guix-devel/guix/build/python-build-system.scm

259 lines
12 KiB
Scheme

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