336 lines
13 KiB
Scheme
336 lines
13 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2012, 2013, 2014, 2015 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2013 Mark H Weaver <mhw@netris.org>
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;;; Copyright © 2014 Eric Bavier <bavier@member.fsf.org>
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;;; Copyright © 2016 Alex Kost <alezost@gmail.com>
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;;; Copyright © 2016 Mathieu Lirzin <mthl@gnu.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (gnu packages)
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#:use-module (guix packages)
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#:use-module (guix ui)
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#:use-module (guix utils)
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#:use-module (ice-9 ftw)
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#:use-module (ice-9 vlist)
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#:use-module (ice-9 match)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-11)
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#:use-module (srfi srfi-26)
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#:use-module (srfi srfi-34)
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#:use-module (srfi srfi-35)
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#:use-module (srfi srfi-39)
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#:export (search-patch
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search-bootstrap-binary
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%patch-path
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%bootstrap-binaries-path
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%package-module-path
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fold-packages
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find-packages-by-name
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find-best-packages-by-name
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find-newest-available-packages
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specification->package
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specification->package+output))
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;;; Commentary:
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;;;
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;;; General utilities for the software distribution---i.e., the modules under
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;;; (gnu packages ...).
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;;;
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;;; Code:
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;; By default, we store patches and bootstrap binaries alongside Guile
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;; modules. This is so that these extra files can be found without
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;; requiring a special setup, such as a specific installation directory
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;; and an extra environment variable. One advantage of this setup is
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;; that everything just works in an auto-compilation setting.
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(define %bootstrap-binaries-path
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(make-parameter
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(map (cut string-append <> "/gnu/packages/bootstrap")
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%load-path)))
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(define (search-patch file-name)
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"Search the patch FILE-NAME. Raise an error if not found."
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(or (search-path (%patch-path) file-name)
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(raise (condition
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(&message (message (format #f (_ "~a: patch not found")
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file-name)))))))
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(define (search-bootstrap-binary file-name system)
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"Search the bootstrap binary FILE-NAME for SYSTEM. Raise an error if not
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found."
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(or (search-path (%bootstrap-binaries-path)
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(string-append system "/" file-name))
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(raise (condition
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(&message
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(message
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(format #f (_ "could not find bootstrap binary '~a' \
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for system '~a'")
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file-name system)))))))
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(define %distro-root-directory
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;; Absolute file name of the module hierarchy.
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(dirname (search-path %load-path "guix.scm")))
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(define %package-module-path
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;; Search path for package modules. Each item must be either a directory
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;; name or a pair whose car is a directory and whose cdr is a sub-directory
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;; to narrow the search.
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(let* ((not-colon (char-set-complement (char-set #\:)))
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(environment (string-tokenize (or (getenv "GUIX_PACKAGE_PATH") "")
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not-colon)))
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;; Automatically add items from $GUIX_PACKAGE_PATH to Guile's search path.
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(for-each (lambda (directory)
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(set! %load-path (cons directory %load-path))
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(set! %load-compiled-path
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(cons directory %load-compiled-path)))
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environment)
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(make-parameter
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(append environment `((,%distro-root-directory . "gnu/packages"))))))
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(define %patch-path
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;; Define it after '%package-module-path' so that '%load-path' contains user
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;; directories, allowing patches in $GUIX_PACKAGE_PATH to be found.
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(make-parameter
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(map (lambda (directory)
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(if (string=? directory %distro-root-directory)
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(string-append directory "/gnu/packages/patches")
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directory))
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%load-path)))
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(define* (scheme-files directory)
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"Return the list of Scheme files found under DIRECTORY, recursively. The
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returned list is sorted in alphabetical order."
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;; Sort entries so that 'fold-packages' works in a deterministic fashion
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;; regardless of details of the underlying file system.
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(sort (file-system-fold (const #t) ; enter?
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(lambda (path stat result) ; leaf
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(if (string-suffix? ".scm" path)
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(cons path result)
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result))
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(lambda (path stat result) ; down
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result)
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(lambda (path stat result) ; up
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result)
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(const #f) ; skip
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(lambda (path stat errno result)
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(warning (_ "cannot access `~a': ~a~%")
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path (strerror errno))
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result)
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'()
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directory
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stat)
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string<?))
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(define file-name->module-name
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(let ((not-slash (char-set-complement (char-set #\/))))
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(lambda (file)
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"Return the module name (a list of symbols) corresponding to FILE."
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(map string->symbol
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(string-tokenize (string-drop-right file 4) not-slash)))))
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(define* (package-modules directory #:optional sub-directory)
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"Return the list of modules that provide packages for the distribution.
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Optionally, narrow the search to SUB-DIRECTORY."
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(define prefix-len
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(string-length directory))
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(filter-map (lambda (file)
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(let* ((file (substring file prefix-len))
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(module (file-name->module-name file)))
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(catch #t
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(lambda ()
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(resolve-interface module))
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(lambda args
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;; Report the error, but keep going.
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(warn-about-load-error module args)
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#f))))
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(scheme-files (if sub-directory
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(string-append directory "/" sub-directory)
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directory))))
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(define* (all-package-modules #:optional (path (%package-module-path)))
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"Return the list of package modules found in PATH, a list of directories to
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search."
