Update docker-rollout for SH

docker-rollout

@@ -1,26 +1,26 @@
-#!/bin/bash
+#!/bin/sh
 set -e
 
 # Defaults
 HEALTHCHECK_TIMEOUT=60
 NO_HEALTHCHECK_TIMEOUT=10
 
 # Print metadata for Docker CLI plugin
-if [[ "$1" == "docker-cli-plugin-metadata" ]]; then
+if [ "$1" = "docker-cli-plugin-metadata" ]; then
   cat <<EOF
 {
   "SchemaVersion": "0.1.0",
   "Vendor": "Karol Musur",
-  "Version": "v0.7",
+  "Version": "v0.8",
   "ShortDescription": "Rollout new Compose service version"
 }
 EOF
   exit
 fi
 
 # Save docker arguments, i.e. arguments before "rollout"
-while [[ $# -gt 0 ]]; do
-  if [[ "$1" == "rollout" ]]; then
+while [ $# -gt 0 ]; do
+  if [ "$1" = "rollout" ]; then
     shift
     break
   fi
@@ -64,66 +64,49 @@ exit_with_usage() {
 }
 
 healthcheck() {
-  local container_id="$1"
-
   # shellcheck disable=SC2086 # DOCKER_ARGS must be unquoted to allow multiple arguments
-  if docker $DOCKER_ARGS inspect --format='{{json .State.Health.Status}}' "$container_id" | grep -v "unhealthy" | grep -q "healthy"; then
-    return 0
-  fi
-
-  return 1
+  docker $DOCKER_ARGS inspect --format='{{json .State.Health.Status}}' "$1" | grep -v "unhealthy" | grep -q "healthy"
 }
 
 scale() {
-  local service="$1"
-  local replicas="$2"
-
   # shellcheck disable=SC2086 # COMPOSE_FILES and ENV_FILES must be unquoted to allow multiple files
-  $COMPOSE_COMMAND $COMPOSE_FILES $ENV_FILES up --detach --scale "$service=$replicas" --no-recreate "$service"
+  $COMPOSE_COMMAND $COMPOSE_FILES $ENV_FILES up --detach --scale "$1=$2" --no-recreate "$1"
 }
 
 main() {
   # shellcheck disable=SC2086 # COMPOSE_FILES and ENV_FILES must be unquoted to allow multiple files
-  if [[ "$($COMPOSE_COMMAND $COMPOSE_FILES $ENV_FILES ps --quiet "$SERVICE")" == "" ]]; then
+  if [ -z "$($COMPOSE_COMMAND $COMPOSE_FILES $ENV_FILES ps --quiet "$SERVICE")" ]; then
     echo "==> Service '$SERVICE' is not running. Starting the service."
     $COMPOSE_COMMAND $COMPOSE_FILES $ENV_FILES up --detach --no-recreate "$SERVICE"
     exit 0
   fi
 
   # shellcheck disable=SC2086 # COMPOSE_FILES and ENV_FILES must be unquoted to allow multiple files
-  OLD_CONTAINER_IDS_STRING=$($COMPOSE_COMMAND $COMPOSE_FILES $ENV_FILES ps --quiet "$SERVICE")
-  OLD_CONTAINER_IDS=()
-  for container_id in $OLD_CONTAINER_IDS_STRING; do
-    OLD_CONTAINER_IDS+=("$container_id")
-  done
-
-  SCALE=${#OLD_CONTAINER_IDS[@]}
+  OLD_CONTAINER_IDS_STRING=$($COMPOSE_COMMAND $COMPOSE_FILES $ENV_FILES ps --quiet "$SERVICE" | tr '\n' '|' | sed 's/|$//')
+  OLD_CONTAINER_IDS=$(echo "$OLD_CONTAINER_IDS_STRING" | tr '|' ' ')
+  SCALE=$(echo "$OLD_CONTAINER_IDS" | wc -w | tr -d ' ')
   SCALE_TIMES_TWO=$((SCALE * 2))
   echo "==> Scaling '$SERVICE' to '$SCALE_TIMES_TWO' instances"
   scale "$SERVICE" $SCALE_TIMES_TWO
 
   # Create a variable that contains the IDs of the new containers, but not the old ones
   # shellcheck disable=SC2086 # COMPOSE_FILES and ENV_FILES must be unquoted to allow multiple files
-  NEW_CONTAINER_IDS_STRING=$($COMPOSE_COMMAND $COMPOSE_FILES $ENV_FILES ps --quiet "$SERVICE" | grep --invert-match --file <(echo "$OLD_CONTAINER_IDS_STRING"))
-  NEW_CONTAINER_IDS=()
-  for container_id in $NEW_CONTAINER_IDS_STRING; do
-    NEW_CONTAINER_IDS+=("$container_id")
-  done
+  NEW_CONTAINER_IDS=$($COMPOSE_COMMAND $COMPOSE_FILES $ENV_FILES ps --quiet "$SERVICE" | grep -Ev "$OLD_CONTAINER_IDS_STRING" | tr '\n' ' ')
 
