InitCommand() robustness (#327)

fixes #320

Co-authored-by: Norwin Roosen <git@nroo.de>
Reviewed-on: https://gitea.com/gitea/tea/pulls/327
Reviewed-by: Andrew Thornton <art27@cantab.net>
Reviewed-by: 6543 <6543@obermui.de>
Co-authored-by: Norwin <noerw@noreply.gitea.io>
Co-committed-by: Norwin <noerw@noreply.gitea.io>

modules/context/context.go

@@ -75,13 +75,16 @@ func InitCommand(ctx *cli.Context) *TeaContext {
 	loginFlag := ctx.String("login")
 	remoteFlag := ctx.String("remote")
 
-	var repoSlug string
-	var repoPath string // empty means PWD
-	var repoFlagPathExists bool
+	var (
+		c                  TeaContext
+		err                error
+		repoPath           string // empty means PWD
+		repoFlagPathExists bool
+	)
 
 	// check if repoFlag can be interpreted as path to local repo.
 	if len(repoFlag) != 0 {
-		repoFlagPathExists, err := utils.PathExists(repoFlag)
+		repoFlagPathExists, err = utils.DirExists(repoFlag)
 		if err != nil {
 			log.Fatal(err.Error())
 		}
@@ -90,38 +93,42 @@ func InitCommand(ctx *cli.Context) *TeaContext {
 		}
 	}
 
+	if len(repoFlag) == 0 || repoFlagPathExists {
 		// try to read git repo & extract context, ignoring if PWD is not a repo
-	localRepo, login, repoSlug, err := contextFromLocalRepo(repoPath, remoteFlag)
+		c.LocalRepo, c.Login, c.RepoSlug, err = contextFromLocalRepo(repoPath, remoteFlag)
 		if err != nil && err != gogit.ErrRepositoryNotExists {
 			log.Fatal(err.Error())
 		}
+	}
 
-	// if repoFlag is not a path, use it to override repoSlug
 	if len(repoFlag) != 0 && !repoFlagPathExists {
-		repoSlug = repoFlag
+		// if repoFlag is not a valid path, use it to override repoSlug
+		c.RepoSlug = repoFlag
 	}
 
 	// override login from flag, or use default login if repo based detection failed
 	if len(loginFlag) != 0 {
-		login = config.GetLoginByName(loginFlag)
-		if login == nil {
+		c.Login = config.GetLoginByName(loginFlag)
+		if c.Login == nil {
 			log.Fatalf("Login name '%s' does not exist", loginFlag)
 		}
-	} else if login == nil {
-		if login, err = config.GetDefaultLogin(); err != nil {
+	} else if c.Login == nil {
+		if c.Login, err = config.GetDefaultLogin(); err != nil {
 			log.Fatal(err.Error())
 		}
 	}
 
 	// parse reposlug (owner falling back to login owner if reposlug contains only repo name)
-	owner, reponame := utils.GetOwnerAndRepo(repoSlug, login.User)
+	c.Owner, c.Repo = utils.GetOwnerAndRepo(c.RepoSlug, c.Login.User)
 
-	return &TeaContext{ctx, login, repoSlug, owner, reponame, ctx.String("output"), localRepo}
+	c.Context = ctx
+	c.Output = ctx.String("output")
+	return &c
 }
 
 // contextFromLocalRepo discovers login & repo slug from the default branch remote of the given local repo
-func contextFromLocalRepo(repoValue, remoteValue string) (*git.TeaRepo, *config.Login, string, error) {
-	repo, err := git.RepoFromPath(repoValue)
+func contextFromLocalRepo(repoPath, remoteValue string) (*git.TeaRepo, *config.Login, string, error) {
+	repo, err := git.RepoFromPath(repoPath)
 	if err != nil {
 		return nil, nil, "", err
 	}

modules/utils/path.go

@@ -26,15 +26,31 @@ func PathExists(path string) (bool, error) {
 
 // FileExist returns whether the given file exists or not
 func FileExist(fileName string) (bool, error) {
-	f, err := os.Stat(fileName)
+	return exists(fileName, false)
+}
+
+// DirExists returns whether the given file exists or not
+func DirExists(path string) (bool, error) {
+	return exists(path, true)
+}
+
+func exists(path string, expectDir bool) (bool, error) {
+	f, err := os.Stat(path)
 	if err != nil {
-		if os.IsNotExist(err) {
+		if errors.Is(err, os.ErrNotExist) {
+			return false, nil
+		} else if err.(*os.PathError).Err.Error() == "not a directory" {
+			// some middle segment of path is a file, cannot traverse
+			// FIXME: catches error on linux; go does not provide a way to catch this properly..
 			return false, nil
 		}
 		return false, err
 	}
-	if f.IsDir() {
+	isDir := f.IsDir()
+	if isDir && !expectDir {
 		return false, errors.New("A directory with the same name exists")
+	} else if !isDir && expectDir {
+		return false, errors.New("A file with the same name exists")
 	}
 	return true, nil
 }