;;; GNU Guix --- Functional package management for GNU ;;; Copyright © 2014 David Thompson ;;; Copyright © 2015 Cyril Roelandt ;;; Copyright © 2015, 2016 Ludovic Courtès ;;; ;;; 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 . (define-module (guix import pypi) #:use-module (ice-9 binary-ports) #:use-module (ice-9 match) #:use-module (ice-9 pretty-print) #:use-module (ice-9 regex) #:use-module ((ice-9 rdelim) #:select (read-line)) #:use-module (srfi srfi-1) #:use-module (srfi srfi-26) #:use-module (srfi srfi-34) #:use-module (srfi srfi-35) #:use-module (rnrs bytevectors) #:use-module (json) #:use-module (web uri) #:use-module (guix ui) #:use-module (guix utils) #:use-module (guix import utils) #:use-module ((guix download) #:prefix download:) #:use-module (guix import json) #:use-module (guix packages) #:use-module (guix upstream) #:use-module (guix licenses) #:use-module (guix build-system python) #:use-module (gnu packages python) #:export (pypi->guix-package %pypi-updater)) (define (pypi-fetch name) "Return an alist representation of the PyPI metadata for the package NAME, or #f on failure." ;; XXX: We want to silence the download progress report, which is especially ;; annoying for 'guix refresh', but we have to use a file port. (call-with-output-file "/dev/null" (lambda (null) (with-error-to-port null (lambda () (json-fetch (string-append "https://pypi.python.org/pypi/" name "/json"))))))) ;; 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-package "releases" (assoc-ref* pypi-package "info" "version")))) (or (find (lambda (release) (string=? "sdist" (assoc-ref release "packagetype"))) 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-package "releases" (assoc-ref* pypi-package "info" "version")))) (or (find (lambda (release) (string=? "bdist_wheel" (assoc-ref release "packagetype"))) 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.python.org, return the name of the package on PyPI." (let ((source-url (and=> (package-source package) origin-uri))) ;; The URL has the form: ;; 'https://pypi.python.org/packages/source/' + ;; first letter of the package name + ;; '/' + package name + '/' + ... (substring source-url 42 (string-rindex source-url #\/)))) (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) "Given a list of PACKAGE-INPUTS, tries to generate the 'inputs' field of a package definition." (match package-inputs (() '()) ((package-inputs ...) `((inputs (,'quasiquote ,package-inputs)))))) (define (guess-requirements source-url wheel-url tarball) "Given SOURCE-URL, WHEEL-URL and a TARBALL of the package, return a list of the required packages specified in the requirements.txt file. TARBALL will be extracted in the current directory, and will be deleted." (define (tarball-directory url) ;; Given the URL of the package's tarball, return the name of the directory ;; that will be created upon decompressing it. If the filetype is not ;; supported, return #f. ;; TODO: Support more archive formats. (let ((basename (substring url (+ 1 (string-rindex url #\/))))) (cond ((string-suffix? ".tar.gz" basename) (string-drop-right basename 7)) ((string-suffix? ".tar.bz2" basename) (string-drop-right basename 8)) (else (begin (warning (_ "Unsupported archive format: \ cannot determine package dependencies")) #f))))) (define (clean-requirement s) ;; Given a requirement LINE, as can be found in a Python requirements.txt ;; file, remove everything other than the actual name of the required ;; package, and return it. (string-take s (or (string-index s #\space) (string-length s)))) (define (comment? line) ;; Return #t if the given LINE is a comment, #f otherwise. (eq? (string-ref (string-trim line) 0) #\#)) (define (read-requirements requirements-file) ;; Given REQUIREMENTS-FILE, a Python requirements.txt file, return a list ;; of name/variable pairs describing the requirements. (call-with-input-file requirements-file (lambda (port) (let loop ((result '())) (let ((line (read-line port))) (if (eof-object? line) result (cond ((or (string-null? line) (comment? line)) (loop result)) (else (loop (cons (python->package-name (clean-requirement line)) result)))))))))) (define (read-wheel-metadata wheel-archive) ;; Given WHEEL-ARCHIVE, a ZIP Python wheel archive, return the package's ;; requirements. (let* ((dirname (wheel-url->extracted-directory