Add postgres:reset command

Author: jayjun

README.md

@@ -42,6 +42,7 @@ postgres:list                     List all postgres services
 postgres:logs <name> [-t]         Print the most recent log(s) for this service
 postgres:promote <name> <app>     Promote service <name> as DATABASE_URL in <app>
 postgres:restart <name>           Graceful shutdown and restart of the postgres service container
+postgres:reset <name>             Delete all data in the postgres service
 postgres:start <name>             Start a previously stopped postgres service
 postgres:stop <name>              Stop a running postgres service
 postgres:unexpose <name>          Unexpose a previously exposed postgres service
@@ -152,6 +153,9 @@ dokku postgres:import lolipop < database.dump
 # you can clone an existing database to a new one
 dokku postgres:clone lolipop new_database
 
+# you can reset a database to delete all its data
+dokku postgres:reset lolipop
+
 # finally, you can destroy the container
 dokku postgres:destroy lolipop
 ```

common-functions

@@ -100,6 +100,26 @@ is_valid_service_name() {
   return 1
 }
 
+prompt_confirmation() {
+  declare desc="Prompts user to confirm destructive action"
+  declare MESSAGE="$1" SERVICE="$2" FORCE_FLAG="$3"
+
+  if [[ "$FORCE_FLAG" == "force" ]] || [[ "$FORCE_FLAG" == "-f" ]] || [[ "$FORCE_FLAG" == "--force" ]]; then
+    DOKKU_APPS_FORCE_DELETE=1
+  fi
+  if [[ -z "$DOKKU_APPS_FORCE_DELETE" ]]; then
+    dokku_log_warn "WARNING: Potentially Destructive Action"
+    dokku_log_warn "$MESSAGE"
+    dokku_log_warn "To proceed, type \"$SERVICE\""
+    echo ""
+
+    read -rp "> " service_name
+    if [[ "$service_name" != "$SERVICE" ]]; then
+      dokku_log_fail "Confirmation did not match $SERVICE. Aborted."
+    fi
+  fi
+}
+
 remove_from_links_file() {
   declare desc="Removes an app from the service link file"
   declare SERVICE="$1" APP="$2"

functions

@@ -121,6 +121,17 @@ service_import() {
   docker exec -i "$SERVICE_NAME" env PGPASSWORD="$PASSWORD" pg_restore -h localhost -cO --if-exists -d "$DATABASE_NAME" -U postgres -w
 }
 
+service_reset() {
+  local SERVICE="$1"
+  local SERVICE_NAME="$(get_service_name "$SERVICE")"
+  local DATABASE_NAME="$(get_database_name "$SERVICE")"
+
+  dokku_log_info2_quiet "Deleting all data in $SERVICE"
+  docker exec "$SERVICE_NAME" su - postgres -c "dropdb $DATABASE_NAME"
+  docker exec "$SERVICE_NAME" su - postgres -c "createdb -E utf8 $DATABASE_NAME"
+  dokku_log_info2 "All $SERVICE data deleted"
+}
+
 service_start() {
   local SERVICE="$1"
   local QUIET="$2"

subcommands/destroy

@@ -24,21 +24,8 @@ service-destroy-cmd() {
 
   [[ -s "$LINKS_FILE" ]] && dokku_log_fail "Cannot delete linked service"
 
-  if [[ "$FORCE_FLAG" == "force" ]] || [[ "$FORCE_FLAG" == "-f" ]] || [[ "$FORCE_FLAG" == "--force" ]]; then
-    DOKKU_APPS_FORCE_DELETE=1
-  fi
-  if [[ -z "$DOKKU_APPS_FORCE_DELETE" ]]; then
-    dokku_log_warn "WARNING: Potentially Destructive Action"
-    dokku_log_warn "This command will destroy $SERVICE $PLUGIN_SERVICE service."
-    dokku_log_warn "To proceed, type \"$SERVICE\""
-    echo ""
-
-    read -rp "> " service_name
-    if [[ "$service_name" != "$SERVICE" ]]; then
-      dokku_log_warn "Confirmation did not match $SERVICE. Aborted."
-      exit 1
-    fi
-  fi
+  local message="This command will destroy $SERVICE $PLUGIN_SERVICE service."
+  prompt_confirmation "$message" "$SERVICE" "$FORCE_FLAG"
 
   dokku_log_info2_quiet "Deleting $SERVICE"
   service_backup_unschedule "$SERVICE"

subcommands/reset

@@ -0,0 +1,25 @@
+#!/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-reset-cmd() {
+  #E delete all data in $PLUGIN_COMMAND_PREFIX service named lolipop
+  #E dokku $PLUGIN_COMMAND_PREFIX:reset lolipop
+  #A service, service to run command against
+  #F -f|--force, force delete without asking for confirmation
+  declare desc="delete all data in $PLUGIN_SERVICE service"
+  local cmd="$PLUGIN_COMMAND_PREFIX:reset" argv=("$@"); [[ ${argv[0]} == "$cmd" ]] && shift 1
+  declare SERVICE="$1" FORCE_FLAG="$2"
+
+  [[ -z "$SERVICE" ]] && dokku_log_fail "Please specify a name for the service"
+  verify_service_name "$SERVICE"
+
+  local message="This command will delete all data in $SERVICE $PLUGIN_SERVICE service."
+  prompt_confirmation "$message" "$SERVICE" "$FORCE_FLAG"
+
+  service_reset "$SERVICE"
+}
+
+service-reset-cmd "$@"

tests/service_reset.bats

@@ -0,0 +1,18 @@
+#!/usr/bin/env bats
+load test_helper
+
+@test "($PLUGIN_COMMAND_PREFIX:reset) success with --force" {
+  dokku "$PLUGIN_COMMAND_PREFIX:create" l
+  run dokku --force "$PLUGIN_COMMAND_PREFIX:reset" l
+  assert_contains "${lines[*]}" "All l data deleted"
+}
+
+@test "($PLUGIN_COMMAND_PREFIX:reset) error when there are no arguments" {
+  run dokku "$PLUGIN_COMMAND_PREFIX:reset"
+  assert_contains "${lines[*]}" "Please specify a name for the service"
+}
+
+@test "($PLUGIN_COMMAND_PREFIX:reset) error when service does not exist" {
+  run dokku "$PLUGIN_COMMAND_PREFIX:reset" not_existing_service
+  assert_contains "${lines[*]}" "service not_existing_service does not exist"
+}