From: Thomas Petazzoni Date: Wed, 11 Dec 2013 20:26:36 +0000 (+0100) Subject: package: introduce Python package infrastructure X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=a6bba674a257f291c51a3859381f653e711bd354;p=buildroot.git package: introduce Python package infrastructure [Peter: fix s/BUILD_TYPE/SETUP_TYPE/ typo in manual as noted by Samuel] Signed-off-by: Thomas Petazzoni Signed-off-by: Peter Korsgaard --- diff --git a/docs/manual/adding-packages-python.txt b/docs/manual/adding-packages-python.txt new file mode 100644 index 0000000000..b8d5331b1d --- /dev/null +++ b/docs/manual/adding-packages-python.txt @@ -0,0 +1,159 @@ +// -*- mode:doc; -*- +// vim: set syntax=asciidoc: + +Infrastructure for Python packages +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +This infrastructure applies to Python packages that use the standard +Python setuptools mechanism as their build system, generally +recognizable by the usage of a +setup.py+ script. + +[[python-package-tutorial]] + ++python-package+ tutorial +^^^^^^^^^^^^^^^^^^^^^^^^^ + +First, let's see how to write a +.mk+ file for a Python package, +with an example : + +------------------------ +01: ################################################################################ +02: # +03: # python-foo +04: # +05: ################################################################################ +06: +07: PYTHON_FOO_VERSION = 1.0 +08: PYTHON_FOO_SOURCE = python-foo-$(LIBFOO_VERSION).tar.xz +09: PYTHON_FOO_SITE = http://www.foosoftware.org/download +10: PYTHON_FOO_LICENSE = BSD-3c +11: PYTHON_FOO_LICENSE_FILES = LICENSE +12: PYTHON_FOO_ENV = SOME_VAR=1 +13: PYTHON_FOO_DEPENDENCIES = libmad +14: PYTHON_FOO_SETUP_TYPE = distutils +15: +16: $(eval $(python-package)) +------------------------ + +On line 7, we declare the version of the package. + +On line 8 and 9, we declare the name of the tarball (xz-ed tarball +recommended) and the location of the tarball on the Web. Buildroot +will automatically download the tarball from this location. + +On line 10 and 11, we give licensing details about the package (its +license on line 10, and the file containing the license text on line +11). + +On line 12, we tell Buildroot to pass custom options to the Python ++setup.py+ script when it is configuring the package. + +On line 13, we declare our dependencies, so that they are built +before the build process of our package starts. + +On line 14, we declare the specific Python build system being used. In +this case the +distutils+ Python build system is used. The two +supported ones are +distutils+ and +setuptools+. + +Finally, on line 16, we invoke the +python-package+ macro that +generates all the Makefile rules that actually allow the package to be +built. + +[[python-package-reference]] + ++python-package+ reference +^^^^^^^^^^^^^^^^^^^^^^^^^^ + +As a policy, packages that merely provide Python modules should all be +named +python-+ in Buildroot. Other packages that use the +Python build system, but are not Python modules, can freely choose +their name (existing examples in Buildroot are +scons+ and ++supervisor+). + +In their +Config.in+ file, they should depend on +BR2_PACKAGE_PYTHON+ +so that when Buildroot will enable Python 3 usage for modules, we will +be able to enable Python modules progressively on Python 3. + +The main macro of the Python package infrastructure is ++python-package+. It is similar to the +generic-package+ macro. It is +also possible to create Python host packages with the ++host-python-package+ macro. + +Just like the generic infrastructure, the Python infrastructure works +by defining a number of variables before calling the +python-package+ +or +host-python-package+ macros. + +All the package metadata information variables that exist in the +xref:generic-package-reference[generic package infrastructure] also +exist in the Python infrastructure: +PYTHON_FOO_VERSION+, ++PYTHON_FOO_SOURCE+, +PYTHON_FOO_PATCH+, +PYTHON_FOO_SITE+, ++PYTHON_FOO_SUBDIR+, +PYTHON_FOO_DEPENDENCIES+, +PYTHON_FOO_LICENSE+, ++PYTHON_FOO_LICENSE_FILES+, etc. + +Note