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guix/gnu/packages.scm

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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2012, 2013 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2013 Mark H Weaver <mhw@netris.org>
;;; Copyright © 2014 Eric Bavier <bavier@member.fsf.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 (gnu packages)
#:use-module (guix packages)
#:use-module (guix ui)
#:use-module (guix utils)
#:use-module (ice-9 ftw)
#:use-module (ice-9 vlist)
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#:use-module (srfi srfi-39)
#:export (search-patch
search-bootstrap-binary
%patch-directory
%bootstrap-binaries-path
fold-packages
find-packages-by-name
find-best-packages-by-name
find-newest-available-packages
package-direct-dependents
package-transitive-dependents
package-covering-dependents))
;;; Commentary:
;;;
;;; General utilities for the software distribution---i.e., the modules under
;;; (gnu packages ...).
;;;
;;; Code:
(define _ (cut gettext <> "guix"))
;; By default, we store patches and bootstrap binaries alongside Guile
;; modules. This is so that these extra files can be found without
;; requiring a special setup, such as a specific installation directory
;; and an extra environment variable. One advantage of this setup is
;; that everything just works in an auto-compilation setting.
(define %patch-path
(make-parameter
(map (cut string-append <> "/gnu/packages/patches")
%load-path)))
(define %bootstrap-binaries-path
(make-parameter
(map (cut string-append <> "/gnu/packages/bootstrap")
%load-path)))
(define (search-patch file-name)
"Search the patch FILE-NAME."
(search-path (%patch-path) file-name))
(define (search-bootstrap-binary file-name system)
"Search the bootstrap binary FILE-NAME for SYSTEM."
(search-path (%bootstrap-binaries-path)
(string-append system "/" file-name)))
(define %distro-module-directory
;; Absolute path of the (gnu packages ...) module root.
(string-append (dirname (search-path %load-path "gnu/packages.scm"))
"/packages"))
(define (package-files)
"Return the list of files that implement distro modules."
(define prefix-len
(string-length
(dirname (dirname (search-path %load-path "gnu/packages.scm")))))
(file-system-fold (const #t) ; enter?
(lambda (path stat result) ; leaf
(if (string-suffix? ".scm" path)
(cons (substring path prefix-len) result)
result))
(lambda (path stat result) ; down
result)
(lambda (path stat result) ; up
result)
(const #f) ; skip
(lambda (path stat errno result)
(warning (_ "cannot access `~a': ~a~%")
path (strerror errno))
result)
'()
%distro-module-directory
stat))
(define (package-modules)
"Return the list of modules that provide packages for the distribution."
(define not-slash
(char-set-complement (char-set #\/)))
(filter-map (lambda (path)
(let ((name (map string->symbol
(string-tokenize (string-drop-right path 4)
not-slash))))
(false-if-exception (resolve-interface name))))
(package-files)))
(define (fold-packages proc init)
"Call (PROC PACKAGE RESULT) for each available package, using INIT as
the initial value of RESULT. It is guaranteed to never traverse the
same package twice."
(identity ; discard second return value
(fold2 (lambda (module result seen)
(fold2 (lambda (var result seen)
(if (and (package? var)
(not (vhash-assq var seen)))
(values (proc var result)
(vhash-consq var #t seen))
(values result seen)))
result
seen
(module-map (lambda (sym var)
(false-if-exception (variable-ref var)))
module)))
init
vlist-null
(package-modules))))
(define* (find-packages-by-name name #:optional version)
"Return the list of packages with the given NAME. If VERSION is not #f,
then only return packages whose version is equal to VERSION."
(define right-package?
(if version
(lambda (p)
(and (string=? (package-name p) name)
(string=? (package-version p) version)))
(lambda (p)
(string=? (package-name p) name))))
(fold-packages (lambda (package result)
(if (right-package? package)
(cons package result)
result))
'()))
(define find-newest-available-packages
(memoize
(lambda ()
"Return a vhash keyed by package names, and with
associated values of the form
(newest-version newest-package ...)
where the preferred package is listed first."
;; FIXME: Currently, the preferred package is whichever one
;; was found last by 'fold-packages'. Find a better solution.
(fold-packages (lambda (p r)
(let ((name (package-name p))
(version (package-version p)))
(match (vhash-assoc name r)
((_ newest-so-far . pkgs)
(case (version-compare version newest-so-far)
((>) (vhash-cons name `(,version ,p) r))
((=) (vhash-cons name `(,version ,p ,@pkgs) r))
((<) r)))
(#f (vhash-cons name `(,version ,p) r)))))
vlist-null))))
(define (find-best-packages-by-name name version)
"If version is #f, return the list of packages named NAME with the highest
version numbers; otherwise, return the list of packages named NAME and at
VERSION."
(if version
(find-packages-by-name name version)
(match (vhash-assoc name (find-newest-available-packages))
((_ version pkgs ...) pkgs)
(#f '()))))
(define* (vhash-refq vhash key #:optional (dflt #f))
"Look up KEY in the vhash VHASH, and return the value (if any) associated
with it. If KEY is not found, return DFLT (or `#f' if no DFLT argument is
supplied). Uses `eq?' for equality testing."
(or (and=> (vhash-assq key vhash) cdr)
dflt))
(define package-dependencies
(memoize
(lambda ()
"Return a vhash keyed by package, and with associated values that are a
list of packages that depend on that package."
(fold-packages
(lambda (package dag)
(fold
(lambda (in d)
;; Insert a graph edge from each of package's inputs to package.
(vhash-consq in
(cons package (vhash-refq d in '()))
(vhash-delq in d)))
dag
(match (package-direct-inputs package)
(((labels packages . _) ...)
packages) )))
vlist-null))))
(define (package-direct-dependents packages)
"Return a list of packages from the distribution that directly depend on the
packages in PACKAGES."
(delete-duplicates
(concatenate
(map (lambda (p)
(vhash-refq (package-dependencies) p '()))
packages))))
(define (package-transitive-dependents packages)
"Return the transitive dependent packages of the distribution packages in
PACKAGES---i.e. the dependents of those packages, plus their dependents,
recursively."
(let ((dependency-dag (package-dependencies)))
(fold-tree
cons '()
(lambda (node) (vhash-refq dependency-dag node))
;; Start with the dependents to avoid including PACKAGES in the result.
(package-direct-dependents packages))))
(define (package-covering-dependents packages)
"Return a minimal list of packages from the distribution whose dependencies
include all of PACKAGES and all packages that depend on PACKAGES."
(let ((dependency-dag (package-dependencies)))
(fold-tree-leaves
cons '()
(lambda (node) (vhash-refq dependency-dag node))
;; Start with the dependents to avoid including PACKAGES in the result.
(package-direct-dependents packages))))
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