259 lines
12 KiB
Scheme
259 lines
12 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2013, 2015, 2016 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2013 Andreas Enge <andreas@enge.fr>
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;;; Copyright © 2013 Nikita Karetnikov <nikita@karetnikov.org>
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;;; Copyright © 2015 Mark H Weaver <mhw@netris.org>
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;;; Copyright © 2016 Hartmut Goebel <h.goebel@crazy-compilers.com>
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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 build python-build-system)
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#:use-module ((guix build gnu-build-system) #:prefix gnu:)
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#:use-module (guix build utils)
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#:use-module (ice-9 match)
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#:use-module (ice-9 ftw)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-26)
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#:export (%standard-phases
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add-installed-pythonpath
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site-packages
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python-build))
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;; Commentary:
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;;
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;; Builder-side code of the standard Python package build procedure.
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;;
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;;
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;; Backgound about the Python installation methods
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;;
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;; In Python there are different ways to install packages: distutils,
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;; setuptools, easy_install and pip. All of these are sharing the file
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;; setup.py, introduced with distutils in Python 2.0. The setup.py file can be
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;; considered as a kind of Makefile accepting targets (or commands) like
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;; "build" and "install". As of autumn 2016 the recommended way to install
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;; Python packages is using pip.
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;;
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;; For both distutils and setuptools, running "python setup.py install" is the
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;; way to install Python packages. With distutils the "install" command
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;; basically copies all packages into <prefix>/lib/pythonX.Y/site-packages.
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;;
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;; Some time later "setuptools" was established to enhance distutils. To use
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;; setuptools, the developer imports setuptools in setup.py. When importing
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;; setuptools, the original "install" command gets overwritten by setuptools'
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;; "install" command.
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;;
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;; The command-line tools easy_install and pip are both capable of finding and
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;; downloading the package source from PyPI (the Python Package Index). Both
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;; of them import setuptools and execute the "setup.py" file under their
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;; control. Thus the "setup.py" behaves as if the developer had imported
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;; setuptools within setup.py - even is still using only distutils.
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;;
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;; Setuptools' "install" command (to be more precise: the "easy_install"
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;; command which is called by "install") will put the path of the currently
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;; installed version of each package and it's dependencies (as declared in
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;; setup.py) into an "easy-install.pth" file. In Guix each packages gets its
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;; own "site-packages" directory and thus an "easy-install.pth" of its own.
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;; To avoid conflicts, the python build system renames the file to
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;; <packagename>.pth in the phase rename-pth-file. To ensure that Python will
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;; process the .pth file, easy_install also creates a basic "site.py" in each
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;; "site-packages" directory. The file is the same for all packages, thus
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;; there is no need to rename it. For more information about .pth files and
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;; the site module, please refere to
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;; https://docs.python.org/3/library/site.html.
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;;
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;; The .pth files contain the file-system paths (pointing to the store) of all
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;; dependencies. So the dependency is hidden in the .pth file but is not
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;; visible in the file-system. Now if packages A and B both required packages
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;; P, but in different versions, Guix will not detect this when installing
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;; both A and B to a profile. (For details and example see
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;; https://lists.gnu.org/archive/html/guix-devel/2016-10/msg01233.html.)
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;;
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;; Pip behaves a bit different then easy_install: it always executes
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;; "setup.py" with the option "--single-version-externally-managed" set. This
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;; makes setuptools' "install" command run the original "install" command
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;; instead of the "easy_install" command, so no .pth file (and no site.py)
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;; will be created. The "site-packages" directory only contains the package
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;; and the related .egg-info directory.
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;;
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;; This is exactly what we need for Guix and this is what we mimic in the
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;; install phase below.
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;;
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;; As a draw back, the magic of the .pth file of linking to the other required
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;; packages is gone and these packages have now to be declared as
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;; "propagated-inputs".
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;;
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;; Note: Importing setuptools also adds two sub-commands: "install_egg_info"
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;; and "install_scripts". These sub-commands are executed even if
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;; "--single-version-externally-managed" is set, thus the .egg-info directory
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;; and the scripts defined in entry-points will always be created.
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(define setuptools-shim
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;; Run setup.py with "setuptools" being imported, which will patch
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;; "distutils". This is needed for packages using "distutils" instead of
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;; "setuptools" since the former does not understand the
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;; "--single-version-externally-managed" flag.
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;; Python code taken from pip 9.0.1 pip/utils/setuptools_build.py
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(string-append
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"import setuptools, tokenize;__file__='setup.py';"
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"f=getattr(tokenize, 'open', open)(__file__);"
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"code=f.read().replace('\\r\\n', '\\n');"
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"f.close();"
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"exec(compile(code, __file__, 'exec'))"))
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(define (call-setuppy command params use-setuptools?)
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(if (file-exists? "setup.py")
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(begin
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(format #t "running \"python setup.py\" with command ~s and parameters ~s~%"
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command params)
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(if use-setuptools?
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(zero? (apply system* "python" "-c" setuptools-shim
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command params))
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(zero? (apply system* "python" "./setup.py" command params))))
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(error "no setup.py found")))
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(define* (build #:key use-setuptools? #:allow-other-keys)
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"Build a given Python package."
