Cirrus: Print images that should be pruned

Over time unless they're removed, the project could grow quite a large
collection of VM images.  While generally cheap (less than a penny each,
per month), these will become a significant cost item if not kept
in-check.

Add a specialized container for handling image-pruning, but limit
it to only finding and printing (not actually deleting) images.

Also update the image-building workflow so that base-images used to
compose cache-images are also labeled with metadata.

N/B: As an additional safeguard, the service account which
     executes the new container in production *DOES NOT*
     have access to delete images.  This can be enabled
     by adding the GCE IAM role: CustomComputeImagePrune

Signed-off-by: Chris Evich <cevich@redhat.com>

1 files changed, 12 insertions, 35 deletions

diff --git a/contrib/imgts/entrypoint.sh b/contrib/imgts/entrypoint.sh
index 610e1f3b6..9c653eda0 100755
--- a/contrib/imgts/entrypoint.sh
+++ b/contrib/imgts/entrypoint.sh
@@ -2,45 +2,22 @@
 
 set -e
 
-RED="\e[1;36;41m"
-YEL="\e[1;33;44m"
-NOR="\e[0m"
+source /usr/local/bin/lib_entrypoint.sh
 
-die() {
-    echo -e "$2" >&2
-    exit "$1"
-}
+req_env_var GCPJSON GCPNAME GCPPROJECT IMGNAMES BUILDID REPOREF
 
-SENTINEL="__unknown__"  # default set in dockerfile
+gcloud_init
 
-[[ "$GCPJSON" != "$SENTINEL" ]] || \
-    die 1 "Must specify service account JSON in \$GCPJSON"
-[[ "$GCPNAME" != "$SENTINEL" ]] || \
-    die 2 "Must specify service account name in \$GCPNAME"
-[[ "$GCPPROJECT" != "$SENTINEL" ]] || \
-    die 4 "Must specify GCP Project ID in \$GCPPROJECT"
-[[ -n "$GCPPROJECT" ]] || \
-    die 5 "Must specify non-empty GCP Project ID in \$GCPPROJECT"
-[[ "$IMGNAMES" != "$SENTINEL" ]] || \
-    die 6 "Must specify space separated list of GCE image names in \$IMGNAMES"
-[[ "$BUILDID" != "$SENTINEL" ]] || \
-    die 7 "Must specify the number of current build in \$BUILDID"
-[[ "$REPOREF" != "$SENTINEL" ]] || \
-    die 8 "Must specify a PR number or Branch name in \$REPOREF"
+ARGS="
+    --update-labels=last-used=$(date +%s)
+    --update-labels=build-id=$BUILDID
+    --update-labels=repo-ref=$REPOREF
+    --update-labels=project=$GCPPROJECT
+"
 
-ARGS="--update-labels=last-used=$(date +%s)"
-# optional
-[[ -z "$BUILDID" ]] || ARGS="$ARGS --update-labels=build-id=$BUILDID"
-[[ -z "$REPOREF" ]] || ARGS="$ARGS --update-labels=repo-ref=$REPOREF"
-[[ -z "$GCPPROJECT" ]] || ARGS="$ARGS --update-labels=project=$GCPPROJECT"
-
-gcloud config set account "$GCPNAME"
-gcloud config set project "$GCPPROJECT"
-echo "$GCPJSON" > /tmp/gcp.json
-gcloud auth activate-service-account --key-file=/tmp/gcp.json || rm /tmp/gcp.json
 for image in $IMGNAMES
 do
-    gcloud compute images update "$image" $ARGS &
+    $GCLOUD compute images update "$image" $ARGS &
 done
-set +e  # Actual update failures are only warnings
-wait || die 0 "${RED}WARNING:$NOR ${YEL}Failed to update labels on one or more images:$NOR '$IMGNAMES'"
+
+wait || echo "Warning: No \$IMGNAMES were specified."