1 files changed, 256 insertions, 0 deletions
diff --git a/test/e2e/exec_test.go b/test/e2e/exec_test.go
new file mode 100644
index 000000000..88d26e865
--- /dev/null
+++ b/test/e2e/exec_test.go
@@ -0,0 +1,256 @@
+// Copyright 2018 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 integration provides end-to-end integration tests for runsc. These
+// tests require docker and runsc to be installed on the machine.
+//
+// Each test calls docker commands to start up a container, and tests that it
+// is behaving properly, with various runsc commands. The container is killed
+// and deleted at the end.
+
+package integration
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+	"syscall"
+	"testing"
+	"time"
+
+	"gvisor.dev/gvisor/pkg/abi/linux"
+	"gvisor.dev/gvisor/pkg/bits"
+	"gvisor.dev/gvisor/runsc/dockerutil"
+	"gvisor.dev/gvisor/runsc/specutils"
+)
+
+// Test that exec uses the exact same capability set as the container.
+func TestExecCapabilities(t *testing.T) {
+	if err := dockerutil.Pull("alpine"); err != nil {
+		t.Fatalf("docker pull failed: %v", err)
+	}
+	d := dockerutil.MakeDocker("exec-capabilities-test")
+
+	// Start the container.
+	if err := d.Run("alpine", "sh", "-c", "cat /proc/self/status; sleep 100"); err != nil {
+		t.Fatalf("docker run failed: %v", err)
+	}
+	defer d.CleanUp()
+
+	matches, err := d.WaitForOutputSubmatch("CapEff:\t([0-9a-f]+)\n", 5*time.Second)
+	if err != nil {
+		t.Fatalf("WaitForOutputSubmatch() timeout: %v", err)
+	}
+	if len(matches) != 2 {
+		t.Fatalf("There should be a match for the whole line and the capability bitmask")
+	}
+	want := fmt.Sprintf("CapEff:\t%s\n", matches[1])
+	t.Log("Root capabilities:", want)
+
+	// Now check that exec'd process capabilities match the root.
+	got, err := d.Exec("grep", "CapEff:", "/proc/self/status")
+	if err != nil {
+		t.Fatalf("docker exec failed: %v", err)
+	}
+	t.Logf("CapEff: %v", got)
+	if got != want {
+		t.Errorf("wrong capabilities, got: %q, want: %q", got, want)
+	}
+}
+
+// Test that 'exec --privileged' adds all capabilities, except for CAP_NET_RAW
+// which is removed from the container when --net-raw=false.
+func TestExecPrivileged(t *testing.T) {
+	if err := dockerutil.Pull("alpine"); err != nil {
+		t.Fatalf("docker pull failed: %v", err)
+	}
+	d := dockerutil.MakeDocker("exec-privileged-test")
+
+	// Start the container with all capabilities dropped.
+	if err := d.Run("--cap-drop=all", "alpine", "sh", "-c", "cat /proc/self/status; sleep 100"); err != nil {
+		t.Fatalf("docker run failed: %v", err)
+	}
+	defer d.CleanUp()
+
+	// Check that all capabilities where dropped from container.
+	matches, err := d.WaitForOutputSubmatch("CapEff:\t([0-9a-f]+)\n", 5*time.Second)
+	if err != nil {
+		t.Fatalf("WaitForOutputSubmatch() timeout: %v", err)
+	}
+	if len(matches) != 2 {
+		t.Fatalf("There should be a match for the whole line and the capability bitmask")
+	}
+	containerCaps, err := strconv.ParseUint(matches[1], 16, 64)
+	if err != nil {
+		t.Fatalf("failed to convert capabilities %q: %v", matches[1], err)
+	}
+	t.Logf("Container capabilities: %#x", containerCaps)
+	if containerCaps != 0 {
+		t.Fatalf("Container should have no capabilities: %x", containerCaps)
+	}
+
+	// Check that 'exec --privileged' adds all capabilities, except
+	// for CAP_NET_RAW.
+	got, err := d.ExecWithFlags([]string{"--privileged"}, "grep", "CapEff:", "/proc/self/status")
+	if err != nil {
+		t.Fatalf("docker exec failed: %v", err)
+	}
+	t.Logf("Exec CapEff: %v", got)
+	want := fmt.Sprintf("CapEff:\t%016x\n", specutils.AllCapabilitiesUint64()&^bits.MaskOf64(int(linux.CAP_NET_RAW)))
+	if got != want {
+		t.Errorf("wrong capabilities, got: %q, want: %q", got, want)
+	}
+}
+
+func TestExecJobControl(t *testing.T) {
+	if err := dockerutil.Pull("alpine"); err != nil {
+		t.Fatalf("docker pull failed: %v", err)
+	}
+	d := dockerutil.MakeDocker("exec-job-control-test")
+
+	// Start the container.
+	if err := d.Run("alpine", "sleep", "1000"); err != nil {
+		t.Fatalf("docker run failed: %v", err)
+	}
+	defer d.CleanUp()
+
+	// Exec 'sh' with an attached pty.
