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package daemon // import "github.com/docker/docker/daemon"
import (
"os"
"path/filepath"
"testing"
containertypes "github.com/docker/docker/api/types/container"
"github.com/docker/docker/container"
"github.com/docker/docker/daemon/config"
"github.com/docker/docker/daemon/network"
"github.com/docker/docker/pkg/containerfs"
"github.com/docker/docker/pkg/idtools"
"github.com/docker/libnetwork"
"gotest.tools/v3/assert"
is "gotest.tools/v3/assert/cmp"
"gotest.tools/v3/skip"
)
func setupFakeDaemon(t *testing.T, c *container.Container) *Daemon {
root, err := os.MkdirTemp("", "oci_linux_test-root")
assert.NilError(t, err)
rootfs := filepath.Join(root, "rootfs")
err = os.MkdirAll(rootfs, 0755)
assert.NilError(t, err)
netController, err := libnetwork.New()
assert.NilError(t, err)
d := &Daemon{
// some empty structs to avoid getting a panic
// caused by a null pointer dereference
idMapping: &idtools.IdentityMapping{},
configStore: &config.Config{},
linkIndex: newLinkIndex(),
netController: netController,
}
c.Root = root
c.BaseFS = containerfs.NewLocalContainerFS(rootfs)
if c.Config == nil {
c.Config = new(containertypes.Config)
}
if c.HostConfig == nil {
c.HostConfig = new(containertypes.HostConfig)
}
if c.NetworkSettings == nil {
c.NetworkSettings = &network.Settings{Networks: make(map[string]*network.EndpointSettings)}
}
return d
}
func cleanupFakeContainer(c *container.Container) {
_ = os.RemoveAll(c.Root)
}
// TestTmpfsDevShmNoDupMount checks that a user-specified /dev/shm tmpfs
// mount (as in "docker run --tmpfs /dev/shm:rw,size=NNN") does not result
// in "Duplicate mount point" error from the engine.
// https://github.com/moby/moby/issues/35455
func TestTmpfsDevShmNoDupMount(t *testing.T) {
skip.If(t, os.Getuid() != 0, "skipping test that requires root")
c := &container.Container{
ShmPath: "foobar", // non-empty, for c.IpcMounts() to work
HostConfig: &containertypes.HostConfig{
IpcMode: containertypes.IpcMode("shareable"), // default mode
// --tmpfs /dev/shm:rw,exec,size=NNN
Tmpfs: map[string]string{
"/dev/shm": "rw,exec,size=1g",
},
},
}
d := setupFakeDaemon(t, c)
defer cleanupFakeContainer(c)
_, err := d.createSpec(c)
assert.Check(t, err)
}
// TestIpcPrivateVsReadonly checks that in case of IpcMode: private
// and ReadonlyRootfs: true (as in "docker run --ipc private --read-only")
// the resulting /dev/shm mount is NOT made read-only.
// https://github.com/moby/moby/issues/36503
func TestIpcPrivateVsReadonly(t *testing.T) {
skip.If(t, os.Getuid() != 0, "skipping test that requires root")
c := &container.Container{
HostConfig: &containertypes.HostConfig{
IpcMode: containertypes.IpcMode("private"),
ReadonlyRootfs: true,
},
}
d := setupFakeDaemon(t, c)
defer cleanupFakeContainer(c)
s, err := d.createSpec(c)
assert.Check(t, err)
// Find the /dev/shm mount in ms, check it does not have ro
for _, m := range s.Mounts {
if m.Destination != "/dev/shm" {
continue
}
assert.Check(t, is.Equal(false, inSlice(m.Options, "ro")))
}
}
// TestSysctlOverride ensures that any implicit sysctls (such as
// Config.Domainname) are overridden by an explicit sysctl in the HostConfig.
func TestSysctlOverride(t *testing.T) {
skip.If(t, os.Getuid() != 0, "skipping test that requires root")
c := &container.Container{
Config: &containertypes.Config{
Hostname: "foobar",
Domainname: "baz.cyphar.com",
},
HostConfig: &containertypes.HostConfig{
NetworkMode: "bridge",
Sysctls: map[string]string{},
},
}
d := setupFakeDaemon(t, c)
defer cleanupFakeContainer(c)
// Ensure that the implicit sysctl is set correctly.
