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import: pypi: Also guess dependencies from *.egg-info/requires.txt.

* guix/import/pypi.scm (guess-requirements): Extract "requires.txt" from the
egg-info directory in addition to "requirements.txt"; strip off version
constraints; use call-with-temporary-directory.
gn-latest-20200428
Ricardo Wurmus 3 years ago
committed by Ricardo Wurmus
parent
commit
e37f889404
No known key found for this signature in database GPG Key ID: 197A5888235FACAC
  1. 54
      guix/import/pypi.scm

54
guix/import/pypi.scm

@ -3,6 +3,7 @@
;;; Copyright © 2015 Cyril Roelandt <tipecaml@gmail.com>
;;; Copyright © 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
;;; Copyright © 2018 Ricardo Wurmus <rekado@elephly.net>
;;;
;;; This file is part of GNU Guix.
;;;
@ -36,7 +37,8 @@
#:use-module (guix utils)
#:use-module ((guix build utils)
#:select ((package-name->name+version
. hyphen-package-name->name+version)))
. hyphen-package-name->name+version)
find-files))
#:use-module (guix import utils)
#:use-module ((guix download) #:prefix download:)
#:use-module (guix import json)
@ -114,9 +116,9 @@ package definition."
`((propagated-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."
"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 a temporary directory."
(define (tarball-directory url)
;; Given the URL of the package's tarball, return the name of the directory
@ -140,8 +142,8 @@ cannot determine package dependencies"))
;; 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))))
(or (string-index s (lambda (chr) (member chr '(#\space #\> #\= #\<))))
(string-length s))))
(define (comment? line)
;; Return #t if the given LINE is a comment, #f otherwise.
@ -197,31 +199,37 @@ cannot determine package dependencies"))
(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 (G_ "'tar xf' failed with exit code ~a\n")
exit-code)
'())))
(call-with-temporary-directory
(lambda (dir)
(let* ((pypi-name (string-take dirname (string-rindex dirname #\-)))
(req-files (list (string-append dirname "/requirements.txt")
(string-append dirname "/" pypi-name ".egg-info"
"/requires.txt")))
(exit-codes (map (lambda (file-name)
(parameterize ((current-error-port (%make-void-port "rw+"))
(current-output-port (%make-void-port "rw+")))
(system* "tar" "xf" tarball "-C" dir file-name)))
req-files)))
;; Only one of these files needs to exist.
(if (any zero? exit-codes)
(match (find-files dir)
((file . _)
(read-requirements file))
(()
(warning (G_ "No requirements file found.\n"))))
(begin
(warning (G_ "Failed to extract requirements files\n"))
'())))))
'())))
;; 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
;; getting them by reading either the "requirements.txt" file or the
;; "requires.txt" from the egg-info directory from the source tarball. Note
;; that "requirements.txt" is not mandatory, so this is likely to fail.
(or (guess-requirements-from-wheel)
(guess-requirements-from-source)))

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