Dump github/gitlab/gitea repository data to a local directory and restore to gitea (#12244)

* Dump github/gitlab repository data to a local directory

* Fix lint

* Adjust directory structure

* Allow migration special units

* Allow migration ignore release assets

* Fix lint

* Add restore repository

* stage the changes

* Merge

* Fix lint

* Update the interface

* Add some restore methods

* Finish restore

* Add comments

* Fix restore

* Add a token flag

* Fix bug

* Fix test

* Fix test

* Fix bug

* Fix bug

* Fix lint

* Fix restore

* refactor downloader

* fmt

* Fix bug isEnd detection on getIssues

* Refactor maxPerPage

* Remove unused codes

* Remove unused codes

* Fix bug

* Fix restore

* Fix dump

* Uploader should not depend downloader

* use release attachment name but not id

* Fix restore bug

* Fix lint

* Fix restore bug

* Add a method of DownloadFunc for base.Release to make uploader not depend on downloader

* fix Release yml marshal

* Fix trace information

* Fix bug when dump & restore

* Save relative path on yml file

* Fix bug

* Use relative path

* Update docs

* Use git service string but not int

* Recognize clone addr to service type

1 files changed, 276 insertions, 0 deletions

diff --git a/modules/migrations/restore.go b/modules/migrations/restore.go
new file mode 100644
index 0000000000..5550aaeb03
--- /dev/null
+++ b/modules/migrations/restore.go
@@ -0,0 +1,276 @@
+// Copyright 2020 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 migrations
+
+import (
+	"context"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strconv"
+
+	"code.gitea.io/gitea/modules/migrations/base"
+
+	"gopkg.in/yaml.v2"
+)
+
+// RepositoryRestorer implements an Downloader from the local directory
+type RepositoryRestorer struct {
+	ctx       context.Context
+	baseDir   string
+	repoOwner string
+	repoName  string
+}
+
+// NewRepositoryRestorer creates a repository restorer which could restore repository from a dumped folder
+func NewRepositoryRestorer(ctx context.Context, baseDir string, owner, repoName string) (*RepositoryRestorer, error) {
+	baseDir, err := filepath.Abs(baseDir)
+	if err != nil {
+		return nil, err
+	}
+	return &RepositoryRestorer{
+		ctx:       ctx,
+		baseDir:   baseDir,
+		repoOwner: owner,
+		repoName:  repoName,
+	}, nil
+}
+
+func (r *RepositoryRestorer) commentDir() string {
+	return filepath.Join(r.baseDir, "comments")
+}
+
+func (r *RepositoryRestorer) reviewDir() string {
+	return filepath.Join(r.baseDir, "reviews")
+}
+
+// SetContext set context
+func (r *RepositoryRestorer) SetContext(ctx context.Context) {
+	r.ctx = ctx
+}
+
+// GetRepoInfo returns a repository information
+func (r *RepositoryRestorer) GetRepoInfo() (*base.Repository, error) {
+	p := filepath.Join(r.baseDir, "repo.yml")
+	bs, err := ioutil.ReadFile(p)
+	if err != nil {
+		return nil, err
+	}
+
+	var opts = make(map[string]string)
+	err = yaml.Unmarshal(bs, &opts)
+	if err != nil {
+		return nil, err
+	}
+
+	isPrivate, _ := strconv.ParseBool(opts["is_private"])
+
+	return &base.Repository{
+		Owner:         r.repoOwner,
+		Name:          r.repoName,
+		IsPrivate:     isPrivate,
+		Description:   opts["description"],
+		OriginalURL:   opts["original_url"],
+		CloneURL:      opts["clone_addr"],
+		DefaultBranch: opts["default_branch"],
+	}, nil
+}
+
+// GetTopics return github topics
+func (r *RepositoryRestorer) GetTopics() ([]string, error) {
+	p := filepath.Join(r.baseDir, "topic.yml")
+
+	var topics = struct {
+		Topics []string `yaml:"topics"`
+	}{}
+
+	bs, err := ioutil.ReadFile(p)
+	if err != nil {
+		return nil, err
+	}
+
+	err = yaml.Unmarshal(bs, &topics)
+	if err != nil {
+		return nil, err
+	}
+	return topics.Topics, nil
+}
+
+// GetMilestones returns milestones
+func (r *RepositoryRestorer) GetMilestones() ([]*base.Milestone, error) {
+	var milestones = make([]*base.Milestone, 0, 10)
