c6f8e9dd64
* guix/scripts/archive.scm (show-help, %options): Add --extract. (guix-archive): Honor it. * tests/guix-archive.sh: Test it. * doc/guix.texi (Invoking guix archive): Document it.
345 lines
13 KiB
Scheme
345 lines
13 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2013, 2014, 2015 Ludovic Courtès <ludo@gnu.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 (guix scripts archive)
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#:use-module (guix config)
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#:use-module (guix utils)
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#:use-module ((guix build utils) #:select (mkdir-p))
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#:use-module ((guix serialization) #:select (restore-file))
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#:use-module (guix store)
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#:use-module (guix packages)
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#:use-module (guix derivations)
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#:use-module (guix monads)
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#:use-module (guix ui)
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#:use-module (guix pki)
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#:use-module (guix pk-crypto)
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#:use-module (guix scripts)
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#:use-module (guix scripts build)
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#:use-module (gnu packages)
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#:use-module (ice-9 match)
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#:use-module (ice-9 format)
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#:use-module (ice-9 rdelim)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-11)
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#:use-module (srfi srfi-26)
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#:use-module (srfi srfi-37)
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#:use-module (rnrs io ports)
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#:export (guix-archive))
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;;;
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;;; Command-line options.
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;;;
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(define %default-options
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;; Alist of default option values.
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`((system . ,(%current-system))
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(substitutes? . #t)
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(max-silent-time . 3600)
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(verbosity . 0)))
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(define (show-help)
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(display (_ "Usage: guix archive [OPTION]... PACKAGE...
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Export/import one or more packages from/to the store.\n"))
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(display (_ "
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--export export the specified files/packages to stdout"))
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(display (_ "
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-r, --recursive combined with '--export', include dependencies"))
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(display (_ "
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--import import from the archive passed on stdin"))
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(display (_ "
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--missing print the files from stdin that are missing"))
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(display (_ "
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-x, --extract=DIR extract the archive on stdin to DIR"))
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(newline)
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(display (_ "
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--generate-key[=PARAMETERS]
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generate a key pair with the given parameters"))
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(display (_ "
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--authorize authorize imports signed by the public key on stdin"))
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(newline)
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(display (_ "
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-e, --expression=EXPR build the package or derivation EXPR evaluates to"))
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(display (_ "
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-S, --source build the packages' source derivations"))
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(display (_ "
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-s, --system=SYSTEM attempt to build for SYSTEM--e.g., \"i686-linux\""))
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(display (_ "
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--target=TRIPLET cross-build for TRIPLET--e.g., \"armel-linux-gnu\""))
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(newline)
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(show-build-options-help)
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(newline)
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(display (_ "
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-h, --help display this help and exit"))
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(display (_ "
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-V, --version display version information and exit"))
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(newline)
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(show-bug-report-information))
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(define %key-generation-parameters
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;; Default key generation parameters. We prefer Ed25519, but it was
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;; introduced in libgcrypt 1.6.0.
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(if (version>? (gcrypt-version) "1.6.0")
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"(genkey (ecdsa (curve Ed25519) (flags rfc6979)))"
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"(genkey (rsa (nbits 4:4096)))"))
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(define %options
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;; Specifications of the command-line options.
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(cons* (option '(#\h "help") #f #f
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(lambda args
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(show-help)
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(exit 0)))
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(option '(#\V "version") #f #f
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(lambda args
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(show-version-and-exit "guix build")))
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(option '("export") #f #f
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(lambda (opt name arg result)
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(alist-cons 'export #t result)))
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(option '(#\r "recursive") #f #f
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(lambda (opt name arg result)
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(alist-cons 'export-recursive? #t result)))
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(option '("import") #f #f
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(lambda (opt name arg result)
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(alist-cons 'import #t result)))
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(option '("missing") #f #f
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(lambda (opt name arg result)
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(alist-cons 'missing #t result)))
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(option '("extract" #\x) #t #f
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(lambda (opt name arg result)
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(alist-cons 'extract arg result)))
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(option '("generate-key") #f #t
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(lambda (opt name arg result)
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(catch 'gcry-error
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(lambda ()
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;; XXX: Curve25519 was actually introduced in
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;; libgcrypt 1.6.0.
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(let ((params
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(string->canonical-sexp
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(or arg %key-generation-parameters))))
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(alist-cons 'generate-key params result)))
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(lambda (key proc err)
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(leave (_ "invalid key generation parameters: ~a: ~a~%")
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(error-source err)
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(error-string err))))))
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(option '("authorize") #f #f
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(lambda (opt name arg result)
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(alist-cons 'authorize #t result)))
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(option '(#\S "source") #f #f
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(lambda (opt name arg result)
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(alist-cons 'source? #t result)))
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(option '(#\s "system") #t #f
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(lambda (opt name arg result)
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(alist-cons 'system arg
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(alist-delete 'system result eq?))))
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(option '("target") #t #f
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(lambda (opt name arg result)
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(alist-cons 'target arg
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(alist-delete 'target result eq?))))
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(option '(#\e "expression") #t #f
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(lambda (opt name arg result)
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(alist-cons 'expression arg result)))
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(option '(#\n "dry-run") #f #f
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(lambda (opt name arg result)
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(alist-cons 'dry-run? #t result)))
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%standard-build-options))
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(define (derivation-from-expression store str package-derivation
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system source?)
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"Read/eval STR and return the corresponding derivation path for SYSTEM.
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When SOURCE? is true and STR evaluates to a package, return the derivation of
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the package source; otherwise, use PACKAGE-DERIVATION to compute the
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derivation of a package."
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(match (read/eval str)
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((? package? p)
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(if source?
