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;;; 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>
;;; Copyright © 2020 Simon Tournier <zimon.toutoune@gmail.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 build svn)
  #:use-module (guix build utils)
  #:use-module (srfi srfi-34)
  #:use-module (ice-9 format)
  #: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")
                    (recursive? #t)
                    (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."
  (mkdir-p directory)

  (guard (c ((invoke-error? c)
             (format (current-error-port)
                     "svn-fetch: '~a~{ ~a~}' failed with exit code ~a~%"
                     (invoke-error-program c)
                     (invoke-error-arguments c)
                     (or (invoke-error-exit-status c)
                         (invoke-error-stop-signal c)
                         (invoke-error-term-signal c)))
             (delete-file-recursively directory)
             #f))
    (with-directory-excursion directory
      (apply invoke svn-command
             "export" "--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))
                     '())
               ,@(if recursive?
                     '()
                     (list "--ignore-externals"))
               ,url ,directory))
      #t)))

;;; svn.scm ends here