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/*
Copyright 2018 The Kubernetes 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 docker
import (
"context"
"io"
"sigs.k8s.io/kind/pkg/exec"
)
// containerCmder implements exec.Cmder for docker containers
type containerCmder struct {
nameOrID string
}
// ContainerCmder creates a new exec.Cmder against a docker container
func ContainerCmder(containerNameOrID string) exec.Cmder {
return &containerCmder{
nameOrID: containerNameOrID,
}
}
func (c *containerCmder) Command(command string, args ...string) exec.Cmd {
return &containerCmd{
nameOrID: c.nameOrID,
command: command,
args: args,
}
}
func (c *containerCmder) CommandContext(ctx context.Context, command string, args ...string) exec.Cmd {
return &containerCmd{
nameOrID: c.nameOrID,
command: command,
args: args,
ctx: ctx,
}
}
// containerCmd implements exec.Cmd for docker containers
type containerCmd struct {
nameOrID string // the container name or ID
command string
args []string
env []string
stdin io.Reader
stdout io.Writer
stderr io.Writer
ctx context.Context
}
func (c *containerCmd) Run() error {
args := []string{
"exec",
// run with privileges so we can remount etc..
// this might not make sense in the most general sense, but it is
// important to many kind commands
"--privileged",
}
if c.stdin != nil {
args = append(args,
"-i", // interactive so we can supply input
)
}
// set env
for _, env := range c.env {
args = append(args, "-e", env)
}
// specify the container and command, after this everything will be
// args the command in the container rather than to docker
args = append(
args,
c.nameOrID, // ... against the container
c.command, // with the command specified
)
args = append(
args,
// finally, with the caller args
c.args...,
)
var cmd exec.Cmd
if c.ctx != nil {
cmd = exec.CommandContext(c.ctx, "docker", args...)
} else {
cmd = exec.Command("docker", args...)
}
if c.stdin != nil {
cmd.SetStdin(c.stdin)
}
if c.stderr != nil {
cmd.SetStderr(c.stderr)
}
if c.stdout != nil {
cmd.SetStdout(c.stdout)
}
return cmd.Run()
}
func (c *containerCmd) SetEnv(env ...string) exec.Cmd {
c.env = env
return c
}
func (c *containerCmd) SetStdin(r io.Reader) exec.Cmd {
c.stdin = r
return c
}
func (c *containerCmd) SetStdout(w io.Writer) exec.Cmd {
c.stdout = w
return c
}
func (c *containerCmd) SetStderr(w io.Writer) exec.Cmd {
c.stderr = w
return c
}
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