that: + + * Setting +PYTHON_FOO_INSTALL_STAGING+ to +YES+ has no effect (unless + a +PYTHON_FOO_INSTALL_STAGING_CMDS+ variable is defined), since + Python modules generally don't need to be installed to the + +staging+ directory. + + * It is not necessary to add +python+ or +host-python+ in the + +PYTHON_FOO_DEPENDENCIES+ variable of a package, since these basic + dependencies are automatically added as needed by the Python + package infrastructure. + + * Similarly, it is not needed to add +host-setuptools+ and/or + +host-distutilscross+ dependencies to +PYTHON_FOO_DEPENDENCIES+ for + setuptools-based packages, since these are automatically added by + the Python infrastructure as needed. + +One variable specific to the Python infrastructure is mandatory: + +* +PYTHON_FOO_SETUP_TYPE+, to define which Python build system is used + by the package. The two supported values are +distutils+ and + +setuptools+. If you don't know which one is used in your package, + look at the +setup.py+ file in your package source code, and see + whether it imports things from the +distutils+ module or the + +setuptools+ module. + +A few additional variables, specific to the Python infrastructure, can +optionally be defined, depending on the package's needs. Many of them +are only useful in very specific cases, typical packages will +therefore only use a few of them, or none. + +* +PYTHON_FOO_ENV+, to specify additional environment variables to + pass to the Python +setup.py+ script (for both the build and install + steps). Note that the infrastructure is automatically passing + several standard variables, defined in +PKG_PYTHON_DISTUTILS_ENV+ + (for distutils target packages), +HOST_PKG_PYTHON_DISTUTILS_ENV+ + (for distutils host packages), +PKG_PYTHON_SETUPTOOLS_ENV+ (for + setuptools target packages) and +HOST_PKG_PYTHON_SETUPTOOLS_ENV+ + (for setuptools host packages). + +* +PYTHON_FOO_BUILD_OPT+, to specify additional options to pass to the + Python +setup.py+ script during the build step. For target distutils + packages, the +PKG_PYTHON_DISTUTILS_BUILD_OPT+ options are already + passed automatically by the infrastructure. + +* +PYTHON_FOO_INSTALL_OPT+, to specify additional options to pass to + the Python +setup.py+ script during the installation step. Note that + the infrastructure is automatically passing some options, defined in + +PKG_PYTHON_DISTUTILS_INSTALL_OPT+ (for target distutils packages), + +HOST_PKG_PYTHON_DISTUTILS_INSTALL_OPT+ (for host distutils + packages), +PKG_PYTHON_SETUPTOOLS_INSTALL_OPT+ (for target + setuptools packages) and +HOST_PKG_PYTHON_SETUPTOOLS_INSTALL_OPT+ + (for host setuptools packages). + +With the Python infrastructure, all the steps required to build and +install the packages are already defined, and they generally work well +for most Python-based packages. However, when required, it is still +possible to customize what is done in any particular step: + +* By adding a post-operation hook (after extract, patch, configure, + build or install). See xref:hooks[] for details. + +* By overriding one of the steps. For example, even if the Python + infrastructure is used, if the package +.mk+ file defines its own + +PYTHON_FOO_BUILD_CMDS+ variable, it will be used instead of the + default Python one. However, using this method should be restricted + to very specific cases. Do not use it in the general case. diff --git a/docs/manual/adding-packages.txt b/docs/manual/adding-packages.txt index ae76e74e21..01277d80db 100644 --- a/docs/manual/adding-packages.txt +++ b/docs/manual/adding-packages.txt @@ -18,6 +18,8 @@ include::adding-packages-autotools.txt[] include::adding-packages-cmake.txt[] +include::adding-packages-python.txt[] + include::adding-packages-hooks.txt[] include::adding-packages-gettext.txt[] diff --git a/package/Makefile.in b/package/Makefile.in index 7bc06065ac..f5d62899b4 100644 --- a/package/Makefile.in +++ b/package/Makefile.in @@ -371,4 +371,5 @@ include