osx: use bdist_mpkg.script_bdist_mpkg module instead of bdist_mpkg command

It seems like a default installation of bdist_mpkg makes it available as
Python module, but the corresponding executable is placed in a location like
/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/bin which is
not in $PATH and thus not directly available. 'make osx' would thus fail.

Instead, skip the bdist_mpkg executable and invoke it as a Python module. That
works out of the box here.

Makefile

@@ -1,203 +1,203 b''
 # If you want to change PREFIX, do not just edit it below. The changed
 # value wont get passed on to recursive make calls. You should instead
 # override the variable on the command like:
 #
 # % make PREFIX=/opt/ install
 
 PREFIX=/usr/local
 export PREFIX
 PYTHON=python
 PURE=
 PYFILES:=$(shell find mercurial hgext doc -name '*.py')
 DOCFILES=mercurial/help/*.txt
 export LANGUAGE=C
 export LC_ALL=C
 
 # Set this to e.g. "mingw32" to use a non-default compiler.
 COMPILER=
 
 help:
 	@echo 'Commonly used make targets:'
 	@echo '  all          - build program and documentation'
 	@echo '  install      - install program and man pages to $$PREFIX ($(PREFIX))'
 	@echo '  install-home - install with setup.py install --home=$$HOME ($(HOME))'
 	@echo '  local        - build for inplace usage'
 	@echo '  tests        - run all tests in the automatic test suite'
 	@echo '  test-foo     - run only specified tests (e.g. test-merge1.t)'
 	@echo '  dist         - run all tests and create a source tarball in dist/'
 	@echo '  clean        - remove files created by other targets'
 	@echo '                 (except installed files or dist source tarball)'
 	@echo '  update-pot   - update i18n/hg.pot'
 	@echo
 	@echo 'Example for a system-wide installation under /usr/local:'
 	@echo '  make all && su -c "make install" && hg version'
 	@echo
 	@echo 'Example for a local installation (usable in this directory):'
 	@echo '  make local && ./hg version'
 
 all: build doc
 
 local:
 	$(PYTHON) setup.py $(PURE) \
 	  build_py -c -d . \
 	  build_ext $(COMPILER:%=-c %) -i \
 	  build_hgexe $(COMPILER:%=-c %) -i \
 	  build_mo
 	env HGRCPATH= $(PYTHON) hg version
 
 build:
 	$(PYTHON) setup.py $(PURE) build $(COMPILER:%=-c %)
 
 doc:
 	$(MAKE) -C doc
 
 clean:
 	-$(PYTHON) setup.py clean --all # ignore errors from this command
 	find contrib doc hgext i18n mercurial tests \
 		\( -name '*.py[cdo]' -o -name '*.so' \) -exec rm -f '{}' ';'
 	rm -f $(addprefix mercurial/,$(notdir $(wildcard mercurial/pure/[a-z]*.py)))
 	rm -f MANIFEST MANIFEST.in hgext/__index__.py tests/*.err
 	if test -d .hg; then rm -f mercurial/__version__.py; fi
 	rm -rf build mercurial/locale
 	$(MAKE) -C doc clean
 
 install: install-bin install-doc
 
 install-bin: build
 	$(PYTHON) setup.py $(PURE) install --root="$(DESTDIR)/" --prefix="$(PREFIX)" --force
 
 install-doc: doc
 	cd doc && $(MAKE) $(MFLAGS) install
 
 install-home: install-home-bin install-home-doc
 
 install-home-bin: build
 	$(PYTHON) setup.py $(PURE) install --home="$(HOME)" --prefix="" --force
 
 install-home-doc: doc
 	cd doc && $(MAKE) $(MFLAGS) PREFIX="$(HOME)" install
 
 MANIFEST-doc:
 	$(MAKE) -C doc MANIFEST
 
 MANIFEST.in: MANIFEST-doc
 	hg manifest | sed -e 's/^/include /' > MANIFEST.in
 	echo include mercurial/__version__.py >> MANIFEST.in
 	sed -e 's/^/include /' < doc/MANIFEST >> MANIFEST.in
 
 dist:	tests dist-notests
 
 dist-notests:	doc MANIFEST.in
 	TAR_OPTIONS="--owner=root --group=root --mode=u+w,go-w,a+rX-s" $(PYTHON) setup.py -q sdist
 
 check: tests
 
 tests:
 	cd tests && $(PYTHON) run-tests.py $(TESTFLAGS)
 
