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| | ;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014 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 (guix build utils)
#: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* (git-fetch url commit directory
#:key tag (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")
(mkdir directory)
(with-directory-excursion directory
(and (zero? (system* git-command "init"))
(zero? (system* git-command "remote" "add" "origin" url))
(cond
;; If there's a tag, do a shallow fetch. Otherwise we do a full
;; fetch.
(tag
(and (zero? (system* git-command "fetch" "--depth=1" "origin" tag))
;; Either there is no commit specified, in which case we are
;; good, or there is a commit and it is the same as the tag,
;; in which case we're still good, or there's a commit and
;; it's under the tag so we have to unshallow the checkout and
;; try again.
(if commit
(or (zero? (system* git-command "checkout" commit))
(and (zero? (system* git-command "fetch" "--unshallow"))
(zero? (system* git-command "checkout" commit))))
(zero? (system* git-command "checkout" "FETCH_HEAD")))))
(else
;; Fall back to a full fetch. In that case print available tags.
(and (zero? (system* git-command "fetch" "origin"))
(zero? (system* git-command "tag" "-l"))
(zero? (system* git-command "checkout" commit)))))
(or (not recursive?)
(zero? (system* git-command
"submodule" "update" "--init" "--recursive")))
(begin
;; 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")
(when recursive?
;; 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$")))
#t))))
;;; git.scm ends here
|