gnu/packages.scm

   1 ;;; GNU Guix --- Functional package management for GNU
   2 ;;; Copyright © 2012, 2013, 2014, 2015, 2016 Ludovic Courtès <ludo@gnu.org>
   3 ;;; Copyright © 2013 Mark H Weaver <mhw@netris.org>
   4 ;;; Copyright © 2014 Eric Bavier <bavier@member.fsf.org>
   5 ;;; Copyright © 2016 Alex Kost <alezost@gmail.com>
   6 ;;; Copyright © 2016 Mathieu Lirzin <mthl@gnu.org>
   7 ;;;
   8 ;;; This file is part of GNU Guix.
   9 ;;;
  10 ;;; GNU Guix is free software; you can redistribute it and/or modify it
  11 ;;; under the terms of the GNU General Public License as published by
  12 ;;; the Free Software Foundation; either version 3 of the License, or (at
  13 ;;; your option) any later version.
  14 ;;;
  15 ;;; GNU Guix is distributed in the hope that it will be useful, but
  16 ;;; WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;;; GNU General Public License for more details.
  19 ;;;
  20 ;;; You should have received a copy of the GNU General Public License
  21 ;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
  22
  23 (define-module (gnu packages)
  24   #:use-module (guix packages)
  25   #:use-module (guix ui)
  26   #:use-module (guix utils)
  27   #:use-module (guix combinators)
  28   #:use-module ((guix build utils)
  29                 #:select ((package-name->name+version
  30                            . hyphen-separated-name->name+version)))
  31   #:use-module (ice-9 ftw)
  32   #:use-module (ice-9 vlist)
  33   #:use-module (ice-9 match)
  34   #:use-module (srfi srfi-1)
  35   #:use-module (srfi srfi-11)
  36   #:use-module (srfi srfi-26)
  37   #:use-module (srfi srfi-34)
  38   #:use-module (srfi srfi-35)
  39   #:use-module (srfi srfi-39)
  40   #:export (search-patch
  41             search-patches
  42             search-bootstrap-binary
  43             %patch-path
  44             %bootstrap-binaries-path
  45             %package-module-path
  46
  47             fold-packages
  48             scheme-modules                    ;XXX: for lack of a better place
  49
  50             find-packages-by-name
  51             find-best-packages-by-name
  52             find-newest-available-packages
  53
  54             specification->package
  55             specification->package+output))
  56
  57 ;;; Commentary:
  58 ;;;
  59 ;;; General utilities for the software distribution---i.e., the modules under
  60 ;;; (gnu packages ...).
  61 ;;;
  62 ;;; Code:
  63
  64 ;; By default, we store patches and bootstrap binaries alongside Guile
  65 ;; modules.  This is so that these extra files can be found without
  66 ;; requiring a special setup, such as a specific installation directory
  67 ;; and an extra environment variable.  One advantage of this setup is
  68 ;; that everything just works in an auto-compilation setting.
  69
  70 (define %bootstrap-binaries-path
  71   (make-parameter
  72    (map (cut string-append <> "/gnu/packages/bootstrap")
  73         %load-path)))
  74
  75 (define (search-patch file-name)
  76   "Search the patch FILE-NAME.  Raise an error if not found."
  77   (or (search-path (%patch-path) file-name)
  78       (raise (condition
  79               (&message (message (format #f (_ "~a: patch not found")
  80                                          file-name)))))))
  81
  82 (define-syntax-rule (search-patches file-name ...)
  83   "Return the list of absolute file names corresponding to each
  84 FILE-NAME found in %PATCH-PATH."
  85   (list (search-patch file-name) ...))
  86
  87 (define (search-bootstrap-binary file-name system)
  88   "Search the bootstrap binary FILE-NAME for SYSTEM.  Raise an error if not
  89 found."
  90   (or (search-path (%bootstrap-binaries-path)
  91                    (string-append system "/" file-name))
  92       (raise (condition
  93               (&message
  94                (message
  95                 (format #f (_ "could not find bootstrap binary '~a' \
  96 for system '~a'")
  97                         file-name system)))))))
  98
  99 (define %distro-root-directory
 100   ;; Absolute file name of the module hierarchy.
 101   (dirname (search-path %load-path "guix.scm")))
 102
 103 (define %package-module-path
 104   ;; Search path for package modules.  Each item must be either a directory
 105   ;; name or a pair whose car is a directory and whose cdr is a sub-directory
 106   ;; to narrow the search.
 107   (let* ((not-colon   (char-set-complement (char-set #\:)))
 108          (environment (string-tokenize (or (getenv "GUIX_PACKAGE_PATH") "")
 109                                        not-colon)))
 110     ;; Automatically add items from $GUIX_PACKAGE_PATH to Guile's search path.
