refactor: decrease compile time for golang plugins

This change refactors the compiled golang plugins into 3 distinct binaries:

- commands: already existing
- subcommands/subcommands: entrypoint into all subcommands
- triggers: entrypoint into all triggers

It then further symlinks triggers and subcommands to the built binaries. This results in both a much faster build process as well as smaller package size.

plugins/config/src/subcommands/bundle/bundle.go

@@ -1,16 +0,0 @@
-package main
-
-import (
-	"flag"
-	"os"
-
-	"github.com/dokku/dokku/plugins/config"
-)
-
-func main() {
-	args := flag.NewFlagSet("config:bundle", flag.ExitOnError)
-	global := args.Bool("global", false, "--global: use the global environment")
-	merged := args.Bool("merged", false, "--merged: merge app environment and global environment")
-	args.Parse(os.Args[2:])
-	config.CommandBundle(args.Args(), *global, *merged)
-}

plugins/config/src/subcommands/clear/clear.go

@@ -1,17 +0,0 @@
-package main
-
-import (
-	"flag"
-	"os"
-
-	"github.com/dokku/dokku/plugins/config"
-)
-
-//clear all entries from the given environment
-func main() {
-	args := flag.NewFlagSet("config:clear", flag.ExitOnError)
-	global := args.Bool("global", false, "--global: use the global environment")
-	noRestart := args.Bool("no-restart", false, "--no-restart: no restart")
-	args.Parse(os.Args[2:])
-	config.CommandClear(args.Args(), *global, *noRestart)
-}

plugins/config/src/subcommands/export/export.go

@@ -1,20 +0,0 @@
-package main
-
-import (
-	"flag"
-	"os"
-
-	"github.com/dokku/dokku/plugins/config"
-)
-
-// print the environment to stdout
-func main() {
-	const defaultPrefix = "export "
-	const defaultSeparator = "\n"
-	args := flag.NewFlagSet("config:export", flag.ExitOnError)
-	global := args.Bool("global", false, "--global: use the global environment")
-	merged := args.Bool("merged", false, "--merged: merge app environment and global environment")
-	format := args.String("format", "exports", "--format: [ exports | envfile | docker-args | shell | pretty | json | json-list ] which format to export as)")
-	args.Parse(os.Args[2:])
-	config.CommandExport(args.Args(), *global, *merged, *format)
-}

plugins/config/src/subcommands/get/get.go

@@ -1,17 +0,0 @@
-package main
-
-import (
-	"flag"
-	"os"
-
-	"github.com/dokku/dokku/plugins/config"
-)
-
-// get the given entries from the specified environment
-func main() {
-	args := flag.NewFlagSet("config:get", flag.ExitOnError)
-	global := args.Bool("global", false, "--global: use the global environment")
-	quoted := args.Bool("quoted", false, "--quoted: get the value quoted")
-	args.Parse(os.Args[2:])
-	config.CommandGet(args.Args(), *global, *quoted)
-}

plugins/config/src/subcommands/keys/keys.go

@@ -1,16 +0,0 @@
-package main
-
-import (
-	"flag"
-	"os"
-
-	"github.com/dokku/dokku/plugins/config"
-)
-
-func main() {
-	args := flag.NewFlagSet("config:keys", flag.ExitOnError)
-	global := args.Bool("global", false, "--global: use the global environment")
-	merged := args.Bool("merged", false, "--merged: merge app environment and global environment")
-	args.Parse(os.Args[2:])
-	config.CommandKeys(args.Args(), *global, *merged)
-}

plugins/config/src/subcommands/set/set.go

@@ -1,18 +0,0 @@
-package main
-
-import (
-	"flag"
-	"os"
-
-	"github.com/dokku/dokku/plugins/config"
-)
-
-// set the given entries to the specified environment
-func main() {
-	args := flag.NewFlagSet("config:set", flag.ExitOnError)
-	global := args.Bool("global", false, "--global: use the global environment")
-	encoded := args.Bool("encoded", false, "--encoded: interpret VALUEs as base64")
-	noRestart := args.Bool("no-restart", false, "--no-restart: no restart")
-	args.Parse(os.Args[2:])
-	config.CommandSet(args.Args(), *global, *noRestart, *encoded)
-}

