feat: allow checking if a service is linked to an app

README.md

@@ -34,6 +34,7 @@ mysql:expose <name> [port]     Expose a mysql service on custom port if provided
 mysql:import <name> < <file>   Import a dump into the mysql service database
 mysql:info <name>              Print the connection information
 mysql:link <name> <app>        Link the mysql service to the app
+mysql:linked <name> <app>      Check if the mysql service is linked to an app
 mysql:list                     List all mysql services
 mysql:logs <name> [-t]         Print the most recent log(s) for this service
 mysql:promote <name> <app>     Promote service <name> as DATABASE_URL in <app>

common-functions

@@ -288,6 +288,20 @@ service_info() {
   fi
 }
 
+service_is_linked() {
+  declare desc="Links a service to an application"
+  declare SERVICE="$1" APP="$2"
+  update_plugin_scheme_for_app "$APP"
+  local SERVICE_URL=$(service_url "$SERVICE")
+  local EXISTING_CONFIG=$(config_all "$APP")
+  local LINK=$(echo "$EXISTING_CONFIG" | grep "$SERVICE_URL" | cut -d: -f1) || true
+  if [[ -z $LINK ]]; then
+    dokku_log_warn "Service $SERVICE is not linked to $APP"
+    exit 1
+  fi
+  dokku_log_info1 "Service $SERVICE is linked to $APP"
+}
+
 service_link() {
   declare desc="Links a service to an application"
   declare SERVICE="$1" APP="$2"

subcommands/linked

@@ -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-linked-cmd() {
+  #E here we check if the lolipop $PLUGIN_COMMAND_PREFIX service is linked to the 'playground' app.
+  #E dokku $PLUGIN_COMMAND_PREFIX:linked lolipop playground
+  #A service, service to run command against
+  #A app, app to run command against
+  declare desc="check if the $PLUGIN_SERVICE service is linked to an app"
+  local cmd="$PLUGIN_COMMAND_PREFIX:linked" argv=("$@"); [[ ${argv[0]} == "$cmd" ]] && shift 1
+  declare SERVICE="$1" APP="$2"
+  APP=${APP:="$DOKKU_APP_NAME"}
+
+  [[ -z "$SERVICE" ]] && dokku_log_fail "Please specify a name for the service"
+  [[ -z "$APP" ]] && dokku_log_fail "Please specify an app to run the command on"
+  verify_app_name "$APP"
+  verify_service_name "$SERVICE"
+  service_is_linked "$SERVICE" "$APP"
+}
+
+service-linked-cmd "$@"