| // Copyright 2019 The LUCI Authors. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package main |
| |
| import ( |
| "fmt" |
| "os" |
| |
| "github.com/maruel/subcommands" |
| |
| "go.chromium.org/luci/auth" |
| "go.chromium.org/luci/common/api/gitiles" |
| "go.chromium.org/luci/common/errors" |
| gitilespb "go.chromium.org/luci/common/proto/gitiles" |
| "go.chromium.org/luci/common/retry" |
| "go.chromium.org/luci/common/retry/transient" |
| "go.chromium.org/luci/grpc/grpcutil" |
| ) |
| |
| func cmdDownloadFile(authOpts auth.Options) *subcommands.Command { |
| return &subcommands.Command{ |
| UsageLine: "download-file <options> repository-url committish path", |
| ShortDesc: "prints the contents of the file at path in the repository", |
| LongDesc: "Prints the contents of the file at path in the repository at requested commit.", |
| CommandRun: func() subcommands.CommandRun { |
| c := downloadFileRun{} |
| c.commonFlags.Init(authOpts) |
| return &c |
| }, |
| } |
| } |
| |
| type downloadFileRun struct { |
| commonFlags |
| } |
| |
| func (c *downloadFileRun) Parse(a subcommands.Application, args []string) error { |
| switch err := c.commonFlags.Parse(); { |
| case err != nil: |
| return err |
| case len(args) != 3: |
| return errors.New("exactly 3 position arguments are expected") |
| default: |
| return nil |
| } |
| } |
| |
| func (c *downloadFileRun) main(a subcommands.Application, args []string) error { |
| ctx := c.defaultFlags.MakeLoggingContext(os.Stderr) |
| |
| repoURL := args[0] |
| committish := args[1] |
| path := args[2] |
| |
| host, project, err := gitiles.ParseRepoURL(repoURL) |
| if err != nil { |
| return errors.Annotate(err, "invalid repo URL %q", args[0]).Err() |
| } |
| |
| req := &gitilespb.DownloadFileRequest{ |
| Project: project, |
| Committish: committish, |
| Path: path, |
| } |
| |
| authCl, err := c.createAuthClient() |
| if err != nil { |
| return err |
| } |
| g, err := gitiles.NewRESTClient(authCl, host, true) |
| if err != nil { |
| return err |
| } |
| |
| var res *gitilespb.DownloadFileResponse |
| if err := retry.Retry(ctx, transient.Only(retry.Default), func() error { |
| var err error |
| res, err = g.DownloadFile(ctx, req) |
| return grpcutil.WrapIfTransient(err) |
| }, nil); err != nil { |
| return err |
| } |
| |
| if res.Contents == "" { |
| fmt.Fprintf(a.GetErr(), "warning: file %s is empty", path) |
| } |
| fmt.Fprintf(a.GetOut(), "%s", res.Contents) |
| return nil |
| } |
| |
| func (c *downloadFileRun) Run(a subcommands.Application, args []string, _ subcommands.Env) int { |
| if err := c.Parse(a, args); err != nil { |
| fmt.Fprintf(a.GetErr(), "%s: %s\n", a.GetName(), err) |
| return 1 |
| } |
| if err := c.main(a, args); err != nil { |
| fmt.Fprintf(a.GetErr(), "%s: %s\n", a.GetName(), err) |
| return 1 |
| } |
| return 0 |
| } |