feat: implement getPhaseScript and scaffold out plugin triggers

plugins/app-json/appjson.go

@@ -0,0 +1,47 @@
+package appjson
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"os"
+
+	"github.com/dokku/dokku/plugins/common"
+)
+
+type AppJson struct {
+	Scripts struct {
+		Dokku string `json:"dokku"`
+	} `json:"scripts"`
+}
+
+// getPhaseScript extracts app.json from app image and returns the appropriate json key/value
+func getPhaseScript(appName string, image string, phase string) (string, error) {
+	appJsonFile, err := ioutil.TempFile(os.TempDir(), fmt.Sprintf("dokku-%s-%s", common.MustGetEnv("DOKKU_PID"), "getPhaseScript"))
+	if err != nil {
+		return "", fmt.Errorf("Cannot create temporary file: %v", err)
+	}
+
+	defer os.Remove(appJsonFile.Name())
+
+	common.CopyFromImage(appName, image, "app.json", appJsonFile.Name())
+	if !common.FileExists(appJsonFile.Name()) {
+		return "", nil
+	}
+
+	b, err := ioutil.ReadAll(appJsonFile)
+	if err != nil {
+		return "", fmt.Errorf("Cannot read app.json file: %v", err)
+	}
+
+	var appJson AppJson
+	if err = json.Unmarshal(b, &appJson); err != nil {
+		return "", fmt.Errorf("Cannot parse app.json: %v", err)
+	}
+
+	return appJson.Scripts.Dokku, nil
+}
+
+func executeScript(appName string, imageTag string, phase string) error {
+	return nil
+}

plugins/app-json/post-deploy

@@ -1,16 +0,0 @@
-#!/usr/bin/env bash
-set -eo pipefail
-[[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
-source "$PLUGIN_CORE_AVAILABLE_PATH/app-json/internal-functions"
-
-trigger-app-json-post-deploy() {
-  declare desc="app-json scripts execution"
-  declare trigger="post-deploy"
-  declare APP="$1" IMAGE_TAG="$4"
-  local PHASE_SCRIPT_KEY="postdeploy"
-
-  execute_script "$APP" "$IMAGE_TAG" "$PHASE_SCRIPT_KEY"
-}
-
-trigger-app-json-post-deploy "$@"

plugins/app-json/pre-deploy

@@ -1,17 +0,0 @@
-#!/usr/bin/env bash
-set -eo pipefail
-[[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
-source "$PLUGIN_CORE_AVAILABLE_PATH/app-json/internal-functions"
-
-trigger-app-json-pre-deploy() {
-  declare desc="app-json scripts execution"
-  declare trigger="pre-deploy"
-  declare APP="$1" IMAGE_TAG="$2"
-  local PHASE_SCRIPT_KEY="predeploy"
-
-  execute_script "$APP" "$IMAGE_TAG" "$PHASE_SCRIPT_KEY"
-  execute_script "$APP" "$IMAGE_TAG" "release"
-}
-
-trigger-app-json-pre-deploy "$@"

plugins/app-json/src/triggers/triggers.go

@@ -0,0 +1,36 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/dokku/dokku/plugins/app-json"
+	"github.com/dokku/dokku/plugins/common"
+)
+
+// main entrypoint to all triggers
+func main() {
+	parts := strings.Split(os.Args[0], "/")
+	trigger := parts[len(parts)-1]
+	flag.Parse()
+
+	var err error
+	switch trigger {
+	case "post-deploy":
+		appName := flag.Arg(0)
+		imageTag := flag.Arg(3)
+		err = appjson.TriggerPostDeploy(appName, imageTag)
+	case "pre-deploy":
+		appName := flag.Arg(0)
+		imageTag := flag.Arg(1)
+		err = appjson.TriggerPreDeploy(appName, imageTag)
+	default:
+		common.LogFail(fmt.Sprintf("Invalid plugin trigger call: %s", trigger))
+	}
+
+	if err != nil {
+		common.LogFail(err.Error())
+	}
+}

plugins/app-json/triggers.go

@@ -0,0 +1,19 @@
+package appjson
+
+func TriggerPostDeploy(appName string, imageTag string) error {
+	if err := executeScript(appName, imageTag, "predeploy"); err != nil {
+		return err
+	}
+
+	if err := executeScript(appName, imageTag, "release"); err != nil {
+		return err
+	}
+	return nil
+}
+
+func TriggerPreDeploy(appName string, imageTag string) error {
+	if err := executeScript(appName, imageTag, "postdeploy"); err != nil {
+		return err
+	}
+	return nil
+}