guix: Rewrite build-docker-image to allow more paths.
* guix/docker.scm (build-docker-image): Rename "path" argument to "prefix" to reflect the fact that it is used as a prefix for the symlink targets. Add the "paths" argument, and remove the "closure" argument, since it is now redundant. Add a "transformations" argument. * guix/scripts/pack.scm (docker-image): Read the profile's reference graph and provide its paths to build-docker-image via the new "paths" argument.
This commit is contained in:
Chris Marusich
parent
8c9bf2946a
commit
1c2ac6b482
190
guix/docker.scm
190
guix/docker.scm
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@ -1,6 +1,7 @@
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;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2017 Ricardo Wurmus <rekado@elephly.net>
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;;; Copyright © 2017 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2018 Chris Marusich <cmmarusich@gmail.com>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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@ -23,9 +24,12 @@
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#:use-module ((guix build utils)
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#:select (mkdir-p
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delete-file-recursively
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with-directory-excursion))
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#:use-module (guix build store-copy)
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with-directory-excursion
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invoke))
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#:use-module (srfi srfi-19)
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#:use-module (srfi srfi-26)
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#:use-module ((texinfo string-utils)
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#:select (escape-special-chars))
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#:use-module (rnrs bytevectors)
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#:use-module (ice-9 match)
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#:export (build-docker-image))
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@ -33,8 +37,7 @@
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;; Load Guile-JSON at run time to simplify the job of 'imported-modules' & co.
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(module-use! (current-module) (resolve-interface '(json)))
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;; Generate a 256-bit identifier in hexadecimal encoding for the Docker image
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;; containing the closure at PATH.
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;; Generate a 256-bit identifier in hexadecimal encoding for the Docker image.
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(define docker-id
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(compose bytevector->base16-string sha256 string->utf8))
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@ -102,82 +105,123 @@ return \"a\"."
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((first rest ...)
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first)))
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(define* (build-docker-image image path
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#:key closure compressor
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(define* (build-docker-image image paths prefix
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#:key
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(symlinks '())
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(transformations '())
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(system (utsname:machine (uname)))
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compressor
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(creation-time (current-time time-utc)))
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"Write to IMAGE a Docker image archive from the given store PATH. The image
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contains the closure of PATH, as specified in CLOSURE (a file produced by
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#:references-graphs). SYMLINKS must be a list of (SOURCE -> TARGET) tuples
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describing symlinks to be created in the image, where each TARGET is relative
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to PATH. SYSTEM is a GNU triplet (or prefix thereof) of the system the
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binaries at PATH are for; it is used to produce metadata in the image.
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"Write to IMAGE a Docker image archive containing the given PATHS. PREFIX
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must be a store path that is a prefix of any store paths in PATHS.
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Use COMPRESSOR, a command such as '(\"gzip\" \"-9n\"), to compress IMAGE. Use
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CREATION-TIME, a SRFI-19 time-utc object, as the creation time in metadata."
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(let ((directory "/tmp/docker-image") ;temporary working directory
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(closure (canonicalize-path closure))
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(id (docker-id path))
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(time (date->string (time-utc->date creation-time) "~4"))
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(arch (let-syntax ((cond* (syntax-rules ()
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((_ (pattern clause) ...)
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(cond ((string-prefix? pattern system)
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clause)
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...
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(else
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(error "unsupported system"
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system)))))))
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(cond* ("x86_64" "amd64")
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("i686" "386")
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("arm" "arm")
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("mips64" "mips64le")))))
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SYMLINKS must be a list of (SOURCE -> TARGET) tuples describing symlinks to be
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created in the image, where each TARGET is relative to PREFIX.
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TRANSFORMATIONS must be a list of (OLD -> NEW) tuples describing how to
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transform the PATHS. Any path in PATHS that begins with OLD will be rewritten
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in the Docker image so that it begins with NEW instead. If a path is a
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non-empty directory, then its contents will be recursively added, as well.
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SYSTEM is a GNU triplet (or prefix thereof) of the system the binaries in
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PATHS are for; it is used to produce metadata in the image. Use COMPRESSOR, a
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command such as '(\"gzip\" \"-9n\"), to compress IMAGE. Use CREATION-TIME, a
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SRFI-19 time-utc object, as the creation time in metadata."
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(define (sanitize path-fragment)
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(escape-special-chars
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;; GNU tar strips the leading slash off of absolute paths before applying
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;; the transformations, so we need to do the same, or else our
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;; replacements won't match any paths.
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(string-trim path-fragment #\/)
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;; Escape the basic regexp special characters (see: "(sed) BRE syntax").
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;; We also need to escape "/" because we use it as a delimiter.
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"/*.^$[]\\"
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#\\))
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(define transformation->replacement
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(match-lambda
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((old '-> new)
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;; See "(tar) transform" for details on the expression syntax.
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(string-append "s/^" (sanitize old) "/" (sanitize new) "/"))))
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(define (transformations->expression transformations)
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(let ((replacements (map transformation->replacement transformations)))
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(string-append
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;; Avoid transforming link targets, since that would break some links
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;; (e.g., symlinks that point to an absolute store path).
