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Add option to run deploy only if image update available #7

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Add option to run deploy only if image update available #7

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31 changes: 31 additions & 0 deletions docker-rollout
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@ set -e
# Defaults
HEALTHCHECK_TIMEOUT=60
NO_HEALTHCHECK_TIMEOUT=10
UPDATE_ONLY=false

# Print metadata for Docker CLI plugin
if [[ "$1" == "docker-cli-plugin-metadata" ]]; then
Expand Down Expand Up @@ -42,6 +43,7 @@ Options:
-h, --help Print usage
-f, --file FILE Compose configuration files
-t, --timeout N Healthcheck timeout (default: $HEALTHCHECK_TIMEOUT seconds)
-u, --update-only Deploy will only be done if image update is available
-w, --wait N When no healthcheck is defined, wait for N seconds before
stopping old container (default: $NO_HEALTHCHECK_TIMEOUT seconds)
EOF
Expand Down Expand Up @@ -71,7 +73,32 @@ scale() {
$COMPOSE_COMMAND $COMPOSE_FILES up --detach --scale "$service=$replicas" --no-recreate "$service"
}

checkForUpdates() {
if ! command -v jq > /dev/null 2>&1; then
echo "jq is required for update-only"
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@skauk skauk Jan 15, 2024

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Would be great to not depend on jq

exit 1
fi

image_name=$(docker ps --filter "label=com.docker.compose.service=$SERVICE" --format "{{.Image}}")
container_id=$(docker ps --filter "label=com.docker.compose.service=$SERVICE" --format "{{.ID}}")

old_image_id=$(docker inspect --format='{{.Image}}' "$container_id")
new_image_id=$(docker manifest inspect "$image_name" | jq -r '.config.digest')
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@skauk skauk Jan 15, 2024

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To loose dependency on jq this line should be:

new_image_id=$(docker inspect "$image_name" --format "{{.Id}}")


if [ "$old_image_id" != "$new_image_id" ] ; then
echo "=> Updating image for '$image_name' as it is outdated"
docker pull "$image_name"
else
echo "=> Image already up-to-date"
exit 0
fi
}

main() {
if $UPDATE_ONLY; then
checkForUpdates
fi

OLD_CONTAINER_ID=$(docker ps --filter "label=com.docker.compose.service=$SERVICE" --format "{{.ID}}")

if [[ "$OLD_CONTAINER_ID" == "" ]]; then
Expand Down Expand Up @@ -137,6 +164,10 @@ while [[ $# -gt 0 ]]; do
NO_HEALTHCHECK_TIMEOUT="$2"
shift 2
;;
-u | --update-only)
UPDATE_ONLY=true
shift
;;
-*)
echo "Unknown option: $1"
exit_with_usage
Expand Down