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gcr-login.go
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gcr-login.go
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// Copyright 2016 Google, Inc.
//
// 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 cli
import (
"context"
"flag"
"fmt"
"os"
"github.com/GoogleCloudPlatform/docker-credential-gcr/auth"
"github.com/GoogleCloudPlatform/docker-credential-gcr/store"
"github.com/google/subcommands"
)
type loginCmd struct {
cmd
forbidBrowser bool // whether automatic browser execution should be forbidden
}
// NewGCRLoginSubcommand returns a subcommands.Command which implements the GCR
// login operation.
func NewGCRLoginSubcommand() subcommands.Command {
return &loginCmd{
cmd{
name: "gcr-login",
synopsis: "log in to GCR",
},
false,
}
}
func (c *loginCmd) SetFlags(fs *flag.FlagSet) {
fs.BoolVar(&c.forbidBrowser, "no-browser", false, "forbid automatic browser launch")
}
func (c *loginCmd) Execute(context.Context, *flag.FlagSet, ...interface{}) subcommands.ExitStatus {
if err := c.GCRLogin(); err != nil {
fmt.Fprintf(os.Stderr, "Login failure: %v\n", err)
return subcommands.ExitFailure
}
return subcommands.ExitSuccess
}
// GCRLogin performs the actions necessary to generate a GCR access token
// and persist it for later use.
func (c *loginCmd) GCRLogin() error {
loginAgent := &auth.GCRLoginAgent{
AllowBrowser: !c.forbidBrowser,
}
s, err := store.NewGCRCredStore()
if err != nil {
return err
}
tok, err := loginAgent.PerformLogin()
if err != nil {
return fmt.Errorf("unable to authenticate user: %v", err)
}
if err = s.SetGCRAuth(tok); err != nil {
return fmt.Errorf("unable to persist access token: %v", err)
}
return nil
}