Expose public/ API as submodule (#23345)

* model -> public/model

* plugin -> public/plugin

* public/model/utils -> public/utils

* platform/shared/mlog -> public/shared/mlog

* platform/shared/i18n -> public/shared/i18n

* platform/shared/markdown -> public/shared/markdown

* platform/services/timezones -> public/shared/timezones

* channels/einterfaces -> einterfaces

* expose public/ submodule

* go mod tidy

* .github: cache-dependency-path, setup-go-work

* modules-tidy for public/ too

* remove old gomodtidy

server/public/plugin/supervisor_test.go

@@ -0,0 +1,83 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package plugin
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/mattermost/mattermost-server/server/public/model"
+	"github.com/mattermost/mattermost-server/server/public/plugin/utils"
+	"github.com/mattermost/mattermost-server/server/public/shared/mlog"
+)
+
+func TestSupervisor(t *testing.T) {
+	for name, f := range map[string]func(*testing.T){
+		"Supervisor_InvalidExecutablePath":     testSupervisorInvalidExecutablePath,
+		"Supervisor_NonExistentExecutablePath": testSupervisorNonExistentExecutablePath,
+		"Supervisor_StartTimeout":              testSupervisorStartTimeout,
+	} {
+		t.Run(name, f)
+	}
+}
+
+func testSupervisorInvalidExecutablePath(t *testing.T) {
+	dir, err := os.MkdirTemp("", "")
+	require.NoError(t, err)
+	defer os.RemoveAll(dir)
+
+	os.WriteFile(filepath.Join(dir, "plugin.json"), []byte(`{"id": "foo", "server": {"executable": "/foo/../../backend.exe"}}`), 0600)
+
+	bundle := model.BundleInfoForPath(dir)
+	log := mlog.CreateConsoleTestLogger(true, mlog.LvlError)
+	defer log.Shutdown()
+	supervisor, err := newSupervisor(bundle, nil, nil, log, nil)
+	assert.Nil(t, supervisor)
+	assert.Error(t, err)
+}
+
+func testSupervisorNonExistentExecutablePath(t *testing.T) {
+	dir, err := os.MkdirTemp("", "")
+	require.NoError(t, err)
+	defer os.RemoveAll(dir)
+
+	os.WriteFile(filepath.Join(dir, "plugin.json"), []byte(`{"id": "foo", "server": {"executable": "thisfileshouldnotexist"}}`), 0600)
+
+	bundle := model.BundleInfoForPath(dir)
+	log := mlog.CreateConsoleTestLogger(true, mlog.LvlError)
+	defer log.Shutdown()
+	supervisor, err := newSupervisor(bundle, nil, nil, log, nil)
+	require.Error(t, err)
+	require.Nil(t, supervisor)
+}
+
+// If plugin development goes really wrong, let's make sure plugin activation won't block forever.
+func testSupervisorStartTimeout(t *testing.T) {
+	dir, err := os.MkdirTemp("", "")
+	require.NoError(t, err)
+	defer os.RemoveAll(dir)
+
+	backend := filepath.Join(dir, "backend.exe")
+	utils.CompileGo(t, `
+		package main
+
+		func main() {
+			for {
+			}
+		}
+	`, backend)
+
+	os.WriteFile(filepath.Join(dir, "plugin.json"), []byte(`{"id": "foo", "server": {"executable": "backend.exe"}}`), 0600)
+
+	bundle := model.BundleInfoForPath(dir)
+	log := mlog.CreateConsoleTestLogger(true, mlog.LvlError)
+	defer log.Shutdown()
+	supervisor, err := newSupervisor(bundle, nil, nil, log, nil)
+	require.Error(t, err)
+	require.Nil(t, supervisor)
+}