1 # Copyright 1999-2020 Gentoo Authors
2 # Distributed under the terms of the GNU General Public License v2
4 # @ECLASS: python-single-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 Python packages not installed for multiple implementations.
13 # An extension of the python-r1 eclass suite for packages which
14 # don't support being installed for multiple Python implementations.
15 # This mostly includes tools embedding Python and packages using foreign
18 # This eclass sets correct IUSE. It also provides PYTHON_DEPS
19 # and PYTHON_REQUIRED_USE that need to be added to appropriate ebuild
22 # The eclass exports PYTHON_SINGLE_USEDEP that is suitable for depending
23 # on other packages using the eclass. Dependencies on packages using
24 # python-r1 should be created via python_gen_cond_dep() function,
25 # using PYTHON_USEDEP placeholder.
27 # Please note that packages support multiple Python implementations
28 # (using python-r1 eclass) can not depend on packages not supporting
29 # them (using this eclass).
31 # Please note that python-single-r1 will always inherit python-utils-r1
32 # as well. Thus, all the functions defined there can be used
33 # in the packages using python-single-r1, and there is no need ever
36 # For more information, please see the Python Guide:
37 # https://dev.gentoo.org/~mgorny/python-guide/
41 die "Unsupported EAPI=${EAPI:-0} (too old) for ${ECLASS}"
44 # EAPI=5 is required for sane USE_EXPAND dependencies
47 die "Unsupported EAPI=${EAPI} (unknown) for ${ECLASS}"
51 if [[ ! ${_PYTHON_SINGLE_R1} ]]; then
53 if [[ ${_PYTHON_R1} ]]; then
54 die 'python-single-r1.eclass can not be used with python-r1.eclass.'
55 elif [[ ${_PYTHON_ANY_R1} ]]; then
56 die 'python-single-r1.eclass can not be used with python-any-r1.eclass.'
59 inherit python-utils-r1
63 EXPORT_FUNCTIONS pkg_setup
65 # @ECLASS-VARIABLE: PYTHON_COMPAT
68 # This variable contains a list of Python implementations the package
69 # supports. It must be set before the `inherit' call. It has to be
74 # PYTHON_COMPAT=( python2_7 python3_3 python3_4 )
77 # Please note that you can also use bash brace expansion if you like:
79 # PYTHON_COMPAT=( python2_7 python3_{3,4} )
82 # @ECLASS-VARIABLE: PYTHON_COMPAT_OVERRIDE
85 # This variable can be used when working with ebuilds to override
86 # the in-ebuild PYTHON_COMPAT. It is a string naming the implementation
87 # which package will be built for. It needs to be specified
88 # in the calling environment, and not in ebuilds.
90 # It should be noted that in order to preserve metadata immutability,
91 # PYTHON_COMPAT_OVERRIDE does not affect IUSE nor dependencies.
92 # The state of PYTHON_SINGLE_TARGET is ignored, and the implementation
93 # in PYTHON_COMPAT_OVERRIDE is built instead. Dependencies need to be
98 # PYTHON_COMPAT_OVERRIDE='pypy' emerge -1v dev-python/bar
101 # @ECLASS-VARIABLE: PYTHON_REQ_USE
104 # The list of USEflags required to be enabled on the chosen Python
105 # implementations, formed as a USE-dependency string. It should be valid
106 # for all implementations in PYTHON_COMPAT, so it may be necessary to
109 # This should be set before calling `inherit'.
113 # PYTHON_REQ_USE="gdbm,ncurses(-)?"
116 # It will cause the Python dependencies to look like:
118 # python_single_target_pythonX_Y? ( dev-lang/python:X.Y[gdbm,ncurses(-)?] )
121 # @ECLASS-VARIABLE: PYTHON_DEPS
123 # This is an eclass-generated Python dependency string for all
124 # implementations listed in PYTHON_COMPAT.
126 # The dependency string is conditional on PYTHON_SINGLE_TARGET.
130 # RDEPEND="${PYTHON_DEPS}
132 # DEPEND="${RDEPEND}"
137 # dev-lang/python-exec:=
138 # python_single_target_python2_7? ( dev-lang/python:2.7[gdbm] )
139 # python_single_target_pypy? ( dev-python/pypy[gdbm] )
142 # @ECLASS-VARIABLE: PYTHON_SINGLE_USEDEP
144 # This is an eclass-generated USE-dependency string which can be used to
145 # depend on another python-single-r1 package being built for the same
146 # Python implementations.
