334 lines
13 KiB
Scheme
334 lines
13 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2014 David Thompson <davet@gnu.org>
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;;; Copyright © 2015 Cyril Roelandt <tipecaml@gmail.com>
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;;; Copyright © 2015, 2016 Ludovic Courtès <ludo@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 (guix import pypi)
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#:use-module (ice-9 binary-ports)
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#:use-module (ice-9 match)
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#:use-module (ice-9 pretty-print)
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#:use-module (ice-9 regex)
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#:use-module ((ice-9 rdelim) #:select (read-line))
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#:use-module (srfi srfi-1)
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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 (rnrs bytevectors)
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#:use-module (json)
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#:use-module (web uri)
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#:use-module (guix ui)
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#:use-module (guix utils)
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#:use-module ((guix build utils)
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#:select ((package-name->name+version
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. hyphen-package-name->name+version)))
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#:use-module (guix import utils)
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#:use-module ((guix download) #:prefix download:)
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#:use-module (guix import json)
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#:use-module (guix packages)
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#:use-module (guix upstream)
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#:use-module ((guix licenses) #:prefix license:)
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#:use-module (guix build-system python)
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#:use-module (gnu packages python)
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#:export (guix-package->pypi-name
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pypi->guix-package
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%pypi-updater))
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(define (pypi-fetch name)
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"Return an alist representation of the PyPI metadata for the package NAME,
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or #f on failure."
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(json-fetch (string-append "https://pypi.python.org/pypi/"
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name "/json")))
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;; For packages found on PyPI that lack a source distribution.
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(define-condition-type &missing-source-error &error
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missing-source-error?
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(package missing-source-error-package))
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(define (latest-source-release pypi-package)
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"Return the latest source release for PYPI-PACKAGE."
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(let ((releases (assoc-ref* pypi-package "releases"
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(assoc-ref* pypi-package "info" "version"))))
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(or (find (lambda (release)
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(string=? "sdist" (assoc-ref release "packagetype")))
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releases)
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(raise (condition (&missing-source-error
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(package pypi-package)))))))
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(define (latest-wheel-release pypi-package)
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"Return the url of the wheel for the latest release of pypi-package,
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or #f if there isn't any."
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(let ((releases (assoc-ref* pypi-package "releases"
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(assoc-ref* pypi-package "info" "version"))))
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(or (find (lambda (release)
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(string=? "bdist_wheel" (assoc-ref release "packagetype")))
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releases)
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#f)))
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(define (python->package-name name)
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"Given the NAME of a package on PyPI, return a Guix-compliant name for the
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package."
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(if (string-prefix? "python-" name)
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(snake-case name)
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(string-append "python-" (snake-case name))))
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(define (guix-package->pypi-name package)
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"Given a Python PACKAGE built from pypi.python.org, return the name of the
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package on PyPI."
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(let ((source-url (and=> (package-source package) origin-uri)))
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(hyphen-package-name->name+version
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(basename (file-sans-extension source-url)))))
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(define (wheel-url->extracted-directory wheel-url)
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(match (string-split (basename wheel-url) #\-)
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((name version _ ...)
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(string-append name "-" version ".dist-info"))))
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(define (maybe-inputs package-inputs)
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"Given a list of PACKAGE-INPUTS, tries to generate the 'inputs' field of a
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package definition."
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(match package-inputs
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(()
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'())
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((package-inputs ...)
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`((propagated-inputs (,'quasiquote ,package-inputs))))))
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(define (guess-requirements source-url wheel-url tarball)
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"Given SOURCE-URL, WHEEL-URL and a TARBALL of the package, return a list of
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the required packages specified in the requirements.txt file. TARBALL will be
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extracted in the current directory, and will be deleted."
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(define (tarball-directory url)
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;; Given the URL of the package's tarball, return the name of the directory
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;; that will be created upon decompressing it. If the filetype is not
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;; supported, return #f.
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;; TODO: Support more archive formats.