   # Check if first container has healthcheck
   # shellcheck disable=SC2086 # DOCKER_ARGS must be unquoted to allow multiple arguments
-  if docker $DOCKER_ARGS inspect --format='{{json .State.Health}}' "${OLD_CONTAINER_IDS[0]}" | grep --quiet "Status"; then
+  if docker $DOCKER_ARGS inspect --format='{{json .State.Health}}' "$(echo $OLD_CONTAINER_IDS | cut -f 1 -w)" | grep -q "Status"; then
     echo "==> Waiting for new containers to be healthy (timeout: $HEALTHCHECK_TIMEOUT seconds)"
     for _ in $(seq 1 "$HEALTHCHECK_TIMEOUT"); do
       SUCCESS=0
 
-      for NEW_CONTAINER_ID in "${NEW_CONTAINER_IDS[@]}"; do
+      for NEW_CONTAINER_ID in $NEW_CONTAINER_IDS; do
         if healthcheck "$NEW_CONTAINER_ID"; then
           SUCCESS=$((SUCCESS + 1))
         fi
       done
 
-      if [[ "$SUCCESS" == "$SCALE" ]]; then
+      if [ "$SUCCESS" = "$SCALE" ]; then
         break
       fi
 
@@ -132,21 +115,17 @@ main() {
 
     SUCCESS=0
 
-    for NEW_CONTAINER_ID in "${NEW_CONTAINER_IDS[@]}"; do
+    for NEW_CONTAINER_ID in $NEW_CONTAINER_IDS; do
       if healthcheck "$NEW_CONTAINER_ID"; then
         SUCCESS=$((SUCCESS + 1))
       fi
     done
 
-    if [[ "$SUCCESS" != "$SCALE" ]]; then
+    if [ "$SUCCESS" != "$SCALE" ]; then
       echo "==> New containers are not healthy. Rolling back." >&2
 
-      for NEW_CONTAINER_ID in "${NEW_CONTAINER_IDS[@]}"; do
-        # shellcheck disable=SC2086 # DOCKER_ARGS must be unquoted to allow multiple arguments
-        docker $DOCKER_ARGS stop "$NEW_CONTAINER_ID"
-        # shellcheck disable=SC2086 # DOCKER_ARGS must be unquoted to allow multiple arguments
-        docker $DOCKER_ARGS rm "$NEW_CONTAINER_ID"
-      done
+      docker $DOCKER_ARGS stop $NEW_CONTAINER_IDS
+      docker $DOCKER_ARGS rm $NEW_CONTAINER_IDS
 
       exit 1
     fi
@@ -155,17 +134,15 @@ main() {
     sleep "$NO_HEALTHCHECK_TIMEOUT"
   fi
 
-  echo "==> Stopping old containers"
+  echo "==> Stopping and removing old containers"
 
-  for OLD_CONTAINER_ID in "${OLD_CONTAINER_IDS[@]}"; do
-    # shellcheck disable=SC2086 # DOCKER_ARGS must be unquoted to allow multiple arguments
-    docker $DOCKER_ARGS stop "$OLD_CONTAINER_ID"
-    # shellcheck disable=SC2086 # DOCKER_ARGS must be unquoted to allow multiple arguments
-    docker $DOCKER_ARGS rm "$OLD_CONTAINER_ID"
-  done
+  # shellcheck disable=SC2086 # DOCKER_ARGS and OLD_CONTAINER_IDS must be unquoted to allow multiple arguments
+  docker $DOCKER_ARGS stop $OLD_CONTAINER_IDS
+  # shellcheck disable=SC2086 # DOCKER_ARGS and OLD_CONTAINER_IDS must be unquoted to allow multiple arguments
+  docker $DOCKER_ARGS rm $OLD_CONTAINER_IDS
 }
 
-while [[ $# -gt 0 ]]; do
+while [ $# -gt 0 ]; do
   case "$1" in
   -h | --help)
     usage
@@ -192,9 +169,11 @@ while [[ $# -gt 0 ]]; do
     exit_with_usage
     ;;
   *)
-    if [[ -n "$SERVICE" ]]; then
+    if [ -n "$SERVICE" ]; then
       echo "SERVICE is already set to '$SERVICE'"
-      exit_with_usage
+	  if [ "$SERVICE" != "$1" ]; then
+        exit_with_usage
+	  fi
     fi
 
     SERVICE="$1"
@@ -204,7 +183,7 @@ while [[ $# -gt 0 ]]; do
 done
 
 # Require SERVICE argument
-if [[ -z "$SERVICE" ]]; then
+if [ -z "$SERVICE" ]; then
   echo "SERVICE is missing"
   exit_with_usage
 fi