proxy (enabled by default).")
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(debug?
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(boolean #f)
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"Enable or disable debug output.")
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(enable-iptables?
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(boolean #t)
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"Enable addition of iptables rules (enabled by default).")
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(environment-variables
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(list '())
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"Environment variables to set for dockerd")
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(config-file
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(maybe-file-like)
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"JSON configuration file to pass to dockerd")
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(no-serialization))
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(define %docker-accounts
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(list (user-group (name "docker") (system? #t))))
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(define (%containerd-activation config)
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(let ((state-dir "/var/lib/containerd"))
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#~(begin
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(use-modules (guix build utils))
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(mkdir-p #$state-dir))))
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(define (%docker-activation config)
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(%containerd-activation config)
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(let ((state-dir "/var/lib/docker"))
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#~(begin
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(use-modules (guix build utils))
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(mkdir-p #$state-dir))))
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(define (containerd-shepherd-service config)
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(let* ((package (docker-configuration-containerd config))
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(debug? (docker-configuration-debug? config))
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(containerd (docker-configuration-containerd config)))
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(shepherd-service
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(documentation "containerd daemon.")
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(provision '(containerd))
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(start #~(make-forkexec-constructor
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(list (string-append #$package "/bin/containerd")
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#$@(if debug?
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'("--log-level=debug")
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'()))
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;; For finding containerd-shim binary.
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#:environment-variables
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(list (string-append "PATH=" #$containerd "/bin"))
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#:pid-file "/run/containerd/containerd.pid"
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#:pid-file-timeout 300
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#:log-file "/var/log/containerd.log"))
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(stop #~(make-kill-destructor)))))
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(define (docker-shepherd-service config)
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(let* ((docker (docker-configuration-docker config))
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(enable-proxy? (docker-configuration-enable-proxy? config))
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(enable-iptables? (docker-configuration-enable-iptables? config))
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(environment-variables (docker-configuration-environment-variables config))
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(proxy (docker-configuration-proxy config))
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(debug? (docker-configuration-debug? config))
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(config-file (docker-configuration-config-file config)))
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(shepherd-service
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(documentation "Docker daemon.")
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(provision '(dockerd))
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(requirement '(containerd
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dbus-system
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elogind
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file-system-/sys/fs/cgroup
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networking
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udev))
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(start #~(make-forkexec-constructor
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(list (string-append #$docker "/bin/dockerd")
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"-p" "/var/run/docker.pid"
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#$@(if (not (eq? config-file %unset-value))
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(list #~(string-append
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"--config-file=" #$config-file))
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'())
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#$@(if debug?
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'("--debug" "--log-level=debug")
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'())
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#$@(if enable-proxy?
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(list "--userland-proxy=true"
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#~(string-append
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"--userland-proxy-path=" #$proxy "/bin/proxy"))
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'("--userland-proxy=false"))
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(if #$enable-iptables?
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"--iptables"
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"--iptables=false")
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"--containerd" "/run/containerd/containerd.sock")
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#:environment-variables
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(list #$@environment-variables)
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#:pid-file "/var/run/docker.pid"
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#:log-file "/var/log/docker.log"))
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(stop #~(make-kill-destructor)))))
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(define docker-service-type
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(service-type (name 'docker)
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(description "Provide capability to run Docker application
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bundles in Docker containers.")
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(extensions
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(list
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;; Make sure the 'docker' command is available.
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(service-extension profile-service-type
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(compose list docker-configuration-docker-cli))
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(service-extension activation-service-type
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%docker-activation)
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(service-extension shepherd-root-service-type
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(lambda (config)
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(list (containerd-shepherd-service config)
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(docker-shepherd-service config))))
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(service-extension account-service-type
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(const %docker-accounts))))
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(default-value (docker-configuration))))
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;;;
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;;; Singularity.
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;;;
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(define %singularity-activation
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(with-imported-modules '((guix build utils))
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#~(begin
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(use-modules (guix build utils))
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(define %mount-directory
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"/var/singularity/mnt/")
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;; Create the directories that Singularity 2.6 expects to find. Make
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;; them #o755 like the 'install-data-hook' rule in 'Makefile.am' of
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;; Singularity 2.6.1.
