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download: Download a nar when a VCS checkout fails.

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Fixes <https://bugs.gnu.org/28709>.

* guix/build/download-nar.scm: New file.
* Makefile.am (MODULES): Add it.
* guix/cvs-download.scm (cvs-fetch)[zlib, config.scm, modules]: New
variables.
[build]: Use MODULES.  Add call to 'download-nar'.
* guix/git-download.scm (git-fetch): Likewise.
* guix/hg-download.scm (hg-fetch): Likewise.
This commit is contained in:
Ludovic Courtès 2017-10-17 10:34:03 +02:00 committed by Ludovic Courtès
parent 8c3488259e
commit 37ce440dcf
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GPG key ID: 090B11993D9AEBB5
5 changed files with 211 additions and 26 deletions
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1
Makefile.am
View file

@ -106,6 +106,7 @@ MODULES = \
guix/ui.scm \
guix/build/ant-build-system.scm \
guix/build/download.scm \
guix/build/download-nar.scm \
guix/build/cargo-build-system.scm \
guix/build/cmake-build-system.scm \
guix/build/dub-build-system.scm \

125
guix/build/download-nar.scm Normal file
View file

@ -0,0 +1,125 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2017 Ludovic Courtès <ludo@gnu.org>
;;;
;;; 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 build download-nar)
#:use-module (guix build download)
#:use-module (guix build utils)
#:use-module (guix serialization)
#:use-module (guix zlib)
#:use-module (guix progress)
#:use-module (web uri)
#:use-module (srfi srfi-11)
#:use-module (srfi srfi-26)
#:use-module (ice-9 format)
#:use-module (ice-9 match)
#:export (download-nar))
;;; Commentary:
;;;
;;; Download a normalized archive or "nar", similar to what 'guix substitute'
;;; does. The intent here is to use substitute servers as content-addressed
;;; mirrors of VCS checkouts. This is mostly useful for users who have
;;; disabled substitutes.
;;;
;;; Code:
(define (urls-for-item item)
"Return the fallback nar URL for ITEM--e.g.,
\"/gnu/store/cabbag3…-foo-1.2-checkout\"."
;; Here we hard-code nar URLs without checking narinfos. That's probably OK
;; though.
;; TODO: Use HTTPS? The downside is the extra dependency.
(let ((bases '("http://mirror.hydra.gnu.org/guix"
"http://berlin.guixsd.org"))
(item (basename item)))
(append (map (cut string-append <> "/nar/gzip/" item) bases)
(map (cut string-append <> "/nar/" item) bases))))
(define (restore-gzipped-nar port item size)
"Restore the gzipped nar read from PORT, of SIZE bytes (compressed), to
ITEM."
;; Since PORT is typically a non-file port (for instance because 'http-get'
;; returns a delimited port), create a child process so we're back to a file
;; port that can be passed to 'call-with-gzip-input-port'.
(match (pipe)
((input . output)
(match (primitive-fork)
(0
(dynamic-wind
(const #t)
(lambda ()
(close-port output)
(close-port port)
(catch #t
(lambda ()
(call-with-gzip-input-port input
(cut restore-file <> item)))
(lambda (key . args)
(print-exception (current-error-port)
(stack-ref (make-stack #t) 1)
key args)
(primitive-exit 1))))
(lambda ()
(primitive-exit 0))))
(child
(close-port input)
(dump-port* port output
#:reporter (progress-reporter/file item size
#:abbreviation
store-path-abbreviation))
(close-port output)
(newline)
(match (waitpid child)
((_ . status)
(unless (zero? status)
(error "nar decompression failed" status)))))))))
(define (download-nar item)
"Download and extract the normalized archive for ITEM. Return #t on
success, #f otherwise."
;; Let progress reports go through.
(setvbuf (current-error-port) _IONBF)
(setvbuf (current-output-port) _IONBF)
(let loop ((urls (urls-for-item item)))
(match urls
((url rest ...)
(format #t "Trying content-addressed mirror at ~a...~%"
(uri-host (string->uri url)))
(let-values (((port size)
(catch #t
(lambda ()
(http-fetch (string->uri url)))
(lambda args
(values #f #f)))))
(if (not port)
(loop rest)
(begin
(if size
(format #t "Downloading from ~a (~,2h MiB)...~%" url
(/ size (expt 2 20.)))
(format #t "Downloading from ~a...~%" url))
(if (string-contains url "/gzip")
(restore-gzipped-nar port item size)
(begin
;; FIXME: Add progress report.
(restore-file port item)
(close-port port)))
#t))))
(()
#f))))

