diff options
Diffstat (limited to 'gnu/system/linux-container.scm')
| -rw-r--r-- | gnu/system/linux-container.scm | 89 |
1 files changed, 71 insertions, 18 deletions
diff --git a/gnu/system/linux-container.scm b/gnu/system/linux-container.scm index 149c3d08a3..16eee7a3cd 100644 --- a/gnu/system/linux-container.scm +++ b/gnu/system/linux-container.scm @@ -1,6 +1,7 @@ ;;; GNU Guix --- Functional package management for GNU ;;; Copyright © 2015 David Thompson <davet@gnu.org> ;;; Copyright © 2016, 2017, 2019 Ludovic Courtès <ludo@gnu.org> +;;; Copyright © 2019 Arun Isaac <arunisaac@systemreboot.net> ;;; ;;; This file is part of GNU Guix. ;;; @@ -35,7 +36,7 @@ containerized-operating-system container-script)) -(define (container-essential-services os) +(define* (container-essential-services os #:key shared-network?) "Return a list of essential services corresponding to OS, a non-containerized OS. This procedure essentially strips essential services from OS that are needed on the bare metal and not in a container." @@ -45,18 +46,32 @@ from OS that are needed on the bare metal and not in a container." (list (service-kind %linux-bare-metal-service) firmware-service-type system-service-type))) - (operating-system-essential-services os))) + (operating-system-default-essential-services os))) (cons (service system-service-type (let ((locale (operating-system-locale-directory os))) (with-monad %store-monad (return `(("locale" ,locale)))))) - base)) + ;; If network is to be shared with the host, remove network + ;; configuration files from etc-service. + (if shared-network? + (modify-services base + (etc-service-type + files => (remove + (match-lambda + ((filename _) + (member filename + (map basename %network-configuration-files)))) + files))) + base))) -(define (containerized-operating-system os mappings) +(define* (containerized-operating-system os mappings + #:key + shared-network? + (extra-file-systems '())) "Return an operating system based on OS for use in a Linux container environment. MAPPINGS is a list of <file-system-mapping> to realize in the -containerized OS." +containerized OS. EXTRA-FILE-SYSTEMS is a list of file systems to add to OS." (define user-file-systems (remove (lambda (fs) (let ((target (file-system-mount-point fs)) @@ -65,8 +80,8 @@ containerized OS." (string=? target "/") (and (string? source) (string-prefix? "/dev/" source)) - (string-prefix? "/dev" target) - (string-prefix? "/sys" target)))) + (string-prefix? "/dev/" target) + (string-prefix? "/sys/" target)))) (operating-system-file-systems os))) (define (mapping->fs fs) @@ -76,28 +91,63 @@ containerized OS." (define useless-services ;; Services that make no sense in a container. Those that attempt to ;; access /dev/tty[0-9] in particular cannot work in a container. - (list console-font-service-type - mingetty-service-type - agetty-service-type)) + (append (list console-font-service-type + mingetty-service-type + agetty-service-type) + ;; Remove nscd service if network is shared with the host. + (if shared-network? + (list nscd-service-type) + (list)))) (operating-system (inherit os) (swap-devices '()) ; disable swap - (essential-services (container-essential-services os)) + (essential-services (container-essential-services + this-operating-system + #:shared-network? shared-network?)) (services (remove (lambda (service) (memq (service-kind service) useless-services)) (operating-system-user-services os))) - (file-systems (append (map mapping->fs (cons %store-mapping mappings)) - %container-file-systems - user-file-systems)))) + (file-systems (append (map mapping->fs mappings) + extra-file-systems + user-file-systems -(define* (container-script os #:key (mappings '())) + ;; Provide a dummy root file system so we can create + ;; a 'boot-parameters' file. + (list (file-system + (mount-point "/") + (device "nothing") + (type "dummy"))))))) + +(define* (container-script os #:key (mappings '()) shared-network?) "Return a derivation of a script that runs OS as a Linux container. MAPPINGS is a list of <file-system> objects that specify the files/directories that will be shared with the host system." - (let* ((os (containerized-operating-system os mappings)) - (file-systems (filter file-system-needed-for-boot? + (define network-mappings + ;; Files to map if network is to be shared with the host + (append %network-file-mappings + (let ((nscd-run-directory "/var/run/nscd")) + (if (file-exists? nscd-run-directory) + (list (file-system-mapping + (source nscd-run-directory) + (target nscd-run-directory))) + '())))) + + (define (mountable-file-system? file-system) + ;; Return #t if FILE-SYSTEM should be mounted in the container. + (and (not (string=? "/" (file-system-mount-point file-system))) + (file-system-needed-for-boot? file-system))) + + (let* ((os (containerized-operating-system + os + (cons %store-mapping + (if shared-network? + (append network-mappings mappings) + mappings)) + #:shared-network? shared-network? + #:extra-file-systems %container-file-systems)) + (file-systems (filter mountable-file-system? (operating-system-file-systems os))) (specs (map file-system->spec file-systems))) @@ -121,6 +171,9 @@ that will be shared with the host system." ;; users and groups, which is sufficient for most cases. ;; ;; See: http://www.freedesktop.org/software/systemd/man/systemd-nspawn.html#--private-users= - #:host-uids 65536)))) + #:host-uids 65536 + #:namespaces (if #$shared-network? + (delq 'net %namespaces) + %namespaces))))) (gexp->script "run-container" script))) |