276 lines
8.9 KiB
Go
276 lines
8.9 KiB
Go
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package integration provides end-to-end integration tests for runsc. These
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// tests require docker and runsc to be installed on the machine.
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//
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// Each test calls docker commands to start up a container, and tests that it
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// is behaving properly, with various runsc commands. The container is killed
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// and deleted at the end.
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package integration
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import (
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"fmt"
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"strconv"
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"strings"
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"syscall"
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"testing"
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"time"
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"gvisor.dev/gvisor/pkg/abi/linux"
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"gvisor.dev/gvisor/pkg/bits"
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"gvisor.dev/gvisor/runsc/dockerutil"
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"gvisor.dev/gvisor/runsc/specutils"
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)
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// Test that exec uses the exact same capability set as the container.
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func TestExecCapabilities(t *testing.T) {
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if err := dockerutil.Pull("alpine"); err != nil {
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t.Fatalf("docker pull failed: %v", err)
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}
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d := dockerutil.MakeDocker("exec-capabilities-test")
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// Start the container.
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if err := d.Run("alpine", "sh", "-c", "cat /proc/self/status; sleep 100"); err != nil {
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t.Fatalf("docker run failed: %v", err)
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}
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defer d.CleanUp()
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matches, err := d.WaitForOutputSubmatch("CapEff:\t([0-9a-f]+)\n", 5*time.Second)
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if err != nil {
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t.Fatalf("WaitForOutputSubmatch() timeout: %v", err)
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}
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if len(matches) != 2 {
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t.Fatalf("There should be a match for the whole line and the capability bitmask")
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}
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want := fmt.Sprintf("CapEff:\t%s\n", matches[1])
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t.Log("Root capabilities:", want)
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// Now check that exec'd process capabilities match the root.
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got, err := d.Exec("grep", "CapEff:", "/proc/self/status")
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if err != nil {
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t.Fatalf("docker exec failed: %v", err)
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}
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t.Logf("CapEff: %v", got)
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if got != want {
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t.Errorf("wrong capabilities, got: %q, want: %q", got, want)
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}
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}
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// Test that 'exec --privileged' adds all capabilities, except for CAP_NET_RAW
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// which is removed from the container when --net-raw=false.
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func TestExecPrivileged(t *testing.T) {
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if err := dockerutil.Pull("alpine"); err != nil {
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t.Fatalf("docker pull failed: %v", err)
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}
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d := dockerutil.MakeDocker("exec-privileged-test")
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// Start the container with all capabilities dropped.
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if err := d.Run("--cap-drop=all", "alpine", "sh", "-c", "cat /proc/self/status; sleep 100"); err != nil {
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t.Fatalf("docker run failed: %v", err)
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}
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defer d.CleanUp()
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// Check that all capabilities where dropped from container.
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matches, err := d.WaitForOutputSubmatch("CapEff:\t([0-9a-f]+)\n", 5*time.Second)
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if err != nil {
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t.Fatalf("WaitForOutputSubmatch() timeout: %v", err)
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}
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if len(matches) != 2 {
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t.Fatalf("There should be a match for the whole line and the capability bitmask")
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}
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containerCaps, err := strconv.ParseUint(matches[1], 16, 64)
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if err != nil {
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t.Fatalf("failed to convert capabilities %q: %v", matches[1], err)
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}
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t.Logf("Container capabilities: %#x", containerCaps)
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if containerCaps != 0 {
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t.Fatalf("Container should have no capabilities: %x", containerCaps)
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}
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// Check that 'exec --privileged' adds all capabilities, except
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// for CAP_NET_RAW.
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got, err := d.ExecWithFlags([]string{"--privileged"}, "grep", "CapEff:", "/proc/self/status")
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if err != nil {
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t.Fatalf("docker exec failed: %v", err)
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}
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t.Logf("Exec CapEff: %v", got)
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want := fmt.Sprintf("CapEff:\t%016x\n", specutils.AllCapabilitiesUint64()&^bits.MaskOf64(int(linux.CAP_NET_RAW)))
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if got != want {
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t.Errorf("Wrong capabilities, got: %q, want: %q. Make sure runsc is not using '--net-raw'", got, want)
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}
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}
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func TestExecJobControl(t *testing.T) {
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if err := dockerutil.Pull("alpine"); err != nil {
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t.Fatalf("docker pull failed: %v", err)
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}
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d := dockerutil.MakeDocker("exec-job-control-test")
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// Start the container.
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if err := d.Run("alpine", "sleep", "1000"); err != nil {
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t.Fatalf("docker run failed: %v", err)
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}
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defer d.CleanUp()
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// Exec 'sh' with an attached pty.
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cmd, ptmx, err := d.ExecWithTerminal("sh")
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if err != nil {
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t.Fatalf("docker exec failed: %v", err)
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}
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defer ptmx.Close()
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// Call "sleep 100 | cat" in the shell. We pipe to cat so that there
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// will be two processes in the foreground process group.
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if _, err := ptmx.Write([]byte("sleep 100 | cat\n")); err != nil {
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t.Fatalf("error writing to pty: %v", err)
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}
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// Give shell a few seconds to start executing the sleep.
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time.Sleep(2 * time.Second)
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// Send a ^C to the pty, which should kill sleep and cat, but not the
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// shell. \x03 is ASCII "end of text", which is the same as ^C.
