git: migrate to github.com/gogs/git-module@v1.0.0 (#5958)

* WIP

* Finish `internal/db/git_diff.go`

* FInish internal/db/mirror.go

* Finish internal/db/pull.go

* Finish internal/db/release.go

* Finish internal/db/repo.go

* Finish internal/db/repo_branch.go

* Finish internal/db/repo_editor.go

* Finish internal/db/update.go

* Save my work

* Add license header

* Compile!

* Merge master

* Finish internal/cmd/hook.go

* Finish internal/conf/static.go

* Finish internal/context/repo.go

* Finish internal/db/action.go

* Finish internal/db/git_diff.go

* Fix submodule URL inferring

* Finish internal/db/mirror.go

* Updat to beta.4

* css: update fonts

* Finish internal/db/pull.go

* Finish internal/db/release.go

* Finish internal/db/repo_branch.go

* Finish internal/db/wiki.go

* gitutil: enhance infer submodule UR

* Finish internal/route/api/v1/repo/commits.go

* mirror: only collect branch commits after sync

* mirror: fix tag support

* Finish internal/db/repo.go

* Finish internal/db/repo_editor.go

* Finish internal/db/update.go

* Finish internal/gitutil/pull_request.go

* Make it compile

* Finish internal/route/repo/setting.go

* Finish internal/route/repo/branch.go

* Finish internal/route/api/v1/repo/file.go

* Finish internal/route/repo/download.go

* Finish internal/route/repo/editor.go

* Use helper

* Finish internal/route/repo/issue.go

* Finish internal/route/repo/pull.go

* Finish internal/route/repo/release.go

* Finish internal/route/repo/repo.go

* Finish internal/route/repo/wiki.go

* Finish internal/route/repo/commit.go

* Finish internal/route/repo/view.go

* Finish internal/gitutil/tag.go

* go.sum

1 files changed, 5 insertions, 14 deletions

diff --git a/internal/route/repo/issue.go b/internal/route/repo/issue.go
index 5495402a..fea9af98 100644
--- a/internal/route/repo/issue.go
+++ b/internal/route/repo/issue.go
@@ -6,8 +6,6 @@ package repo
 
 import (
 	"fmt"
-	"io"
-	"io/ioutil"
 	"net/http"
 	"net/url"
 	"strings"
@@ -303,30 +301,23 @@ func RetrieveRepoMetas(c *context.Context, repo *db.Repository) []*db.Label {
 }
 
 func getFileContentFromDefaultBranch(c *context.Context, filename string) (string, bool) {
-	var r io.Reader
-	var bytes []byte
-
 	if c.Repo.Commit == nil {
 		var err error
-		c.Repo.Commit, err = c.Repo.GitRepo.GetBranchCommit(c.Repo.Repository.DefaultBranch)
+		c.Repo.Commit, err = c.Repo.GitRepo.BranchCommit(c.Repo.Repository.DefaultBranch)
 		if err != nil {
 			return "", false
 		}
 	}
 
-	entry, err := c.Repo.Commit.GetTreeEntryByPath(filename)
-	if err != nil {
-		return "", false
-	}
-	r, err = entry.Blob().Data()
+	entry, err := c.Repo.Commit.TreeEntry(filename)
 	if err != nil {
 		return "", false
 	}
-	bytes, err = ioutil.ReadAll(r)
+	p, err := entry.Blob().Bytes()
 	if err != nil {
 		return "", false
 	}
-	return string(bytes), true
+	return string(p), true
 }
 
 func setTemplateIfExists(c *context.Context, ctxDataKey string, possibleFiles []string) {
@@ -656,7 +647,7 @@ func viewIssue(c *context.Context, isPullList bool) {
 		}
 
 		c.Data["IsPullBranchDeletable"] = pull.BaseRepoID == pull.HeadRepoID &&
-			c.Repo.IsWriter() && c.Repo.GitRepo.IsBranchExist(pull.HeadBranch) &&
+			c.Repo.IsWriter() && c.Repo.GitRepo.HasBranch(pull.HeadBranch) &&
 			!branchProtected
 
 		c.Data["DeleteBranchLink"] = c.Repo.MakeURL(url.URL{