Add post-create hook

Note that this is invoked *before* the application is deployed, so it's usage is quite different than a potential post-successful-create hook.

docs/development/plugin-triggers.md

@@ -380,6 +380,27 @@ docker commit $id $IMAGE > /dev/null
 dokku_log_info1 "Building UI Complete"
 ```
 
+### `post-create`
+
+- Description: Can be used to run commands after an application is created.
+- Invoked by: `dokku apps:create`
+- Arguments: `$APP`
+- Example:
+
+```shell
+#!/usr/bin/env bash
+# Runs a command to ensure that an app
+# has a postgres database when it is starting
+
+set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
+
+APP="$1";
+POSTGRES="$1"
+
+dokku postgres:create $POSTGRES
+dokku postgres:link $POSTGRES $APP
+```
+
 ### `post-deploy`
 
 - Description: Allows running of commands after a deploy has completed. Dokku core currently uses this to switch traffic on nginx.

plugins/apps/commands

@@ -2,6 +2,7 @@
 [[ " apps apps:create apps:destroy help apps:help " == *" $1 "* ]] || exit $DOKKU_NOT_IMPLEMENTED_EXIT
 set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
 source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
+source "$PLUGIN_AVAILABLE_PATH/apps/functions"
 
 case "$1" in
   apps)
@@ -10,12 +11,7 @@ case "$1" in
     ;;
 
   apps:create)
-    [[ -z $2 ]] && dokku_log_fail "Please specify an app to run the command on"
+    apps_create $2
-    [[ -d "$DOKKU_ROOT/$2" ]] && dokku_log_fail "Name is already taken"
-    APP="$2"
-
-    mkdir -p "$DOKKU_ROOT/$APP"
-    echo "Creating $APP... done"
     ;;
 
   apps:destroy)

plugins/apps/functions

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
+
+apps_create() {
+  [[ -z $1 ]] && dokku_log_fail "Please specify an app to run the command on"
+  [[ -d "$DOKKU_ROOT/$1" ]] && dokku_log_fail "Name is already taken"
+  local APP="$1"
+
+  mkdir -p "$DOKKU_ROOT/$APP"
+  echo "Creating $APP... done"
+  plugn trigger post-create $APP
+}

plugins/git/commands

@@ -1,6 +1,7 @@
 #!/usr/bin/env bash
 set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
 source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
+source "$PLUGIN_AVAILABLE_PATH/apps/functions"
 
 git_build_app_repo() {
   verify_app_name "$1"
@@ -14,6 +15,7 @@ git_build_app_repo() {
   chmod 755 $TMP_WORK_DIR
   unset GIT_DIR GIT_WORK_TREE
   pushd $TMP_WORK_DIR > /dev/null
+  [[ ! -d "$DOKKU_ROOT/$APP" ]] && apps_create $APP
   git clone -q "$DOKKU_ROOT/$APP" "$TMP_WORK_DIR" &> /dev/null
   git config advice.detachedHead false
   git checkout "$REV" &> /dev/null