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// Copyright 2020 The gVisor 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 dockerutil
import (
"bytes"
"context"
"fmt"
"time"
"github.com/docker/docker/api/types"
"github.com/docker/docker/pkg/stdcopy"
)
// ExecOpts holds arguments for Exec calls.
type ExecOpts struct {
// Env are additional environment variables.
Env []string
// Privileged enables privileged mode.
Privileged bool
// User is the user to use.
User string
// Enables Tty and stdin for the created process.
UseTTY bool
// WorkDir is the working directory of the process.
WorkDir string
}
// Exec creates a process inside the container.
func (c *Container) Exec(ctx context.Context, opts ExecOpts, args ...string) (string, error) {
p, err := c.doExec(ctx, opts, args)
if err != nil {
return "", err
}
if exitStatus, err := p.WaitExitStatus(ctx); err != nil {
return "", err
} else if exitStatus != 0 {
out, _ := p.Logs()
return out, fmt.Errorf("process terminated with status: %d", exitStatus)
}
return p.Logs()
}
// ExecProcess creates a process inside the container and returns a process struct
// for the caller to use.
func (c *Container) ExecProcess(ctx context.Context, opts ExecOpts, args ...string) (Process, error) {
return c.doExec(ctx, opts, args)
}
func (c *Container) doExec(ctx context.Context, r ExecOpts, args []string) (Process, error) {
config := c.execConfig(r, args)
resp, err := c.client.ContainerExecCreate(ctx, c.id, config)
if err != nil {
return Process{}, fmt.Errorf("exec create failed with err: %v", err)
}
hijack, err := c.client.ContainerExecAttach(ctx, resp.ID, types.ExecStartCheck{})
if err != nil {
return Process{}, fmt.Errorf("exec attach failed with err: %v", err)
}
if err := c.client.ContainerExecStart(ctx, resp.ID, types.ExecStartCheck{}); err != nil {
hijack.Close()
return Process{}, fmt.Errorf("exec start failed with err: %v", err)
}
return Process{
container: c,
execid: resp.ID,
conn: hijack,
}, nil
}
func (c *Container) execConfig(r ExecOpts, cmd []string) types.ExecConfig {
env := append(r.Env, fmt.Sprintf("RUNSC_TEST_NAME=%s", c.Name))
return types.ExecConfig{
AttachStdin: r.UseTTY,
AttachStderr: true,
AttachStdout: true,
Cmd: cmd,
Privileged: r.Privileged,
WorkingDir: r.WorkDir,
Env: env,
Tty: r.UseTTY,
User: r.User,
}
}
// Process represents a containerized process.
type Process struct {
container *Container
execid string
conn types.HijackedResponse
}
// Write writes buf to the process's stdin.
func (p *Process) Write(timeout time.Duration, buf []byte) (int, error) {
p.conn.Conn.SetDeadline(time.Now().Add(timeout))
return p.conn.Conn.Write(buf)
}
// Read returns process's stdout and stderr.
func (p *Process) Read() (string, string, error) {
var stdout, stderr bytes.Buffer
if err := p.read(&stdout, &stderr); err != nil {
return "", "", err
}
return stdout.String(), stderr.String(), nil
}
// Logs returns combined stdout/stderr from the process.
func (p *Process) Logs() (string, error) {
var out bytes.Buffer
if err := p.read(&out, &out); err != nil {
return "", err
}
return out.String(), nil
}
func (p *Process) read(stdout, stderr *bytes.Buffer) error {
_, err := stdcopy.StdCopy(stdout, stderr, p.conn.Reader)
return err
}
// ExitCode returns the process's exit code.
func (p *Process) ExitCode(ctx context.Context) (int, error) {
_, exitCode, err := p.runningExitCode(ctx)
return exitCode, err
}
// IsRunning checks if the process is running.
func (p *Process) IsRunning(ctx context.Context) (bool, error) {
running, _, err := p.runningExitCode(ctx)
return running, err
}
// WaitExitStatus until process completes and returns exit status.
func (p *Process) WaitExitStatus(ctx context.Context) (int, error) {
waitChan := make(chan (int))
errChan := make(chan (error))
go func() {
for {
running, exitcode, err := p.runningExitCode(ctx)
if err != nil {
errChan <- fmt.Errorf("error waiting process %s: container %v", p.execid, p.container.Name)
}
if !running {
waitChan <- exitcode
}
time.Sleep(time.Millisecond * 500)
}
}()
select {
case ws := <-waitChan:
return ws, nil
case err := <-errChan:
return -1, err
}
}
// runningExitCode collects if the process is running and the exit code.
// The exit code is only valid if the process has exited.
func (p *Process) runningExitCode(ctx context.Context) (bool, int, error) {
// If execid is not empty, this is a execed process.
if p.execid != "" {
status, err := p.container.client.ContainerExecInspect(ctx, p.execid)
return status.Running, status.ExitCode, err
}
// else this is the root process.
status, err := p.container.Status(ctx)
return status.Running, status.ExitCode, err
}
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