package/pkg-utils.mk include package/pkg-download.mk include package/pkg-autotools.mk include package/pkg-cmake.mk +include package/pkg-python.mk include package/pkg-generic.mk diff --git a/package/pkg-python.mk b/package/pkg-python.mk new file mode 100644 index 0000000000..e436f22aaa --- /dev/null +++ b/package/pkg-python.mk @@ -0,0 +1,219 @@ +################################################################################ +# Python package infrastructure +# +# This file implements an infrastructure that eases development of +# package .mk files for Python packages. It should be used for all +# packages that use Python setup.py/setuptools as their build system. +# +# See the Buildroot documentation for details on the usage of this +# infrastructure +# +# In terms of implementation, this Python infrastructure requires the +# .mk file to only specify metadata informations about the package: +# name, version, download URL, etc. +# +# We still allow the package .mk file to override what the different +# steps are doing, if needed. For example, if _BUILD_CMDS is +# already defined, it is used as the list of commands to perform to +# build the package, instead of the default Python behaviour. The +# package can also define some post operation hooks. +# +################################################################################ + +# Target distutils-based packages +PKG_PYTHON_DISTUTILS_ENV = \ + PATH="$(TARGET_PATH)" \ + CC="$(TARGET_CC)" \ + CFLAGS="$(TARGET_CFLAGS)" \ + LDFLAGS="$(TARGET_LDFLAGS)" \ + LDSHARED="$(TARGET_CROSS)gcc -shared" \ + CROSS_COMPILING=yes \ + _python_sysroot=$(STAGING_DIR) \ + _python_srcdir=$(PYTHON_DIR) \ + _python_prefix=/usr \ + _python_exec_prefix=/usr + +PKG_PYTHON_DISTUTILS_BUILD_OPT = \ + --executable=/usr/bin/python + +PKG_PYTHON_DISTUTILS_INSTALL_OPT = \ + --prefix=$(TARGET_DIR)/usr + +# Host distutils-based packages +HOST_PKG_PYTHON_DISTUTILS_ENV = \ + PATH="$(HOST_PATH)" + +HOST_PKG_PYTHON_DISTUTILS_INSTALL_OPT = \ + --prefix=$(HOST_DIR)/usr + +# Target setuptools-based packages +PKG_PYTHON_SETUPTOOLS_ENV = \ + PATH="$(TARGET_PATH)" \ + PYTHONPATH="$(TARGET_DIR)/usr/lib/python$(PYTHON_VERSION_MAJOR)/site-packages" \ + PYTHONXCPREFIX="$(STAGING_DIR)/usr/" + +PKG_PYTHON_SETUPTOOLS_INSTALL_OPT = \ + --prefix=$(TARGET_DIR)/usr \ + --executable=/usr/bin/python \ + --single-version-externally-managed \ + --root=/ + +# Host setuptools-based packages +HOST_PKG_PYTHON_SETUPTOOLS_ENV = \ + PATH="$(HOST_PATH)" \ + PYTHONXCPREFIX="$(HOST_DIR)/usr/" + +HOST_PKG_PYTHON_SETUPTOOLS_INSTALL_OPT = \ + --prefix=$(HOST_DIR)/usr + +################################################################################ +# inner-python-package -- defines how the configuration, compilation +# and installation of a Python package should be done, implements a +# few hooks to tune the build process and calls the generic package +# infrastructure to generate the necessary make targets +# +# argument 1 is the lowercase package name +# argument 2 is the uppercase package name, including an HOST_ prefix +# for host packages +# argument 3 is the uppercase package name, without the HOST_ prefix +# for host packages +# argument 4 is the package directory prefix +# argument 5 is the type (target or host) +################################################################################ + +define inner-python-package + +$(2)_SRCDIR = $$($(2)_DIR)/$($(2)_SUBDIR) +$(2)_BUILDDIR = $$($(2)_SRCDIR) + +$(2)_ENV ?= +$(2)_BUILD_OPT ?= +$(2)_INSTALL_OPT ?