fix #1169

- prevent create reop on existed path

models/repo.go

 
 // InitRepository initializes README and .gitignore if needed.
 func initRepository(e Engine, repoPath string, u *User, repo *Repository, initReadme bool, repoLang, license string) error {
+	// Somehow the directory could exist.
+	if com.IsExist(repoPath) {
+		return fmt.Errorf("initRepository: path already exists: %s", repoPath)
+	}
+
 	// Init bare new repository.
 	os.MkdirAll(repoPath, os.ModePerm)
 	_, stderr, err := process.ExecDir(-1, repoPath,
 		fmt.Sprintf("initRepository(git init --bare): %s", repoPath),
 		"git", "init", "--bare")
 	if err != nil {
-		return errors.New("git init --bare: " + stderr)
+		return fmt.Errorf("git init --bare: %s", err)
 	}
 
 	if err := createUpdateHook(repoPath); err != nil {

modules/git/repo_tag.go

 	}
 	stdout, stderr, err := com.ExecCmdDir(repo.Path, "git", "tag", "-l")
 	if err != nil {
-		return nil, errors.New(stderr)
+		return nil, concatenateError(err, stderr)
 	}
 	tags := strings.Split(stdout, "\n")
 	return tags[:len(tags)-1], nil

modules/git/utils.go

 import (
 	"bytes"
 	"container/list"
+	"fmt"
 	"os"
 	"path/filepath"
 	"strings"
 	}
 	return !f.IsDir()
 }
+
+func concatenateError(err error, stderr string) error {
+	if len(stderr) == 0 {
+		return err
+	}
+	return fmt.Errorf("%v: %s", err, stderr)
+}

modules/middleware/org.go

 		org := ctx.Org.Organization
 		ctx.Data["Org"] = org
 
+		// Force redirection when username is actually a user.
+		if !org.IsOrganization() {
+			ctx.Redirect("/" + org.Name)
+			return
+		}
+
 		if ctx.IsSigned {
 			ctx.Org.IsOwner = org.IsOwnedBy(ctx.User.Id)
 			if ctx.Org.IsOwner {