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-rw-r--r--scripts/mk/vendor.mk43
1 files changed, 43 insertions, 0 deletions
diff --git a/scripts/mk/vendor.mk b/scripts/mk/vendor.mk
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+++ b/scripts/mk/vendor.mk
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+# This Makefile fragment (since dpkg 1.16.1) defines the following
+# vendor-related variables:
+#
+# DEB_VENDOR: output of «dpkg-vendor --query Vendor».
+# DEB_PARENT_VENDOR: output of «dpkg-vendor --query Parent» (can be empty).
+#
+# This Makefile fragment also defines a set of "dpkg_vendor_derives_from"
+# macros that can be used to verify if the current vendor derives from
+# another vendor. The unversioned variant defaults to the v0 version if
+# undefined, which can be defined explicitly to one of the versions or the
+# versioned macros can be used directly. The following are example usages:
+#
+# - dpkg_vendor_derives_from (since dpkg 1.16.1)
+#
+# ifeq ($(shell $(call dpkg_vendor_derives_from,ubuntu)),yes)
+# ...
+# endif
+#
+# - dpkg_vendor_derives_from_v0 (since dpkg 1.19.3)
+#
+# ifeq ($(shell $(call dpkg_vendor_derives_from_v0,ubuntu)),yes)
+# ...
+# endif
+#
+# - dpkg_vendor_derives_from_v1 (since dpkg 1.19.3)
+#
+# dpkg_vendor_derives_from = $(dpkg_vendor_derives_from_v1)
+# ifeq ($(call dpkg_vendor_derives_from,ubuntu),yes)
+# ...
+# endif
+# ifeq ($(call dpkg_vendor_derives_from_v1,ubuntu),yes)
+# ...
+# endif
+
+dpkg_late_eval ?= $(or $(value DPKG_CACHE_$(1)),$(eval DPKG_CACHE_$(1) := $(shell $(2)))$(value DPKG_CACHE_$(1)))
+
+DEB_VENDOR = $(call dpkg_late_eval,DEB_VENDOR,dpkg-vendor --query Vendor)
+DEB_PARENT_VENDOR = $(call dpkg_late_eval,DEB_PARENT_VENDOR,dpkg-vendor --query Parent)
+
+dpkg_vendor_derives_from_v0 = dpkg-vendor --derives-from $(1) && echo yes || echo no
+dpkg_vendor_derives_from_v1 = $(shell $(dpkg_vendor_derives_from_v0))
+
+dpkg_vendor_derives_from ?= $(dpkg_vendor_derives_from_v0)