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(let ((source (package-source p)))
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(if source
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(package-source-derivation store source)
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(leave (_ "package `~a' has no source~%")
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(package-name p))))
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(package-derivation store p system)))
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((? procedure? proc)
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(run-with-store store
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(mbegin %store-monad
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(set-guile-for-build (default-guile))
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(proc)) #:system system))))
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(define (options->derivations+files store opts)
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"Given OPTS, the result of 'args-fold', return a list of derivations to
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build and a list of store files to transfer."
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(define package->derivation
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(match (assoc-ref opts 'target)
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(#f package-derivation)
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(triplet
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(cut package-cross-derivation <> <> triplet <>))))
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(define src? (assoc-ref opts 'source?))
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(define sys (assoc-ref opts 'system))
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(fold2 (lambda (arg derivations files)
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(match arg
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(('expression . str)
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(let ((drv (derivation-from-expression store str
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package->derivation
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sys src?)))
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(values (cons drv derivations)
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(cons (derivation->output-path drv) files))))
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(('argument . (? store-path? file))
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(values derivations (cons file files)))
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(('argument . (? string? spec))
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(let-values (((p output)
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(specification->package+output spec)))
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(if src?
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(let* ((s (package-source p))
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(drv (package-source-derivation store s)))
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(values (cons drv derivations)
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(cons (derivation->output-path drv)
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files)))
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(let ((drv (package->derivation store p sys)))
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(values (cons drv derivations)
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(cons (derivation->output-path drv output)
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files))))))
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(_
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(values derivations files))))
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'()
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'()
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opts))
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;;;
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;;; Entry point.
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;;;
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(define (export-from-store store opts)
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"Export the packages or derivations specified in OPTS from STORE. Write the
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resulting archive to the standard output port."
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(let-values (((drv files)
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(options->derivations+files store opts)))
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(set-build-options-from-command-line store opts)
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(show-what-to-build store drv
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#:use-substitutes? (assoc-ref opts 'substitutes?)
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#:dry-run? (assoc-ref opts 'dry-run?))
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(if (or (assoc-ref opts 'dry-run?)
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(build-derivations store drv))
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(export-paths store files (current-output-port)
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#:recursive? (assoc-ref opts 'export-recursive?))
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(leave (_ "unable to export the given packages~%")))))
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(define (generate-key-pair parameters)
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"Generate a key pair with PARAMETERS, a canonical sexp, and store it in the
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right place."
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(when (or (file-exists? %public-key-file)
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(file-exists? %private-key-file))
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(leave (_ "key pair exists under '~a'; remove it first~%")
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(dirname %public-key-file)))
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(format (current-error-port)
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(_ "Please wait while gathering entropy to generate the key pair;
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this may take time...~%"))
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(let* ((pair (catch 'gcry-error
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(lambda ()
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(generate-key parameters))
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(lambda (key proc err)
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(leave (_ "key generation failed: ~a: ~a~%")
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(error-source err)
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(error-string err)))))
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(public (find-sexp-token pair 'public-key))
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(secret (find-sexp-token pair 'private-key)))
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;; Create the following files as #o400.
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(umask #o266)
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(mkdir-p (dirname %public-key-file))
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(with-atomic-file-output %public-key-file
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(lambda (port)
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(display (canonical-sexp->string public) port)))
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(with-atomic-file-output %private-key-file
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(lambda (port)
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(display (canonical-sexp->string secret) port)))
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;; Make the public key readable by everyone.
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(chmod %public-key-file #o444)))
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(define (authorize-key)
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"Authorize imports signed by the public key passed as an advanced sexp on
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the input port."
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(define (read-key)
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(catch 'gcry-error
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(lambda ()
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(string->canonical-sexp (get-string-all (current-input-port))))
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(lambda (key proc err)
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(leave (_ "failed to read public key: ~a: ~a~%")
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(error-source err) (error-string err)))))
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(let ((key (read-key))
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(acl (current-acl)))
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(unless (eq? 'public-key (canonical-sexp-nth-data key 0))
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(leave (_ "s-expression does not denote a public key~%")))
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;; Add KEY to the ACL and write that.
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(let ((acl (public-keys->acl (cons key (acl->public-keys acl)))))
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(mkdir-p (dirname %acl-file))
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(with-atomic-file-output %acl-file
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(cut write-acl acl <>)))))
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(define (guix-archive . args)
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(define (lines port)
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;; Return lines read from PORT.
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(let loop ((line (read-line port))
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(result '()))
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(if (eof-object? line)
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(reverse result)
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(loop (read-line port)
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(cons line result)))))
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(with-error-handling
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;; Ask for absolute file names so that .drv file names passed from the
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;; user to 'read-derivation' are absolute when it returns.
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(with-fluids ((%file-port-name-canonicalization 'absolute))
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(let ((opts (parse-command-line args %options (list %default-options))))
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(cond ((assoc-ref opts 'generate-key)
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=>
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generate-key-pair)
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((assoc-ref opts 'authorize)
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(authorize-key))
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(else
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(let ((store (open-connection)))
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(cond ((assoc-ref opts 'export)
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(export-from-store store opts))
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((assoc-ref opts 'import)
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(import-paths store (current-input-port)))
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((assoc-ref opts 'missing)
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(let* ((files (lines (current-input-port)))
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(missing (remove (cut valid-path? store <>)
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files)))
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(format #t "~{~a~%~}" missing)))
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((assoc-ref opts 'extract)
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=>
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(lambda (target)
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(restore-file (current-input-port) target)))
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(else
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(leave
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(_ "either '--export' or '--import' \
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must be specified~%")))))))))))
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