// +build linux
package daemon // import "github.com/docker/docker/daemon"
import (
"io/ioutil"
"os"
"path/filepath"
"strings"
"testing"
containertypes "github.com/docker/docker/api/types/container"
"github.com/docker/docker/daemon/config"
"github.com/moby/sys/mount"
"github.com/moby/sys/mountinfo"
"gotest.tools/v3/assert"
is "gotest.tools/v3/assert/cmp"
)
const mountsFixture = `142 78 0:38 / / rw,relatime - aufs none rw,si=573b861da0b3a05b,dio
143 142 0:60 / /proc rw,nosuid,nodev,noexec,relatime - proc proc rw
144 142 0:67 / /dev rw,nosuid - tmpfs tmpfs rw,mode=755
145 144 0:78 / /dev/pts rw,nosuid,noexec,relatime - devpts devpts rw,gid=5,mode=620,ptmxmode=666
146 144 0:49 / /dev/mqueue rw,nosuid,nodev,noexec,relatime - mqueue mqueue rw
147 142 0:84 / /sys rw,nosuid,nodev,noexec,relatime - sysfs sysfs rw
148 147 0:86 / /sys/fs/cgroup rw,nosuid,nodev,noexec,relatime - tmpfs tmpfs rw,mode=755
149 148 0:22 /docker/5425782a95e643181d8a485a2bab3c0bb21f51d7dfc03511f0e6fbf3f3aa356a /sys/fs/cgroup/cpuset rw,nosuid,nodev,noexec,relatime - cgroup cgroup rw,cpuset
150 148 0:25 /docker/5425782a95e643181d8a485a2bab3c0bb21f51d7dfc03511f0e6fbf3f3aa356a /sys/fs/cgroup/cpu rw,nosuid,nodev,noexec,relatime - cgroup cgroup rw,cpu
151 148 0:27 /docker/5425782a95e643181d8a485a2bab3c0bb21f51d7dfc03511f0e6fbf3f3aa356a /sys/fs/cgroup/cpuacct rw,nosuid,nodev,noexec,relatime - cgroup cgroup rw,cpuacct
152 148 0:28 /docker/5425782a95e643181d8a485a2bab3c0bb21f51d7dfc03511f0e6fbf3f3aa356a /sys/fs/cgroup/memory rw,nosuid,nodev,noexec,relatime - cgroup cgroup rw,memory
153 148 0:29 /docker/5425782a95e643181d8a485a2bab3c0bb21f51d7dfc03511f0e6fbf3f3aa356a /sys/fs/cgroup/devices rw,nosuid,nodev,noexec,relatime - cgroup cgroup rw,devices
154 148 0:30 /docker/5425782a95e643181d8a485a2bab3c0bb21f51d7dfc03511f0e6fbf3f3aa356a /sys/fs/cgroup/freezer rw,nosuid,nodev,noexec,relatime - cgroup cgroup rw,freezer
155 148 0:31 /docker/5425782a95e643181d8a485a2bab3c0bb21f51d7dfc03511f0e6fbf3f3aa356a /sys/fs/cgroup/blkio rw,nosuid,nodev,noexec,relatime - cgroup cgroup rw,blkio
156 148 0:32 /docker/5425782a95e643181d8a485a2bab3c0bb21f51d7dfc03511f0e6fbf3f3aa356a /sys/fs/cgroup/perf_event rw,nosuid,nodev,noexec,relatime - cgroup cgroup rw,perf_event
157 148 0:33 /docker/5425782a95e643181d8a485a2bab3c0bb21f51d7dfc03511f0e6fbf3f3aa356a /sys/fs/cgroup/hugetlb rw,nosuid,nodev,noexec,relatime - cgroup cgroup rw,hugetlb
158 148 0:35 /docker/5425782a95e643181d8a485a2bab3c0bb21f51d7dfc03511f0e6fbf3f3aa356a /sys/fs/cgroup/systemd rw,nosuid,nodev,noexec,relatime - cgroup systemd rw,name=systemd
159 142 8:4 /home/mlaventure/gopath /home/mlaventure/gopath rw,relatime - ext4 /dev/disk/by-uuid/d99e196c-1fc4-4b4f-bab9-9962b2b34e99 rw,errors=remount-ro,data=ordered
160 142 8:4 /var/lib/docker/volumes/9a428b651ee4c538130143cad8d87f603a4bf31b928afe7ff3ecd65480692b35/_data /var/lib/docker rw,relatime - ext4 /dev/disk/by-uuid/d99e196c-1fc4-4b4f-bab9-9962b2b34e99 rw,errors=remount-ro,data=ordered
164 142 8:4 /home/mlaventure/gopath/src/github.com/docker/docker /go/src/github.com/docker/docker rw,relatime - ext4 /dev/disk/by-uuid/d99e196c-1fc4-4b4f-bab9-9962b2b34e99 rw,errors=remount-ro,data=ordered
165 142 8:4 /var/lib/docker/containers/5425782a95e643181d8a485a2bab3c0bb21f51d7dfc03511f0e6fbf3f3aa356a/resolv.conf /etc/resolv.conf rw,relatime - ext4 /dev/disk/by-uuid/d99e196c-1fc4-4b4f-bab9-9962b2b34e99 rw,errors=remount-ro,data=ordered
166 142 8:4 /var/lib/docker/containers/5425782a95e643181d8a485a2bab3c0bb21f51d7dfc03511f0e6fbf3f3aa356a/hostname /etc/hostname rw,relatime - ext4 /dev/disk/by-uuid/d99e196c-1fc4-4b4f-bab9-9962b2b34e99 rw,errors=remount-ro,data=ordered