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(let ((basename (substring url (+ 1 (string-rindex url #\/)))))
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(cond
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((string-suffix? ".tar.gz" basename)
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(string-drop-right basename 7))
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((string-suffix? ".tar.bz2" basename)
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(string-drop-right basename 8))
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(else
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(begin
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(warning (_ "Unsupported archive format: \
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cannot determine package dependencies"))
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#f)))))
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(define (clean-requirement s)
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;; Given a requirement LINE, as can be found in a Python requirements.txt
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;; file, remove everything other than the actual name of the required
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;; package, and return it.
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(string-take s
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(or (string-index s #\space)
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(string-length s))))
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(define (comment? line)
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;; Return #t if the given LINE is a comment, #f otherwise.
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(eq? (string-ref (string-trim line) 0) #\#))
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(define (read-requirements requirements-file)
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;; Given REQUIREMENTS-FILE, a Python requirements.txt file, return a list
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;; of name/variable pairs describing the requirements.
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(call-with-input-file requirements-file
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(lambda (port)
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(let loop ((result '()))
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(let ((line (read-line port)))
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(if (eof-object? line)
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result
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(cond
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((or (string-null? line) (comment? line))
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(loop result))
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(else
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(loop (cons (python->package-name (clean-requirement line))
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result))))))))))
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(define (read-wheel-metadata wheel-archive)
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;; Given WHEEL-ARCHIVE, a ZIP Python wheel archive, return the package's
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;; requirements.
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(let* ((dirname (wheel-url->extracted-directory wheel-url))
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(json-file (string-append dirname "/metadata.json")))
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(and (zero? (system* "unzip" "-q" wheel-archive json-file))
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(dynamic-wind
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(const #t)
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(lambda ()
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(call-with-input-file json-file
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(lambda (port)
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(let* ((metadata (json->scm port))
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(run_requires (hash-ref metadata "run_requires"))
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(requirements (if run_requires
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(hash-ref (list-ref run_requires 0)
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"requires")
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'())))
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(map (lambda (r)
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(python->package-name (clean-requirement r)))
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requirements)))))
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(lambda ()
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(delete-file json-file)
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(rmdir dirname))))))
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(define (guess-requirements-from-wheel)
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;; Return the package's requirements using the wheel, or #f if an error
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;; occurs.
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(call-with-temporary-output-file
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(lambda (temp port)
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(if wheel-url
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(and (url-fetch wheel-url temp)
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(read-wheel-metadata temp))
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#f))))
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(define (guess-requirements-from-source)
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;; Return the package's requirements by guessing them from the source.
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(let ((dirname (tarball-directory source-url)))
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(if (string? dirname)
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(let* ((req-file (string-append dirname "/requirements.txt"))
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(exit-code (system* "tar" "xf" tarball req-file)))
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;; TODO: support more formats.
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(if (zero? exit-code)
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(dynamic-wind
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(const #t)
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(lambda ()
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(read-requirements req-file))
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(lambda ()
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(delete-file req-file)
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(rmdir dirname)))
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(begin
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(warning (_ "'tar xf' failed with exit code ~a\n")
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exit-code)
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'())))
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'())))
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;; First, try to compute the requirements using the wheel, since that is the
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;; most reliable option. If a wheel is not provided for this package, try
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;; getting them by reading the "requirements.txt" file from the source. Note
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;; that "requirements.txt" is not mandatory, so this is likely to fail.
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(or (guess-requirements-from-wheel)
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(guess-requirements-from-source)))
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(define (compute-inputs source-url wheel-url tarball)
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"Given the SOURCE-URL of an already downloaded TARBALL, return a list of
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name/variable pairs describing the required inputs of this package."
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(sort
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(map (lambda (input)
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(list input (list 'unquote (string->symbol input))))
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(remove (cut string=? "python-argparse" <>)
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(guess-requirements source-url wheel-url tarball)))
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(lambda args
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(match args
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(((a _ ...) (b _ ...))
