added support for tmpfs-mode in compose file

Signed-off-by: Ethan Haynes <ethanhaynes@alumni.harvard.edu>

cli/compose/convert/volume.go

@@ -22,43 +22,37 @@ func Volumes(serviceVolumes []composetypes.ServiceVolumeConfig, stackVolumes vol
 	return mounts, nil
 }
 
-func convertVolumeToMount(
+func createMountFromVolume(volume composetypes.ServiceVolumeConfig) mount.Mount {
+	return mount.Mount{
+		Type:        mount.Type(volume.Type),
+		Target:      volume.Target,
+		ReadOnly:    volume.ReadOnly,
+		Source:      volume.Source,
+		Consistency: mount.Consistency(volume.Consistency),
+	}
+}
+
+func handleVolumeToMount(
 	volume composetypes.ServiceVolumeConfig,
 	stackVolumes volumes,
 	namespace Namespace,
 ) (mount.Mount, error) {
-	result := mount.Mount{
+	result := createMountFromVolume(volume)
-		Type:        mount.Type(volume.Type),
-		Source:      volume.Source,
-		Target:      volume.Target,
-		ReadOnly:    volume.ReadOnly,
-		Consistency: mount.Consistency(volume.Consistency),
-	}
 
+	if volume.Tmpfs != nil {
+		return mount.Mount{}, errors.New("tmpfs options are incompatible with type volume")
+	}
+	if volume.Bind != nil {
+		return mount.Mount{}, errors.New("bind options are incompatible with type volume")
+	}
 	// Anonymous volumes
 	if volume.Source == "" {
 		return result, nil
 	}
-	if volume.Type == "volume" && volume.Bind != nil {
-		return result, errors.New("bind options are incompatible with type volume")
-	}
-	if volume.Type == "bind" && volume.Volume != nil {
-		return result, errors.New("volume options are incompatible with type bind")
-	}
-
-	if volume.Bind != nil {
-		result.BindOptions = &mount.BindOptions{
-			Propagation: mount.Propagation(volume.Bind.Propagation),
-		}
-	}
-	// Binds volumes
-	if volume.Type == "bind" {
-		return result, nil
-	}
 
 	stackVolume, exists := stackVolumes[volume.Source]
 	if !exists {
-		return result, errors.Errorf("undefined volume %q", volume.Source)
+		return mount.Mount{}, errors.Errorf("undefined volume %q", volume.Source)
 	}
 
 	result.Source = namespace.Scope(volume.Source)
@@ -85,6 +79,62 @@ func convertVolumeToMount(
 		}
 	}
 
-	// Named volumes
 	return result, nil
 }
+
+func handleBindToMount(volume composetypes.ServiceVolumeConfig) (mount.Mount, error) {
+	result := createMountFromVolume(volume)
+
+	if volume.Source == "" {
+		return mount.Mount{}, errors.New("invalid bind source, source cannot be empty")
+	}
+	if volume.Volume != nil {
+		return mount.Mount{}, errors.New("volume options are incompatible with type bind")
+	}
+	if volume.Tmpfs != nil {
+		return mount.Mount{}, errors.New("tmpfs options are incompatible with type bind")
+	}
+	if volume.Bind != nil {
+		result.BindOptions = &mount.BindOptions{
+			Propagation: mount.Propagation(volume.Bind.Propagation),
+		}
+	}
+	return result, nil
+}
+
+func handleTmpfsToMount(volume composetypes.ServiceVolumeConfig) (mount.Mount, error) {
+	result := createMountFromVolume(volume)
+
+	if volume.Source != "" {
+		return mount.Mount{}, errors.New("invalid tmpfs source, source must be empty")
+	}
+	if volume.Bind != nil {
+		return mount.Mount{}, errors.New("bind options are incompatible with type tmpfs")
+	}
+	if volume.Volume != nil {
+		return mount.Mount{}, errors.New("volume options are incompatible with type tmpfs")
+	}
+	if volume.Tmpfs != nil {
+		result.TmpfsOptions = &mount.TmpfsOptions{
+			SizeBytes: volume.Tmpfs.Size,
+		}
+	}
+	return result, nil
+}
+
+func convertVolumeToMount(
+	volume composetypes.ServiceVolumeConfig,
+	stackVolumes volumes,
+	namespace Namespace,
+) (mount.Mount, error) {
+
+	switch volume.Type {
+	case "volume", "":
+		return handleVolumeToMount(volume, stackVolumes, namespace)
+	case "bind":
+		return handleBindToMount(volume)
+	case "tmpfs":
+		return handleTmpfsToMount(volume)
+	}
+	return mount.Mount{}, errors.New("volume type must be volume, bind, or tmpfs")
+}

cli/compose/convert/volume_test.go

@@ -22,7 +22,28 @@ func TestConvertVolumeToMountAnonymousVolume(t *testing.T) {
 	assert.Equal(t, expected, mount)
 }
 
