1 # Copyright 1999-2018 Gentoo Foundation
2 # Distributed under the terms of the GNU General Public License v2
4 # @ECLASS: python-any-r1.eclass
6 # Python team <python@gentoo.org>
8 # Author: Michał Górny <mgorny@gentoo.org>
9 # Based on work of: Krzysztof Pawlik <nelchael@gentoo.org>
10 # @SUPPORTED_EAPIS: 0 1 2 3 4 5 6 7
11 # @BLURB: An eclass for packages having build-time dependency on Python.
13 # A minimal eclass for packages which need any Python interpreter
14 # installed without a need for explicit choice and invariability.
15 # This usually involves packages requiring Python at build-time
16 # but having no other relevance to it.
18 # This eclass provides a minimal PYTHON_DEPS variable with a dependency
19 # string on any of the supported Python implementations. It also exports
20 # pkg_setup() which finds the best supported implementation and sets it
23 # Optionally, you can define a python_check_deps() function. It will
24 # be called by the eclass with EPYTHON set to each matching Python
25 # implementation and it is expected to check whether the implementation
26 # fulfills the package requirements. You can use the locally exported
27 # PYTHON_USEDEP to check USE-dependencies of relevant packages. It
28 # should return a true value (0) if the Python implementation fulfills
29 # the requirements, a false value (non-zero) otherwise.
31 # Please note that python-any-r1 will always inherit python-utils-r1
32 # as well. Thus, all the functions defined there can be used in the
33 # packages using python-any-r1, and there is no need ever to inherit
36 # For more information, please see the wiki:
37 # https://wiki.gentoo.org/wiki/Project:Python/python-any-r1
43 die "Unsupported EAPI=${EAPI} (unknown) for ${ECLASS}"
47 if [[ ! ${_PYTHON_ANY_R1} ]]; then
49 if [[ ${_PYTHON_R1} ]]; then
50 die 'python-any-r1.eclass can not be used with python-r1.eclass.'
51 elif [[ ${_PYTHON_SINGLE_R1} ]]; then
52 die 'python-any-r1.eclass can not be used with python-single-r1.eclass.'
55 inherit python-utils-r1
59 EXPORT_FUNCTIONS pkg_setup
61 # @ECLASS-VARIABLE: PYTHON_COMPAT
64 # This variable contains a list of Python implementations the package
65 # supports. It must be set before the `inherit' call. It has to be
70 # PYTHON_COMPAT=( python{2_5,2_6,2_7} )
73 # @ECLASS-VARIABLE: PYTHON_COMPAT_OVERRIDE
76 # This variable can be used when working with ebuilds to override
77 # the in-ebuild PYTHON_COMPAT. It is a string naming the implementation
78 # which will be used to build the package. It needs to be specified
79 # in the calling environment, and not in ebuilds.
81 # It should be noted that in order to preserve metadata immutability,
82 # PYTHON_COMPAT_OVERRIDE does not affect dependencies. The value of
83 # EPYTHON and eselect-python preferences are ignored. Dependencies need
84 # to be satisfied manually.
88 # PYTHON_COMPAT_OVERRIDE='pypy' emerge -1v dev-python/bar
91 # @ECLASS-VARIABLE: PYTHON_REQ_USE
94 # The list of USEflags required to be enabled on the Python
95 # implementations, formed as a USE-dependency string. It should be valid
96 # for all implementations in PYTHON_COMPAT, so it may be necessary to
101 # PYTHON_REQ_USE="gdbm,ncurses(-)?"
104 # It will cause the Python dependencies to look like:
106 # || ( dev-lang/python:X.Y[gdbm,ncurses(-)?] ... )
109 # @ECLASS-VARIABLE: PYTHON_DEPS
111 # This is an eclass-generated Python dependency string for all
112 # implementations listed in PYTHON_COMPAT.
114 # Any of the supported interpreters will satisfy the dependency.
124 # || ( dev-lang/python:2.7[gdbm]
125 # dev-lang/python:2.6[gdbm] )
128 # @ECLASS-VARIABLE: PYTHON_USEDEP
130 # An eclass-generated USE-dependency string for the currently tested
131 # implementation. It is set locally for python_check_deps() call.
133 # The generate USE-flag list is compatible with packages using python-r1,
134 # python-single-r1 and python-distutils-ng eclasses. It must not be used
135 # on packages using python.eclass.
139 # python_check_deps() {
140 # has_version "dev-python/foo[${PYTHON_USEDEP}]"
146 # python_targets_python2_7(-)?,python_single_target_python2_7(+)?
149 _python_any_set_globals() {
150 local usestr deps i PYTHON_PKG_DEP
151 [[ ${PYTHON_REQ_USE} ]] && usestr="[${PYTHON_REQ_USE}]"
155 for i in "${_PYTHON_SUPPORTED_IMPLS[@]}"; do
156 python_export "${i}" PYTHON_PKG_DEP
158 # note: need to strip '=' slot operator for || deps
159 deps="${PYTHON_PKG_DEP%=} ${deps}"
163 if [[ ${PYTHON_DEPS+1} ]]; then
164 if [[ ${PYTHON_DEPS} != "${deps}" ]]; then
165 eerror "PYTHON_DEPS have changed between inherits (PYTHON_REQ_USE?)!"
166 eerror "Before: ${PYTHON_DEPS}"
167 eerror "Now : ${deps}"
168 die "PYTHON_DEPS integrity check failed"
175 _python_any_set_globals
176 unset -f _python_any_set_globals
178 if [[ ! ${_PYTHON_ANY_R1} ]]; then
180 # @FUNCTION: python_gen_any_dep
181 # @USAGE: <dependency-block>
183 # Generate an any-of dependency that enforces a version match between
184 # the Python interpreter and Python packages. <dependency-block> needs
185 # to list one or more dependencies with verbatim '${PYTHON_USEDEP}'
186 # references (quoted!) that will get expanded inside the function.
