Add startup_services dock configuration functionality

This change enables owners of projects to specify which
services, defined within the project's docker-compose file,
to launch when standing up the project within an extended dock
environment. Particulary of note here is that this change allows
project owners to target variations of services and backend
components depending on context.

bin/dock

@@ -266,6 +266,15 @@ image() {
   fi
 }
 
+startup_services() {
+  if [ -z "${1+x}" ]; then
+    error "Must provide list of services (e.g service mysql)!"
+    return 1
+  else
+    startup_services="$1"
+  fi
+}
+
 pull_latest() {
   if [ -z "${1+x}" ] || "$1"; then
     pull=true
@@ -506,6 +515,13 @@ extend_container() {
     info "Unable to locate a $default_compose_file file for ${project}."
   fi
 
+  # Record the list of services to startup for this project and
+  # append to startup services list for container environment
+  existing_services="$(get_label_value $container_name startup_services)"
+  s="${existing_services} ${startup_services:- }"
+  s="$(echo $s | xargs -n1 | sort -u | xargs)"
+  label "startup_services" "$s"
+
   # proceed to launch extended dock container...
   # TODO: refactor below common setup (i.e. build of docker run args) to remove code
   # duplication
@@ -649,7 +665,10 @@ terraform_container() {
       docker-compose config > ${tmp_workspace}/$output_file"
     compose_args+=("--file" "$output_file")
   done
-  compose_args+=("up" "-d")
+  # Only start services which have been defined as startup services by composed
+  # projects
+  local services=$(get_label_value "$container_name" "startup_services") 
+  compose_args+=("up" "-d" "$services")
 
   # Purge all existing containers within Dock environment
   info "Purging existing Dock environment..."

script/entrypoint.bash

@@ -11,7 +11,7 @@ start_docker() {
     return
   fi
 
-  sudo dockerd >/dev/null 2>&1 &
+  sudo dockerd>/dev/null 2>&1 &
   dockerd_pid=$!
 
   local max_tries=5

test/options/extend.bats

@@ -17,6 +17,7 @@ teardown() {
 @test "configuration labels are added to Dock container during extension" {
   file Dockerfile <<-EOF
 FROM alpine:latest
+RUN apk update && apk add jq && rm -rf /var/cache/apk/*
 EOF
 
   file .dock <<-EOF
@@ -40,6 +41,7 @@ EOF
 @test "compose configuration label is not added to Dock container if compose file does not exist" {
   file Dockerfile <<-EOF
 FROM alpine:latest
+RUN apk update && apk add jq && rm -rf /var/cache/apk/*
 EOF
 
   file .dock <<-EOF
@@ -60,6 +62,7 @@ EOF
 @test "workspace dir is set as repo root of project during extension" {
   file Dockerfile <<-EOF
 FROM alpine:latest
+RUN apk update && apk add jq && rm -rf /var/cache/apk/*
 EOF
 
   file .dock <<-EOF
@@ -81,6 +84,7 @@ EOF
 @test "extending a project overrides previous Dock configuration labels for project" {
   file Dockerfile <<-EOF
 FROM alpine:latest
+RUN apk update && apk add jq && rm -rf /var/cache/apk/*
 EOF
 
   file .dock <<-EOF
@@ -109,6 +113,7 @@ EOF
 @test "extending a non-existent Dock container successfully" {
   file Dockerfile <<-EOF
 FROM alpine:latest
+RUN apk update && apk add jq && rm -rf /var/cache/apk/*
 EOF
 
   file .dock <<-EOF
@@ -132,6 +137,7 @@ EOF
 @test "extending an existing Dock container successfully" {
   file Dockerfile <<-EOF
 FROM alpine:latest
+RUN apk update && apk add jq && rm -rf /var/cache/apk/*
 EOF
 
   echo "mytesting" > /tmp/myfile
@@ -164,3 +170,58 @@ EOF
   # verify project ports are published
   docker port test | grep 8888
 }
+
+@test "startup_services labels are set when specified by project configuration" {
+  file Dockerfile <<-EOF
+FROM alpine:latest
+RUN apk update && apk add jq && rm -rf /var/cache/apk/*
+EOF
+
+  file .dock <<-EOF
+dockerfile Dockerfile
+startup_services 'service backend'
+default_command sh
+EOF
+
+  file docker-compose.yml <<-EOF
+version: '2'
+EOF
+
+  run dock -e test
+
+  [ "$status" -eq 0 ]
+  # verify startup_services label has been applied
+  labels="$(get_labels test)"
+  [ "$(echo "$labels" | grep -c startup_services)" -eq 1 ]
+  echo "$labels" | grep service
+  echo "$labels" | grep backend
+}
+
+@test "duplicate startup_services label values are filtered during extension" {
+  file Dockerfile <<-EOF
+FROM alpine:latest
+RUN apk update && apk add jq && rm -rf /var/cache/apk/*
+EOF
+
+  file .dock <<-EOF
+dockerfile Dockerfile
+startup_services 'another_service backend another_backend'
+default_command sh
+EOF
+
+  file docker-compose.yml <<-EOF
+version: '2'
+EOF
+
+  docker run --name test -d --label startup_services='service backend' alpine:latest sh
+  run dock -e test
+
+  [ "$status" -eq 0 ]
+  # verify duplicated startup_services labels are filtered accordingly
+  labels="$(get_labels test)"
+  [ "$(echo "$labels" | grep -c startup_services)" -eq 1 ]
+  [ "$(echo "$labels" | grep -c service)" -eq 1 ]
+  [ "$(echo "$labels" | grep -c another_service)" -eq 1 ]
+  [ "$(echo "$labels" | grep -c backend)" -eq 1 ]
+  [ "$(echo "$labels" | grep -c another_backend)" -eq 1 ]
+}