github.com/bazelbuild/bazel-gazelle@v0.36.1-0.20240520142334-61b277ba6fed/cmd/fetch_repo/vcs.go (about)

     1  /* Copyright 2019 The Bazel Authors. All rights reserved.
     2  
     3  Licensed under the Apache License, Version 2.0 (the "License");
     4  you may not use this file except in compliance with the License.
     5  You may obtain a copy of the License at
     6  
     7     http://www.apache.org/licenses/LICENSE-2.0
     8  
     9  Unless required by applicable law or agreed to in writing, software
    10  distributed under the License is distributed on an "AS IS" BASIS,
    11  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  See the License for the specific language governing permissions and
    13  limitations under the License.
    14  */
    15  
    16  package main
    17  
    18  import (
    19  	"fmt"
    20  
    21  	"golang.org/x/tools/go/vcs"
    22  )
    23  
    24  func fetchRepo(dest, remote, cmd, importpath, rev string) error {
    25  	root, err := getRepoRoot(remote, cmd, importpath)
    26  	if err != nil {
    27  		return err
    28  	}
    29  	return root.VCS.CreateAtRev(dest, root.Repo, rev)
    30  }
    31  
    32  func getRepoRoot(remote, cmd, importpath string) (*vcs.RepoRoot, error) {
    33  	if (cmd == "") != (remote == "") {
    34  		return nil, fmt.Errorf("--remote should be used with the --vcs flag. If this is an import path, use --importpath instead.")
    35  	}
    36  
    37  	if cmd != "" && remote != "" {
    38  		v := vcs.ByCmd(cmd)
    39  		if v == nil {
    40  			return nil, fmt.Errorf("invalid VCS type: %s", cmd)
    41  		}
    42  		return &vcs.RepoRoot{
    43  			VCS:  v,
    44  			Repo: remote,
    45  			Root: importpath,
    46  		}, nil
    47  	}
    48  
    49  	// User did not give us complete information for VCS / Remote.
    50  	// Try to figure out the information from the import path.
    51  	verbose := false
    52  	r, err := repoRootForImportPath(importpath, verbose)
    53  	if err != nil {
    54  		return nil, err
    55  	}
    56  	if importpath != r.Root {
    57  		return nil, fmt.Errorf("not a root of a repository: %s", importpath)
    58  	}
    59  	return r, nil
    60  }