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(for-each (lambda (directory)
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(let ((directory (string-append %mount-directory
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directory)))
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(mkdir-p directory)
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(chmod directory #o755)))
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'("container" "final" "overlay" "session"))
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(chmod %mount-directory #o755))))
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(define (singularity-setuid-programs singularity)
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"Return the setuid-root programs that SINGULARITY needs."
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(define helpers
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;; The helpers, under a meaningful name.
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(computed-file "singularity-setuid-helpers"
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#~(begin
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(mkdir #$output)
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(for-each (lambda (program)
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(symlink (string-append #$singularity
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"/libexec/singularity"
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"/bin/"
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program "-suid")
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(string-append #$output
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"/singularity-"
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program
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"-helper")))
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'("action" "mount" "start")))))
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(map file-like->setuid-program
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(list (file-append helpers "/singularity-action-helper")
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(file-append helpers "/singularity-mount-helper")
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(file-append helpers "/singularity-start-helper"))))
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(define singularity-service-type
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(service-type (name 'singularity)
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(description
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"Install the Singularity application bundle tool.")
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(extensions
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(list (service-extension setuid-program-service-type
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singularity-setuid-programs)
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(service-extension activation-service-type
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(const %singularity-activation))))
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(default-value singularity)))
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;;;
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;;; OCI container.
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;;;
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(define (oci-sanitize-pair pair delimiter)
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(define (valid? member)
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(or (string? member)
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(gexp? member)
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(file-like? member)))
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(match pair
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(((? valid? key) . (? valid? value))
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#~(string-append #$key #$delimiter #$value))
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(_
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(raise
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(formatted-message
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(G_ "pair members must contain only strings, gexps or file-like objects
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but ~a was found")
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pair)))))
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(define (oci-sanitize-mixed-list name value delimiter)
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(map
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(lambda (el)
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(cond ((string? el) el)
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((pair? el) (oci-sanitize-pair el delimiter))
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(else
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(raise
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(formatted-message
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(G_ "~a members must be either a string or a pair but ~a was
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found!")
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name el)))))
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value))
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(define (oci-sanitize-environment value)
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;; Expected spec format:
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;; '(("HOME" . "/home/nobody") "JAVA_HOME=/java")
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(oci-sanitize-mixed-list "environment" value "="))
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(define (oci-sanitize-ports value)
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;; Expected spec format:
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;; '(("8088" . "80") "2022:22")
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(oci-sanitize-mixed-list "ports" value ":"))
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(define (oci-sanitize-volumes value)
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;; Expected spec format:
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;; '(("/mnt/dir" . "/dir") "/run/current-system/profile:/java")
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(oci-sanitize-mixed-list "volumes" value ":"))
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(define-maybe/no-serialization string)
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(define-configuration/no-serialization oci-container-configuration
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(user
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(string "oci-container")
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"The user under whose authority docker commands will be run.")
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(group
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(string "docker")
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"The group under whose authority docker commands will be run.")
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(command
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(list-of-strings '())
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"Overwrite the default command (@code{CMD}) of the image.")
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(entrypoint
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(maybe-string)
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"Overwrite the default entrypoint (@code{ENTRYPOINT}) of the image.")
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(environment
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(list '())
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"Set environment variables. This can be a list of pairs or strings, even
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mixed:
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@lisp
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(list '(\"LANGUAGE\" . \"eo:ca:eu\")
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\"JAVA_HOME=/opt/java\")
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@end lisp
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String are passed directly to the Docker CLI. You can refer to the
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@url{https://docs.docker.com/engine/reference/commandline/run/#env,upstream}
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documentation for semantics."
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(sanitizer oci-sanitize-environment))
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(image
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(string)
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"The image used to build the container. Images are resolved by the Docker
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Engine, and follow the usual format
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@code{myregistry.local:5000/testing/test-image:tag}.")
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(provision
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(maybe-string)
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"Set the name of the provisioned Shepherd service.")
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(network
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(maybe-string)
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"Set a Docker network for the spawned container.")
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(ports
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(list '())
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"Set the port or port ranges to expose from the spawned container. This can
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be a list of pairs or strings, even mixed:
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@lisp
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(list '(\"8080\" . \"80\")
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\"10443:443\")
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@end lisp
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String are passed directly to the Docker CLI. You can refer to the
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@url{https://docs.docker.com/engine/reference/commandline/run/#publish,upstream}
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documentation for semantics."