188 # This should be used along with an appropriate python_check_deps()
189 # that checks which of the any-of blocks were matched.
193 # DEPEND="$(python_gen_any_dep '
194 # dev-python/foo[${PYTHON_USEDEP}]
195 # || ( dev-python/bar[${PYTHON_USEDEP}]
196 # dev-python/baz[${PYTHON_USEDEP}] )')"
198 # python_check_deps() {
199 # has_version "dev-python/foo[${PYTHON_USEDEP}]" \
200 # && { has_version "dev-python/bar[${PYTHON_USEDEP}]" \
201 # || has_version "dev-python/baz[${PYTHON_USEDEP}]"; }
209 # dev-lang/python:2.7
210 # dev-python/foo[python_targets_python2_7(-)?,python_single_target_python2_7(+)?]
211 # || ( dev-python/bar[python_targets_python2_7(-)?,python_single_target_python2_7(+)?]
212 # dev-python/baz[python_targets_python2_7(-)?,python_single_target_python2_7(+)?] )
215 # dev-lang/python:3.3
216 # dev-python/foo[python_targets_python3_3(-)?,python_single_target_python3_3(+)?]
217 # || ( dev-python/bar[python_targets_python3_3(-)?,python_single_target_python3_3(+)?]
218 # dev-python/baz[python_targets_python3_3(-)?,python_single_target_python3_3(+)?] )
222 python_gen_any_dep() {
223 debug-print-function ${FUNCNAME} "${@}"
226 [[ ${depstr} ]] || die "No dependency string provided"
228 local i PYTHON_PKG_DEP out=
229 for i in "${_PYTHON_SUPPORTED_IMPLS[@]}"; do
230 local PYTHON_USEDEP="python_targets_${i}(-),python_single_target_${i}(+)"
231 python_export "${i}" PYTHON_PKG_DEP
233 local i_depstr=${depstr//\$\{PYTHON_USEDEP\}/${PYTHON_USEDEP}}
234 # note: need to strip '=' slot operator for || deps
235 out="( ${PYTHON_PKG_DEP%=} ${i_depstr} ) ${out}"
240 # @FUNCTION: _python_EPYTHON_supported
244 # Check whether the specified implementation is supported by package
245 # (specified in PYTHON_COMPAT). Calls python_check_deps() if declared.
246 _python_EPYTHON_supported() {
247 debug-print-function ${FUNCNAME} "${@}"
250 local i=${EPYTHON/./_}
253 python*|jython*|pypy*)
256 ewarn "Invalid EPYTHON: ${EPYTHON}"
261 if has "${i}" "${_PYTHON_SUPPORTED_IMPLS[@]}"; then
262 if python_is_installed "${i}"; then
263 if declare -f python_check_deps >/dev/null; then
264 local PYTHON_USEDEP="python_targets_${i}(-),python_single_target_${i}(+)"
271 elif ! has "${i}" "${_PYTHON_ALL_IMPLS[@]}"; then
272 ewarn "Invalid EPYTHON: ${EPYTHON}"
277 # @FUNCTION: python_setup
279 # Determine what the best installed (and supported) Python
280 # implementation is, and set the Python build environment up for it.
282 # This function will call python_check_deps() if defined.
284 debug-print-function ${FUNCNAME} "${@}"
286 # support developer override
287 if [[ ${PYTHON_COMPAT_OVERRIDE} ]]; then
288 local impls=( ${PYTHON_COMPAT_OVERRIDE} )
289 [[ ${#impls[@]} -eq 1 ]] || die "PYTHON_COMPAT_OVERRIDE must name exactly one implementation for python-any-r1"
291 ewarn "WARNING: PYTHON_COMPAT_OVERRIDE in effect. The following Python"
292 ewarn "implementation will be used:"
294 ewarn " ${PYTHON_COMPAT_OVERRIDE}"
296 ewarn "Dependencies won't be satisfied, and EPYTHON/eselect-python will be ignored."
298 python_export "${impls[0]}" EPYTHON PYTHON
303 # first, try ${EPYTHON}... maybe it's good enough for us.
304 if [[ ${EPYTHON} ]]; then
305 if _python_EPYTHON_supported "${EPYTHON}"; then
306 python_export EPYTHON PYTHON
312 # then, try eselect-python
314 for variant in '' '--python2' '--python3'; do
315 i=$(eselect python --show ${variant} 2>/dev/null)
317 if [[ ! ${i} ]]; then
320 elif _python_EPYTHON_supported "${i}"; then
321 python_export "${i}" EPYTHON PYTHON
327 # fallback to best installed impl.
328 # (reverse iteration over _PYTHON_SUPPORTED_IMPLS)
329 for (( i = ${#_PYTHON_SUPPORTED_IMPLS[@]} - 1; i >= 0; i-- )); do
330 python_export "${_PYTHON_SUPPORTED_IMPLS[i]}" EPYTHON PYTHON
331 if _python_EPYTHON_supported "${EPYTHON}"; then
337 eerror "No Python implementation found for the build. This is usually"
338 eerror "a bug in the ebuild. Please report it to bugs.gentoo.org"
339 eerror "along with the build log."
341 die "No supported Python implementation installed."
344 # @FUNCTION: python-any-r1_pkg_setup
346 # Runs python_setup during from-source installs.
348 # In a binary package installs is a no-op. If you need Python in pkg_*
349 # phases of a binary package, call python_setup directly.
350 python-any-r1_pkg_setup() {
351 debug-print-function ${FUNCNAME} "${@}"
353 [[ ${MERGE_TYPE} != binary ]] && python_setup