include/prereq.mk

   1 # SPDX-License-Identifier: GPL-2.0-only
   2 #
   3 # Copyright (C) 2006-2020 OpenWrt.org
   4
   5 ifneq ($(__prereq_inc),1)
   6 __prereq_inc:=1
   7
   8 prereq:
   9         if [ -f $(TMP_DIR)/.prereq-error ]; then \
  10                 echo; \
  11                 cat $(TMP_DIR)/.prereq-error; \
  12                 rm -f $(TMP_DIR)/.prereq-error; \
  13                 echo; \
  14                 false; \
  15         fi
  16
  17 .SILENT: prereq
  18 endif
  19
  20 PREREQ_PREV=
  21
  22 # 1: display name
  23 # 2: error message
  24 define Require
  25   export PREREQ_CHECK=1
  26   ifeq ($$(CHECK_$(1)),)
  27     prereq: prereq-$(1)
  28
  29     prereq-$(1): $(if $(PREREQ_PREV),prereq-$(PREREQ_PREV)) FORCE
  30                 printf "Checking '$(1)'... "
  31                 if $(NO_TRACE_MAKE) -f $(firstword $(MAKEFILE_LIST)) check-$(1) >/dev/null 2>/dev/null; then \
  32                         echo 'ok.'; \
  33                 else \
  34                         echo 'failed.'; \
  35                         echo "$(PKG_NAME): $(strip $(2))" >> $(TMP_DIR)/.prereq-error; \
  36                 fi
  37
  38     check-$(1): FORCE
  39           $(call Require/$(1))
  40     CHECK_$(1):=1
  41
  42     .SILENT: prereq-$(1) check-$(1)
  43     .NOTPARALLEL:
  44   endif
  45
  46   PREREQ_PREV=$(1)
  47 endef
  48
  49
  50 define RequireCommand
  51   define Require/$(1)
  52     command -pv $(1)
  53   endef
  54
  55   $$(eval $$(call Require,$(1),$(2)))
  56 endef
  57
  58 define RequireHeader
  59   define Require/$(1)
  60     [ -e "$(1)" ]
  61   endef
  62
  63   $$(eval $$(call Require,$(1),$(2)))
  64 endef
  65
  66 define CleanupPython2
  67   define Require/python2-cleanup
  68         if [ -f "$(STAGING_DIR_HOST)/bin/python" ] && \
  69                 $(STAGING_DIR_HOST)/bin/python -V 2>&1 | \
  70                 grep -q 'Python 2'; then \
  71                         rm $(STAGING_DIR_HOST)/bin/python; \
  72         fi
  73   endef
  74
  75   $$(eval $$(call Require,python2-cleanup))
  76 endef
  77
  78 define QuoteHostCommand
  79 '$(subst ','"'"',$(strip $(1)))'
  80 endef
  81
  82 # 1: display name
  83 # 2: failure message
  84 # 3: test
  85 define TestHostCommand
  86   define Require/$(1)
  87         ($(3)) >/dev/null 2>/dev/null
  88   endef
  89
  90   $$(eval $$(call Require,$(1),$(2)))
  91 endef
  92
  93 # 1: canonical name
  94 # 2: failure message
  95 # 3+: candidates
  96 define SetupHostCommand
  97   define Require/$(1)
  98         [ -f "$(STAGING_DIR_HOST)/bin/$(strip $(1))" ] && exit 0; \
  99         for cmd in $(call QuoteHostCommand,$(3)) $(call QuoteHostCommand,$(4)) \
 100                    $(call QuoteHostCommand,$(5)) $(call QuoteHostCommand,$(6)) \
 101                    $(call QuoteHostCommand,$(7)) $(call QuoteHostCommand,$(8)) \
 102                    $(call QuoteHostCommand,$(9)) $(call QuoteHostCommand,$(10)) \
 103                    $(call QuoteHostCommand,$(11)) $(call QuoteHostCommand,$(12)); do \
 104                 if [ -n "$$$$$$$$cmd" ]; then \
 105                         bin="$$$$$$$$(PATH="$(subst $(space),:,$(filter-out $(STAGING_DIR_HOST)/%,$(subst :,$(space),$(PATH))))" \
 106                                 command -pv "$$$$$$$${cmd%% *}")"; \
 107                         if [ -x "$$$$$$$$bin" ] && eval "$$$$$$$$cmd" >/dev/null 2>/dev/null; then \
 108                                 mkdir -p "$(STAGING_DIR_HOST)/bin"; \
 109                                 ln -sf "$$$$$$$$bin" "$(STAGING_DIR_HOST)/bin/$(strip $(1))"; \
 110                                 exit 0; \
 111                         fi; \
 112                 fi; \
 113         done; \
 114         exit 1
 115   endef
 116
 117   $$(eval $$(call Require,$(1),$(if $(2),$(2),Missing $(1) command)))
 118 endef