systemd: fix empty file list with sed

If measured-uki support is not enabled or build is continuing
from previous stages, then the matching file list can be empty.
Fixes build failure where sed says no input files.

Signed-off-by: Mikko Rapeli <mikko.rapeli@linaro.org>
Signed-off-by: Armin Kuster <akuster808@gmail.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/meta-tpm/recipes-core/systemd/systemd_%.bbappend b/meta-tpm/recipes-core/systemd/systemd_%.bbappend
index 82b79ba..867c111 100644
--- a/meta-tpm/recipes-core/systemd/systemd_%.bbappend
+++ b/meta-tpm/recipes-core/systemd/systemd_%.bbappend
@@ -11,7 +11,10 @@ PACKAGECONFIG:append = " \
 # TODO: use swtpm-native to calculate TPM measurements
 do_install:append() {
     if "${@bb.utils.contains('DISTRO_FEATURES', 'tpm2', 'true', 'false', d)}"; then
-        sed -i -e "s/^ConditionSecurity=measured-uki/ConditionSecurity=tpm2/g" \
-            $( grep -rl ^ConditionSecurity=measured-uki ${D} )
+        FILES=$( grep -rl ^ConditionSecurity=measured-uki ${D} || true )
+        if [ "$FILES" != "" ]; then
+            sed -i -e "s/^ConditionSecurity=measured-uki/ConditionSecurity=tpm2/g" \
+                $FILES
+        fi
     fi
 }