Correctly evaluate UPDATE_CLOUD_IMAGE

While trying to get a clean packer build on an AWS based Jenkins I kept
running into the packer job failing. Digging into the code and turning
on debugging allowed me to spot that

if [[ ${UPDATE_CLOUD_IMAGE} ]]; then

Was translating to

[[ -n false ]]

During runs where $UPDATE_CLOUD_IMAGE wasn't set. This seemed strange to
me and then looking a bit further I realized that the boolean variable
in Jenkins is converting to a string ENV var of either 'true' or 'false'
depending the set. This means for the if statement to properly execute
it must evaluate as a string comparison as the variable is not actually
a boolean.

Change-Id: Ie98b51eb22412705c8c264b61be3c76b4e5ff985
Issue: RELENG-2985
Signed-off-by: Andrew Grimberg <agrimberg@linuxfoundation.org>

diff --git a/releasenotes/notes/fix_packer_build-3d4cc3519be3c2a7.yaml b/releasenotes/notes/fix_packer_build-3d4cc3519be3c2a7.yaml
new file mode 100644 (file)
index 0000000..6f78acb
--- /dev/null
+++ b/releasenotes/notes/fix_packer_build-3d4cc3519be3c2a7.yaml
@@ -0,0 +1,9 @@
+---
+fixes:
+  - |
+    The packer merge job has a boolean option that sets an UPDATE_CLOUD_IMAGE
+    variable. This variable was always evaluating to true which caused issues
+    with builds always executing the section of the build. This causes problems
+    for builds that do not produce information that is expected by the section
+    of code. In specific AWS / EC2 builds fail as the build engine outputs
+    different name data than expected. The variable is now properly evaluated.

diff --git a/shell/packer-build.sh b/shell/packer-build.sh
index 3349a72..1a44e4f 100644 (file)
--- a/shell/packer-build.sh
+++ b/shell/packer-build.sh
@@ -68,7 +68,7 @@ packer.io build -color=false \
     "templates/$PACKER_TEMPLATE.json"
 
 # Extract image name from log and store value in the downstream job
-if [[ ${UPDATE_CLOUD_IMAGE} ]]; then
+if [[ ${UPDATE_CLOUD_IMAGE} == 'true' ]]; then
 
     NEW_IMAGE_NAME=$(grep -P '(\s+.*image: )(ZZCI\s+.*\d+-\d+\.\d+)' \
                           "$PACKER_BUILD_LOG" | awk -F': ' '{print $4}')