[PATCH] meta/recipes-kernel/linux-module: Allow use of external scripts to sign modules

["'Cetin, Gokhan' via isar-users" <isar-users@googlegroups.com>]

This facilitates the integration of scripts developed for signing solutions like HSM
where private keys are not accessible and allows the use of detached signatures
produced by such solutions.

Signed-off-by: Gokhan Cetin <gokhan.cetin@siemens.com>
---
 meta/recipes-kernel/linux-module/files/debian/rules.tmpl | 4 ++++
 meta/recipes-kernel/linux-module/module.inc              | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/meta/recipes-kernel/linux-module/files/debian/rules.tmpl b/meta/recipes-kernel/linux-module/files/debian/rules.tmpl
index ad743437..30d7ce0f 100755
--- a/meta/recipes-kernel/linux-module/files/debian/rules.tmpl
+++ b/meta/recipes-kernel/linux-module/files/debian/rules.tmpl
@@ -56,6 +56,10 @@ endif
 ifneq ($(filter pkg.sign,$(DEB_BUILD_PROFILES)),)
 	find . -name "*.ko" -print -exec $(KDIR)/scripts/sign-file ${SIGNATURE_HASHFN} ${SIGNATURE_KEYFILE} ${SIGNATURE_CERTFILE} {} \;
 endif
+ifneq ($(filter pkg.signwith,$(DEB_BUILD_PROFILES)),)
+	find . -name "*.ko" | xargs -i ${SIGNATURE_SIGNWITH} {} {}.signature ${SIGNATURE_HASHFN} ${SIGNATURE_CERTFILE}
+	find . -name "*.ko" | xargs -i $(KDIR)/scripts/sign-file -s {}.signature ${SIGNATURE_HASHFN} ${SIGNATURE_CERTFILE} {}
+endif
 
 override_dh_auto_install:
 	$(MAKE) -C $(KDIR) M=${MODULE_DIR} INSTALL_MOD_PATH=$(PWD)/debian/${PN} modules_install
diff --git a/meta/recipes-kernel/linux-module/module.inc b/meta/recipes-kernel/linux-module/module.inc
index 3e8e5e7a..d7432bf7 100644
--- a/meta/recipes-kernel/linux-module/module.inc
+++ b/meta/recipes-kernel/linux-module/module.inc
@@ -25,6 +25,7 @@ DEB_BUILD_OPTIONS += "noautodbgsym"
 SIGNATURE_KEYFILE ??= ""
 SIGNATURE_CERTFILE ??= ""
 SIGNATURE_HASHFN ??= "sha256"
+SIGNATURE_SIGNWITH ??= ""
 
 SRC_URI += "file://debian/"
 
@@ -57,6 +58,7 @@ TEMPLATE_VARS += " \
     SIGNATURE_KEYFILE \
     SIGNATURE_CERTFILE \
     SIGNATURE_HASHFN \
+    SIGNATURE_SIGNWITH \
     PN \
     DEBIAN_COMPAT"
 
-- 
2.39.2

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