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(call-setuppy "build" '() use-setuptools?))
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(define* (check #:key tests? test-target use-setuptools? #:allow-other-keys)
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"Run the test suite of a given Python package."
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(if tests?
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;; Running `setup.py test` creates an additional .egg-info directory in
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;; build/lib in some cases, e.g. if the source is in a sub-directory
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;; (given with `package_dir`). This will by copied to the output, too,
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;; so we need to remove.
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(let ((before (find-files "build" "\\.egg-info$" #:directories? #t)))
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(call-setuppy test-target '() use-setuptools?)
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(let* ((after (find-files "build" "\\.egg-info$" #:directories? #t))
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(inter (lset-difference eqv? after before)))
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(for-each delete-file-recursively inter)))
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#t))
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(define (get-python-version python)
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(let* ((version (last (string-split python #\-)))
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(components (string-split version #\.))
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(major+minor (take components 2)))
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(string-join major+minor ".")))
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(define (site-packages inputs outputs)
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"Return the path of the current output's Python site-package."
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(let* ((out (assoc-ref outputs "out"))
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(python (assoc-ref inputs "python")))
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(string-append out "/lib/python"
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(get-python-version python)
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"/site-packages/")))
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(define (add-installed-pythonpath inputs outputs)
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"Prepend the Python site-package of OUTPUT to PYTHONPATH. This is useful
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when running checks after installing the package."
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(let ((old-path (getenv "PYTHONPATH"))
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(add-path (site-packages inputs outputs)))
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(setenv "PYTHONPATH"
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(string-append add-path
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(if old-path (string-append ":" old-path) "")))
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#t))
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(define* (install #:key outputs (configure-flags '()) use-setuptools?
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#:allow-other-keys)
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"Install a given Python package."
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(let* ((out (assoc-ref outputs "out"))
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(params (append (list (string-append "--prefix=" out))
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(if use-setuptools?
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;; distutils does not accept these flags
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(list "--single-version-externally-managed"
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"--root=/")
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'())
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configure-flags)))
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(call-setuppy "install" params use-setuptools?)))
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(define* (wrap #:key inputs outputs #:allow-other-keys)
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(define (list-of-files dir)
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(map (cut string-append dir "/" <>)
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(or (scandir dir (lambda (f)
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(let ((s (stat (string-append dir "/" f))))
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(eq? 'regular (stat:type s)))))
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'())))
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(define bindirs
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(append-map (match-lambda
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((_ . dir)
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(list (string-append dir "/bin")
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(string-append dir "/sbin"))))
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outputs))
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(let* ((out (assoc-ref outputs "out"))
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(python (assoc-ref inputs "python"))
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(var `("PYTHONPATH" prefix
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,(cons (string-append out "/lib/python"
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(get-python-version python)
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"/site-packages")
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(search-path-as-string->list
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(or (getenv "PYTHONPATH") ""))))))
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(for-each (lambda (dir)
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(let ((files (list-of-files dir)))
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(for-each (cut wrap-program <> var)
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files)))
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bindirs)))
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(define* (rename-pth-file #:key name inputs outputs #:allow-other-keys)
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"Rename easy-install.pth to NAME.pth to avoid conflicts between packages
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installed with setuptools."
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;; Even if the "easy-install.pth" is not longer created, we kept this phase.
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;; There still may be packages creating an "easy-install.pth" manually for
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;; some good reason.
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(let* ((out (assoc-ref outputs "out"))
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(python (assoc-ref inputs "python"))
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(site-packages (string-append out "/lib/python"
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(get-python-version python)
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"/site-packages"))
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(easy-install-pth (string-append site-packages "/easy-install.pth"))
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(new-pth (string-append site-packages "/" name ".pth")))
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(when (file-exists? easy-install-pth)
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(rename-file easy-install-pth new-pth))
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#t))
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(define* (ensure-no-mtimes-pre-1980 #:rest _)
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"Ensure that there are no mtimes before 1980-01-02 in the source tree."
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;; Rationale: patch-and-repack creates tarballs with timestamps at the POSIX
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;; epoch, 1970-01-01 UTC. This causes problems with Python packages,
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;; because Python eggs are ZIP files, and the ZIP format does not support
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;; timestamps before 1980.
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(let ((early-1980 315619200)) ; 1980-01-02 UTC
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(ftw "." (lambda (file stat flag)
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(unless (<= early-1980 (stat:mtime stat))
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(utime file early-1980 early-1980))
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#t))
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#t))
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(define %standard-phases
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;; 'configure' phase is not needed.
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(modify-phases gnu:%standard-phases
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(add-after 'unpack 'ensure-no-mtimes-pre-1980 ensure-no-mtimes-pre-1980)
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(delete 'configure)
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(replace 'install install)
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(replace 'check check)
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(replace 'build build)
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(add-after 'install 'wrap wrap)
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(add-before 'strip 'rename-pth-file rename-pth-file)))
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(define* (python-build #:key inputs (phases %standard-phases)
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#:allow-other-keys #:rest args)
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"Build the given Python package, applying all of PHASES in order."
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(apply gnu:gnu-build #:inputs inputs #:phases phases args))
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;;; python-build-system.scm ends here
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