38
guix/cvs-download.scm
View file

@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014, 2015, 2016 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2014 Sree Harsha Totakura <sreeharsha@totakura.in>
;;; Copyright © 2015 Mark H Weaver <mhw@netris.org>
;;;
@ -23,6 +23,7 @@ (define-module (guix cvs-download)
#:use-module (guix gexp)
#:use-module (guix store)
#:use-module (guix monads)
#:use-module (guix modules)
#:use-module (guix packages)
#:use-module (ice-9 match)
#:export (cvs-reference
@ -59,16 +60,35 @@ (define* (cvs-fetch ref hash-algo hash
"Return a fixed-output derivation that fetches REF, a <cvs-reference>
object. The output is expected to have recursive hash HASH of type
HASH-ALGO (a symbol). Use NAME as the file name, or a generic name if #f."
(define zlib
(module-ref (resolve-interface '(gnu packages compression)) 'zlib))
(define config.scm
(scheme-file "config.scm"
#~(begin
(define-module (guix config)
#:export (%libz))
(define %libz
#+(file-append zlib "/lib/libz")))))
(define modules
(cons `((guix config) => ,config.scm)
(delete '(guix config)
(source-module-closure '((guix build cvs)
(guix build download-nar))))))
(define build
(with-imported-modules '((guix build cvs)
(guix build utils))
(with-imported-modules modules
#~(begin
(use-modules (guix build cvs))
(cvs-fetch '#$(cvs-reference-root-directory ref)
'#$(cvs-reference-module ref)
'#$(cvs-reference-revision ref)
#$output
#:cvs-command (string-append #+cvs "/bin/cvs")))))
(use-modules (guix build cvs)
(guix build download-nar))
(or (cvs-fetch '#$(cvs-reference-root-directory ref)
'#$(cvs-reference-module ref)
'#$(cvs-reference-revision ref)
#$output
#:cvs-command (string-append #+cvs "/bin/cvs"))
(download-nar #$output)))))
(mlet %store-monad ((guile (package->derivation guile system)))
(gexp->derivation (or name "cvs-checkout") build

37
guix/git-download.scm
View file

@ -25,6 +25,7 @@ (define-module (guix git-download)
#:use-module (guix monads)
#:use-module (guix records)
#:use-module (guix packages)
#:use-module (guix modules)
#:autoload (guix build-system gnu) (standard-packages)
#:use-module (ice-9 match)
#:use-module (ice-9 popen)
@ -77,12 +78,31 @@ (define inputs
(standard-packages)
'()))
(define zlib
(module-ref (resolve-interface '(gnu packages compression)) 'zlib))
(define config.scm
(scheme-file "config.scm"
#~(begin
(define-module (guix config)
#:export (%libz))
(define %libz
#+(file-append zlib "/lib/libz")))))
(define modules
(cons `((guix config) => ,config.scm)
(delete '(guix config)
(source-module-closure '((guix build git)
(guix build utils)
(guix build download-nar))))))
(define build
(with-imported-modules '((guix build git)
(guix build utils))
(with-imported-modules modules
#~(begin
(use-modules (guix build git)
(guix build utils)
(guix build download-nar)
(ice-9 match))
;; The 'git submodule' commands expects Coreutils, sed,
@ -92,12 +112,13 @@ (define build
(((names dirs) ...)
dirs)))
(git-fetch (getenv "git url") (getenv "git commit")
#$output
#:recursive? (call-with-input-string
(getenv "git recursive?")
read)
#:git-command (string-append #+git "/bin/git")))))
(or (git-fetch (getenv "git url") (getenv "git commit")
#$output
#:recursive? (call-with-input-string
(getenv "git recursive?")
read)
#:git-command (string-append #+git "/bin/git"))
(download-nar #$output)))))
(mlet %store-monad ((guile (package->derivation guile system)))
(gexp->derivation (or name "git-checkout") build

36
guix/hg-download.scm
View file

@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014, 2015, 2016 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2016 Ricardo Wurmus <rekado@elephly.net>
;;;
;;; This file is part of GNU Guix.
@ -22,6 +22,7 @@ (define-module (guix hg-download)
#:use-module (guix store)
#:use-module (guix monads)
#:use-module (guix records)
#:use-module (guix modules)
#:use-module (guix packages)
#:autoload (guix build-system gnu) (standard-packages)
#:use-module (ice-9 match)
@ -59,18 +60,35 @@ (define* (hg-fetch ref hash-algo hash
"Return a fixed-output derivation that fetches REF, a <hg-reference>
object. The output is expected to have recursive hash HASH of type
HASH-ALGO (a symbol). Use NAME as the file name, or a generic name if #f."
(define zlib
(module-ref (resolve-interface '(gnu packages compression)) 'zlib))
(define config.scm
(scheme-file "config.scm"
#~(begin
(define-module (guix config)
#:export (%libz))
(define %libz
#+(file-append zlib "/lib/libz")))))
(define modules
(cons `((guix config) => ,config.scm)
(delete '(guix config)
(source-module-closure '((guix build hg)
(guix build download-nar))))))
(define build
(with-imported-modules '((guix build hg)
(guix build utils))
(with-imported-modules modules
#~(begin
(use-modules (guix build hg)
(guix build utils)
(ice-9 match))
(guix build download-nar))
(hg-fetch '#$(hg-reference-url ref)
'#$(hg-reference-changeset ref)
#$output
#:hg-command (string-append #+hg "/bin/hg")))))
(or (hg-fetch '#$(hg-reference-url ref)
'#$(hg-reference-changeset ref)
#$output
#:hg-command (string-append #+hg "/bin/hg"))
(download-nar #$output)))))
(mlet %store-monad ((guile (package->derivation guile system)))
(gexp->derivation (or name "hg-checkout") build