= + +ifndef $(2)_SETUP_TYPE + ifdef $(3)_SETUP_TYPE + $(2)_SETUP_TYPE = $($(3)_SETUP_TYPE) + else + $$(error "$(1): Unknown or undefined _SETUP_TYPE") + endif +endif + +# Distutils +ifeq ($$($(2)_SETUP_TYPE),distutils) +ifeq ($(5),target) +$(2)_BASE_ENV = $$(PKG_PYTHON_DISTUTILS_ENV) +$(2)_BASE_BUILD_TGT = build +$(2)_BASE_BUILD_OPT = $$(PKG_PYTHON_DISTUTILS_BUILD_OPT) +$(2)_BASE_INSTALL_OPT = $$(PKG_PYTHON_DISTUTILS_INSTALL_OPT) +else +$(2)_BASE_ENV = $$(HOST_PKG_PYTHON_DISTUTILS_ENV) +$(2)_BASE_BUILD_TGT = build +$(2)_BASE_BUILD_OPT = +$(2)_BASE_INSTALL_OPT = $$(HOST_PKG_PYTHON_DISTUTILS_INSTALL_OPT) +endif +# Setuptools +else ifeq ($$($(2)_SETUP_TYPE),setuptools) +ifeq ($(5),target) +$(2)_BASE_ENV = $$(PKG_PYTHON_SETUPTOOLS_ENV) +$(2)_BASE_BUILD_TGT = build -x +$(2)_BASE_BUILD_OPT = +$(2)_BASE_INSTALL_OPT = $$(PKG_PYTHON_SETUPTOOLS_INSTALL_OPT) +else +$(2)_BASE_ENV = $$(HOST_PKG_PYTHON_SETUPTOOLS_ENV) +$(2)_BASE_BUILD_TGT = build +$(2)_BASE_BUILD_OPT = +$(2)_BASE_INSTALL_OPT = $$(HOST_PKG_PYTHON_SETUPTOOLS_INSTALL_OPT) +endif +endif + +# The below statement intends to calculate the dependencies of host +# packages by derivating them from the dependencies of the +# corresponding target package, after adding the 'host-' prefix in +# front of the dependencies. +# +# However it must be repeated from inner-generic-package, as we need +# to exclude the python, host-python, host-python-setuptools and +# host-distutilscross packages, which are added below in the list of +# dependencies depending on the package characteristics, and shouldn't +# be derived automatically from the dependencies of the corresponding +# target package. For example, target packages need +# host-python-distutilscross, but not host packages. +$(2)_DEPENDENCIES ?= $(filter-out host-python host-python-setuptools host-python-distutilscross $(1),$(patsubst host-host-%,host-%,$(addprefix host-,$($(3)_DEPENDENCIES)))) + +# Target packages need both the python interpreter on the target (for +# runtime) and the python interpreter on the host (for +# compilation). However, host packages only need the python +# interpreter on the host. +ifeq ($(5),target) +$(2)_DEPENDENCIES += host-python python +else +$(2)_DEPENDENCIES += host-python +endif + +# Setuptools based packages will need host-python-setuptools (both +# host and target) and host-python-distutilscross (only target +# packages). We need to have a special exclusion for the +# host-setuptools package itself: it is setuptools-based, but +# shouldn't depend on host-setuptools (because it would otherwise +# depend on itself!). +ifeq ($$($(2)_SETUP_TYPE),setuptools) +ifneq ($(2),HOST_PYTHON_SETUPTOOLS) +$(2)_DEPENDENCIES += host-python-setuptools +ifeq ($(5),target) +$(2)_DEPENDENCIES += host-python-distutilscross +endif +endif +endif + +# +# Build step. Only define it if not already defined by the package .mk +# file. +# +ifndef $(2)_BUILD_CMDS +define $(2)_BUILD_CMDS + (cd $$($$(PKG)_BUILDDIR)/; \ + $$($$(PKG)_BASE_ENV) $$($$(PKG)_ENV) \ + $(HOST_DIR)/usr/bin/python setup.py \ + $$($$(PKG)_BASE_BUILD_TGT) \ + $$($$(PKG)_BASE_BUILD_OPT) $$($$(PKG)_BUILD_OPT)) +endef +endif + +# +# Host installation step. Only define it if not already defined by the +# package .mk file. +# +ifndef $(2)_INSTALL_CMDS +define $(2)_INSTALL_CMDS + (cd $$($$(PKG)_BUILDDIR)/; \ + $$($$(PKG)_BASE_ENV) $$($$(PKG)_ENV) \ + $(HOST_DIR)/usr/bin/python setup.py install \ + $$($$(PKG)_BASE_INSTALL_OPT) $$($$(PKG)_INSTALL_OPT)) +endef +endif + +# +# Target installation step. Only define it if not already defined by +# the package .mk file. +# +ifndef $(2)_INSTALL_TARGET_CMDS +define $(2)_INSTALL_TARGET_CMDS + (cd $$($$(PKG)_BUILDDIR)/; \ + $$($$(PKG)_BASE_ENV) $$($$(PKG)_ENV) \ + $(HOST_DIR)/usr/bin/python setup.py install \ + $$($$(PKG)_BASE_INSTALL_OPT) $$($$(PKG)_INSTALL_OPT)) +endef +endif + +# Call the generic package infrastructure to generate the necessary +# make targets +$(call inner-generic-package,$(1),$(2),$(3),$(4),$(5)) + +endef + +################################################################################ +# python-package -- the target generator macro for Python packages +################################################################################ + +python-package = $(call inner-python-package,$(call pkgname),$(call UPPERCASE,$(call pkgname)),$(call UPPERCASE,$(call pkgname)),$(call pkgparentdir),target) +host-python-package = $(call inner-python-package,host-$(call pkgname),$(call UPPERCASE,host-$(call pkgname)),$(call UPPERCASE,$(call pkgname)),$(call pkgparentdir),host)