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moby--moby/daemon/oci_linux_test.go

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package daemon // import "github.com/docker/docker/daemon"
import (
"testing"
containertypes "github.com/docker/docker/api/types/container"
"github.com/docker/docker/container"
"github.com/docker/docker/daemon/config"
"github.com/docker/docker/oci"
"github.com/docker/docker/pkg/idtools"
"github.com/stretchr/testify/assert"
)
// 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) {
d := Daemon{
// some empty structs to avoid getting a panic
// caused by a null pointer dereference
idMappings: &idtools.IDMappings{},
configStore: &config.Config{},
}
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",
},
},
}
// Mimick the code flow of daemon.createSpec(), enough to reproduce the issue
ms, err := d.setupMounts(c)
assert.NoError(t, err)
ms = append(ms, c.IpcMounts()...)
tmpfsMounts, err := c.TmpfsMounts()
assert.NoError(t, err)
ms = append(ms, tmpfsMounts...)
s := oci.DefaultSpec()
err = setMounts(&d, &s, c, ms)
assert.NoError(t, err)
}