;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2014 Sree Harsha Totakura <sreeharsha@totakura.in>
;;; Copyright © 2018 Mark H Weaver <mhw@netris.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 svn)
  #:use-module (guix build utils)
  #:export (svn-fetch))

;;; Commentary:
;;;
;;; This is the build-side support code of (guix svn-download).  It allows a
;;; Subversion repository to be cloned and checked out at a specific revision.
;;;
;;; Code:

(define* (svn-fetch url revision directory
                    #:key (svn-command "svn")
                    (user-name #f)
                    (password #f))
  "Fetch REVISION from URL into DIRECTORY.  REVISION must be an integer, and a
valid Subversion revision.  Return #t on success, #f otherwise."
  (apply invoke svn-command
         "checkout" "--non-interactive"
         ;; Trust the server certificate.  This is OK as we
         ;; verify the checksum later.  This can be removed when
         ;; ca-certificates package is added.
         "--trust-server-cert" "-r" (number->string revision)
         `(,@(if (and user-name password)
                 (list (string-append "--username=" user-name)
                       (string-append "--password=" password))
                 '())
           ,url ,directory))

  ;; The contents of '.svn' vary as a function of the current status
  ;; of the repo.  Since we want a fixed output, this directory needs
  ;; to be taken out.
  (with-directory-excursion directory
    (for-each delete-file-recursively (find-files "." "^\\.svn$" #:directories? #t)))

  #t)

;;; svn.scm ends here