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guix/guix/import/pypi.scm

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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014 David Thompson <davet@gnu.org>
;;; Copyright © 2015 Cyril Roelandt <tipecaml@gmail.com>
;;; Copyright © 2015, 2016, 2017, 2019, 2020 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
;;; Copyright © 2018 Ricardo Wurmus <rekado@elephly.net>
;;; Copyright © 2019 Maxim Cournoyer <maxim.cournoyer@gmail.com>
;;; Copyright © 2020 Jakub Kądziołka <kuba@kadziolka.net>
;;; Copyright © 2020 Lars-Dominik Braun <ldb@leibniz-psychology.org>
;;; Copyright © 2020 Arun Isaac <arunisaac@systemreboot.net>
;;; Copyright © 2020 Martin Becze <mjbecze@riseup.net>
;;;
;;; 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 (guix import pypi)
#:use-module (ice-9 match)
#:use-module (ice-9 regex)
#:use-module (ice-9 receive)
#:use-module ((ice-9 rdelim) #:select (read-line))
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-11)
#:use-module (srfi srfi-26)
#:use-module (srfi srfi-34)
#:use-module (srfi srfi-35)
#:use-module (guix utils)
#:use-module (guix memoization)
#:use-module (guix diagnostics)
#:use-module (guix i18n)
#:use-module ((guix build utils)
#:select ((package-name->name+version
. hyphen-package-name->name+version)
find-files
invoke))
#:use-module (guix import utils)
#:use-module ((guix download) #:prefix download:)
#:use-module (guix import json)
#:use-module (json)
#:use-module (guix packages)
#:use-module (guix upstream)
#:use-module ((guix licenses) #:prefix license:)
#:use-module (guix build-system python)
#:export (parse-requires.txt
parse-wheel-metadata
specification->requirement-name
guix-package->pypi-name
pypi-recursive-import
pypi->guix-package
%pypi-updater))
;; The PyPI API (notice the rhyme) is "documented" at:
;; <https://warehouse.readthedocs.io/api-reference/json/>.
(define non-empty-string-or-false
(match-lambda
("" #f)
((? string? str) str)
((or 'null #f) #f)))
;; PyPI project.
(define-json-mapping <pypi-project> make-pypi-project pypi-project?
json->pypi-project
(info pypi-project-info "info" json->project-info) ;<project-info>
(last-serial pypi-project-last-serial "last_serial") ;integer
(releases pypi-project-releases "releases" ;string/<distribution>* pairs
(match-lambda
(((versions . dictionaries) ...)
(map (lambda (version vector)
(cons version
(map json->distribution
(vector->list vector))))
versions dictionaries))))
(distributions pypi-project-distributions "urls" ;<distribution>*
(lambda (vector)
(map json->distribution (vector->list vector)))))
;; Project metadata.
(define-json-mapping <project-info> make-project-info project-info?
json->project-info
(name project-info-name) ;string
(author project-info-author) ;string
(maintainer project-info-maintainer) ;string
(classifiers project-info-classifiers ;list of strings
"classifiers" vector->list)
(description project-info-description) ;string
(summary project-info-summary) ;string
(keywords project-info-keywords) ;string
(license project-info-license) ;string
(download-url project-info-download-url ;string | #f
"download_url" non-empty-string-or-false)
(home-page project-info-home-page ;string
"home_page")
(url project-info-url "project_url") ;string
(release-url project-info-release-url "release_url") ;string
(version project-info-version)) ;string
;; Distribution: a URL along with cryptographic hashes and metadata.
(define-json-mapping <distribution> make-distribution distribution?
json->distribution
(url distribution-url) ;string
(digests distribution-digests) ;list of string pairs
(file-name distribution-file-name "filename") ;string
(has-signature? distribution-has-signature? "hash_sig") ;Boolean
(package-type distribution-package-type "packagetype") ;"bdist_wheel" | ...
(python-version distribution-package-python-version
"python_version"))
(define (pypi-fetch name)
"Return a <pypi-project> record for package NAME, or #f on failure."
(and=> (json-fetch (string-append "https://pypi.org/pypi/" name "/json"))
json->pypi-project))
;; For packages found on PyPI that lack a source distribution.
(define-condition-type &missing-source-error &error
missing-source-error?
(package missing-source-error-package))
(define (latest-source-release pypi-package)
"Return the latest source release for PYPI-PACKAGE."
(let ((releases (assoc-ref (pypi-project-releases pypi-package)
(project-info-version
(pypi-project-info pypi-package)))))
(or (find (lambda (release)
(string=? "sdist" (distribution-package-type release)))
releases)
(raise (condition (&missing-source-error
(package pypi-package)))))))
(define (latest-wheel-release pypi-package)
"Return the url of the wheel for the latest release of pypi-package,
or #f if there isn't any."
