openwrt/include/prereq.mk
Etienne Champetier 799de7c641 build: cleanup possibly dangling Python 3 host symlink
When switching from master branch to 19.07 or older, we need to ensure
that Python symlink in staging bin directory points to Python 2.

We can't rely completly just on SetupHostCommand as its executed only in
cases when the $(STAGING_DIR_HOST)/bin/python doesn't already exist, so
we need to remove it before running SetupHostCommand.

This is a cherry-pick of 3b68fb57c9
with python3 instead of python2

Signed-off-by: Petr Štetiar <ynezz@true.cz>
Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>
2019-11-09 08:21:45 +01:00

122 lines
2.7 KiB
Makefile

#
# Copyright (C) 2006-2015 OpenWrt.org
#
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
#
ifneq ($(__prereq_inc),1)
__prereq_inc:=1
prereq:
if [ -f $(TMP_DIR)/.prereq-error ]; then \
echo; \
cat $(TMP_DIR)/.prereq-error; \
rm -f $(TMP_DIR)/.prereq-error; \
echo; \
false; \
fi
.SILENT: prereq
endif
PREREQ_PREV=
# 1: display name
# 2: error message
define Require
export PREREQ_CHECK=1
ifeq ($$(CHECK_$(1)),)
prereq: prereq-$(1)
prereq-$(1): $(if $(PREREQ_PREV),prereq-$(PREREQ_PREV)) FORCE
printf "Checking '$(1)'... "
if $(NO_TRACE_MAKE) -f $(firstword $(MAKEFILE_LIST)) check-$(1) >/dev/null 2>/dev/null; then \
echo 'ok.'; \
else \
echo 'failed.'; \
echo "$(PKG_NAME): $(strip $(2))" >> $(TMP_DIR)/.prereq-error; \
fi
check-$(1): FORCE
$(call Require/$(1))
CHECK_$(1):=1
.SILENT: prereq-$(1) check-$(1)
.NOTPARALLEL:
endif
PREREQ_PREV=$(1)
endef
define RequireCommand
define Require/$(1)
which $(1)
endef
$$(eval $$(call Require,$(1),$(2)))
endef
define RequireHeader
define Require/$(1)
[ -e "$(1)" ]
endef
$$(eval $$(call Require,$(1),$(2)))
endef
define CleanupPython3
define Require/python3-cleanup
if [ -f "$(STAGING_DIR_HOST)/bin/python" ] && \
$(STAGING_DIR_HOST)/bin/python -V 2>&1 | \
grep -q 'Python 3'; then \
rm $(STAGING_DIR_HOST)/bin/python; \
fi
endef
$$(eval $$(call Require,python3-cleanup))
endef
define QuoteHostCommand
'$(subst ','"'"',$(strip $(1)))'
endef
# 1: display name
# 2: failure message
# 3: test
define TestHostCommand
define Require/$(1)
($(3)) >/dev/null 2>/dev/null
endef
$$(eval $$(call Require,$(1),$(2)))
endef
# 1: canonical name
# 2: failure message
# 3+: candidates
define SetupHostCommand
define Require/$(1)
[ -f "$(STAGING_DIR_HOST)/bin/$(strip $(1))" ] && exit 0; \
for cmd in $(call QuoteHostCommand,$(3)) $(call QuoteHostCommand,$(4)) \
$(call QuoteHostCommand,$(5)) $(call QuoteHostCommand,$(6)) \
$(call QuoteHostCommand,$(7)) $(call QuoteHostCommand,$(8)) \
$(call QuoteHostCommand,$(9)) $(call QuoteHostCommand,$(10)) \
$(call QuoteHostCommand,$(11)) $(call QuoteHostCommand,$(12)); do \
if [ -n "$$$$$$$$cmd" ]; then \
bin="$$$$$$$$(PATH="$(subst $(space),:,$(filter-out $(STAGING_DIR_HOST)/%,$(subst :,$(space),$(PATH))))" \
which "$$$$$$$${cmd%% *}")"; \
if [ -x "$$$$$$$$bin" ] && eval "$$$$$$$$cmd" >/dev/null 2>/dev/null; then \
mkdir -p "$(STAGING_DIR_HOST)/bin"; \
ln -sf "$$$$$$$$bin" "$(STAGING_DIR_HOST)/bin/$(strip $(1))"; \
exit 0; \
fi; \
fi; \
done; \
exit 1
endef
$$(eval $$(call Require,$(1),$(if $(2),$(2),Missing $(1) command)))
endef