Allow some images test-timestamp updates to fail

Normally (in other CI systems) we want to know immediately if updating
timestamps fails.  Otherwise an image could be pruned due to old-age
without anybody noticing.  However on this specific repository, it's
possible that not all images are actually built.  So it's necessary
to allow for some (possibly all) to fail.  However, this shouldn't
impact the testing of the `imgts` container & scripts in CI (here).

Signed-off-by: Chris Evich <[email protected]>

.cirrus.yml

@@ -247,6 +247,8 @@ imgts_task:
         cpu: 2
         memory: '2G'
     env:
+        # Not all $IMGNAMES may have been built, don't fail if some are missing
+        REQUIRE_ALL: 0  # This should ONLY be set `0` on this repository!
         BUILDID: "$CIRRUS_BUILD_ID"
         REPOREF: "$CIRRUS_REPO_NAME"
         GCPJSON: ENCRYPTED[112c55192dba9a7edd1889a7e704aa1e6ae40730b97ad8ebcbae2bb5f4ff84c7e9ca5b955baaf1f69e7b9e5c5a14a4d3]

imgts/entrypoint.sh

@@ -28,6 +28,9 @@ ARGS="
 [[ -n "$IMGNAMES" ]] || \
     die 1 "No \$IMGNAMES were specified."
 
+# Under some runtime conditions, not all images may be available
+REQUIRE_ALL=${REQUIRE_ALL:-1}
+
 # Don't allow one bad apple to ruin the whole batch
 ERRIMGS=''
 
@@ -53,5 +56,8 @@ do
     fi
 done
 
-[[ -z "$ERRIMGS" ]] || \
-    die 2 "ERROR: Failed to update one or more image timestamps: $ERRIMGS"
+if [[ -n "$ERRIMGS" ]]; then
+    die_or_warn=die
+    ((REQUIRE_ALL)) || die_or_warn=warn
+    $die_or_warn 2 "Failed to update one or more image timestamps: $ERRIMGS"
+fi

imgts/lib_entrypoint.sh

@@ -18,6 +18,15 @@ die() {
     exit "$EXIT"
 }
 
+# Similar to die() but it ignores the first parameter (exit code)
+# to allow direct use in place of an (otherwise) die() call.
+warn() {
+    IGNORE=$1
+    shift
+    MSG="$*"
+    echo -e "${RED}WARNING: $MSG${NOR}"
+}
+
 # Hilight messages not coming from a shell command
 msg() {
     echo -e "${YEL}${1:-NoMessageGiven}${NOR}"