148 # If you need to depend on a multi-impl (python-r1) package, use
149 # python_gen_cond_dep with PYTHON_USEDEP placeholder instead.
153 # RDEPEND="dev-python/foo[${PYTHON_SINGLE_USEDEP}]"
158 # python_single_target_python3_4(-)?
161 # @ECLASS-VARIABLE: PYTHON_USEDEP
163 # This is a placeholder variable supported by python_gen_cond_dep,
164 # in order to depend on python-r1 packages built for the same Python
169 # RDEPEND="$(python_gen_cond_dep '
170 # dev-python/foo[${PYTHON_USEDEP}]
176 # python_targets_python3_4(-)
179 # @ECLASS-VARIABLE: PYTHON_MULTI_USEDEP
181 # This is a backwards-compatibility placeholder. Use PYTHON_USEDEP
184 # @ECLASS-VARIABLE: PYTHON_REQUIRED_USE
186 # This is an eclass-generated required-use expression which ensures
187 # that exactly one PYTHON_SINGLE_TARGET value has been enabled.
189 # This expression should be utilized in an ebuild by including it in
190 # REQUIRED_USE, optionally behind a use flag.
194 # REQUIRED_USE="python? ( ${PYTHON_REQUIRED_USE} )"
199 # ^^ ( python_single_target_python2_7 python_single_target_python3_3 )
202 _python_single_set_globals() {
205 local flags=( "${_PYTHON_SUPPORTED_IMPLS[@]/#/python_single_target_}" )
207 if [[ ${#_PYTHON_SUPPORTED_IMPLS[@]} -eq 1 ]]; then
208 # if only one implementation is supported, use IUSE defaults
209 # to avoid requesting the user to enable it
215 local requse="^^ ( ${flags[*]} )"
216 local single_flags="${flags[@]/%/(-)?}"
217 local single_usedep=${single_flags// /,}
219 local deps= i PYTHON_PKG_DEP
220 for i in "${_PYTHON_SUPPORTED_IMPLS[@]}"; do
221 _python_export "${i}" PYTHON_PKG_DEP
222 # 1) well, python-exec would suffice as an RDEP
223 # but no point in making this overcomplex, BDEP doesn't hurt anyone
224 # 2) python-exec should be built with all targets forced anyway
225 # but if new targets were added, we may need to force a rebuild
226 deps+="python_single_target_${i}? (
228 >=dev-lang/python-exec-2:=[python_targets_${i}]
232 if [[ ${PYTHON_DEPS+1} ]]; then
233 if [[ ${PYTHON_DEPS} != "${deps}" ]]; then
234 eerror "PYTHON_DEPS have changed between inherits (PYTHON_REQ_USE?)!"
235 eerror "Before: ${PYTHON_DEPS}"
236 eerror "Now : ${deps}"
237 die "PYTHON_DEPS integrity check failed"
240 # these two are formality -- they depend on PYTHON_COMPAT only
241 if [[ ${PYTHON_REQUIRED_USE} != ${requse} ]]; then
242 eerror "PYTHON_REQUIRED_USE have changed between inherits!"
243 eerror "Before: ${PYTHON_REQUIRED_USE}"
244 eerror "Now : ${requse}"
245 die "PYTHON_REQUIRED_USE integrity check failed"
248 if [[ ${PYTHON_SINGLE_USEDEP} != "${single_usedep}" ]]; then
249 eerror "PYTHON_SINGLE_USEDEP have changed between inherits!"
250 eerror "Before: ${PYTHON_SINGLE_USEDEP}"
251 eerror "Now : ${single_usedep}"
252 die "PYTHON_SINGLE_USEDEP integrity check failed"
256 PYTHON_REQUIRED_USE=${requse}
257 PYTHON_USEDEP='%PYTHON_USEDEP-NEEDS-TO-BE-USED-IN-PYTHON_GEN_COND_DEP%'
258 PYTHON_SINGLE_USEDEP=${single_usedep}
259 readonly PYTHON_DEPS PYTHON_REQUIRED_USE PYTHON_SINGLE_USEDEP \
263 _python_single_set_globals
264 unset -f _python_single_set_globals
266 if [[ ! ${_PYTHON_SINGLE_R1} ]]; then
268 # @FUNCTION: _python_gen_usedep
270 # @USAGE: [<pattern>...]
272 # Output a USE dependency string for Python implementations which
273 # are both in PYTHON_COMPAT and match any of the patterns passed
274 # as parameters to the function.