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"flags=rSH;"
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(string-join replacements ";")
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;; Some paths might still have a leading path delimiter even after tar
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;; transforms them (e.g., "/a/b" might be transformed into "/b"), so
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;; strip any leading path delimiters that remain.
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";s,^//*,,")))
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(define transformation-options
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(if (eq? '() transformations)
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'()
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`("--transform" ,(transformations->expression transformations))))
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(let* ((directory "/tmp/docker-image") ;temporary working directory
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(id (docker-id prefix))
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(time (date->string (time-utc->date creation-time) "~4"))
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(arch (let-syntax ((cond* (syntax-rules ()
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((_ (pattern clause) ...)
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(cond ((string-prefix? pattern system)
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clause)
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...
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(else
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(error "unsupported system"
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system)))))))
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(cond* ("x86_64" "amd64")
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("i686" "386")
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("arm" "arm")
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("mips64" "mips64le")))))
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;; Make sure we start with a fresh, empty working directory.
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(mkdir directory)
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(with-directory-excursion directory
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(mkdir id)
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(with-directory-excursion id
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(with-output-to-file "VERSION"
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(lambda () (display schema-version)))
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(with-output-to-file "json"
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(lambda () (scm->json (image-description id time))))
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(and (with-directory-excursion directory
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(mkdir id)
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(with-directory-excursion id
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(with-output-to-file "VERSION"
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(lambda () (display schema-version)))
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(with-output-to-file "json"
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(lambda () (scm->json (image-description id time))))
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;; Create SYMLINKS.
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(for-each (match-lambda
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((source '-> target)
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(let ((source (string-trim source #\/)))
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(mkdir-p (dirname source))
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(symlink (string-append prefix "/" target)
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source))))
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symlinks)
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;; Wrap it up.
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(let ((items (call-with-input-file closure
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read-reference-graph)))
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;; Create SYMLINKS.
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(for-each (match-lambda
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((source '-> target)
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(let ((source (string-trim source #\/)))
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(mkdir-p (dirname source))
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(symlink (string-append path "/" target)
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source))))
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symlinks)
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(apply invoke "tar" "-cf" "layer.tar"
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`(,@transformation-options
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,@%tar-determinism-options
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,@paths
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,@(map symlink-source symlinks)))
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;; It is possible for "/" to show up in the archive, especially when
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;; applying transformations. For example, the transformation
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;; "s,^/a,," will (perhaps surprisingly) cause GNU tar to transform
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;; the path "/a" into "/". The presence of "/" in the archive is
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;; probably benign, but it is definitely safe to remove it, so let's
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;; do that. This fails when "/" is not in the archive, so use system*
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;; instead of invoke to avoid an exception in that case.
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(system* "tar" "--delete" "/" "-f" "layer.tar")
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(for-each delete-file-recursively
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(map (compose topmost-component symlink-source)
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symlinks)))
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(and (zero? (apply system* "tar" "-cf" "layer.tar"
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(append %tar-determinism-options
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items
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(map symlink-source symlinks))))
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(for-each delete-file-recursively
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(map (compose topmost-component symlink-source)
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symlinks)))))
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(with-output-to-file "config.json"
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(lambda ()
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(scm->json (config (string-append id "/layer.tar")
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time arch))))
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(with-output-to-file "manifest.json"
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(lambda ()
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(scm->json (manifest prefix id))))
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(with-output-to-file "repositories"
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(lambda ()
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(scm->json (repositories prefix id)))))
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(with-output-to-file "config.json"
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(lambda ()
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(scm->json (config (string-append id "/layer.tar")
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time arch))))
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(with-output-to-file "manifest.json"
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(lambda ()
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(scm->json (manifest path id))))
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(with-output-to-file "repositories"
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(lambda ()
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(scm->json (repositories path id)))))
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(and (zero? (apply system* "tar" "-C" directory "-cf" image
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`(,@%tar-determinism-options
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,@(if compressor
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(list "-I" (string-join compressor))
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'())
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".")))
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(begin (delete-file-recursively directory) #t)))))
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(apply invoke "tar" "-cf" image "-C" directory
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`(,@%tar-determinism-options
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,@(if compressor
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(list "-I" (string-join compressor))
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'())
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"."))
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(delete-file-recursively directory)))
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@ -238,6 +238,7 @@ the image."
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(define build
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(with-imported-modules `(,@(source-module-closure '((guix docker))
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#:select? not-config?)
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(guix build store-copy)
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((guix config) => ,config))
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#~(begin
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;; Guile-JSON is required by (guix docker).
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@ -245,13 +246,15 @@ the image."
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(string-append #+json "/share/guile/site/"
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(effective-version)))
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(use-modules (guix docker) (srfi srfi-19))
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(use-modules (guix docker) (srfi srfi-19) (guix build store-copy))
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(setenv "PATH" (string-append #$tar "/bin"))
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(build-docker-image #$output #$profile
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(build-docker-image #$output
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(call-with-input-file "profile"
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read-reference-graph)
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#$profile
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#:system (or #$target (utsname:machine (uname)))
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#:closure "profile"
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#:symlinks '#$symlinks
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#:compressor '#$(compressor-command compressor)
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#:creation-time (make-time time-utc 0 1)))))
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