167 142 8:4 /var/lib/docker/containers/5425782a95e643181d8a485a2bab3c0bb21f51d7dfc03511f0e6fbf3f3aa356a/hosts /etc/hosts rw,relatime - ext4 /dev/disk/by-uuid/d99e196c-1fc4-4b4f-bab9-9962b2b34e99 rw,errors=remount-ro,data=ordered
168 144 0:39 / /dev/shm rw,nosuid,nodev,noexec,relatime - tmpfs shm rw,size=65536k
169 144 0:12 /14 /dev/console rw,nosuid,noexec,relatime - devpts devpts rw,gid=5,mode=620,ptmxmode=000
83 147 0:10 / /sys/kernel/security rw,relatime - securityfs none rw
89 142 0:87 / /tmp rw,relatime - tmpfs none rw
97 142 0:60 / /run/docker/netns/default rw,nosuid,nodev,noexec,relatime - proc proc rw
100 160 8:4 /var/lib/docker/volumes/9a428b651ee4c538130143cad8d87f603a4bf31b928afe7ff3ecd65480692b35/_data/aufs /var/lib/docker/aufs rw,relatime - ext4 /dev/disk/by-uuid/d99e196c-1fc4-4b4f-bab9-9962b2b34e99 rw,errors=remount-ro,data=ordered
115 100 0:102 / /var/lib/docker/aufs/mnt/0ecda1c63e5b58b3d89ff380bf646c95cc980252cf0b52466d43619aec7c8432 rw,relatime - aufs none rw,si=573b861dbc01905b,dio
116 160 0:107 / /var/lib/docker/containers/d045dc441d2e2e1d5b3e328d47e5943811a40819fb47497c5f5a5df2d6d13c37/shm rw,nosuid,nodev,noexec,relatime - tmpfs shm rw,size=65536k
118 142 0:102 / /run/docker/libcontainerd/d045dc441d2e2e1d5b3e328d47e5943811a40819fb47497c5f5a5df2d6d13c37/rootfs rw,relatime - aufs none rw,si=573b861dbc01905b,dio
242 142 0:60 / /run/docker/netns/c3664df2a0f7 rw,nosuid,nodev,noexec,relatime - proc proc rw
120 100 0:122 / /var/lib/docker/aufs/mnt/03ca4b49e71f1e49a41108829f4d5c70ac95934526e2af8984a1f65f1de0715d rw,relatime - aufs none rw,si=573b861eb147805b,dio
171 142 0:122 / /run/docker/libcontainerd/e406ff6f3e18516d50e03dbca4de54767a69a403a6f7ec1edc2762812824521e/rootfs rw,relatime - aufs none rw,si=573b861eb147805b,dio
310 142 0:60 / /run/docker/netns/71a18572176b rw,nosuid,nodev,noexec,relatime - proc proc rw
`
func TestCleanupMounts(t *testing.T) {
d := &Daemon{
root: "/var/lib/docker/",
}
expected := "/var/lib/docker/containers/d045dc441d2e2e1d5b3e328d47e5943811a40819fb47497c5f5a5df2d6d13c37/shm"
var unmounted int
unmount := func(target string) error {
if target == expected {
unmounted++
}
return nil
}
d.cleanupMountsFromReaderByID(strings.NewReader(mountsFixture), "", unmount)
if unmounted != 1 {
t.Fatal("Expected to unmount the shm (and the shm only)")
}
}
func TestCleanupMountsByID(t *testing.T) {
d := &Daemon{
root: "/var/lib/docker/",
}
expected := "/var/lib/docker/aufs/mnt/03ca4b49e71f1e49a41108829f4d5c70ac95934526e2af8984a1f65f1de0715d"
var unmounted int
unmount := func(target string) error {
if target == expected {
unmounted++
}
return nil
}
d.cleanupMountsFromReaderByID(strings.NewReader(mountsFixture), "03ca4b49e71f1e49a41108829f4d5c70ac95934526e2af8984a1f65f1de0715d", unmount)
if unmounted != 1 {
t.Fatal("Expected to unmount the auf root (and that only)")
}
}
func TestNotCleanupMounts(t *testing.T) {
d := &Daemon{
repository: "",
}
var unmounted bool
unmount := func(target string) error {
unmounted = true
return nil
}
mountInfo := `234 232 0:59 / /dev/shm rw,nosuid,nodev,noexec,relatime - tmpfs shm rw,size=65536k`
d.cleanupMountsFromReaderByID(strings.NewReader(mountInfo), "", unmount)
if unmounted {
t.Fatal("Expected not to clean up /dev/shm")
}
}
func TestValidateContainerIsolationLinux(t *testing.T) {
d := Daemon{}
_, err := d.verifyContainerSettings("linux", &containertypes.HostConfig{Isolation: containertypes.IsolationHyperV}, nil, false)
assert.Check(t, is.Error(err, "invalid isolation 'hyperv' on linux"))
}
func TestShouldUnmountRoot(t *testing.T) {
for _, test := range []struct {
