# Copyright 1999-2015 Gentoo Foundation # Distributed under the terms of the GNU General Public License v2 # $Id$ # @ECLASS: python-any-r1.eclass # @MAINTAINER: # Python team <python@gentoo.org> # @AUTHOR: # Author: Michał Górny <mgorny@gentoo.org> # Based on work of: Krzysztof Pawlik <nelchael@gentoo.org> # @BLURB: An eclass for packages having build-time dependency on Python. # @DESCRIPTION: # A minimal eclass for packages which need any Python interpreter # installed without a need for explicit choice and invariability. # This usually involves packages requiring Python at build-time # but having no other relevance to it. # # This eclass provides a minimal PYTHON_DEPS variable with a dependency # string on any of the supported Python implementations. It also exports # pkg_setup() which finds the best supported implementation and sets it # as the active one. # # Optionally, you can define a python_check_deps() function. It will # be called by the eclass with EPYTHON set to each matching Python # implementation and it is expected to check whether the implementation # fulfills the package requirements. You can use the locally exported # PYTHON_USEDEP to check USE-dependencies of relevant packages. It # should return a true value (0) if the Python implementation fulfills # the requirements, a false value (non-zero) otherwise. # # Please note that python-any-r1 will always inherit python-utils-r1 # as well. Thus, all the functions defined there can be used in the # packages using python-any-r1, and there is no need ever to inherit # both. # # For more information, please see the wiki: # https://wiki.gentoo.org/wiki/Project:Python/python-any-r1 case "${EAPI:-0}" in 0|1|2|3|4|5) # EAPI=4 needed by python-r1 ;; *) die "Unsupported EAPI=${EAPI} (unknown) for ${ECLASS}" ;; esac if [[ ! ${_PYTHON_ANY_R1} ]]; then if [[ ${_PYTHON_R1} ]]; then die 'python-any-r1.eclass can not be used with python-r1.eclass.' elif [[ ${_PYTHON_SINGLE_R1} ]]; then die 'python-any-r1.eclass can not be used with python-single-r1.eclass.' fi inherit python-utils-r1 fi EXPORT_FUNCTIONS pkg_setup if [[ ! ${_PYTHON_ANY_R1} ]]; then # @ECLASS-VARIABLE: PYTHON_COMPAT # @REQUIRED # @DESCRIPTION: # This variable contains a list of Python implementations the package # supports. It must be set before the `inherit' call. It has to be # an array. # # Example: # @CODE # PYTHON_COMPAT=( python{2_5,2_6,2_7} ) # @CODE if ! declare -p PYTHON_COMPAT &>/dev/null; then die 'PYTHON_COMPAT not declared.' fi # @ECLASS-VARIABLE: PYTHON_REQ_USE # @DEFAULT_UNSET # @DESCRIPTION: # The list of USEflags required to be enabled on the Python # implementations, formed as a USE-dependency string. It should be valid # for all implementations in PYTHON_COMPAT, so it may be necessary to # use USE defaults. # # Example: # @CODE # PYTHON_REQ_USE="gdbm,ncurses(-)?" # @CODE # # It will cause the Python dependencies to look like: # @CODE # || ( dev-lang/python:X.Y[gdbm,ncurses(-)?] ... ) # @CODE # @ECLASS-VARIABLE: PYTHON_DEPS # @DESCRIPTION: # This is an eclass-generated Python dependency string for all # implementations listed in PYTHON_COMPAT. # # Any of the supported interpreters will satisfy the dependency. # # Example use: # @CODE # DEPEND="${RDEPEND} # ${PYTHON_DEPS}" # @CODE # # Example value: # @CODE # || ( dev-lang/python:2.7[gdbm] # dev-lang/python:2.6[gdbm] ) # @CODE _python_build_set_globals() { local usestr i PYTHON_PKG_DEP [[ ${PYTHON_REQ_USE} ]] && usestr="[${PYTHON_REQ_USE}]" # check for invalid PYTHON_COMPAT for i in "${PYTHON_COMPAT[@]}"; do # the function simply dies on invalid impl _python_impl_supported "${i}" done PYTHON_DEPS= for i in "${_PYTHON_ALL_IMPLS[@]}"; do has "${i}" "${PYTHON_COMPAT[@]}" || continue python_export "${i}" PYTHON_PKG_DEP PYTHON_DEPS="${PYTHON_PKG_DEP} ${PYTHON_DEPS}" done PYTHON_DEPS="|| ( ${PYTHON_DEPS})" } _python_build_set_globals # @ECLASS-VARIABLE: PYTHON_USEDEP # @DESCRIPTION: # An eclass-generated USE-dependency string for the currently tested # implementation. It is set locally for python_check_deps() call. # # The generate USE-flag list is compatible with packages using python-r1, # python-single-r1 and python-distutils-ng eclasses. It must not be used # on packages using python.eclass. # # Example use: # @CODE # python_check_deps() { # has_version "dev-python/foo[${PYTHON_USEDEP}]" # } # @CODE # # Example value: # @CODE # python_targets_python2_7(-)?,python_single_target_python2_7(+)? # @CODE # @FUNCTION: python_gen_any_dep # @USAGE: <dependency-block> # @DESCRIPTION: # Generate an any-of dependency that enforces a version match between # the Python interpreter and Python packages. <dependency-block> needs # to list one or more dependencies with verbatim '${PYTHON_USEDEP}' # references (quoted!) that will get expanded inside the function. # # This should be used along with an appropriate python_check_deps() # that checks which of the any-of blocks were matched. # # Example use: # @CODE # DEPEND="$(python_gen_any_dep ' # dev-python/foo[${PYTHON_USEDEP}] # || ( dev-python/bar[${PYTHON_USEDEP}] # dev-python/baz[${PYTHON_USEDEP}] )')" # # python_check_deps() { # has_version "dev-python/foo[${PYTHON_USEDEP}]" \ # && { has_version "dev-python/bar[${PYTHON_USEDEP}]" \ # || has_version "dev-python/baz[${PYTHON_USEDEP}]"; } # } # @CODE # # Example value: # @CODE # || ( # ( # dev-lang/python:2.7 # dev-python/foo[python_targets_python2_7(-)?,python_single_target_python2_7(+)?] # || ( dev-python/bar[python_targets_python2_7(-)?,python_single_target_python2_7(+)?] # dev-python/baz[python_targets_python2_7(-)?,python_single_target_python2_7(+)?] ) # ) # ( # dev-lang/python:3.3 # dev-python/foo[python_targets_python3_3(-)?,python_single_target_python3_3(+)?] # || ( dev-python/bar[python_targets_python3_3(-)?,python_single_target_python3_3(+)?] # dev-python/baz[python_targets_python3_3(-)?,python_single_target_python3_3(+)?] ) # ) # ) # @CODE python_gen_any_dep() { debug-print-function ${FUNCNAME} "${@}" local depstr=${1} [[ ${depstr} ]] || die "No dependency string provided" local PYTHON_PKG_DEP out= for i in "${_PYTHON_ALL_IMPLS[@]}"; do has "${i}" "${PYTHON_COMPAT[@]}" || continue local PYTHON_USEDEP="python_targets_${i}(-),python_single_target_${i}(+)" python_export "${i}" PYTHON_PKG_DEP local i_depstr=${depstr//\$\{PYTHON_USEDEP\}/${PYTHON_USEDEP}} out="( ${PYTHON_PKG_DEP} ${i_depstr} ) ${out}" done echo "|| ( ${out})" } # @FUNCTION: _python_EPYTHON_supported # @USAGE: <epython> # @INTERNAL # @DESCRIPTION: # Check whether the specified implementation is supported by package # (specified in PYTHON_COMPAT). Calls python_check_deps() if declared. _python_EPYTHON_supported() { debug-print-function ${FUNCNAME} "${@}" local EPYTHON=${1} local i=${EPYTHON/./_} case "${i}" in python*|jython*|pypy*) ;; *) ewarn "Invalid EPYTHON: ${EPYTHON}" return 1 ;; esac if has "${i}" "${PYTHON_COMPAT[@]}"; then if python_is_installed "${i}"; then if declare -f python_check_deps >/dev/null; then local PYTHON_USEDEP="python_targets_${i}(-),python_single_target_${i}(+)" python_check_deps return ${?} fi return 0 fi elif ! has "${i}" "${_PYTHON_ALL_IMPLS[@]}"; then ewarn "Invalid EPYTHON: ${EPYTHON}" fi return 1 } # @FUNCTION: python_setup # @DESCRIPTION: # Determine what the best installed (and supported) Python # implementation is, and set the Python build environment up for it. # # This function will call python_check_deps() if defined. python_setup() { debug-print-function ${FUNCNAME} "${@}" # first, try ${EPYTHON}... maybe it's good enough for us. if [[ ${EPYTHON} ]]; then if _python_EPYTHON_supported "${EPYTHON}"; then python_export EPYTHON PYTHON python_wrapper_setup return fi fi # then, try eselect-python local variant i for variant in '' '--python2' '--python3'; do i=$(eselect python --show ${variant} 2>/dev/null) if [[ ! ${i} ]]; then # no eselect-python? break elif _python_EPYTHON_supported "${i}"; then python_export "${i}" EPYTHON PYTHON python_wrapper_setup return fi done # fallback to best installed impl. local rev_impls=() for i in "${_PYTHON_ALL_IMPLS[@]}"; do if has "${i}" "${PYTHON_COMPAT[@]}"; then rev_impls=( "${i}" "${rev_impls[@]}" ) fi done for i in "${rev_impls[@]}"; do python_export "${i}" EPYTHON PYTHON if _python_EPYTHON_supported "${EPYTHON}"; then python_wrapper_setup return fi done eerror "No Python implementation found for the build. This is usually" eerror "a bug in the ebuild. Please report it to bugs.gentoo.org" eerror "along with the build log." echo die "No supported Python implementation installed." } # @FUNCTION: python-any-r1_pkg_setup # @DESCRIPTION: # Runs python_setup during from-source installs. # # In a binary package installs is a no-op. If you need Python in pkg_* # phases of a binary package, call python_setup directly. python-any-r1_pkg_setup() { debug-print-function ${FUNCNAME} "${@}" [[ ${MERGE_TYPE} != binary ]] && python_setup } _PYTHON_ANY_R1=1 fi