218 lines
6.7 KiB
Go
218 lines
6.7 KiB
Go
// build +linux
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package main
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import (
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"bufio"
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"fmt"
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"io/ioutil"
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"os"
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"strings"
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"github.com/docker/docker/api/types"
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"github.com/docker/docker/api/types/container"
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"github.com/docker/docker/integration-cli/checker"
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"github.com/docker/docker/integration-cli/cli"
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"github.com/docker/docker/integration-cli/request"
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"github.com/go-check/check"
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"golang.org/x/net/context"
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)
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/* testIpcCheckDevExists checks whether a given mount (identified by its
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* major:minor pair from /proc/self/mountinfo) exists on the host system.
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*
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* The format of /proc/self/mountinfo is like:
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*
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* 29 23 0:24 / /dev/shm rw,nosuid,nodev shared:4 - tmpfs tmpfs rw
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* ^^^^\
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* - this is the minor:major we look for
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*/
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func testIpcCheckDevExists(mm string) (bool, error) {
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f, err := os.Open("/proc/self/mountinfo")
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if err != nil {
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return false, err
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}
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defer f.Close()
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s := bufio.NewScanner(f)
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for s.Scan() {
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fields := strings.Fields(s.Text())
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if len(fields) < 7 {
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continue
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}
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if fields[2] == mm {
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return true, nil
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}
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}
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return false, s.Err()
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}
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// testIpcNonePrivateShareable is a helper function to test "none",
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// "private" and "shareable" modes.
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func testIpcNonePrivateShareable(c *check.C, mode string, mustBeMounted bool, mustBeShared bool) {
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cfg := container.Config{
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Image: "busybox",
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Cmd: []string{"top"},
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}
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hostCfg := container.HostConfig{
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IpcMode: container.IpcMode(mode),
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}
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ctx := context.Background()
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client, err := request.NewClient()
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c.Assert(err, checker.IsNil)
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resp, err := client.ContainerCreate(ctx, &cfg, &hostCfg, nil, "")
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c.Assert(err, checker.IsNil)
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c.Assert(len(resp.Warnings), checker.Equals, 0)
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err = client.ContainerStart(ctx, resp.ID, types.ContainerStartOptions{})
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c.Assert(err, checker.IsNil)
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// get major:minor pair for /dev/shm from container's /proc/self/mountinfo
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cmd := "awk '($5 == \"/dev/shm\") {printf $3}' /proc/self/mountinfo"
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mm := cli.DockerCmd(c, "exec", "-i", resp.ID, "sh", "-c", cmd).Combined()
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if !mustBeMounted {
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c.Assert(mm, checker.Equals, "")
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// no more checks to perform
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return
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}
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c.Assert(mm, checker.Matches, "^[0-9]+:[0-9]+$")
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shared, err := testIpcCheckDevExists(mm)
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c.Assert(err, checker.IsNil)
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c.Logf("[testIpcPrivateShareable] ipcmode: %v, ipcdev: %v, shared: %v, mustBeShared: %v\n", mode, mm, shared, mustBeShared)
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c.Assert(shared, checker.Equals, mustBeShared)
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}
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/* TestAPIIpcModeNone checks the container "none" IPC mode
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* (--ipc none) works as expected. It makes sure there is no
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* /dev/shm mount inside the container.
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*/
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func (s *DockerSuite) TestAPIIpcModeNone(c *check.C) {
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testRequires(c, DaemonIsLinux)
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testIpcNonePrivateShareable(c, "none", false, false)
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}
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/* TestAPIIpcModePrivate checks the container private IPC mode
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* (--ipc private) works as expected. It gets the minor:major pair
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* of /dev/shm mount from the container, and makes sure there is no
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* such pair on the host.
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*/
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func (s *DockerSuite) TestAPIIpcModePrivate(c *check.C) {
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testRequires(c, DaemonIsLinux, SameHostDaemon)
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testIpcNonePrivateShareable(c, "private", true, false)
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}
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/* TestAPIIpcModeShareable checks the container shareable IPC mode
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* (--ipc shareable) works as expected. It gets the minor:major pair
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* of /dev/shm mount from the container, and makes sure such pair
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* also exists on the host.
