tool/ports: streamline hash tool usage

tool/ports/mk/check.mk

@@ -12,11 +12,6 @@
 
 check:
 
-#
-# Utility to check if a tool is installed
-#
-check_tool = $(if $(shell which $(1)),,$(error Need to have '$(1)' installed.))
-
 $(call check_tool,curl)
 $(call check_tool,git)
 $(call check_tool,svn)

tool/ports/mk/common.inc

@@ -7,7 +7,6 @@
 SHELL   := bash
 VERBOSE ?= @
 ECHO    := echo -e
-HASHSUM := sha1sum
 
 BRIGHT_COL  ?= \x1b[01;33m
 DARK_COL    ?= \x1b[00;33m
@@ -25,3 +24,8 @@ MSG_GIT        := $(MSG_PREFIX_TXT)git
 
 # Force stable sorting order
 export LC_COLLATE=C
+
+#
+# Utility to check if a tool is installed
+#
+check_tool = $(if $(shell which $(1)),,$(error Need to have '$(1)' installed.))

tool/ports/mk/hash.inc

@@ -15,6 +15,8 @@
 # STRICT_HASH to 'no', the MAKEFILE_LIST can be exluded.
 #
 
+$(call check_tool,sha1sum)
+
 _PATCHES_IN_REP_DIR := $(foreach P,$(PATCHES),\
                          $(wildcard $(REP_DIR)/$(subst $(REP_DIR)/,,$(P))))
 
@@ -25,7 +27,7 @@ endif
 
 $(_DST_HASH_FILE): $(HASH_INPUT) $(MAKEFILE_LIST)
 	@$(MSG_GENERATE)$(notdir $@)
-	$(VERBOSE)cat $(HASH_INPUT) | $(HASHSUM) | sed "s/ .*//" > $@
+	$(VERBOSE)cat $(HASH_INPUT) | sha1sum | sed "s/ .*//" > $@
 
 _check_hash: $(_DST_HASH_FILE)
 ifneq ($(CHECK_HASH),no)

tool/ports/mk/install.mk

@@ -20,11 +20,6 @@
 # XXX remove this line when the tool has stabilized
 STRICT_HASH ?= no
 
-#
-# Utility to check if a tool is installed
-#
-check_tool = $(if $(shell which $(1)),,$(error Need to have '$(1)' installed.))
-
 #
 # Utility to check if a python module is installed
 #
@@ -59,9 +54,7 @@ include $(GENODE_DIR)/tool/ports/mk/common.inc
 
 $(call check_tool,wget)
 $(call check_tool,patch)
-$(call check_tool,sha1sum)
 $(call check_tool,sha256sum)
-$(call check_tool,$(HASHSUM))
 
 #
 # Assertion for the presence of a LICENSE and VERSION declarations in the port