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if _, err := ptmx.Write([]byte{'\x03'}); err != nil {
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t.Fatalf("error writing to pty: %v", err)
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}
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// The shell should still be alive at this point. Sleep should have
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// exited with code 2+128=130. We'll exit with 10 plus that number, so
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// that we can be sure that the shell did not get signalled.
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if _, err := ptmx.Write([]byte("exit $(expr $? + 10)\n")); err != nil {
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t.Fatalf("error writing to pty: %v", err)
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}
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// Exec process should exit with code 10+130=140.
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ps, err := cmd.Process.Wait()
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if err != nil {
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t.Fatalf("error waiting for exec process: %v", err)
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}
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ws := ps.Sys().(syscall.WaitStatus)
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if !ws.Exited() {
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t.Errorf("ws.Exited got false, want true")
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}
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if got, want := ws.ExitStatus(), 140; got != want {
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t.Errorf("ws.ExitedStatus got %d, want %d", got, want)
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}
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}
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// Test that failure to exec returns proper error message.
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func TestExecError(t *testing.T) {
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if err := dockerutil.Pull("alpine"); err != nil {
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t.Fatalf("docker pull failed: %v", err)
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}
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d := dockerutil.MakeDocker("exec-error-test")
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// Start the container.
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if err := d.Run("alpine", "sleep", "1000"); err != nil {
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t.Fatalf("docker run failed: %v", err)
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}
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defer d.CleanUp()
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_, err := d.Exec("no_can_find")
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if err == nil {
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t.Fatalf("docker exec didn't fail")
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}
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if want := `error finding executable "no_can_find" in PATH`; !strings.Contains(err.Error(), want) {
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t.Fatalf("docker exec wrong error, got: %s, want: .*%s.*", err.Error(), want)
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}
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}
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// Test that exec inherits environment from run.
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func TestExecEnv(t *testing.T) {
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if err := dockerutil.Pull("alpine"); err != nil {
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t.Fatalf("docker pull failed: %v", err)
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}
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d := dockerutil.MakeDocker("exec-env-test")
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// Start the container with env FOO=BAR.
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if err := d.Run("-e", "FOO=BAR", "alpine", "sleep", "1000"); err != nil {
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t.Fatalf("docker run failed: %v", err)
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}
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defer d.CleanUp()
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// Exec "echo $FOO".
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got, err := d.Exec("/bin/sh", "-c", "echo $FOO")
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if err != nil {
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t.Fatalf("docker exec failed: %v", err)
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}
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if got, want := strings.TrimSpace(got), "BAR"; got != want {
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t.Errorf("bad output from 'docker exec'. Got %q; Want %q.", got, want)
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}
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}
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// TestRunEnvHasHome tests that run always has HOME environment set.
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func TestRunEnvHasHome(t *testing.T) {
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// Base alpine image does not have any environment variables set.
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if err := dockerutil.Pull("alpine"); err != nil {
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t.Fatalf("docker pull failed: %v", err)
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}
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d := dockerutil.MakeDocker("run-env-test")
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// Exec "echo $HOME". The 'bin' user's home dir is '/bin'.
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got, err := d.RunFg("--user", "bin", "alpine", "/bin/sh", "-c", "echo $HOME")
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if err != nil {
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t.Fatalf("docker run failed: %v", err)
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}
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defer d.CleanUp()
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if got, want := strings.TrimSpace(got), "/bin"; got != want {
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t.Errorf("bad output from 'docker run'. Got %q; Want %q.", got, want)
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}
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}
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// Test that exec always has HOME environment set, even when not set in run.
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func TestExecEnvHasHome(t *testing.T) {
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// Base alpine image does not have any environment variables set.
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if err := dockerutil.Pull("alpine"); err != nil {
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t.Fatalf("docker pull failed: %v", err)
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}
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d := dockerutil.MakeDocker("exec-env-home-test")
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// We will check that HOME is set for root user, and also for a new
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// non-root user we will create.
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newUID := 1234
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newHome := "/foo/bar"
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// Create a new user with a home directory, and then sleep.
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script := fmt.Sprintf(`
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mkdir -p -m 777 %s && \
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adduser foo -D -u %d -h %s && \
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sleep 1000`, newHome, newUID, newHome)
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if err := d.Run("alpine", "/bin/sh", "-c", script); err != nil {
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t.Fatalf("docker run failed: %v", err)
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}
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defer d.CleanUp()
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// Exec "echo $HOME", and expect to see "/root".
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got, err := d.Exec("/bin/sh", "-c", "echo $HOME")
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if err != nil {
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t.Fatalf("docker exec failed: %v", err)
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}
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if want := "/root"; !strings.Contains(got, want) {
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t.Errorf("wanted exec output to contain %q, got %q", want, got)
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}
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// Execute the same as uid 123 and expect newHome.
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got, err = d.ExecAsUser(strconv.Itoa(newUID), "/bin/sh", "-c", "echo $HOME")
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if err != nil {
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t.Fatalf("docker exec failed: %v", err)
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}
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if want := newHome; !strings.Contains(got, want) {
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t.Errorf("wanted exec output to contain %q, got %q", want, got)
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}
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}
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