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*/
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func (s *DockerSuite) TestAPIIpcModeShareable(c *check.C) {
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testRequires(c, DaemonIsLinux, SameHostDaemon)
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testIpcNonePrivateShareable(c, "shareable", true, true)
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}
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// testIpcContainer is a helper function to test --ipc container:NNN mode in various scenarios
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func testIpcContainer(s *DockerSuite, c *check.C, donorMode string, mustWork bool) {
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cfg := container.Config{
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Image: "busybox",
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Cmd: []string{"top"},
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}
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hostCfg := container.HostConfig{
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IpcMode: container.IpcMode(donorMode),
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}
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ctx := context.Background()
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client, err := request.NewClient()
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c.Assert(err, checker.IsNil)
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// create and start the "donor" container
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resp, err := client.ContainerCreate(ctx, &cfg, &hostCfg, nil, "")
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c.Assert(err, checker.IsNil)
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c.Assert(len(resp.Warnings), checker.Equals, 0)
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name1 := resp.ID
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err = client.ContainerStart(ctx, name1, types.ContainerStartOptions{})
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c.Assert(err, checker.IsNil)
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// create and start the second container
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hostCfg.IpcMode = container.IpcMode("container:" + name1)
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resp, err = client.ContainerCreate(ctx, &cfg, &hostCfg, nil, "")
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c.Assert(err, checker.IsNil)
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c.Assert(len(resp.Warnings), checker.Equals, 0)
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name2 := resp.ID
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err = client.ContainerStart(ctx, name2, types.ContainerStartOptions{})
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if !mustWork {
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// start should fail with a specific error
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c.Assert(err, checker.NotNil)
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c.Assert(fmt.Sprintf("%v", err), checker.Contains, "non-shareable IPC")
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// no more checks to perform here
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return
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}
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// start should succeed
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c.Assert(err, checker.IsNil)
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// check that IPC is shared
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// 1. create a file in the first container
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cli.DockerCmd(c, "exec", name1, "sh", "-c", "printf covfefe > /dev/shm/bar")
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// 2. check it's the same file in the second one
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out := cli.DockerCmd(c, "exec", "-i", name2, "cat", "/dev/shm/bar").Combined()
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c.Assert(out, checker.Matches, "^covfefe$")
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}
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/* TestAPIIpcModeShareableAndContainer checks that a container created with
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* --ipc container:ID can use IPC of another shareable container.
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*/
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func (s *DockerSuite) TestAPIIpcModeShareableAndContainer(c *check.C) {
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testRequires(c, DaemonIsLinux)
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testIpcContainer(s, c, "shareable", true)
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}
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/* TestAPIIpcModePrivateAndContainer checks that a container created with
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* --ipc container:ID can NOT use IPC of another private container.
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*/
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func (s *DockerSuite) TestAPIIpcModePrivateAndContainer(c *check.C) {
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testRequires(c, DaemonIsLinux)
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testIpcContainer(s, c, "private", false)
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}
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/* TestAPIIpcModeHost checks that a container created with --ipc host
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* can use IPC of the host system.
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*/
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func (s *DockerSuite) TestAPIIpcModeHost(c *check.C) {
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testRequires(c, DaemonIsLinux, SameHostDaemon, NotUserNamespace)
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cfg := container.Config{
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Image: "busybox",
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Cmd: []string{"top"},
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}
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hostCfg := container.HostConfig{
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IpcMode: container.IpcMode("host"),
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}
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ctx := context.Background()
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client, err := request.NewClient()
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c.Assert(err, checker.IsNil)
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resp, err := client.ContainerCreate(ctx, &cfg, &hostCfg, nil, "")
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c.Assert(err, checker.IsNil)
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c.Assert(len(resp.Warnings), checker.Equals, 0)
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name := resp.ID
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err = client.ContainerStart(ctx, name, types.ContainerStartOptions{})
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c.Assert(err, checker.IsNil)
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// check that IPC is shared
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// 1. create a file inside container
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cli.DockerCmd(c, "exec", name, "sh", "-c", "printf covfefe > /dev/shm/."+name)
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// 2. check it's the same on the host
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bytes, err := ioutil.ReadFile("/dev/shm/." + name)
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c.Assert(err, checker.IsNil)
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c.Assert(string(bytes), checker.Matches, "^covfefe$")
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// 3. clean up
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cli.DockerCmd(c, "exec", name, "rm", "-f", "/dev/shm/."+name)
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}
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