1 # Copyright 1999-2020 Gentoo Authors
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: 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 Python Guide:
37 # https://dev.gentoo.org/~mgorny/python-guide/
40 [0-4]) die "Unsupported EAPI=${EAPI:-0} (too old) for ${ECLASS}" ;;
42 *) die "Unsupported EAPI=${EAPI} (unknown) for ${ECLASS}" ;;
45 if [[ ! ${_PYTHON_ANY_R1} ]]; then
47 if [[ ${_PYTHON_R1} ]]; then
48 die 'python-any-r1.eclass can not be used with python-r1.eclass.'
49 elif [[ ${_PYTHON_SINGLE_R1} ]]; then
50 die 'python-any-r1.eclass can not be used with python-single-r1.eclass.'
53 inherit python-utils-r1
57 EXPORT_FUNCTIONS pkg_setup
59 # @ECLASS-VARIABLE: PYTHON_COMPAT
62 # This variable contains a list of Python implementations the package
63 # supports. It must be set before the `inherit' call. It has to be
68 # PYTHON_COMPAT=( python{2_5,2_6,2_7} )
71 # @ECLASS-VARIABLE: PYTHON_COMPAT_OVERRIDE
74 # This variable can be used when working with ebuilds to override
75 # the in-ebuild PYTHON_COMPAT. It is a string naming the implementation
76 # which will be used to build the package. It needs to be specified
77 # in the calling environment, and not in ebuilds.
79 # It should be noted that in order to preserve metadata immutability,
80 # PYTHON_COMPAT_OVERRIDE does not affect dependencies. The value of
81 # EPYTHON and eselect-python preferences are ignored. Dependencies need
82 # to be satisfied manually.
86 # PYTHON_COMPAT_OVERRIDE='pypy' emerge -1v dev-python/bar
89 # @ECLASS-VARIABLE: PYTHON_REQ_USE
92 # The list of USEflags required to be enabled on the Python
93 # implementations, formed as a USE-dependency string. It should be valid
94 # for all implementations in PYTHON_COMPAT, so it may be necessary to
99 # PYTHON_REQ_USE="gdbm,ncurses(-)?"
102 # It will cause the Python dependencies to look like:
104 # || ( dev-lang/python:X.Y[gdbm,ncurses(-)?] ... )
107 # @ECLASS-VARIABLE: PYTHON_DEPS
109 # This is an eclass-generated Python dependency string for all
110 # implementations listed in PYTHON_COMPAT.
112 # Any of the supported interpreters will satisfy the dependency.
122 # || ( dev-lang/python:2.7[gdbm]
123 # dev-lang/python:2.6[gdbm] )
126 # @ECLASS-VARIABLE: PYTHON_USEDEP
128 # An eclass-generated USE-dependency string for the currently tested
129 # implementation. It is set locally for python_check_deps() call.
131 # The generate USE-flag list is compatible with packages using python-r1,
132 # python-single-r1 and python-distutils-ng eclasses. It must not be used
133 # on packages using python.eclass.
137 # python_check_deps() {
138 # has_version "dev-python/foo[${PYTHON_USEDEP}]"
144 # python_targets_python2_7(-)?,python_single_target_python2_7(+)?
147 _python_any_set_globals() {
148 local usestr deps i PYTHON_PKG_DEP
149 [[ ${PYTHON_REQ_USE} ]] && usestr="[${PYTHON_REQ_USE}]"
153 for i in "${_PYTHON_SUPPORTED_IMPLS[@]}"; do
154 _python_export "${i}" PYTHON_PKG_DEP
156 # note: need to strip '=' slot operator for || deps
157 deps="${PYTHON_PKG_DEP/:0=/:0} ${deps}"
161 if [[ ${PYTHON_DEPS+1} ]]; then
162 if [[ ${PYTHON_DEPS} != "${deps}" ]]; then
163 eerror "PYTHON_DEPS have changed between inherits (PYTHON_REQ_USE?)!"
164 eerror "Before: ${PYTHON_DEPS}"
165 eerror "Now : ${deps}"
166 die "PYTHON_DEPS integrity check failed"
173 if [[ ! ${PYTHON_REQUIRED_USE+1} ]]; then
174 # fake var to catch mistaken usage
175 PYTHON_REQUIRED_USE='I-DO-NOT-EXIST-IN-PYTHON-ANY-R1'
176 readonly PYTHON_REQUIRED_USE
179 _python_any_set_globals
180 unset -f _python_any_set_globals
182 if [[ ! ${_PYTHON_ANY_R1} ]]; then
184 # @FUNCTION: python_gen_any_dep
185 # @USAGE: <dependency-block>
187 # Generate an any-of dependency that enforces a version match between
188 # the Python interpreter and Python packages. <dependency-block> needs
189 # to list one or more dependencies with verbatim '${PYTHON_USEDEP}'
190 # references (quoted!) that will get expanded inside the function.
192 # This should be used along with an appropriate python_check_deps()
193 # that checks which of the any-of blocks were matched.
197 # DEPEND="$(python_gen_any_dep '
198 # dev-python/foo[${PYTHON_USEDEP}]
199 # || ( dev-python/bar[${PYTHON_USEDEP}]
200 # dev-python/baz[${PYTHON_USEDEP}] )')"
202 # python_check_deps() {
203 # has_version "dev-python/foo[${PYTHON_USEDEP}]" \
204 # && { has_version "dev-python/bar[${PYTHON_USEDEP}]" \
205 # || has_version "dev-python/baz[${PYTHON_USEDEP}]"; }
213 # dev-lang/python:2.7
214 # dev-python/foo[python_targets_python2_7(-)?,python_single_target_python2_7(+)?]
