[gentoo-python] [PATCH 2/2] Support python-exec:2.

["Michał Górny" <mgorny@gentoo.org>]

---
 gx86/eclass/distutils-r1.eclass     | 28 +++++++++++++++++----
 gx86/eclass/python-r1.eclass        | 38 +++++++++++++++++++++-------
 gx86/eclass/python-single-r1.eclass |  8 +++++-
 gx86/eclass/python-utils-r1.eclass  | 50 ++++++++++++++++++++++++++++++++++---
 4 files changed, 106 insertions(+), 18 deletions(-)

diff --git a/gx86/eclass/distutils-r1.eclass b/gx86/eclass/distutils-r1.eclass
index 985e707..e03e135 100644
--- a/gx86/eclass/distutils-r1.eclass
+++ b/gx86/eclass/distutils-r1.eclass
@@ -421,6 +421,10 @@ _distutils-r1_wrap_scripts() {
 	local path=${1}
 	[[ ${path} ]] || die "${FUNCNAME}: no path given"
 
+	if ! _python_want_python_exec2; then
+		local PYTHON_SCRIPTDIR=${EPREFIX}/usr/bin
+	fi
+
 	mkdir -p "${path}/usr/bin" || die
 	local f
 	while IFS= read -r -d '' f; do
@@ -432,15 +436,22 @@ _distutils-r1_wrap_scripts() {
 		if [[ ${shebang} == '#!'*${EPYTHON}* ]]; then
 			debug-print "${FUNCNAME}: matching shebang: ${shebang}"
 
-			local newf=${f%/*}/${basename}-${EPYTHON}
-			debug-print "${FUNCNAME}: renaming to ${newf#${path}}"
-			mv "${f}" "${newf}" || die
+			if ! _python_want_python_exec2; then
+				local newf=${f%/*}/${basename}-${EPYTHON}
+				debug-print "${FUNCNAME}: renaming to ${newf#${path}}"
+				mv "${f}" "${newf}" || die
+			fi
 
 			debug-print "${FUNCNAME}: installing wrapper at /usr/bin/${basename}"
-			_python_ln_rel "${path}${EPREFIX}"/usr/bin/python-exec \
+			_python_ln_rel "${path}${EPREFIX}"$(_python_get_wrapper_path) \
 				"${path}${EPREFIX}/usr/bin/${basename}" || die
+		elif _python_want_python_exec2; then
+			debug-print "${FUNCNAME}: non-matching shebang: ${shebang}"
+
+			debug-print "${FUNCNAME}: moving to /usr/bin/${basename}"
+			mv "${f}" "${ED%/}/usr/bin/${basename}" || die
 		fi
-	done < <(find "${path}/usr/bin" -type f -print0)
+	done < <(find "${path}${PYTHON_SCRIPTDIR}" -type f -print0)
 }
 
 # @FUNCTION: distutils-r1_python_install
@@ -475,6 +486,13 @@ distutils-r1_python_install() {
 	[[ ${DISTUTILS_SINGLE_IMPL} ]] && root=${D}
 	flags+=( --root="${root}" )
 
+	if [[ ! ${DISTUTILS_SINGLE_IMPL} ]] && _python_want_python_exec2
+	then
+		local PYTHON_SCRIPTDIR
+		python_export PYTHON_SCRIPTDIR
+		flags+=( --install-scripts="${PYTHON_SCRIPTDIR}" )
+	fi
+
 	esetup.py install "${flags[@]}" "${@}"
 
 	if [[ -d ${root}$(python_get_sitedir)/tests ]]; then
diff --git a/gx86/eclass/python-r1.eclass b/gx86/eclass/python-r1.eclass
index e006744..d80c7b6 100644
--- a/gx86/eclass/python-r1.eclass
+++ b/gx86/eclass/python-r1.eclass
@@ -122,7 +122,7 @@ fi
 #
 # Example value:
 # @CODE
-# dev-python/python-exec:0
+# dev-python/python-exec:=
 # python_targets_python2_6? ( dev-lang/python:2.6[gdbm] )
 # python_targets_python2_7? ( dev-lang/python:2.7[gdbm] )
 # @CODE
@@ -203,7 +203,13 @@ _python_set_globals() {
 	# but no point in making this overcomplex, BDEP doesn't hurt anyone
 	# 2) python-exec should be built with all targets forced anyway
 	# but if new targets were added, we may need to force a rebuild
-	PYTHON_DEPS+="dev-python/python-exec:0[${PYTHON_USEDEP}]"
+	# 3) use whichever python-exec slot installed in EAPI 5. For EAPI 4,
+	# just fix :0 for now since := deps are not supported.
+	if [[ ${EAPI} != 4 ]]; then
+		PYTHON_DEPS+="dev-python/python-exec:=[${PYTHON_USEDEP}]"
+	else
+		PYTHON_DEPS+="dev-python/python-exec:0[${PYTHON_USEDEP}]"
+	fi
 }
 _python_set_globals
 
@@ -742,12 +748,26 @@ python_replicate_script() {
 	debug-print-function ${FUNCNAME} "${@}"
 