(let ((releases (assoc-ref (pypi-project-releases pypi-package)
(project-info-version
(pypi-project-info pypi-package)))))
(or (find (lambda (release)
(string=? "bdist_wheel" (distribution-package-type release)))
releases)
#f)))
(define (python->package-name name)
"Given the NAME of a package on PyPI, return a Guix-compliant name for the
package."
(if (string-prefix? "python-" name)
(snake-case name)
(string-append "python-" (snake-case name))))
(define (guix-package->pypi-name package)
"Given a Python PACKAGE built from pypi.org, return the name of the
package on PyPI."
(define (url->pypi-name url)
(hyphen-package-name->name+version
(basename (file-sans-extension url))))
(match (and=> (package-source package) origin-uri)
((? string? url)
(url->pypi-name url))
((lst ...)
(any url->pypi-name lst))
(#f #f)))
(define (wheel-url->extracted-directory wheel-url)
(match (string-split (basename wheel-url) #\-)
((name version _ ...)
(string-append name "-" version ".dist-info"))))
(define (maybe-inputs package-inputs input-type)
"Given a list of PACKAGE-INPUTS, tries to generate the 'inputs' field of a
package definition. INPUT-TYPE, a symbol, is used to populate the name of
the input field."
(match package-inputs
(()
'())
((package-inputs ...)
`((,input-type (,'quasiquote ,package-inputs))))))
(define %requirement-name-regexp
;; Regexp to match the requirement name in a requirement specification.
;; Some grammar, taken from PEP-0508 (see:
;; https://www.python.org/dev/peps/pep-0508/).
;; Using this grammar makes the PEP-0508 regexp easier to understand for
;; humans. The use of a regexp is preferred to more primitive string
;; manipulations because we can more directly match what upstream uses
;; (again, per PEP-0508). The regexp approach is also easier to extend,
;; should we want to implement more completely the grammar of PEP-0508.
;; The unified rule can be expressed as:
;; specification = wsp* ( url_req | name_req ) wsp*
;; where url_req is:
;; url_req = name wsp* extras? wsp* urlspec wsp+ quoted_marker?
;; and where name_req is:
;; name_req = name wsp* extras? wsp* versionspec? wsp* quoted_marker?
;; Thus, we need only matching NAME, which is expressed as:
;; identifer_end = letterOrDigit | (('-' | '_' | '.' )* letterOrDigit)
;; identifier = letterOrDigit identifier_end*
;; name = identifier
(let* ((letter-or-digit "[A-Za-z0-9]")
(identifier-end (string-append "(" letter-or-digit "|"
"[-_.]*" letter-or-digit ")"))
(identifier (string-append "^" letter-or-digit identifier-end "*"))
(name identifier))
(make-regexp name)))
(define (specification->requirement-name spec)
"Given a specification SPEC, return the requirement name."
(match:substring
(or (regexp-exec %requirement-name-regexp spec)
(error (G_ "Could not extract requirement name in spec:") spec))))
(define (test-section? name)
"Return #t if the section name contains 'test' or 'dev'."
(any (cut string-contains-ci name <>)
'("test" "dev")))
(define (parse-requires.txt requires.txt)
"Given REQUIRES.TXT, a Setuptools requires.txt file, return a list of lists
of requirements.
The first list contains the required dependencies while the second the
optional test dependencies. Note that currently, optional, non-test
dependencies are omitted since these can be difficult or expensive to
satisfy."
(define (comment? line)
;; Return #t if the given LINE is a comment, #f otherwise.
(string-prefix? "#" (string-trim line)))
(define (section-header? line)
;; Return #t if the given LINE is a section header, #f otherwise.
(string-prefix? "[" (string-trim line)))
(call-with-input-file requires.txt
(lambda (port)
(let loop ((required-deps '())
(test-deps '())
(inside-test-section? #f)
(optional? #f))
(let ((line (read-line port)))
(cond
((eof-object? line)
;; Duplicates can occur, since the same requirement can be
;; listed multiple times with different conditional markers, e.g.
;; pytest >= 3 ; python_version >= "3.3"
;; pytest < 3 ; python_version < "3.3"
(map (compose reverse delete-duplicates)
(list required-deps test-deps)))
((or (string-null? line) (comment? line))
(loop required-deps test-deps inside-test-section? optional?))
((section-header? line)
;; Encountering a section means that all the requirements
;; listed below are optional. Since we want to pick only the
;; test dependencies from the optional dependencies, we must
;; track those separately.
(loop required-deps test-deps (test-section? line) #t))
(inside-test-section?
