Integration test for migration (#18124)

integrations: basic test for Gitea {dump,restore}-repo
This is a first step for integration testing of DumpRepository and
RestoreRepository. It:

runs a Gitea server,
dumps a repo via DumpRepository to the filesystem,
restores the repo via RestoreRepository from the filesystem,
dumps the restored repository to the filesystem,
compares the first and second dump and expects them to be identical

The verification is trivial and the goal is to add more tests for each
topic of the dump.

Signed-off-by: Loïc Dachary <loic@dachary.org>

integrations/dump_restore_test.go

@@ -0,0 +1,104 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package integrations
+
+import (
+	"context"
+	"net/url"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	repo_model "code.gitea.io/gitea/models/repo"
+	"code.gitea.io/gitea/models/unittest"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/structs"
+	"code.gitea.io/gitea/modules/util"
+	"code.gitea.io/gitea/services/migrations"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestDumpRestore(t *testing.T) {
+	onGiteaRun(t, func(t *testing.T, u *url.URL) {
+		AllowLocalNetworks := setting.Migrations.AllowLocalNetworks
+		setting.Migrations.AllowLocalNetworks = true
+		AppVer := setting.AppVer
+		// Gitea SDK (go-sdk) need to parse the AppVer from server response, so we must set it to a valid version string.
+		setting.AppVer = "1.16.0"
+		defer func() {
+			setting.Migrations.AllowLocalNetworks = AllowLocalNetworks
+			setting.AppVer = AppVer
+		}()
+
+		assert.NoError(t, migrations.Init())
+
+		reponame := "repo1"
+
+		basePath, err := os.MkdirTemp("", reponame)
+		assert.NoError(t, err)
+		defer util.RemoveAll(basePath)
+
+		repo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{Name: reponame}).(*repo_model.Repository)
+		repoOwner := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: repo.OwnerID}).(*user_model.User)
+		session := loginUser(t, repoOwner.Name)
+		token := getTokenForLoggedInUser(t, session)
+
+		//
+		// Phase 1: dump repo1 from the Gitea instance to the filesystem
+		//
+
+		ctx := context.Background()
+		var opts = migrations.MigrateOptions{
+			GitServiceType: structs.GiteaService,
+			Issues:         true,
+			Comments:       true,
+			AuthToken:      token,
+			CloneAddr:      repo.CloneLink().HTTPS,
+			RepoName:       reponame,
+		}
+		err = migrations.DumpRepository(ctx, basePath, repoOwner.Name, opts)
+		assert.NoError(t, err)
+
+		//
+		// Verify desired side effects of the dump
+		//
+		d := filepath.Join(basePath, repo.OwnerName, repo.Name)
+		for _, f := range []string{"repo.yml", "topic.yml", "issue.yml"} {
+			assert.FileExists(t, filepath.Join(d, f))
+		}
+
+		//
+		// Phase 2: restore from the filesystem to the Gitea instance in restoredrepo
+		//
+
+		newreponame := "restoredrepo"
+		err = migrations.RestoreRepository(ctx, d, repo.OwnerName, newreponame, []string{"issues", "comments"})
+		assert.NoError(t, err)
+
+		newrepo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{Name: newreponame}).(*repo_model.Repository)
+
+		//
+		// Phase 3: dump restoredrepo from the Gitea instance to the filesystem
+		//
+		opts.RepoName = newreponame
+		opts.CloneAddr = newrepo.CloneLink().HTTPS
+		err = migrations.DumpRepository(ctx, basePath, repoOwner.Name, opts)
+		assert.NoError(t, err)
+
+		//
+		// Verify the dump of restoredrepo is the same as the dump of repo1
+		//
+		newd := filepath.Join(basePath, newrepo.OwnerName, newrepo.Name)
+		beforeBytes, err := os.ReadFile(filepath.Join(d, "repo.yml"))
+		assert.NoError(t, err)
+		before := strings.ReplaceAll(string(beforeBytes), reponame, newreponame)
+		after, err := os.ReadFile(filepath.Join(newd, "repo.yml"))
+		assert.NoError(t, err)
+		assert.EqualValues(t, before, string(after))
+	})
+}