guix/hg-download.scm

   1 ;;; GNU Guix --- Functional package management for GNU
   2 ;;; Copyright © 2014, 2015, 2016, 2017, 2019 Ludovic Courtès <ludo@gnu.org>
   3 ;;; Copyright © 2016 Ricardo Wurmus <rekado@elephly.net>
   4 ;;;
   5 ;;; This file is part of GNU Guix.
   6 ;;;
   7 ;;; GNU Guix is free software; you can redistribute it and/or modify it
   8 ;;; under the terms of the GNU General Public License as published by
   9 ;;; the Free Software Foundation; either version 3 of the License, or (at
  10 ;;; your option) any later version.
  11 ;;;
  12 ;;; GNU Guix is distributed in the hope that it will be useful, but
  13 ;;; WITHOUT ANY WARRANTY; without even the implied warranty of
  14 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 ;;; GNU General Public License for more details.
  16 ;;;
  17 ;;; You should have received a copy of the GNU General Public License
  18 ;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
  19
  20 (define-module (guix hg-download)
  21   #:use-module (guix gexp)
  22   #:use-module (guix store)
  23   #:use-module (guix monads)
  24   #:use-module (guix records)
  25   #:use-module (guix modules)
  26   #:use-module (guix packages)
  27   #:autoload   (guix build-system gnu) (standard-packages)
  28   #:use-module (ice-9 match)
  29   #:export (hg-reference
  30             hg-reference?
  31             hg-reference-url
  32             hg-reference-changeset
  33             hg-reference-recursive?
  34
  35             hg-fetch))
  36
  37 ;;; Commentary:
  38 ;;;
  39 ;;; An <origin> method that fetches a specific changeset from a Mercurial
  40 ;;; repository.  The repository URL and changeset ID are specified with a
  41 ;;; <hg-reference> object.
  42 ;;;
  43 ;;; Code:
  44
  45 (define-record-type* <hg-reference>
  46   hg-reference make-hg-reference
  47   hg-reference?
  48   (url        hg-reference-url)
  49   (changeset  hg-reference-changeset))
  50
  51 (define (hg-package)
  52   "Return the default Mercurial package."
  53   (let ((distro (resolve-interface '(gnu packages version-control))))
  54     (module-ref distro 'mercurial)))
  55
  56 (define* (hg-fetch ref hash-algo hash
  57                    #:optional name
  58                    #:key (system (%current-system)) (guile (default-guile))
  59                    (hg (hg-package)))
  60   "Return a fixed-output derivation that fetches REF, a <hg-reference>
  61 object.  The output is expected to have recursive hash HASH of type
  62 HASH-ALGO (a symbol).  Use NAME as the file name, or a generic name if #f."
  63   (define guile-zlib
  64     (module-ref (resolve-interface '(gnu packages guile)) 'guile-zlib))
  65
  66   (define modules
  67     (delete '(guix config)
  68             (source-module-closure '((guix build hg)
  69                                      (guix build download-nar)))))
  70
  71   (define build
  72     (with-imported-modules modules
  73       (with-extensions (list guile-zlib)
  74         #~(begin
  75             (use-modules (guix build hg)
  76                          (guix build download-nar))
  77
  78             (or (hg-fetch '#$(hg-reference-url ref)
  79                           '#$(hg-reference-changeset ref)
  80                           #$output
  81                           #:hg-command (string-append #+hg "/bin/hg"))
  82                 (download-nar #$output))))))
  83
  84   (mlet %store-monad ((guile (package->derivation guile system)))
  85     (gexp->derivation (or name "hg-checkout") build
  86                       #:leaked-env-vars '("http_proxy" "https_proxy"
  87                                           "LC_ALL" "LC_MESSAGES" "LANG"
  88                                           "COLUMNS")
  89                       #:system system
  90                       #:local-build? #t           ;don't offload repo cloning
  91                       #:hash-algo hash-algo
  92                       #:hash hash
  93                       #:recursive? #t
  94                       #:guile-for-build guile)))
  95
  96 ;;; hg-download.scm ends here