s, err := d.createSpec(c)
assert.NilError(t, err)
assert.Equal(t, s.Hostname, "foobar")
assert.Equal(t, s.Linux.Sysctl["kernel.domainname"], c.Config.Domainname)
if sysctlExists("net.ipv4.ip_unprivileged_port_start") {
assert.Equal(t, s.Linux.Sysctl["net.ipv4.ip_unprivileged_port_start"], "0")
}
if sysctlExists("net.ipv4.ping_group_range") {
assert.Equal(t, s.Linux.Sysctl["net.ipv4.ping_group_range"], "0 2147483647")
}
// Set an explicit sysctl.
c.HostConfig.Sysctls["kernel.domainname"] = "foobar.net"
assert.Assert(t, c.HostConfig.Sysctls["kernel.domainname"] != c.Config.Domainname)
c.HostConfig.Sysctls["net.ipv4.ip_unprivileged_port_start"] = "1024"
s, err = d.createSpec(c)
assert.NilError(t, err)
assert.Equal(t, s.Hostname, "foobar")
assert.Equal(t, s.Linux.Sysctl["kernel.domainname"], c.HostConfig.Sysctls["kernel.domainname"])
assert.Equal(t, s.Linux.Sysctl["net.ipv4.ip_unprivileged_port_start"], c.HostConfig.Sysctls["net.ipv4.ip_unprivileged_port_start"])
// Ensure the ping_group_range is not set on a daemon with user-namespaces enabled
d.configStore.RemappedRoot = "dummy:dummy"
s, err = d.createSpec(c)
assert.NilError(t, err)
_, ok := s.Linux.Sysctl["net.ipv4.ping_group_range"]
assert.Assert(t, !ok)
// Ensure the ping_group_range is set on a container in "host" userns mode
// on a daemon with user-namespaces enabled
c.HostConfig.UsernsMode = "host"
s, err = d.createSpec(c)
assert.NilError(t, err)
assert.Equal(t, s.Linux.Sysctl["net.ipv4.ping_group_range"], "0 2147483647")
}
// TestSysctlOverrideHost ensures that any implicit network sysctls are not set
// with host networking
func TestSysctlOverrideHost(t *testing.T) {
skip.If(t, os.Getuid() != 0, "skipping test that requires root")
c := &container.Container{
Config: &containertypes.Config{},
HostConfig: &containertypes.HostConfig{
NetworkMode: "host",
Sysctls: map[string]string{},
},
}
d := setupFakeDaemon(t, c)
defer cleanupFakeContainer(c)
// Ensure that the implicit sysctl is not set
s, err := d.createSpec(c)
assert.NilError(t, err)
assert.Equal(t, s.Linux.Sysctl["net.ipv4.ip_unprivileged_port_start"], "")
assert.Equal(t, s.Linux.Sysctl["net.ipv4.ping_group_range"], "")
// Set an explicit sysctl.
c.HostConfig.Sysctls["net.ipv4.ip_unprivileged_port_start"] = "1024"
s, err = d.createSpec(c)
assert.NilError(t, err)
assert.Equal(t, s.Linux.Sysctl["net.ipv4.ip_unprivileged_port_start"], c.HostConfig.Sysctls["net.ipv4.ip_unprivileged_port_start"])
}
func TestGetSourceMount(t *testing.T) {
skip.If(t, os.Getenv("PBUILDER_OPERATION") != "", "DM - skip test for pbuilder: Can't find mount point of /")
// must be able to find source mount for /
mnt, _, err := getSourceMount("/")
assert.NilError(t, err)
assert.Equal(t, mnt, "/")
// must be able to find source mount for current directory
cwd, err := os.Getwd()
assert.NilError(t, err)
_, _, err = getSourceMount(cwd)
assert.NilError(t, err)
}
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