plugins/config/src/subcommands/subcommands.go

@@ -0,0 +1,67 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/dokku/dokku/plugins/common"
+	"github.com/dokku/dokku/plugins/config"
+)
+
+// main entrypoint to all subcommands
+func main() {
+	parts := strings.Split(os.Args[0], "/")
+	subcommand := parts[len(parts)-1]
+
+	switch subcommand {
+	case "bundle":
+		args := flag.NewFlagSet("config:bundle", flag.ExitOnError)
+		global := args.Bool("global", false, "--global: use the global environment")
+		merged := args.Bool("merged", false, "--merged: merge app environment and global environment")
+		args.Parse(os.Args[2:])
+		config.CommandBundle(args.Args(), *global, *merged)
+	case "clear":
+		args := flag.NewFlagSet("config:clear", flag.ExitOnError)
+		global := args.Bool("global", false, "--global: use the global environment")
+		noRestart := args.Bool("no-restart", false, "--no-restart: no restart")
+		args.Parse(os.Args[2:])
+		config.CommandClear(args.Args(), *global, *noRestart)
+	case "export":
+		args := flag.NewFlagSet("config:export", flag.ExitOnError)
+		global := args.Bool("global", false, "--global: use the global environment")
+		merged := args.Bool("merged", false, "--merged: merge app environment and global environment")
+		format := args.String("format", "exports", "--format: [ exports | envfile | docker-args | shell | pretty | json | json-list ] which format to export as)")
+		args.Parse(os.Args[2:])
+		config.CommandExport(args.Args(), *global, *merged, *format)
+	case "get":
+		args := flag.NewFlagSet("config:get", flag.ExitOnError)
+		global := args.Bool("global", false, "--global: use the global environment")
+		quoted := args.Bool("quoted", false, "--quoted: get the value quoted")
+		args.Parse(os.Args[2:])
+		config.CommandGet(args.Args(), *global, *quoted)
+	case "keys":
+		args := flag.NewFlagSet("config:keys", flag.ExitOnError)
+		global := args.Bool("global", false, "--global: use the global environment")
+		merged := args.Bool("merged", false, "--merged: merge app environment and global environment")
+		args.Parse(os.Args[2:])
+		config.CommandKeys(args.Args(), *global, *merged)
+	case "set":
+		args := flag.NewFlagSet("config:set", flag.ExitOnError)
+		global := args.Bool("global", false, "--global: use the global environment")
+		encoded := args.Bool("encoded", false, "--encoded: interpret VALUEs as base64")
+		noRestart := args.Bool("no-restart", false, "--no-restart: no restart")
+		args.Parse(os.Args[2:])
+		config.CommandSet(args.Args(), *global, *noRestart, *encoded)
+	case "unset":
+		args := flag.NewFlagSet("config:unset", flag.ExitOnError)
+		global := args.Bool("global", false, "--global: use the global environment")
+		noRestart := args.Bool("no-restart", false, "--no-restart: no restart")
+		args.Parse(os.Args[2:])
+		config.CommandUnset(args.Args(), *global, *noRestart)
+	default:
+		common.LogFail(fmt.Sprintf("Invalid plugin subcommand call: %s", subcommand))
+	}
+
+}

plugins/config/src/subcommands/unset/unset.go

@@ -1,17 +0,0 @@
-package main
-
-import (
-	"flag"
-	"os"
-
-	"github.com/dokku/dokku/plugins/config"
-)
-
-//unset the given entries from the given environment
-func main() {
-	args := flag.NewFlagSet("config:unset", flag.ExitOnError)
-	global := args.Bool("global", false, "--global: use the global environment")
-	noRestart := args.Bool("no-restart", false, "--no-restart: no restart")
-	args.Parse(os.Args[2:])
-	config.CommandUnset(args.Args(), *global, *noRestart)
-}