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(sanitizer oci-sanitize-ports))
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(volumes
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(list '())
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"Set volume mappings for the spawned container. This can be a
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list of pairs or strings, even mixed:
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@lisp
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(list '(\"/root/data/grafana\" . \"/var/lib/grafana\")
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\"/gnu/store:/gnu/store\")
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@end lisp
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String are passed directly to the Docker CLI. You can refer to the
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@url{https://docs.docker.com/engine/reference/commandline/run/#volume,upstream}
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documentation for semantics."
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(sanitizer oci-sanitize-volumes))
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(container-user
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(maybe-string)
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"Set the current user inside the spawned container. You can refer to the
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@url{https://docs.docker.com/engine/reference/run/#user,upstream}
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documentation for semantics.")
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(workdir
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(maybe-string)
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"Set the current working for the spawned Shepherd service.
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You can refer to the
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@url{https://docs.docker.com/engine/reference/run/#workdir,upstream}
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documentation for semantics."))
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(define oci-container-configuration->options
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(lambda (config)
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(let ((entrypoint
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(oci-container-configuration-entrypoint config))
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(network
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(oci-container-configuration-network config))
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(user
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(oci-container-configuration-container-user config))
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(workdir
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(oci-container-configuration-workdir config)))
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(apply append
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(filter (compose not unspecified?)
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`(,(if (maybe-value-set? entrypoint)
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`("--entrypoint" ,entrypoint)
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'())
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,(append-map
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(lambda (spec)
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(list "--env" spec))
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(oci-container-configuration-environment config))
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,(if (maybe-value-set? network)
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`("--network" ,network)
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'())
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,(if (maybe-value-set? user)
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`("--user" ,user)
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'())
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,(if (maybe-value-set? workdir)
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`("--workdir" ,workdir)
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'())
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,(append-map
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(lambda (spec)
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(list "-p" spec))
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(oci-container-configuration-ports config))
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,(append-map
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(lambda (spec)
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(list "-v" spec))
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(oci-container-configuration-volumes config))))))))
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(define (oci-container-shepherd-service config)
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(define (guess-name name image)
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(if (maybe-value-set? name)
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name
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(string-append "docker-"
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(basename (car (string-split image #\:))))))
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(let* ((docker-command (file-append docker-cli "/bin/docker"))
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(user (oci-container-configuration-user config))
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(group (oci-container-configuration-group config))
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(command (oci-container-configuration-command config))
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(provision (oci-container-configuration-provision config))
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(image (oci-container-configuration-image config))
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(options (oci-container-configuration->options config))
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(name (guess-name provision image)))
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(shepherd-service (provision `(,(string->symbol name)))
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(requirement '(dockerd user-processes))
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(respawn? #f)
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(documentation
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(string-append
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"Docker backed Shepherd service for image: " image))
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(start
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#~(make-forkexec-constructor
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;; docker run [OPTIONS] IMAGE [COMMAND] [ARG...]
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(list #$docker-command "run" "--rm"
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"--name" #$name
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#$@options #$image #$@command)
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#:user #$user
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#:group #$group))
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(stop
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#~(lambda _
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(invoke #$docker-command "rm" "-f" #$name)))
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(actions
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(list
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(shepherd-action
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(name 'pull)
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(documentation
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(format #f "Pull ~a's image (~a)."
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name image))
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(procedure
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#~(lambda _
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(invoke #$docker-command "pull" #$image)))))))))
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(define %oci-container-accounts
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(list (user-account
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(name "oci-container")
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(comment "OCI services account")
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(group "docker")
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(system? #t)
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(home-directory "/var/empty")
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(shell (file-append shadow "/sbin/nologin")))))
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(define (configs->shepherd-services configs)
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(map oci-container-shepherd-service configs))
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(define oci-container-service-type
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(service-type (name 'oci-container)
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(extensions (list (service-extension profile-service-type
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(lambda _ (list docker-cli)))
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(service-extension account-service-type
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(const %oci-container-accounts))
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(service-extension shepherd-root-service-type
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configs->shepherd-services)))
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(default-value '())
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(extend append)
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(compose concatenate)
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(description
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"This service allows the management of Docker and OCI
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containers as Shepherd services.")))
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