 test-%:
 	cd tests && $(PYTHON) run-tests.py $(TESTFLAGS) $@
 
 check-code:
 	hg manifest | xargs python contrib/check-code.py
 
 update-pot: i18n/hg.pot
 
 i18n/hg.pot: $(PYFILES) $(DOCFILES) i18n/posplit i18n/hggettext
 	$(PYTHON) i18n/hggettext mercurial/commands.py \
 	  hgext/*.py hgext/*/__init__.py \
 	  mercurial/fileset.py mercurial/revset.py \
 	  mercurial/templatefilters.py mercurial/templatekw.py \
 	  mercurial/filemerge.py \
 	  $(DOCFILES) > i18n/hg.pot.tmp
         # All strings marked for translation in Mercurial contain
         # ASCII characters only. But some files contain string
         # literals like this '\037\213'. xgettext thinks it has to
         # parse them even though they are not marked for translation.
         # Extracting with an explicit encoding of ISO-8859-1 will make
         # xgettext "parse" and ignore them.
 	echo $(PYFILES) | xargs \
 	  xgettext --package-name "Mercurial" \
 	  --msgid-bugs-address "<[e-mail]>" \
 	  --copyright-holder "Matt Mackall <[e-mail]> and others" \
 	  --from-code ISO-8859-1 --join --sort-by-file --add-comments=i18n: \
 	  -d hg -p i18n -o hg.pot.tmp
 	$(PYTHON) i18n/posplit i18n/hg.pot.tmp
         # The target file is not created before the last step. So it never is in
         # an intermediate state.
 	mv -f i18n/hg.pot.tmp i18n/hg.pot
 
 %.po: i18n/hg.pot
         # work on a temporary copy for never having a half completed target
 	cp $@ $@.tmp
 	msgmerge --no-location --update $@.tmp $^
 	mv -f $@.tmp $@
 
 # Packaging targets
 
 osx:
-	@which bdist_mpkg >/dev/null || \
+	python -c 'import bdist_mpkg.script_bdist_mpkg' || \
 	   (echo "Missing bdist_mpkg (easy_install bdist_mpkg)"; false)
 	rm -rf dist/mercurial-*.mpkg
-	bdist_mpkg setup.py --
+	python -m bdist_mpkg.script_bdist_mpkg setup.py --
 	mkdir -p packages/osx
 	N=`cd dist && echo mercurial-*.mpkg | sed 's,\.mpkg$$,,'` && hdiutil create -srcfolder dist/$$N.mpkg/ -scrub -volname "$$N" -ov packages/osx/$$N.dmg
 	rm -rf dist/mercurial-*.mpkg
 
 fedora20:
 	mkdir -p packages/fedora20
 	contrib/buildrpm
 	cp rpmbuild/RPMS/*/* packages/fedora20
 	cp rpmbuild/SRPMS/* packages/fedora20
 	rm -rf rpmbuild
 
 docker-fedora20:
 	mkdir -p packages/fedora20
 	contrib/dockerrpm fedora20
 
 fedora21:
 	mkdir -p packages/fedora21
 	contrib/buildrpm
 	cp rpmbuild/RPMS/*/* packages/fedora21
 	cp rpmbuild/SRPMS/* packages/fedora21
 	rm -rf rpmbuild
 
 docker-fedora21:
 	mkdir -p packages/fedora21
 	contrib/dockerrpm fedora21
 
 centos5:
 	mkdir -p packages/centos5
 	contrib/buildrpm --withpython
 	cp rpmbuild/RPMS/*/* packages/centos5
 	cp rpmbuild/SRPMS/* packages/centos5
 
 docker-centos5:
 	mkdir -p packages/centos5
 	contrib/dockerrpm centos5 --withpython
 
 centos6:
 	mkdir -p packages/centos6
 	contrib/buildrpm
 	cp rpmbuild/RPMS/*/* packages/centos6
 	cp rpmbuild/SRPMS/* packages/centos6
 
 docker-centos6:
 	mkdir -p packages/centos6
 	contrib/dockerrpm centos6
 
 centos7:
 	mkdir -p packages/centos7
 	contrib/buildrpm
 	cp rpmbuild/RPMS/*/* packages/centos7
 	cp rpmbuild/SRPMS/* packages/centos7
 
 docker-centos7:
 	mkdir -p packages/centos7
 	contrib/dockerrpm centos7
 
 .PHONY: help all local build doc clean install install-bin install-doc \
 	install-home install-home-bin install-home-doc \
 	dist dist-notests check tests check-code update-pot \
 	osx fedora20 docker-fedora20 fedora21 docker-fedora21 \
 	centos5 docker-centos5 centos6 docker-centos6 centos7 docker-centos7