 	_python_replicate_script() {
-		local f
-		for f in "${files[@]}"; do
-			cp -p "${f}" "${f}-${EPYTHON}" || die
-		done
-		_python_rewrite_shebang "${EPYTHON}" \
-			"${files[@]/%/-${EPYTHON}}"
+		if _python_want_python_exec2; then
+			local PYTHON_SCRIPTDIR
+			python_export PYTHON_SCRIPTDIR
+
+			(
+				exeinto "${PYTHON_SCRIPTDIR#${EPREFIX}}"
+				doexe "${files[@]}"
+			)
+
+			_python_rewrite_shebang "${EPYTHON}" \
+				"${files[@]/*\//${D%/}/${PYTHON_SCRIPTDIR}/}"
+		else
+			local f
+			for f in "${files[@]}"; do
+				cp -p "${f}" "${f}-${EPYTHON}" || die
+			done
+
+			_python_rewrite_shebang "${EPYTHON}" \
+				"${files[@]/%/-${EPYTHON}}"
+		fi
 	}
 
 	local files=( "${@}" )
@@ -756,7 +776,7 @@ python_replicate_script() {
 	# install the wrappers
 	local f
 	for f; do
-		_python_ln_rel "${ED%/}"/usr/bin/python-exec "${f}" || die
+		_python_ln_rel "${ED%/}$(_python_get_wrapper_path)" "${f}" || die
 	done
 }
 
diff --git a/gx86/eclass/python-single-r1.eclass b/gx86/eclass/python-single-r1.eclass
index 2b099c3..46786ea 100644
--- a/gx86/eclass/python-single-r1.eclass
+++ b/gx86/eclass/python-single-r1.eclass
@@ -193,7 +193,13 @@ _python_single_set_globals() {
 	# but no point in making this overcomplex, BDEP doesn't hurt anyone
 	# 2) python-exec should be built with all targets forced anyway
 	# but if new targets were added, we may need to force a rebuild
-	PYTHON_DEPS+="dev-python/python-exec:0[${PYTHON_USEDEP}]"
+	# 3) use whichever python-exec slot installed in EAPI 5. For EAPI 4,
+	# just fix :0 for now since := deps are not supported.
+	if [[ ${EAPI} != 4 ]]; then
+		PYTHON_DEPS+="dev-python/python-exec:=[${PYTHON_USEDEP}]"
+	else
+		PYTHON_DEPS+="dev-python/python-exec:0[${PYTHON_USEDEP}]"
+	fi
 }
 _python_single_set_globals
 
diff --git a/gx86/eclass/python-utils-r1.eclass b/gx86/eclass/python-utils-r1.eclass
index 6cf23f0..a15a3f3 100644
--- a/gx86/eclass/python-utils-r1.eclass
+++ b/gx86/eclass/python-utils-r1.eclass
@@ -607,7 +607,7 @@ _python_ln_rel() {
 			rel_path=../${rel_path}${frseg:+${frseg}/}
 		fi
 	done
-	rel_path+=${frpath}${1##*/}
+	rel_path+=${frpath}${from##*/}
 
 	debug-print "${FUNCNAME}: ${from} -> ${to}"
 	debug-print "${FUNCNAME}: rel_path = ${rel_path}"
@@ -756,20 +756,30 @@ python_newscript() {
 	[[ ${#} -eq 2 ]] || die "Usage: ${FUNCNAME} <path> <new-name>"
 
 	local d=${python_scriptroot:-${DESTTREE}/bin}
+	local wrapd=${d}
 
 	local f=${1}
 	local barefn=${2}
+	local newfn
 
-	local newfn=${barefn}-${EPYTHON}
+	if _python_want_python_exec2; then
+		local PYTHON_SCRIPTDIR
+		python_export PYTHON_SCRIPTDIR
+		d=${PYTHON_SCRIPTDIR#${EPREFIX}}
+		newfn=${barefn}
+	else
+		newfn=${barefn}-${EPYTHON}
+	fi
 
 	(
+		dodir "${wrapd}"
 		exeinto "${d}"
 		newexe "${f}" "${newfn}" || die
 	)
 	_python_rewrite_shebang "${ED%/}/${d}/${newfn}"
 
 	# install the wrapper
-	_python_ln_rel "${ED%/}"/usr/bin/python-exec \
+	_python_ln_rel "${ED%/}"$(_python_get_wrapper_path) \
 		"${ED%/}/${d}/${barefn}" || die
 }
 
@@ -985,5 +995,39 @@ python_is_python3() {
 	[[ ${impl} == python3* ]]
 }
 
+# @FUNCTION: _python_want_python_exec2
+# @INTERNAL
+# @DESCRIPTION:
+# Check whether we should be using python-exec:2.
+_python_want_python_exec2() {
+	debug-print-function ${FUNCNAME} "${@}"
+
+	# EAPI 4 lacks slot operators, so just fix it on python-exec:0.
+	[[ ${EAPI} == 4 ]] && return 1
+
+	# Check if we cached the result, or someone put an override.
+	if [[ ! ${_PYTHON_WANT_PYTHON_EXEC2+1} ]]; then
+		has_version 'dev-python/python-exec:2'
+		_PYTHON_WANT_PYTHON_EXEC2=$(( ! ${?} ))
+	fi
+
+	# Non-zero means 'yes', zero means 'no'.
+	[[ ${_PYTHON_WANT_PYTHON_EXEC2} != 0 ]]
+}
+
+# @FUNCTION: _python_get_wrapper_path
+# @INTERNAL
+# @DESCRIPTION:
+# Output path to proper python-exec slot.
+_python_get_wrapper_path() {
+	debug-print-function ${FUNCNAME} "${@}"
+
+	if _python_want_python_exec2; then
+		echo /usr/lib/python-exec/python-exec2
+	else
+		echo /usr/bin/python-exec
+	fi
+}
+
 _PYTHON_UTILS_R1=1
 fi
-- 
1.8.3.2