pack: Add support for squashfs images.
* guix/scripts/pack.scm (%formats): Add "squashfs" format. (guix-pack): Adjust "archiver" dependent on pack-format. (squashfs-image): New procedure. * doc/guix.texi (Invoking guix pack): Document it.
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Ricardo Wurmus
Ricardo Wurmus
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@ -2856,6 +2856,22 @@ command. See the
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@uref{https://docs.docker.com/engine/reference/commandline/load/, Docker
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documentation} for more information.
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@cindex Singularity, build an image with guix pack
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@cindex SquashFS, build an image with guix pack
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Yet another option is to produce a SquashFS image with the following
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command:
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@example
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guix pack -f squashfs guile emacs geiser
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@end example
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@noindent
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The result is a SquashFS file system image that can either be mounted or
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directly be used as a file system container image with the
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@uref{http://singularity.lbl.gov, Singularity container execution
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environment}, using commands like @command{singularity shell} or
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@command{singularity exec}.
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Several command-line options allow you to customize your pack:
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@table @code
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@ -2874,6 +2890,11 @@ specified binaries and symlinks.
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This produces a tarball that follows the
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@uref{https://github.com/docker/docker/blob/master/image/spec/v1.2.md,
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Docker Image Specification}.
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@item squashfs
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This produces a SquashFS image containing all the specified binaries and
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symlinks, as well as empty mount points for virtual file systems like
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procfs.
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@end table
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@item --relocatable
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@ -1,7 +1,7 @@
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;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2015, 2017, 2018 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2017 Efraim Flashner <efraim@flashner.co.il>
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;;; Copyright © 2017 Ricardo Wurmus <rekado@elephly.net>
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;;; Copyright © 2017, 2018 Ricardo Wurmus <rekado@elephly.net>
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;;; Copyright © 2018 Konrad Hinsen <konrad.hinsen@fastmail.net>
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;;; Copyright © 2018 Chris Marusich <cmmarusich@gmail.com>
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;;;
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@ -214,6 +214,90 @@ added to the pack."
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build
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#:references-graphs `(("profile" ,profile))))
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(define* (squashfs-image name profile
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#:key target
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deduplicate?
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(compressor (first %compressors))
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localstatedir?
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(symlinks '())
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(archiver squashfs-tools-next))
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"Return a squashfs image containing a store initialized with the closure of
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PROFILE, a derivation. The image contains a subset of /gnu/store, empty mount
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points for virtual file systems (like procfs), and optional symlinks.
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SYMLINKS must be a list of (SOURCE -> TARGET) tuples denoting symlinks to be
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added to the pack."
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(define build
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(with-imported-modules '((guix build utils)
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(guix build store-copy)
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(gnu build install))
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#~(begin
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(use-modules (guix build utils)
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(gnu build install)
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(guix build store-copy)
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(srfi srfi-1)
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(srfi srfi-26)
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(ice-9 match))
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(setenv "PATH" (string-append #$archiver "/bin"))
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;; We need an empty file in order to have a valid file argument when
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;; we reparent the root file system. Read on for why that's
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;; necessary.
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(with-output-to-file ".empty" (lambda () (display "")))
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;; Create the squashfs image in several steps.
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;; Add all store items. Unfortunately mksquashfs throws away all
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;; ancestor directories and only keeps the basename. We fix this
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;; in the following invocations of mksquashfs.
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(apply invoke "mksquashfs"
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`(,@(call-with-input-file "profile"
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read-reference-graph)
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,#$output
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;; Do not perform duplicate checking because we
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;; don't have any dupes.
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"-no-duplicates"
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"-comp"
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,#+(compressor-name compressor)))
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;; Here we reparent the store items. For each sub-directory of
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;; the store prefix we need one invocation of "mksquashfs".
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(for-each (lambda (dir)
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(apply invoke "mksquashfs"
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`(".empty"
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,#$output
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"-root-becomes" ,dir)))
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(reverse (string-tokenize (%store-directory)
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(char-set-complement (char-set #\/)))))
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;; Add symlinks and mount points.
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(apply invoke "mksquashfs"
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`(".empty"
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,#$output
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;; Create SYMLINKS via pseudo file definitions.
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,@(append-map
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(match-lambda
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((source '-> target)
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(list "-p"
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(string-join
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;; name s mode uid gid symlink
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(list source
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"s" "777" "0" "0"
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(string-append #$profile "/" target))))))
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'#$symlinks)
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;; Create empty mount points.
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"-p" "/proc d 555 0 0"
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"-p" "/sys d 555 0 0"
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"-p" "/dev d 555 0 0")))))
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(gexp->derivation (string-append name
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(compressor-extension compressor)
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".squashfs")
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build
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#:references-graphs `(("profile" ,profile))))
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(define* (docker-image name profile
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#:key target
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deduplicate?
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@ -462,6 +546,7 @@ please email '~a'~%")
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(define %formats
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;; Supported pack formats.
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`((tarball . ,self-contained-tarball)
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(squashfs . ,squashfs-image)
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(docker . ,docker-image)))
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(define %options
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@ -626,9 +711,11 @@ Create a bundle of PACKAGE.\n"))
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(compressor (if bootstrap?
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bootstrap-xz
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(assoc-ref opts 'compressor)))
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(archiver (if bootstrap?
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(archiver (if (equal? pack-format 'squashfs)
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squashfs-tools-next
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(if bootstrap?
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%bootstrap-coreutils&co
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tar))
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tar)))
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(symlinks (assoc-ref opts 'symlinks))
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(build-image (match (assq-ref %formats pack-format)
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((? procedure? proc) proc)
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