276 # The patterns can be either fnmatch-style patterns (matched via bash
277 # == operator against PYTHON_COMPAT values) or '-2' / '-3' to indicate
278 # appropriately all enabled Python 2/3 implementations (alike
279 # python_is_python3). Remember to escape or quote the fnmatch patterns
280 # to prevent accidental shell filename expansion.
282 # This is an internal function used to implement python_gen_cond_dep.
283 _python_gen_usedep() {
284 debug-print-function ${FUNCNAME} "${@}"
286 local impl matches=()
288 for impl in "${_PYTHON_SUPPORTED_IMPLS[@]}"; do
289 if _python_impl_matches "${impl}" "${@}"; then
291 "python_single_target_${impl}(-)?"
296 [[ ${matches[@]} ]] || die "No supported implementations match python_gen_usedep patterns: ${@}"
298 local out=${matches[@]}
302 # @FUNCTION: python_gen_useflags
303 # @USAGE: [<pattern>...]
305 # Output a list of USE flags for Python implementations which
306 # are both in PYTHON_COMPAT and match any of the patterns passed
307 # as parameters to the function.
309 # The patterns can be either fnmatch-style patterns (matched via bash
310 # == operator against PYTHON_COMPAT values) or '-2' / '-3' to indicate
311 # appropriately all enabled Python 2/3 implementations (alike
312 # python_is_python3). Remember to escape or quote the fnmatch patterns
313 # to prevent accidental shell filename expansion.
317 # PYTHON_COMPAT=( python{2_7,3_4} )
318 # REQUIRED_USE="doc? ( ^^ ( $(python_gen_useflags 'python2*') ) )"
321 # It will cause the variable to look like:
323 # REQUIRED_USE="doc? ( ^^ ( python_single_target_python2_7 ) )"
325 python_gen_useflags() {
326 debug-print-function ${FUNCNAME} "${@}"
328 local impl matches=()
330 for impl in "${_PYTHON_SUPPORTED_IMPLS[@]}"; do
331 if _python_impl_matches "${impl}" "${@}"; then
332 matches+=( "python_single_target_${impl}" )
339 # @FUNCTION: python_gen_cond_dep
340 # @USAGE: <dependency> [<pattern>...]
342 # Output a list of <dependency>-ies made conditional to USE flags
343 # of Python implementations which are both in PYTHON_COMPAT and match
344 # any of the patterns passed as the remaining parameters.
346 # The patterns can be either fnmatch-style patterns (matched via bash
347 # == operator against PYTHON_COMPAT values) or '-2' / '-3' to indicate
348 # appropriately all enabled Python 2/3 implementations (alike
349 # python_is_python3). Remember to escape or quote the fnmatch patterns
350 # to prevent accidental shell filename expansion.
352 # In order to enforce USE constraints on the packages, verbatim
353 # '${PYTHON_SINGLE_USEDEP}' and '${PYTHON_USEDEP}' (quoted!) may
354 # be placed in the dependency specification. It will get expanded within
355 # the function into a proper USE dependency string.
359 # PYTHON_COMPAT=( python{2_7,3_{3,4}} pypy )
360 # RDEPEND="$(python_gen_cond_dep \
361 # 'dev-python/unittest2[${PYTHON_USEDEP}]' python2_7 pypy )"
364 # It will cause the variable to look like:
366 # RDEPEND="python_single_target_python2_7? (
367 # dev-python/unittest2[python_targets_python2_7(-)?,...] )
368 # python_single_target_pypy? (
369 # dev-python/unittest2[python_targets_pypy(-)?,...] )"
371 python_gen_cond_dep() {
372 debug-print-function ${FUNCNAME} "${@}"
374 local impl matches=()
379 for impl in "${_PYTHON_SUPPORTED_IMPLS[@]}"; do
380 if _python_impl_matches "${impl}" "${@}"; then
381 # substitute ${PYTHON_SINGLE_USEDEP} if used
382 # (since python_gen_usedep() will not return
383 # ${PYTHON_SINGLE_USEDEP}, the code is run at most once)
384 if [[ ${dep} == *'${PYTHON_SINGLE_USEDEP}'* ]]; then
385 local usedep=$(_python_gen_usedep "${@}")
386 dep=${dep//\$\{PYTHON_SINGLE_USEDEP\}/${usedep}}
388 local multi_usedep="python_targets_${impl}(-)"
390 local subdep=${dep//\$\{PYTHON_MULTI_USEDEP\}/${multi_usedep}}
391 matches+=( "python_single_target_${impl}? (
392 ${subdep//\$\{PYTHON_USEDEP\}/${multi_usedep}} )" )
399 # @FUNCTION: python_gen_impl_dep
400 # @USAGE: [<requested-use-flags> [<impl-pattern>...]]