 111     (for-each (lambda (directory)
 112                 (set! %load-path (cons directory %load-path))
 113                 (set! %load-compiled-path
 114                       (cons directory %load-compiled-path)))
 115               environment)
 116
 117     (make-parameter
 118      (append environment `((,%distro-root-directory . "gnu/packages"))))))
 119
 120 (define %patch-path
 121   ;; Define it after '%package-module-path' so that '%load-path' contains user
 122   ;; directories, allowing patches in $GUIX_PACKAGE_PATH to be found.
 123   (make-parameter
 124    (map (lambda (directory)
 125           (if (string=? directory %distro-root-directory)
 126               (string-append directory "/gnu/packages/patches")
 127               directory))
 128         %load-path)))
 129
 130 (define* (scheme-files directory)
 131   "Return the list of Scheme files found under DIRECTORY, recursively.  The
 132 returned list is sorted in alphabetical order."
 133
 134   ;; Sort entries so that 'fold-packages' works in a deterministic fashion
 135   ;; regardless of details of the underlying file system.
 136   (sort (file-system-fold (const #t)                   ; enter?
 137                           (lambda (path stat result)   ; leaf
 138                             (if (string-suffix? ".scm" path)
 139                                 (cons path result)
 140                                 result))
 141                           (lambda (path stat result)   ; down
 142                             result)
 143                           (lambda (path stat result)   ; up
 144                             result)
 145                           (const #f)                   ; skip
 146                           (lambda (path stat errno result)
 147                             (warning (_ "cannot access `~a': ~a~%")
 148                                      path (strerror errno))
 149                             result)
 150                           '()
 151                           directory
 152                           stat)
 153         string<?))
 154
 155 (define file-name->module-name
 156   (let ((not-slash (char-set-complement (char-set #\/))))
 157     (lambda (file)
 158       "Return the module name (a list of symbols) corresponding to FILE."
 159       (map string->symbol
 160            (string-tokenize (string-drop-right file 4) not-slash)))))
 161
 162 (define* (scheme-modules directory #:optional sub-directory)
 163   "Return the list of Scheme modules available under DIRECTORY.
 164 Optionally, narrow the search to SUB-DIRECTORY."
 165   (define prefix-len
 166     (string-length directory))
 167
 168   (filter-map (lambda (file)
 169                 (let* ((file   (substring file prefix-len))
 170                        (module (file-name->module-name file)))
 171                   (catch #t
 172                     (lambda ()
 173                       (resolve-interface module))
 174                     (lambda args
 175                       ;; Report the error, but keep going.
 176                       (warn-about-load-error module args)
 177                       #f))))
 178               (scheme-files (if sub-directory
 179                                 (string-append directory "/" sub-directory)
 180                                 directory))))
 181
 182 (define* (all-package-modules #:optional (path (%package-module-path)))
 183   "Return the list of package modules found in PATH, a list of directories to
 184 search."
 185   (fold-right (lambda (spec result)
 186                 (match spec
 187                   ((? string? directory)
 188                    (append (scheme-modules directory) result))
 189                   ((directory . sub-directory)
 190                    (append (scheme-modules directory sub-directory)
 191                            result))))
 192               '()
 193               path))
 194
 195 (define (fold-packages proc init)
 196   "Call (PROC PACKAGE RESULT) for each available package, using INIT as
 197 the initial value of RESULT.  It is guaranteed to never traverse the
 198 same package twice."
 199   (identity   ; discard second return value
 200    (fold2 (lambda (module result seen)
 201             (fold2 (lambda (var result seen)
 202                      (if (and (package? var)
 203                               (not (vhash-assq var seen))
 204                               (not (hidden-package? var)))
 205                          (values (proc var result)
 206                                  (vhash-consq var #t seen))
 207                          (values result seen)))
 208                    result
 209                    seen
 210                    (module-map (lambda (sym var)
 211                                  (false-if-exception (variable-ref var)))
 212                                module)))
 213           init
 214           vlist-null
 215           (all-package-modules))))
 216
 217 (define find-packages-by-name
 218   (let ((packages (delay
 219                     (fold-packages (lambda (p r)
 220                                      (vhash-cons (package-name p) p r))
 221                                    vlist-null)))
 222         (version>? (lambda (p1 p2)
 223                      (version>? (package-version p1) (package-version p2)))))
 224     (lambda* (name #:optional version)
 225       "Return the list of packages with the given NAME.  If VERSION is not #f,
 226 then only return packages whose version is prefixed by VERSION, sorted in
 227 decreasing version order."
 228       (let ((matching (sort (vhash-fold* cons '() name (force packages))
 229                             version>?)))
