feat: add service:links command

This allows users to script against apps that are linked to a given service

common-functions

@@ -468,7 +468,7 @@ service_link() {
 }
 
 service_linked_apps() {
-  declare desc="Lists all applications linked to a service"
+  declare desc="Lists all apps linked to a service for info output"
   declare SERVICE="$1"
   local SERVICE_ROOT="$PLUGIN_DATA_ROOT/$SERVICE"
   local LINKS_FILE="$SERVICE_ROOT/LINKS"
@@ -479,6 +479,18 @@ service_linked_apps() {
   tr '\n' ' ' <"$LINKS_FILE"
 }
 
+service_links() {
+  declare desc="Lists all apps linked to a service"
+  declare SERVICE="$1"
+  local SERVICE_ROOT="$PLUGIN_DATA_ROOT/$SERVICE"
+  local LINKS_FILE="$SERVICE_ROOT/LINKS"
+
+  touch "$LINKS_FILE"
+  [[ -z $(<"$LINKS_FILE") ]] && return 0
+
+  cat "$LINKS_FILE"
+}
+
 service_list() {
   declare desc="Lists all services and their status"
   local SERVICES=$(ls "$PLUGIN_DATA_ROOT" 2>/dev/null)

subcommands/links

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/config"
+set -eo pipefail
+[[ $DOKKU_TRACE ]] && set -x
+source "$PLUGIN_BASE_PATH/common/functions"
+source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/functions"
+
+service-links-cmd() {
+  #E list all apps linked to the 'lolipop' $PLUGIN_COMMAND_PREFIX service.
+  #E dokku $PLUGIN_COMMAND_PREFIX:links lolipop
+  #A service, service to run command against
+  declare desc="list all apps linked to the $PLUGIN_SERVICE service"
+  local cmd="$PLUGIN_COMMAND_PREFIX:links" argv=("$@")
+  [[ ${argv[0]} == "$cmd" ]] && shift 1
+  declare SERVICE="$1"
+  local SERVICE_ROOT="$PLUGIN_DATA_ROOT/$SERVICE"
+  local LINKS_FILE="$SERVICE_ROOT/LINKS"
+
+  [[ -z "$SERVICE" ]] && dokku_log_fail "Please specify a valid name for the service"
+  verify_service_name "$SERVICE"
+  service_links "$SERVICE"
+}
+
+service-links-cmd "$@"