+	p := filepath.Join(r.baseDir, "milestone.yml")
+	_, err := os.Stat(p)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return nil, nil
+		}
+		return nil, err
+	}
+
+	bs, err := ioutil.ReadFile(p)
+	if err != nil {
+		return nil, err
+	}
+
+	err = yaml.Unmarshal(bs, &milestones)
+	if err != nil {
+		return nil, err
+	}
+	return milestones, nil
+}
+
+// GetReleases returns releases
+func (r *RepositoryRestorer) GetReleases() ([]*base.Release, error) {
+	var releases = make([]*base.Release, 0, 10)
+	p := filepath.Join(r.baseDir, "release.yml")
+	_, err := os.Stat(p)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return nil, nil
+		}
+		return nil, err
+	}
+
+	bs, err := ioutil.ReadFile(p)
+	if err != nil {
+		return nil, err
+	}
+
+	err = yaml.Unmarshal(bs, &releases)
+	if err != nil {
+		return nil, err
+	}
+	for _, rel := range releases {
+		for _, asset := range rel.Assets {
+			*asset.DownloadURL = "file://" + filepath.Join(r.baseDir, *asset.DownloadURL)
+		}
+	}
+	return releases, nil
+}
+
+// GetLabels returns labels
+func (r *RepositoryRestorer) GetLabels() ([]*base.Label, error) {
+	var labels = make([]*base.Label, 0, 10)
+	p := filepath.Join(r.baseDir, "label.yml")
+	_, err := os.Stat(p)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return nil, nil
+		}
+		return nil, err
+	}
+
+	bs, err := ioutil.ReadFile(p)
+	if err != nil {
+		return nil, err
+	}
+
+	err = yaml.Unmarshal(bs, &labels)
+	if err != nil {
+		return nil, err
+	}
+	return labels, nil
+}
+
+// GetIssues returns issues according start and limit
+func (r *RepositoryRestorer) GetIssues(page, perPage int) ([]*base.Issue, bool, error) {
+	var issues = make([]*base.Issue, 0, 10)
+	p := filepath.Join(r.baseDir, "issue.yml")
+	_, err := os.Stat(p)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return nil, true, nil
+		}
+		return nil, false, err
+	}
+
+	bs, err := ioutil.ReadFile(p)
+	if err != nil {
+		return nil, false, err
+	}
+
+	err = yaml.Unmarshal(bs, &issues)
+	if err != nil {
+		return nil, false, err
+	}
+	return issues, true, nil
+}
+
+// GetComments returns comments according issueNumber
+func (r *RepositoryRestorer) GetComments(issueNumber int64) ([]*base.Comment, error) {
+	var comments = make([]*base.Comment, 0, 10)
+	p := filepath.Join(r.commentDir(), fmt.Sprintf("%d.yml", issueNumber))
+	_, err := os.Stat(p)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return nil, nil
+		}
+		return nil, err
+	}
+
+	bs, err := ioutil.ReadFile(p)
+	if err != nil {
+		return nil, err
+	}
+
+	err = yaml.Unmarshal(bs, &comments)
+	if err != nil {
+		return nil, err
+	}
+	return comments, nil
+}
+
+// GetPullRequests returns pull requests according page and perPage
+func (r *RepositoryRestorer) GetPullRequests(page, perPage int) ([]*base.PullRequest, bool, error) {
+	var pulls = make([]*base.PullRequest, 0, 10)
+	p := filepath.Join(r.baseDir, "pull_request.yml")
+	_, err := os.Stat(p)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return nil, true, nil
+		}
+		return nil, false, err
+	}
+
+	bs, err := ioutil.ReadFile(p)
+	if err != nil {
+		return nil, false, err
+	}
+
+	err = yaml.Unmarshal(bs, &pulls)
+	if err != nil {
+		return nil, false, err
+	}
+	for _, pr := range pulls {
+		pr.PatchURL = "file://" + filepath.Join(r.baseDir, pr.PatchURL)
+	}
+	return pulls, true, nil
+}
+
+// GetReviews returns pull requests review
+func (r *RepositoryRestorer) GetReviews(pullRequestNumber int64) ([]*base.Review, error) {
+	var reviews = make([]*base.Review, 0, 10)
+	p := filepath.Join(r.reviewDir(), fmt.Sprintf("%d.yml", pullRequestNumber))
+	_, err := os.Stat(p)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return nil, nil
+		}
+		return nil, err
+	}
+
+	bs, err := ioutil.ReadFile(p)
+	if err != nil {
+		return nil, err
+	}
+
+	err = yaml.Unmarshal(bs, &reviews)
+	if err != nil {
+		return nil, err
+	}
+	return reviews, nil
+}