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| | ;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014, 2016, 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 git)
#:use-module (web uri)
#:use-module (web client)
#:use-module (web response)
#:use-module (guix serialization)
#:use-module (guix build utils)
#:use-module (srfi srfi-11)
#:use-module (ice-9 format)
#:use-module (ice-9 match)
#:export (git-fetch))
;;; Commentary:
;;;
;;; This is the build-side support code of (guix git-download). It allows a
;;; Git repository to be cloned and checked out at a specific commit.
;;;
;;; Code:
(define (urls-for-item item)
"Return the fallback nar URL for ITEM--e.g., \"cabbag3…-foo-1.2-checkout\"."
;; TODO: Use the /gzip URLs, make it configurable, and use TLS.
(list (string-append "http://mirror.hydra.gnu.org/guix/nar/" item)
(string-append "http://berlin.guixsd.org/nar/" item)))
(define (download-nar item directory)
"Download Git checkout ITEM to DIRECTORY as a nar."
(setvbuf (current-output-port) _IONBF)
(setvbuf (current-error-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 (((response port)
(http-get url #:streaming? #t)))
(if (= 200 (response-code response))
(let ((size (response-content-length response)))
(if size
(format #t "Downloading from ~a (~,2h MiB)...~%"
url (/ size (expt 2 20.)))
(format #t "Downloading from ~a...~%" url))
(restore-file port directory)
(close-port port)
#t)
(loop rest))))
(()
#f))))
(define* (git-fetch url commit directory
#:key (git-command "git") recursive?)
"Fetch COMMIT from URL into DIRECTORY. COMMIT must be a valid Git commit
identifier. When RECURSIVE? is true, all the sub-modules of URL are fetched,
recursively. Return #t on success, #f otherwise."
;; Disable TLS certificate verification. The hash of the checkout is known
;; in advance anyway.
(setenv "GIT_SSL_NO_VERIFY" "true")
;; We cannot use "git clone --recursive" since the following "git checkout"
;; effectively removes sub-module checkouts as of Git 2.6.3.
(if (zero? (system* git-command "clone" url directory))
(with-directory-excursion directory
(system* git-command "tag" "-l")
(and (zero? (system* git-command "checkout" commit))
(begin
(when recursive?
;; Now is the time to fetch sub-modules.
(unless (zero? (system* git-command "submodule" "update"
"--init" "--recursive"))
(error "failed to fetch sub-modules" url))
;; In sub-modules, '.git' is a flat file, not a directory,
;; so we can use 'find-files' here.
(for-each delete-file-recursively
(find-files directory "^\\.git$")))
;; The contents of '.git' vary as a function of the current
;; status of the Git repo. Since we want a fixed output, this
;; directory needs to be taken out.
(delete-file-recursively ".git")
#t)))
(download-nar (basename directory) directory)))
;;; git.scm ends here
|