 230         (if version
 231             (filter (lambda (package)
 232                       (string-prefix? version (package-version package)))
 233                     matching)
 234             matching)))))
 235
 236 (define find-newest-available-packages
 237   (memoize
 238    (lambda ()
 239      "Return a vhash keyed by package names, and with
 240 associated values of the form
 241
 242   (newest-version newest-package ...)
 243
 244 where the preferred package is listed first."
 245
 246      ;; FIXME: Currently, the preferred package is whichever one
 247      ;; was found last by 'fold-packages'.  Find a better solution.
 248      (fold-packages (lambda (p r)
 249                       (let ((name    (package-name p))
 250                             (version (package-version p)))
 251                         (match (vhash-assoc name r)
 252                           ((_ newest-so-far . pkgs)
 253                            (case (version-compare version newest-so-far)
 254                              ((>) (vhash-cons name `(,version ,p) r))
 255                              ((=) (vhash-cons name `(,version ,p ,@pkgs) r))
 256                              ((<) r)))
 257                           (#f (vhash-cons name `(,version ,p) r)))))
 258                     vlist-null))))
 259
 260 (define (find-best-packages-by-name name version)
 261   "If version is #f, return the list of packages named NAME with the highest
 262 version numbers; otherwise, return the list of packages named NAME and at
 263 VERSION."
 264   (if version
 265       (find-packages-by-name name version)
 266       (match (vhash-assoc name (find-newest-available-packages))
 267         ((_ version pkgs ...) pkgs)
 268         (#f '()))))
 269
 270 \f
 271 (define %sigint-prompt
 272   ;; The prompt to jump to upon SIGINT.
 273   (make-prompt-tag "interruptible"))
 274
 275 (define (call-with-sigint-handler thunk handler)
 276   "Call THUNK and return its value.  Upon SIGINT, call HANDLER with the signal
 277 number in the context of the continuation of the call to this function, and
 278 return its return value."
 279   (call-with-prompt %sigint-prompt
 280                     (lambda ()
 281                       (sigaction SIGINT
 282                         (lambda (signum)
 283                           (sigaction SIGINT SIG_DFL)
 284                           (abort-to-prompt %sigint-prompt signum)))
 285                       (dynamic-wind
 286                         (const #t)
 287                         thunk
 288                         (cut sigaction SIGINT SIG_DFL)))
 289                     (lambda (k signum)
 290                       (handler signum))))
 291
 292 \f
 293 ;;;
 294 ;;; Package specification.
 295 ;;;
 296
 297 (define* (%find-package spec name version #:key fallback?)
 298   (match (find-best-packages-by-name name version)
 299     ((pkg . pkg*)
 300      (unless (null? pkg*)
 301        (warning (_ "ambiguous package specification `~a'~%") spec)
 302        (warning (_ "choosing ~a from ~a~%")
 303                 (package-full-name pkg)
 304                 (location->string (package-location pkg))))
 305      (when fallback?
 306        (warning (_ "deprecated NAME-VERSION syntax; \
 307 use NAME@VERSION instead~%")))
 308      pkg)
 309     (_
 310      (if version
 311          (leave (_ "~A: package not found for version ~a~%") name version)
 312          (if (not fallback?)
 313              ;; XXX: Fallback to the older specification style with an hyphen
 314              ;; between NAME and VERSION, for backward compatibility.
 315              (call-with-values
 316                  (lambda ()
 317                    (hyphen-separated-name->name+version name))
 318                (cut %find-package spec <> <> #:fallback? #t))
 319
 320              ;; The fallback case didn't find anything either, so bail out.
 321              (leave (_ "~A: unknown package~%") name))))))
 322
 323 (define (specification->package spec)
 324   "Return a package matching SPEC.  SPEC may be a package name, or a package
 325 name followed by an at-sign and a version number.  If the version number is not
 326 present, return the preferred newest version."
 327   (let-values (((name version) (package-name->name+version spec)))
 328     (%find-package spec name version)))
 329
 330 (define* (specification->package+output spec #:optional (output "out"))
 331   "Return the package and output specified by SPEC, or #f and #f; SPEC may
 332 optionally contain a version number and an output name, as in these examples:
 333
 334   guile
 335   guile@2.0.9
 336   guile:debug
 337   guile@2.0.9:debug
 338
 339 If SPEC does not specify a version number, return the preferred newest
 340 version; if SPEC does not specify an output, return OUTPUT."
 341   (let-values (((name version sub-drv)
 342                 (package-specification->name+version+output spec output)))
 343     (match (%find-package spec name version)
 344       (#f
 345        (values #f #f))
 346       (package
 347        (if (member sub-drv (package-outputs package))
 348            (values package sub-drv)
 349            (leave (_ "package `~a' lacks output `~a'~%")
 350                   (package-full-name package)
 351                   sub-drv))))))