215 # || ( dev-python/bar[python_targets_python2_7(-)?,python_single_target_python2_7(+)?]
216 # dev-python/baz[python_targets_python2_7(-)?,python_single_target_python2_7(+)?] )
219 # dev-lang/python:3.3
220 # dev-python/foo[python_targets_python3_3(-)?,python_single_target_python3_3(+)?]
221 # || ( dev-python/bar[python_targets_python3_3(-)?,python_single_target_python3_3(+)?]
222 # dev-python/baz[python_targets_python3_3(-)?,python_single_target_python3_3(+)?] )
226 python_gen_any_dep() {
227 debug-print-function ${FUNCNAME} "${@}"
230 [[ ${depstr} ]] || die "No dependency string provided"
232 local i PYTHON_PKG_DEP out=
233 for i in "${_PYTHON_SUPPORTED_IMPLS[@]}"; do
234 local PYTHON_USEDEP="python_targets_${i}(-),python_single_target_${i}(+)"
235 _python_export "${i}" PYTHON_PKG_DEP
237 local i_depstr=${depstr//\$\{PYTHON_USEDEP\}/${PYTHON_USEDEP}}
238 # note: need to strip '=' slot operator for || deps
239 out="( ${PYTHON_PKG_DEP%=} ${i_depstr} ) ${out}"
244 # @FUNCTION: _python_EPYTHON_supported
248 # Check whether the specified implementation is supported by package
249 # (specified in PYTHON_COMPAT). Calls python_check_deps() if declared.
250 _python_EPYTHON_supported() {
251 debug-print-function ${FUNCNAME} "${@}"
254 local i=${EPYTHON/./_}
257 python*|jython*|pypy*)
260 ewarn "Invalid EPYTHON: ${EPYTHON}"
265 if has "${i}" "${_PYTHON_SUPPORTED_IMPLS[@]}"; then
266 if python_is_installed "${i}"; then
267 if declare -f python_check_deps >/dev/null; then
268 local PYTHON_USEDEP="python_targets_${i}(-),python_single_target_${i}(+)"
275 elif ! has "${i}" "${_PYTHON_ALL_IMPLS[@]}"; then
276 ewarn "Invalid EPYTHON: ${EPYTHON}"
281 # @FUNCTION: python_setup
283 # Determine what the best installed (and supported) Python
284 # implementation is, and set the Python build environment up for it.
286 # This function will call python_check_deps() if defined.
288 debug-print-function ${FUNCNAME} "${@}"
290 # support developer override
291 if [[ ${PYTHON_COMPAT_OVERRIDE} ]]; then
292 local impls=( ${PYTHON_COMPAT_OVERRIDE} )
293 [[ ${#impls[@]} -eq 1 ]] || die "PYTHON_COMPAT_OVERRIDE must name exactly one implementation for python-any-r1"
295 ewarn "WARNING: PYTHON_COMPAT_OVERRIDE in effect. The following Python"
296 ewarn "implementation will be used:"
298 ewarn " ${PYTHON_COMPAT_OVERRIDE}"
300 ewarn "Dependencies won't be satisfied, and EPYTHON/eselect-python will be ignored."
302 _python_export "${impls[0]}" EPYTHON PYTHON
303 _python_wrapper_setup
304 einfo "Using ${EPYTHON} to build"
308 # first, try ${EPYTHON}... maybe it's good enough for us.
309 if [[ ${EPYTHON} ]]; then
310 if _python_EPYTHON_supported "${EPYTHON}"; then
311 _python_export EPYTHON PYTHON
312 _python_wrapper_setup
313 einfo "Using ${EPYTHON} to build"
318 # then, try eselect-python
320 for variant in '' '--python2' '--python3'; do
321 i=$(eselect python --show ${variant} 2>/dev/null)
323 if [[ ! ${i} ]]; then
326 elif _python_EPYTHON_supported "${i}"; then
327 _python_export "${i}" EPYTHON PYTHON
328 _python_wrapper_setup
329 einfo "Using ${EPYTHON} to build"
334 # fallback to best installed impl.
335 # (reverse iteration over _PYTHON_SUPPORTED_IMPLS)
336 for (( i = ${#_PYTHON_SUPPORTED_IMPLS[@]} - 1; i >= 0; i-- )); do
337 _python_export "${_PYTHON_SUPPORTED_IMPLS[i]}" EPYTHON PYTHON
338 if _python_EPYTHON_supported "${EPYTHON}"; then
339 _python_wrapper_setup
340 einfo "Using ${EPYTHON} to build"
345 eerror "No Python implementation found for the build. This is usually"
346 eerror "a bug in the ebuild. Please report it to bugs.gentoo.org"
347 eerror "along with the build log."
349 die "No supported Python implementation installed."
352 # @FUNCTION: python-any-r1_pkg_setup
354 # Runs python_setup during from-source installs.
356 # In a binary package installs is a no-op. If you need Python in pkg_*
357 # phases of a binary package, call python_setup directly.
358 python-any-r1_pkg_setup() {
359 debug-print-function ${FUNCNAME} "${@}"
361 [[ ${MERGE_TYPE} != binary ]] && python_setup