desc string
root string
info *mountinfo.Info
expect bool
}{
{
desc: "root is at /",
root: "/docker",
info: &mountinfo.Info{Root: "/docker", Mountpoint: "/docker"},
expect: true,
},
{
desc: "root is at in a submount from `/`",
root: "/foo/docker",
info: &mountinfo.Info{Root: "/docker", Mountpoint: "/foo/docker"},
expect: true,
},
{
desc: "root is mounted in from a parent mount namespace same root dir", // dind is an example of this
root: "/docker",
info: &mountinfo.Info{Root: "/docker/volumes/1234657/_data", Mountpoint: "/docker"},
expect: false,
},
} {
t.Run(test.desc, func(t *testing.T) {
for _, options := range []struct {
desc string
Optional string
expect bool
}{
{desc: "shared", Optional: "shared:", expect: true},
{desc: "slave", Optional: "slave:", expect: false},
{desc: "private", Optional: "private:", expect: false},
} {
t.Run(options.desc, func(t *testing.T) {
expect := options.expect
if expect {
expect = test.expect
}
if test.info != nil {
test.info.Optional = options.Optional
}
assert.Check(t, is.Equal(expect, shouldUnmountRoot(test.root, test.info)))
})
}
})
}
}
func checkMounted(t *testing.T, p string, expect bool) {
t.Helper()
mounted, err := mountinfo.Mounted(p)
assert.Check(t, err)
assert.Check(t, mounted == expect, "expected %v, actual %v", expect, mounted)
}
func TestRootMountCleanup(t *testing.T) {
if os.Getuid() != 0 {
t.Skip("root required")
}
t.Parallel()
testRoot, err := ioutil.TempDir("", t.Name())
assert.NilError(t, err)
defer os.RemoveAll(testRoot)
cfg := &config.Config{}
err = mount.MakePrivate(testRoot)
assert.NilError(t, err)
defer mount.Unmount(testRoot)
cfg.ExecRoot = filepath.Join(testRoot, "exec")
cfg.Root = filepath.Join(testRoot, "daemon")
err = os.Mkdir(cfg.ExecRoot, 0755)
assert.NilError(t, err)
err = os.Mkdir(cfg.Root, 0755)
assert.NilError(t, err)
d := &Daemon{configStore: cfg, root: cfg.Root}
unmountFile := getUnmountOnShutdownPath(cfg)
t.Run("regular dir no mountpoint", func(t *testing.T) {
err = setupDaemonRootPropagation(cfg)
assert.NilError(t, err)
_, err = os.Stat(unmountFile)
assert.NilError(t, err)
checkMounted(t, cfg.Root, true)
assert.Assert(t, d.cleanupMounts())
checkMounted(t, cfg.Root, false)
_, err = os.Stat(unmountFile)
assert.Assert(t, os.IsNotExist(err))
})
t.Run("root is a private mountpoint", func(t *testing.T) {
err = mount.MakePrivate(cfg.Root)
assert.NilError(t, err)
defer mount.Unmount(cfg.Root)
err = setupDaemonRootPropagation(cfg)
assert.NilError(t, err)
assert.Check(t, ensureShared(cfg.Root))
_, err = os.Stat(unmountFile)
assert.Assert(t, os.IsNotExist(err))
assert.Assert(t, d.cleanupMounts())
checkMounted(t, cfg.Root, true)
})
// mount is pre-configured with a shared mount
t.Run("root is a shared mountpoint", func(t *testing.T) {
err = mount.MakeShared(cfg.Root)
assert.NilError(t, err)
defer mount.Unmount(cfg.Root)
err = setupDaemonRootPropagation(cfg)
assert.NilError(t, err)
if _, err := os.Stat(unmountFile); err == nil {
t.Fatal("unmount file should not exist")
}
assert.Assert(t, d.cleanupMounts())
checkMounted(t, cfg.Root, true)
assert.Assert(t, mount.Unmount(cfg.Root))
})
// does not need mount but unmount file exists from previous run
t.Run("old mount file is cleaned up on setup if not needed", func(t *testing.T) {
err = mount.MakeShared(testRoot)
assert.NilError(t, err)
defer mount.MakePrivate(testRoot)
err = ioutil.WriteFile(unmountFile, nil, 0644)
assert.NilError(t, err)
err = setupDaemonRootPropagation(cfg)
assert.NilError(t, err)
_, err = os.Stat(unmountFile)
assert.Check(t, os.IsNotExist(err), err)
checkMounted(t, cfg.Root, false)
assert.Assert(t, d.cleanupMounts())
})
}