(loop required-deps
(cons (specification->requirement-name line)
test-deps)
inside-test-section? optional?))
((not optional?)
(loop (cons (specification->requirement-name line)
required-deps)
test-deps inside-test-section? optional?))
(optional?
;; Skip optional items.
(loop required-deps test-deps inside-test-section? optional?))
(else
(warning (G_ "parse-requires.txt reached an unexpected \
condition on line ~a~%") line))))))))
(define (parse-wheel-metadata metadata)
"Given METADATA, a Wheel metadata file, return a list of lists of
requirements.
Refer to the documentation of PARSE-REQUIRES.TXT for a description of the
returned value."
;; METADATA is a RFC-2822-like, header based file.
(define (requires-dist-header? line)
;; Return #t if the given LINE is a Requires-Dist header.
(string-match "^Requires-Dist: " line))
(define (requires-dist-value line)
(string-drop line (string-length "Requires-Dist: ")))
(define (extra? line)
;; Return #t if the given LINE is an "extra" requirement.
(string-match "extra == '(.*)'" line))
(define (test-requirement? line)
(and=> (match:substring (extra? line) 1) test-section?))
(call-with-input-file metadata
(lambda (port)
(let loop ((required-deps '())
(test-deps '()))
(let ((line (read-line port)))
(cond
((eof-object? line)
(map (compose reverse delete-duplicates)
(list required-deps test-deps)))
((and (requires-dist-header? line) (not (extra? line)))
(loop (cons (specification->requirement-name
(requires-dist-value line))
required-deps)
test-deps))
((and (requires-dist-header? line) (test-requirement? line))
(loop required-deps
(cons (specification->requirement-name (requires-dist-value line))
test-deps)))
(else
(loop required-deps test-deps)))))))) ;skip line
(define (guess-requirements source-url wheel-url archive)
"Given SOURCE-URL, WHEEL-URL and an ARCHIVE of the package, return a list
of the required packages specified in the requirements.txt file. ARCHIVE will
be extracted in a temporary directory."
(define (read-wheel-metadata wheel-archive)
;; Given WHEEL-ARCHIVE, a ZIP Python wheel archive, return the package's
;; requirements, or #f if the metadata file contained therein couldn't be
;; extracted.
(let* ((dirname (wheel-url->extracted-directory wheel-url))
(metadata (string-append dirname "/METADATA")))
(call-with-temporary-directory
(lambda (dir)
(if (zero?
(parameterize ((current-error-port (%make-void-port "rw+"))
(current-output-port (%make-void-port "rw+")))
(system* "unzip" wheel-archive "-d" dir metadata)))
(parse-wheel-metadata (string-append dir "/" metadata))
(begin
(warning
(G_ "Failed to extract file: ~a from wheel.~%") metadata)
#f))))))
(define (guess-requirements-from-wheel)
;; Return the package's requirements using the wheel, or #f if an error
;; occurs.
(call-with-temporary-output-file
(lambda (temp port)
(if wheel-url
(and (url-fetch wheel-url temp)
(read-wheel-metadata temp))
#f))))
(define (guess-requirements-from-source)
;; Return the package's requirements by guessing them from the source.
(if (compressed-file? source-url)
(call-with-temporary-directory
(lambda (dir)
(parameterize ((current-error-port (%make-void-port "rw+"))
(current-output-port (%make-void-port "rw+")))
(if (string=? "zip" (file-extension source-url))
(invoke "unzip" archive "-d" dir)
(invoke "tar" "xf" archive "-C" dir)))
(let ((requires.txt-files
(find-files dir (lambda (abs-file-name _)
(string-match "\\.egg-info/requires.txt$"
abs-file-name)))))
(match requires.txt-files
(()
(warning (G_ "Cannot guess requirements from source archive:\
no requires.txt file found.~%"))
(list '() '()))
(else (parse-requires.txt (first requires.txt-files)))))))
(begin
(warning (G_ "Unsupported archive format; \
cannot determine package dependencies from source archive: ~a~%")
(basename source-url))
(list '() '()))))
;; First, try to compute the requirements using the wheel, else, fallback to
;; reading the "requires.txt" from the egg-info directory from the source
;; archive.
(or (guess-requirements-from-wheel)
(guess-requirements-from-source)))
(define (compute-inputs source-url wheel-url archive)
"Given the SOURCE-URL and WHEEL-URL of an already downloaded ARCHIVE, return
a pair of lists, each consisting of a list of name/variable pairs, for the
propagated inputs and the native inputs, respectively. Also
return the unaltered list of upstream dependency names."
