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| | ;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014, 2015, 2016, 2017, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2017 Mathieu Lirzin <mthl@gnu.org>
;;; Copyright © 2017 Christopher Baines <mail@cbaines.net>
;;; Copyright © 2020 Jakub Kądziołka <kuba@kadziolka.net>
;;; Copyright © 2020 Hartmut Goebel <h.goebel@crazy-compilers.com>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (guix extracting-download)
#:use-module (ice-9 match)
#:use-module (ice-9 popen)
#:use-module ((guix build download) #:prefix build:)
#:use-module ((guix build utils) #:hide (delete))
#:use-module (guix gexp)
#:use-module (guix modules)
#:use-module (guix monads)
#:use-module (guix packages) ;; for %current-system
#:use-module (guix store)
#:use-module (guix utils)
#:use-module (srfi srfi-26)
#:export (http-fetch/extract
download-to-store/extract))
;;;
;;; Produce fixed-output derivations with data extracted from n archive
;;; fetched over HTTP or FTP.
;;;
;;; This is meant to be used for package repositories where the actual source
;;; archive is packed into another archive, eventually carrying meta-data.
;;; Using this derivation saves both storing the outer archive and extracting
;;; the actual one at build time. The hash is calculated on the actual
;;; archive to ease validating the stored file.
;;;
(define* (http-fetch/extract url filename-to-extract hash-algo hash
#:optional name
#:key (system (%current-system)) (guile (default-guile)))
"Return a fixed-output derivation that fetches an archive at URL, and
extracts FILE_TO_EXTRACT from the archive. The FILE_TO_EXTRACT is expected to
have hash HASH of type HASH-ALGO (a symbol). By default, the file name is the
base name of URL; optionally, NAME can specify a different file name."
(define file-name
(match url
((head _ ...)
(basename head))
(_
(basename url))))
(define guile-zlib
(module-ref (resolve-interface '(gnu packages guile)) 'guile-zlib))
(define guile-json
(module-ref (resolve-interface '(gnu packages guile)) 'guile-json-4))
(define gnutls
(module-ref (resolve-interface '(gnu packages tls)) 'gnutls))
(define inputs
`(("tar" ,(module-ref (resolve-interface '(gnu packages base))
'tar))))
(define config.scm
(scheme-file "config.scm"
#~(begin
(define-module (guix config)
#:export (%system))
(define %system
#$(%current-system)))))
(define modules
(cons `((guix config) => ,config.scm)
(delete '(guix config)
(source-module-closure '((guix build download)
(guix build utils)
(guix utils)
(web uri))))))
(define build
(with-imported-modules modules
(with-extensions (list guile-json gnutls ;for (guix swh)
guile-zlib)
#~(begin
(use-modules (guix build download)
(guix build utils)
(guix utils)
(web uri)
(ice-9 match)
(ice-9 popen))
;; The code below expects tar to be in $PATH.
(set-path-environment-variable "PATH" '("bin")
(match '#+inputs
(((names dirs outputs ...) ...)
dirs)))
(setvbuf (current-output-port) 'line)
(setvbuf (current-error-port) 'line)
(call-with-temporary-directory
(lambda (directory)
;; TODO: Support different archive types, based on content-type
;; or archive name extention.
(let* ((file-to-extract (getenv "extract filename"))
(port (http-fetch (string->uri (getenv "download url"))
#:verify-certificate? #f))
(tar (open-pipe* OPEN_WRITE "tar" "-C" directory
"-xf" "-" file-to-extract)))
(dump-port port tar)
(close-port port)
(let ((status (close-pipe tar)))
(unless (zero? status)
(error "tar extraction failure" status)))
(copy-file (string-append directory "/"
(getenv "extract filename"))
#$output))))))))
(mlet %store-monad ((guile (package->derivation guile system)))
(gexp->derivation (or name file-name) build
;; Use environment variables and a fixed script name so
;; there's only one script in store for all the
;; downloads.
#:script-name "extract-download"
#:env-vars
`(("download url" . ,url)
("extract filename" . ,filename-to-extract))
#:leaked-env-vars '("http_proxy" "https_proxy"
"LC_ALL" "LC_MESSAGES" "LANG"
"COLUMNS")
#:system system
#:local-build? #t ; don't offload download
#:hash-algo hash-algo
#:hash hash
#:guile-for-build guile)))
(define* (download-to-store/extract store url filename-to-extract
#:optional (name (basename url))
#:key (log (current-error-port))
(verify-certificate? #t))
"Download an archive from URL, and extracts FILE_TO_EXTRACT from the archive
to STORE, either under NAME or URL's basename if omitted. Write progress
reports to LOG. VERIFY-CERTIFICATE? determines whether or not to validate
HTTPS server certificates."
(call-with-temporary-output-file
(lambda (temp port)
(let ((result
(parameterize ((current-output-port log))
(build:url-fetch url temp
;;#:mirrors %mirrors
#:verify-certificate?
verify-certificate?))))
(close port)
(and result
(call-with-temporary-output-file
(lambda (contents port)
(let ((tar (open-pipe* OPEN_READ
"tar" ;"--auto-compress"
"-xf" temp "--to-stdout" filename-to-extract)))
(dump-port tar port)
(close-port port)
(let ((status (close-pipe tar)))
(unless (zero? status)
(error "tar extraction failure" status)))
(add-to-store store name #f "sha256" contents)))))))))
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