wheel-url)) (json-file (string-append dirname "/metadata.json"))) (and (zero? (system* "unzip" "-q" wheel-archive json-file)) (dynamic-wind (const #t) (lambda () (call-with-input-file json-file (lambda (port) (let* ((metadata (json->scm port)) (run_requires (hash-ref metadata "run_requires")) (requirements (if run_requires (hash-ref (list-ref run_requires 0) "requires") '()))) (map (lambda (r) (python->package-name (clean-requirement r))) requirements))))) (lambda () (delete-file json-file) (rmdir dirname)))))) (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. (let ((dirname (tarball-directory source-url))) (if (string? dirname) (let* ((req-file (string-append dirname "/requirements.txt")) (exit-code (system* "tar" "xf" tarball req-file))) ;; TODO: support more formats. (if (zero? exit-code) (dynamic-wind (const #t) (lambda () (read-requirements req-file)) (lambda () (delete-file req-file) (rmdir dirname))) (begin (warning (_ "'tar xf' failed with exit code ~a\n") exit-code) '()))) '()))) ;; First, try to compute the requirements using the wheel, since that is the ;; most reliable option. If a wheel is not provided for this package, try ;; getting them by reading the "requirements.txt" file from the source. Note ;; that "requirements.txt" is not mandatory, so this is likely to fail. (or (guess-requirements-from-wheel) (guess-requirements-from-source))) (define (compute-inputs source-url wheel-url tarball) "Given the SOURCE-URL of an already downloaded TARBALL, return a list of name/variable pairs describing the required inputs of this package." (sort (map (lambda (input) (list input (list 'unquote (string->symbol input)))) (append '("python-setuptools") ;; Argparse has been part of Python since 2.7. (remove (cut string=? "python-argparse" <>) (guess-requirements source-url wheel-url tarball)))) (lambda args (match args (((a _ ...) (b _ ...)) (string-cipackage-name name)) (version ,version) (source (origin (method url-fetch) ;; Sometimes 'pypi-uri' doesn't quite work due to mixed ;; cases in NAME, for instance, as is the case with ;; "uwsgi". In that case, fall back to a full URL. (uri ,(if (equal? (pypi-uri name version) source-url) `(pypi-uri ,name version) `(string-append ,@(factorize-uri source-url version)))) (sha256 (base32 ,(guix-hash-url temp))))) (build-system python-build-system) ,@(maybe-inputs (compute-inputs source-url wheel-url temp)) (home-page ,home-page) (synopsis ,synopsis) (description ,description) (license ,(license->symbol license))))))) (define (pypi->guix-package package-name) "Fetch the metadata for PACKAGE-NAME from pypi.python.org, and return the `package' s-expression corresponding to that package, or #f on failure." (let ((package (pypi-fetch package-name))) (and package (guard (c ((missing-source-error? c) (let ((package (missing-source-error-package c))) (leave (_ "no source release for pypi package ~a ~a~%") (assoc-ref* package "info" "name") (assoc-ref* package "info" "version"))))) (let ((name (assoc-ref* package "info" "name")) (version (assoc-ref* package "info" "version")) (release (assoc-ref (latest-source-release package) "url")) (wheel (assoc-ref (latest-wheel-release package) "url")) (synopsis (assoc-ref* package "info" "summary")) (description (assoc-ref* package "info" "summary")) (home-page (assoc-ref* package "info" "home_page")) (license (string->license (assoc-ref* package "info" "license")))) (make-pypi-sexp name version release wheel home-page synopsis description license)))))) (define (pypi-package? package) "Return true if PACKAGE is a Python package from PyPI." (define (pypi-url? url) (string-prefix? "https://pypi.python.org/" url)) (let ((source-url (and=> (package-source package) origin-uri)) (fetch-method (and=> (package-source package) origin-method))) (and (eq? fetch-method download:url-fetch) (match source-url ((? string?) (pypi-url? source-url)) ((source-url ...) (any pypi-url? source-url)))))) (define (latest-release package) "Return an for the latest release of PACKAGE." (guard (c ((missing-source-error? c) #f)) (let* ((pypi-name (guix-package->pypi-name package)) (metadata (pypi-fetch pypi-name)) (version (assoc-ref* metadata "info" "version")) (url (assoc-ref (latest-source-release metadata) "url"))) (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)))