+	cmd, ptmx, err := d.ExecWithTerminal("sh")
+	if err != nil {
+		t.Fatalf("docker exec failed: %v", err)
+	}
+	defer ptmx.Close()
+
+	// Call "sleep 100 | cat" in the shell.  We pipe to cat so that there
+	// will be two processes in the foreground process group.
+	if _, err := ptmx.Write([]byte("sleep 100 | cat\n")); err != nil {
+		t.Fatalf("error writing to pty: %v", err)
+	}
+
+	// Give shell a few seconds to start executing the sleep.
+	time.Sleep(2 * time.Second)
+
+	// Send a ^C to the pty, which should kill sleep and cat, but not the
+	// shell.  \x03 is ASCII "end of text", which is the same as ^C.
+	if _, err := ptmx.Write([]byte{'\x03'}); err != nil {
+		t.Fatalf("error writing to pty: %v", err)
+	}
+
+	// The shell should still be alive at this point. Sleep should have
+	// exited with code 2+128=130. We'll exit with 10 plus that number, so
+	// that we can be sure that the shell did not get signalled.
+	if _, err := ptmx.Write([]byte("exit $(expr $? + 10)\n")); err != nil {
+		t.Fatalf("error writing to pty: %v", err)
+	}
+
+	// Exec process should exit with code 10+130=140.
+	ps, err := cmd.Process.Wait()
+	if err != nil {
+		t.Fatalf("error waiting for exec process: %v", err)
+	}
+	ws := ps.Sys().(syscall.WaitStatus)
+	if !ws.Exited() {
+		t.Errorf("ws.Exited got false, want true")
+	}
+	if got, want := ws.ExitStatus(), 140; got != want {
+		t.Errorf("ws.ExitedStatus got %d, want %d", got, want)
+	}
+}
+
+// Test that failure to exec returns proper error message.
+func TestExecError(t *testing.T) {
+	if err := dockerutil.Pull("alpine"); err != nil {
+		t.Fatalf("docker pull failed: %v", err)
+	}
+	d := dockerutil.MakeDocker("exec-error-test")
+
+	// Start the container.
+	if err := d.Run("alpine", "sleep", "1000"); err != nil {
+		t.Fatalf("docker run failed: %v", err)
+	}
+	defer d.CleanUp()
+
+	_, err := d.Exec("no_can_find")
+	if err == nil {
+		t.Fatalf("docker exec didn't fail")
+	}
+	if want := `error finding executable "no_can_find" in PATH`; !strings.Contains(err.Error(), want) {
+		t.Fatalf("docker exec wrong error, got: %s, want: .*%s.*", err.Error(), want)
+	}
+}
+
+// Test that exec inherits environment from run.
+func TestExecEnv(t *testing.T) {
+	if err := dockerutil.Pull("alpine"); err != nil {
+		t.Fatalf("docker pull failed: %v", err)
+	}
+	d := dockerutil.MakeDocker("exec-env-test")
+
+	// Start the container with env FOO=BAR.
+	if err := d.Run("-e", "FOO=BAR", "alpine", "sleep", "1000"); err != nil {
+		t.Fatalf("docker run failed: %v", err)
+	}
+	defer d.CleanUp()
+
+	// Exec "echo $FOO".
+	got, err := d.Exec("/bin/sh", "-c", "echo $FOO")
+	if err != nil {
+		t.Fatalf("docker exec failed: %v", err)
+	}
+	if want := "BAR"; !strings.Contains(got, want) {
+		t.Errorf("wanted exec output to contain %q, got %q", want, got)
+	}
+}
+
+// Test that exec always has HOME environment set, even when not set in run.
+func TestExecEnvHasHome(t *testing.T) {
+	// Base alpine image does not have any environment variables set.
+	if err := dockerutil.Pull("alpine"); err != nil {
+		t.Fatalf("docker pull failed: %v", err)
+	}
+	d := dockerutil.MakeDocker("exec-env-home-test")
+
+	// We will check that HOME is set for root user, and also for a new
+	// non-root user we will create.
+	newUID := 1234
+	newHome := "/foo/bar"
+
+	// Create a new user with a home directory, and then sleep.
+	script := fmt.Sprintf(`
+	mkdir -p -m 777 %s && \
+	adduser foo -D -u %d -h %s && \
+	sleep 1000`, newHome, newUID, newHome)
+	if err := d.Run("alpine", "/bin/sh", "-c", script); err != nil {
+		t.Fatalf("docker run failed: %v", err)
+	}
+	defer d.CleanUp()
+
+	// Exec "echo $HOME", and expect to see "/root".
+	got, err := d.Exec("/bin/sh", "-c", "echo $HOME")
+	if err != nil {
+		t.Fatalf("docker exec failed: %v", err)
+	}
+	if want := "/root"; !strings.Contains(got, want) {
+		t.Errorf("wanted exec output to contain %q, got %q", want, got)
+	}
+
+	// Execute the same as uid 123 and expect newHome.
+	got, err = d.ExecAsUser(strconv.Itoa(newUID), "/bin/sh", "-c", "echo $HOME")
+	if err != nil {
+		t.Fatalf("docker exec failed: %v", err)
+	}
+	if want := newHome; !strings.Contains(got, want) {
+		t.Errorf("wanted exec output to contain %q, got %q", want, got)
+	}
+}