402 # Output a dependency on Python implementations with the specified USE
403 # dependency string appended, or no USE dependency string if called
404 # without the argument (or with empty argument). If any implementation
405 # patterns are passed, the output dependencies will be generated only
406 # for the implementations matching them.
408 # The patterns can be either fnmatch-style patterns (matched via bash
409 # == operator against PYTHON_COMPAT values) or '-2' / '-3' to indicate
410 # appropriately all enabled Python 2/3 implementations (alike
411 # python_is_python3). Remember to escape or quote the fnmatch patterns
412 # to prevent accidental shell filename expansion.
414 # Use this function when you need to request different USE flags
415 # on the Python interpreter depending on package's USE flags. If you
416 # only need a single set of interpreter USE flags, just set
417 # PYTHON_REQ_USE and use ${PYTHON_DEPS} globally.
421 # PYTHON_COMPAT=( python{2_7,3_{3,4}} pypy )
422 # RDEPEND="foo? ( $(python_gen_impl_dep 'xml(+)') )"
425 # It will cause the variable to look like:
428 # python_single_target_python2_7? (
429 # dev-lang/python:2.7[xml(+)] )
430 # python_single_target_pypy? (
431 # dev-python/pypy[xml(+)] ) )"
433 python_gen_impl_dep() {
434 debug-print-function ${FUNCNAME} "${@}"
439 local PYTHON_REQ_USE=${1}
442 for impl in "${_PYTHON_SUPPORTED_IMPLS[@]}"; do
443 if _python_impl_matches "${impl}" "${@}"; then
445 _python_export "${impl}" PYTHON_PKG_DEP
446 matches+=( "python_single_target_${impl}? ( ${PYTHON_PKG_DEP} )" )
453 # @FUNCTION: python_setup
455 # Determine what the selected Python implementation is and set
456 # the Python build environment up for it.
458 debug-print-function ${FUNCNAME} "${@}"
462 # support developer override
463 if [[ ${PYTHON_COMPAT_OVERRIDE} ]]; then
464 local impls=( ${PYTHON_COMPAT_OVERRIDE} )
465 [[ ${#impls[@]} -eq 1 ]] || die "PYTHON_COMPAT_OVERRIDE must name exactly one implementation for python-single-r1"
467 ewarn "WARNING: PYTHON_COMPAT_OVERRIDE in effect. The following Python"
468 ewarn "implementation will be used:"
470 ewarn " ${PYTHON_COMPAT_OVERRIDE}"
472 ewarn "Dependencies won't be satisfied, and PYTHON_SINGLE_TARGET flags will be ignored."
474 _python_export "${impls[0]}" EPYTHON PYTHON
475 _python_wrapper_setup
476 einfo "Using ${EPYTHON} to build"
481 for impl in "${_PYTHON_SUPPORTED_IMPLS[@]}"; do
482 if use "python_single_target_${impl}"; then
483 if [[ ${EPYTHON} ]]; then
484 eerror "Your PYTHON_SINGLE_TARGET setting lists more than a single Python"
485 eerror "implementation. Please set it to just one value. If you need"
486 eerror "to override the value for a single package, please use package.env"
487 eerror "or an equivalent solution (man 5 portage)."
489 die "More than one implementation in PYTHON_SINGLE_TARGET."
492 _python_export "${impl}" EPYTHON PYTHON
493 _python_wrapper_setup
494 einfo "Using ${EPYTHON} to build"
498 if [[ ! ${EPYTHON} ]]; then
499 eerror "No Python implementation selected for the build. Please set"
500 eerror "the PYTHON_SINGLE_TARGET variable in your make.conf to one"
501 eerror "of the following values:"
503 eerror "${_PYTHON_SUPPORTED_IMPLS[@]}"
505 die "No supported Python implementation in PYTHON_SINGLE_TARGET."
509 # @FUNCTION: python-single-r1_pkg_setup
512 python-single-r1_pkg_setup() {
513 debug-print-function ${FUNCNAME} "${@}"
515 [[ ${MERGE_TYPE} != binary ]] && python_setup