fix(driverkit/makefile): pass right archs to generate targets

Signed-off-by: Massimiliano Giovagnoli <me@maxgio.it>

driverkit/Makefile

@@ -5,16 +5,22 @@ ifeq ($(DRIVERKIT),)
 DRIVERKIT := "/bin/driverkit"
 endif
 
+ALL_ARCHS := x86_64 aarch64
+
 # Recursive wildcard
 rwildcard=$(foreach d,$(wildcard $(1:=/*)),$(call rwildcard,$d,$2) $(filter $(subst *,%,$2),$d))
 
+# Equals function
+eq = $(and $(findstring $(1),$(2)),$(findstring $(2),$(1)))
+
 CONFIGS := $(call rwildcard,config/*,*.yaml)
 VERSIONS := $(patsubst config/%,%,$(sort $(dir $(wildcard config/*/))))
 VERSIONS := $(VERSIONS:/=)
 TARGET_VERSION ?= *
 TARGET_DISTRO ?= *
 TARGET_KERNEL ?= *
 TARGET_ARCH ?= *
+TARGET_ARCHS := $(if $(call eq,$(TARGET_ARCH),*),$(ALL_ARCHS),$(TARGET_ARCH))
 TARGET_HEADERS ?=
 S3_DRIVERS_BUCKET ?= "falco-distribution"
 S3_DRIVERS_KEY_PREFIX ?= "driver"
@@ -45,13 +51,16 @@ publish: $(addprefix publish_,$(VERSIONS))
 publish_s3: $(addprefix publish_s3_,$(VERSIONS))
 
 generate:
-	$(foreach VERSION,$(VERSIONS),\
-		utils/generate -a $(TARGET_ARCH) -k ${TARGET_KERNEL} -d ${TARGET_DISTRO} -h ${TARGET_HEADERS} -v ${VERSION}; \
+	$(foreach ARCH,$(TARGET_ARCHS),\
+		$(foreach VERSION,$(VERSIONS),\
+			utils/generate -a '$(ARCH)' -k '${TARGET_KERNEL}' -d '${TARGET_DISTRO}' -h '${TARGET_HEADERS}' -v '${VERSION}'; \
+		)\
 	)
 
 generate/auto:
-	utils/scrape_and_generate "x86_64"
-	utils/scrape_and_generate "aarch64"
+	$(foreach ARCH,$(TARGET_ARCHS),\
+		utils/scrape_and_generate $(ARCH); \
+	)
 
 cleanup:
 	utils/cleanup -p ${BINTRAY_SECRET} $(addprefix -v ,$(VERSIONS))