(define (strip-argparse deps)
(remove (cut string=? "argparse" <>) deps))
(define (requirement->package-name/sort deps)
(sort
(map (lambda (input)
(let ((guix-name (python->package-name input)))
(list guix-name (list 'unquote (string->symbol guix-name)))))
deps)
(lambda args
(match args
(((a _ ...) (b _ ...))
(string-ci<? a b))))))
(define process-requirements
(compose requirement->package-name/sort strip-argparse))
(let ((dependencies (guess-requirements source-url wheel-url archive)))
(values (map process-requirements dependencies)
(concatenate dependencies))))
(define (make-pypi-sexp name version source-url wheel-url home-page synopsis
description license)
"Return the `package' s-expression for a python package with the given NAME,
VERSION, SOURCE-URL, HOME-PAGE, SYNOPSIS, DESCRIPTION, and LICENSE."
(call-with-temporary-output-file
(lambda (temp port)
(and (url-fetch source-url temp)
(receive (guix-dependencies upstream-dependencies)
(compute-inputs source-url wheel-url temp)
(match guix-dependencies
((required-inputs native-inputs)
(when (string-suffix? ".zip" source-url)
(set! native-inputs (cons
'("unzip" ,unzip)
native-inputs)))
(values
`(package
(name ,(python->package-name name))
(version ,version)
(source
(origin
(method url-fetch)
(uri (pypi-uri
;; PyPI URL are case sensitive, but sometimes
;; a project named using mixed case has a URL
;; using lower case, so we must work around this
;; inconsistency. For actual examples, compare
;; the URLs of the "Deprecated" and "uWSGI" PyPI
;; packages.
,(if (string-contains source-url name)
name
(string-downcase name))
version
;; Some packages have been released as `.zip`
;; instead of the more common `.tar.gz`. For
;; example, see "path-and-address".
,@(if (string-suffix? ".zip" source-url)
'(".zip")
'())))
(sha256
(base32
,(guix-hash-url temp)))))
(build-system python-build-system)
,@(maybe-inputs required-inputs 'propagated-inputs)
,@(maybe-inputs native-inputs 'native-inputs)
(home-page ,home-page)
(synopsis ,synopsis)
(description ,description)
(license ,(license->symbol license)))
upstream-dependencies))))))))
(define pypi->guix-package
(memoize
(lambda* (package-name #:key repo version)
"Fetch the metadata for PACKAGE-NAME from pypi.org, and return the
`package' s-expression corresponding to that package, or #f on failure."
(let* ((project (pypi-fetch package-name))
(info (and project (pypi-project-info project))))
(and project
(guard (c ((missing-source-error? c)
(let ((package (missing-source-error-package c)))
(leave (G_ "no source release for pypi package ~a ~a~%")
(project-info-name info)
(project-info-version info)))))
(make-pypi-sexp (project-info-name info)
(project-info-version info)
(and=> (latest-source-release project)
distribution-url)
(and=> (latest-wheel-release project)
distribution-url)
(project-info-home-page info)
(project-info-summary info)
(project-info-summary info)
(string->license
(project-info-license info)))))))))
(define (pypi-recursive-import package-name)
(recursive-import package-name
#:repo->guix-package pypi->guix-package
#:guix-name python->package-name))
(define (string->license str)
"Convert the string STR into a license object."
(match str
("GNU LGPL" license:lgpl2.0)
("GPL" license:gpl3)
((or "BSD" "BSD-3" "BSD License") license:bsd-3)
("BSD-2-Clause" license:bsd-2)
((or "MIT" "MIT license" "MIT License" "Expat license") license:expat)
("Public domain" license:public-domain)
((or "Apache License, Version 2.0" "Apache 2.0") license:asl2.0)
("MPL 2.0" license:mpl2.0)
(_ #f)))
(define pypi-package?
(url-predicate
(lambda (url)
(or (string-prefix? "https://pypi.org/" url)
(string-prefix? "https://pypi.python.org/" url)
(string-prefix? "https://pypi.org/packages" url)
(string-prefix? "https://files.pythonhosted.org/packages" url)))))
(define (latest-release package)
"Return an <upstream-source> for the latest release of PACKAGE."
(let* ((pypi-name (guix-package->pypi-name package))
(pypi-package (pypi-fetch pypi-name)))
(and pypi-package
(guard (c ((missing-source-error? c) #f))
(let* ((info (pypi-project-info pypi-package))
(version (project-info-version info))
(url (distribution-url
(latest-source-release pypi-package))))
(upstream-source
(package (package-name package))
(version version)
(urls (list url))))))))
(define %pypi-updater
(upstream-updater
(name 'pypi)
(description "Updater for PyPI packages")
(pred pypi-package?)
(latest latest-release)))
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