KEYS: Have make canonicalise the paths of the X.509 certs better to deduplicate
Have make canonicalise the paths of the X.509 certificates before we sort them
as this allows $(sort) to better remove duplicates.
Signed-off-by: David Howells <dhowells@redhat.com>
diff --git a/kernel/Makefile b/kernel/Makefile
index c34e5f9..2c24195 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -144,13 +144,19 @@
ifeq ($(CONFIG_MODULE_SIG),y)
###############################################################################
#
-# Roll all the X.509 certificates that we can find together and pull
-# them into the kernel.
+# Roll all the X.509 certificates that we can find together and pull them into
+# the kernel.
+#
+# We look in the source root and the build root for all files whose name ends
+# in ".x509". Unfortunately, this will generate duplicate filenames, so we
+# have make canonicalise the pathnames and then sort them to discard the
+# duplicates.
#
###############################################################################
X509_CERTIFICATES-y := $(wildcard *.x509) $(wildcard $(srctree)/*.x509)
X509_CERTIFICATES-$(CONFIG_MODULE_SIG) += signing_key.x509
-X509_CERTIFICATES := $(sort $(X509_CERTIFICATES-y))
+X509_CERTIFICATES := $(sort $(foreach CERT,$(X509_CERTIFICATES-y), \
+ $(or $(realpath $(CERT)),$(CERT))))
ifeq ($(X509_CERTIFICATES),)
$(warning *** No X.509 certificates found ***)