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(string-ci<? a b))))))
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(define (make-pypi-sexp name version source-url wheel-url home-page synopsis
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description license)
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"Return the `package' s-expression for a python package with the given NAME,
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VERSION, SOURCE-URL, HOME-PAGE, SYNOPSIS, DESCRIPTION, and LICENSE."
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(call-with-temporary-output-file
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(lambda (temp port)
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(and (url-fetch source-url temp)
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`(package
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(name ,(python->package-name name))
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(version ,version)
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(source (origin
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(method url-fetch)
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;; Sometimes 'pypi-uri' doesn't quite work due to mixed
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;; cases in NAME, for instance, as is the case with
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;; "uwsgi". In that case, fall back to a full URL.
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(uri ,(if (equal? (pypi-uri name version) source-url)
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`(pypi-uri ,name version)
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`(string-append
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,@(factorize-uri source-url version))))
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(sha256
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(base32
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,(guix-hash-url temp)))))
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(build-system python-build-system)
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,@(maybe-inputs (compute-inputs source-url wheel-url temp))
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(home-page ,home-page)
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(synopsis ,synopsis)
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(description ,description)
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(license ,(license->symbol license)))))))
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(define (pypi->guix-package package-name)
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"Fetch the metadata for PACKAGE-NAME from pypi.python.org, and return the
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`package' s-expression corresponding to that package, or #f on failure."
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(let ((package (pypi-fetch package-name)))
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(and package
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(guard (c ((missing-source-error? c)
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(let ((package (missing-source-error-package c)))
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(leave (_ "no source release for pypi package ~a ~a~%")
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(assoc-ref* package "info" "name")
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(assoc-ref* package "info" "version")))))
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(let ((name (assoc-ref* package "info" "name"))
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(version (assoc-ref* package "info" "version"))
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(release (assoc-ref (latest-source-release package) "url"))
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(wheel (assoc-ref (latest-wheel-release package) "url"))
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(synopsis (assoc-ref* package "info" "summary"))
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(description (assoc-ref* package "info" "summary"))
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(home-page (assoc-ref* package "info" "home_page"))
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(license (string->license (assoc-ref* package "info" "license"))))
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(make-pypi-sexp name version release wheel home-page synopsis
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description license))))))
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(define (string->license str)
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"Convert the string STR into a license object."
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(match str
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("GNU LGPL" license:lgpl2.0)
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("GPL" license:gpl3)
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((or "BSD" "BSD License") license:bsd-3)
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((or "MIT" "MIT license" "Expat license") license:expat)
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("Public domain" license:public-domain)
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((or "Apache License, Version 2.0" "Apache 2.0") license:asl2.0)
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(_ #f)))
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(define (pypi-package? package)
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"Return true if PACKAGE is a Python package from PyPI."
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(define (pypi-url? url)
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(or (string-prefix? "https://pypi.python.org/" url)
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(string-prefix? "https://pypi.io/packages" url)))
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(let ((source-url (and=> (package-source package) origin-uri))
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(fetch-method (and=> (package-source package) origin-method)))
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(and (eq? fetch-method download:url-fetch)
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(match source-url
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((? string?)
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(pypi-url? source-url))
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((source-url ...)
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(any pypi-url? source-url))))))
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(define (latest-release package)
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"Return an <upstream-source> for the latest release of PACKAGE."
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(guard (c ((missing-source-error? c) #f))
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(let* ((pypi-name (guix-package->pypi-name package))
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(metadata (pypi-fetch pypi-name))
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(version (assoc-ref* metadata "info" "version"))
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(url (assoc-ref (latest-source-release metadata) "url")))
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(upstream-source
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(package (package-name package))
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(version version)
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(urls (list url))))))
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(define %pypi-updater
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(upstream-updater
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(name 'pypi)
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(description "Updater for PyPI packages")
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(pred pypi-package?)
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(latest latest-release)))
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