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modsign: Use if_changed rule for extracting cert from module signing key

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We couldn't use if_changed for this before, because it didn't live in
the kernel/ directory so we couldn't add it to $(targets). It was easier
just to leave it as it was.

Now it's in the certs/ directory we can use if_changed, the same as we
do for the trusted certificate list.

Aside from making things consistent, this means we don't need to depend
explicitly on the include/config/module/sig/key.h file. And we also get
to automatically do the right thing and re-extract the cert if the user
does odd things like using a relative filename and then playing silly
buggers with adding/removing that file in both the source and object
trees. We always favour the one in the object tree if it exists, and
now we'll correctly re-extract the cert when it changes. Previously we'd
*only* re-extract the cert if the config option changed, even if the
actual file we're using did change.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Woodhouse 2015-08-14 15:33:56 +01:00
parent cfc411e7ff
commit 62172c81f2
1 changed files with 3 additions and 2 deletions
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5
certs/Makefile
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@ -142,6 +142,7 @@ endif
# GCC PR#66871 again.
$(obj)/system_certificates.o: $(obj)/signing_key.x509
$(obj)/signing_key.x509: scripts/extract-cert include/config/module/sig/key.h $(X509_DEP)
$(call cmd,extract_certs,$(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY))
targets += signing_key.x509
$(obj)/signing_key.x509: scripts/extract-cert $(X509_DEP) FORCE
$(call if_changed,extract_certs,$(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY))
endif