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(fold-right (lambda (spec result)
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(match spec
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((? string? directory)
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(append (package-modules directory) result))
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((directory . sub-directory)
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(append (package-modules directory sub-directory)
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result))))
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'()
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path))
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(define (fold-packages proc init)
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"Call (PROC PACKAGE RESULT) for each available package, using INIT as
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the initial value of RESULT. It is guaranteed to never traverse the
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same package twice."
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(identity ; discard second return value
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(fold2 (lambda (module result seen)
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(fold2 (lambda (var result seen)
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(if (and (package? var)
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(not (vhash-assq var seen)))
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(values (proc var result)
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(vhash-consq var #t seen))
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(values result seen)))
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result
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seen
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(module-map (lambda (sym var)
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(false-if-exception (variable-ref var)))
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module)))
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init
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vlist-null
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(all-package-modules))))
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(define find-packages-by-name
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(let ((packages (delay
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(fold-packages (lambda (p r)
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(vhash-cons (package-name p) p r))
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vlist-null)))
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(version>? (lambda (p1 p2)
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(version>? (package-version p1) (package-version p2)))))
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(lambda* (name #:optional version)
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"Return the list of packages with the given NAME. If VERSION is not #f,
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then only return packages whose version is prefixed by VERSION, sorted in
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decreasing version order."
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(let ((matching (sort (vhash-fold* cons '() name (force packages))
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version>?)))
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(if version
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(filter (lambda (package)
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(string-prefix? version (package-version package)))
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matching)
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matching)))))
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(define find-newest-available-packages
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(memoize
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(lambda ()
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"Return a vhash keyed by package names, and with
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associated values of the form
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(newest-version newest-package ...)
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where the preferred package is listed first."
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;; FIXME: Currently, the preferred package is whichever one
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;; was found last by 'fold-packages'. Find a better solution.
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(fold-packages (lambda (p r)
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(let ((name (package-name p))
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(version (package-version p)))
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(match (vhash-assoc name r)
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((_ newest-so-far . pkgs)
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(case (version-compare version newest-so-far)
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((>) (vhash-cons name `(,version ,p) r))
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((=) (vhash-cons name `(,version ,p ,@pkgs) r))
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((<) r)))
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(#f (vhash-cons name `(,version ,p) r)))))
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vlist-null))))
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(define (find-best-packages-by-name name version)
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"If version is #f, return the list of packages named NAME with the highest
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version numbers; otherwise, return the list of packages named NAME and at
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VERSION."
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(if version
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(find-packages-by-name name version)
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(match (vhash-assoc name (find-newest-available-packages))
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((_ version pkgs ...) pkgs)
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(#f '()))))
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(define %sigint-prompt
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;; The prompt to jump to upon SIGINT.
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(make-prompt-tag "interruptible"))
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(define (call-with-sigint-handler thunk handler)
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"Call THUNK and return its value. Upon SIGINT, call HANDLER with the signal
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number in the context of the continuation of the call to this function, and
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return its return value."
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(call-with-prompt %sigint-prompt
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(lambda ()
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(sigaction SIGINT
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(lambda (signum)
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(sigaction SIGINT SIG_DFL)
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(abort-to-prompt %sigint-prompt signum)))
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(dynamic-wind
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(const #t)
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thunk
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(cut sigaction SIGINT SIG_DFL)))
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(lambda (k signum)
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(handler signum))))
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;;;
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;;; Package specification.
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;;;
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(define* (%find-package spec name version #:key fallback?)
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(match (find-best-packages-by-name name version)
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((pkg . pkg*)
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(unless (null? pkg*)
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(warning (_ "ambiguous package specification `~a'~%") spec)
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(warning (_ "choosing ~a from ~a~%")
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(package-full-name pkg)
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(location->string (package-location pkg))))
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(when fallback?
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(warning (_ "deprecated NAME-VERSION syntax.~%")))
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pkg)
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(_
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(if version
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(leave (_ "~A: package not found for version ~a~%") name version)
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(or fallback?
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;; XXX: Fallback to the older specification style with an hyphen
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;; between NAME and VERSION, for backward compatibility.
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(let ((proc (@ (guix build utils) package-name->name+version)))
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(call-with-values (proc name)
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(cut %find-package spec <> <> #:fallback? #t)))
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(leave (_ "~A: unknown package~%") name))))))
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(define (specification->package spec)
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"Return a package matching SPEC. SPEC may be a package name, or a package
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name followed by an at-sign and a version number. If the version number is not
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present, return the preferred newest version."
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(let-values (((name version) (package-name->name+version spec)))
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(%find-package spec name version)))
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(define* (specification->package+output spec #:optional (output "out"))
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"Return the package and output specified by SPEC, or #f and #f; SPEC may
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optionally contain a version number and an output name, as in these examples:
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guile
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guile@2.0.9
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guile:debug
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guile@2.0.9:debug
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If SPEC does not specify a version number, return the preferred newest
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version; if SPEC does not specify an output, return OUTPUT."
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(let-values (((name version sub-drv)
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(package-specification->name+version+output spec output)))
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(match (%find-package spec name version)
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(#f
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(values #f #f))
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(package
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(if (member sub-drv (package-outputs package))
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(values package sub-drv)
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(leave (_ "package `~a' lacks output `~a'~%")
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(package-full-name package)
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sub-drv))))))
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