-func TestConvertVolumeToMountConflictingOptionsBind(t *testing.T) {
+func TestConvertVolumeToMountAnonymousBind(t *testing.T) {
+	config := composetypes.ServiceVolumeConfig{
+		Type:   "bind",
+		Target: "/foo/bar",
+		Bind: &composetypes.ServiceVolumeBind{
+			Propagation: "slave",
+		},
+	}
+	_, err := convertVolumeToMount(config, volumes{}, NewNamespace("foo"))
+	assert.EqualError(t, err, "invalid bind source, source cannot be empty")
+}
+
+func TestConvertVolumeToMountUnapprovedType(t *testing.T) {
+	config := composetypes.ServiceVolumeConfig{
+		Type:   "foo",
+		Target: "/foo/bar",
+	}
+	_, err := convertVolumeToMount(config, volumes{}, NewNamespace("foo"))
+	assert.EqualError(t, err, "volume type must be volume, bind, or tmpfs")
+}
+
+func TestConvertVolumeToMountConflictingOptionsBindInVolume(t *testing.T) {
 	namespace := NewNamespace("foo")
 
 	config := composetypes.ServiceVolumeConfig{
@@ -37,7 +58,22 @@ func TestConvertVolumeToMountConflictingOptionsBind(t *testing.T) {
 	assert.EqualError(t, err, "bind options are incompatible with type volume")
 }
 
-func TestConvertVolumeToMountConflictingOptionsVolume(t *testing.T) {
+func TestConvertVolumeToMountConflictingOptionsTmpfsInVolume(t *testing.T) {
+	namespace := NewNamespace("foo")
+
+	config := composetypes.ServiceVolumeConfig{
+		Type:   "volume",
+		Source: "foo",
+		Target: "/target",
+		Tmpfs: &composetypes.ServiceVolumeTmpfs{
+			Size: 1000,
+		},
+	}
+	_, err := convertVolumeToMount(config, volumes{}, namespace)
+	assert.EqualError(t, err, "tmpfs options are incompatible with type volume")
+}
+
+func TestConvertVolumeToMountConflictingOptionsVolumeInBind(t *testing.T) {
 	namespace := NewNamespace("foo")
 
 	config := composetypes.ServiceVolumeConfig{
@@ -52,6 +88,49 @@ func TestConvertVolumeToMountConflictingOptionsVolume(t *testing.T) {
 	assert.EqualError(t, err, "volume options are incompatible with type bind")
 }
 
+func TestConvertVolumeToMountConflictingOptionsTmpfsInBind(t *testing.T) {
+	namespace := NewNamespace("foo")
+
+	config := composetypes.ServiceVolumeConfig{
+		Type:   "bind",
+		Source: "/foo",
+		Target: "/target",
+		Tmpfs: &composetypes.ServiceVolumeTmpfs{
+			Size: 1000,
+		},
+	}
+	_, err := convertVolumeToMount(config, volumes{}, namespace)
+	assert.EqualError(t, err, "tmpfs options are incompatible with type bind")
+}
+
+func TestConvertVolumeToMountConflictingOptionsBindInTmpfs(t *testing.T) {
+	namespace := NewNamespace("foo")
+
+	config := composetypes.ServiceVolumeConfig{
+		Type:   "tmpfs",
+		Target: "/target",
+		Bind: &composetypes.ServiceVolumeBind{
+			Propagation: "slave",
+		},
+	}
+	_, err := convertVolumeToMount(config, volumes{}, namespace)
+	assert.EqualError(t, err, "bind options are incompatible with type tmpfs")
+}
+
+func TestConvertVolumeToMountConflictingOptionsVolumeInTmpfs(t *testing.T) {
+	namespace := NewNamespace("foo")
+
+	config := composetypes.ServiceVolumeConfig{
+		Type:   "tmpfs",
+		Target: "/target",
+		Volume: &composetypes.ServiceVolumeVolume{
+			NoCopy: true,
+		},
+	}
+	_, err := convertVolumeToMount(config, volumes{}, namespace)
+	assert.EqualError(t, err, "volume options are incompatible with type tmpfs")
+}
+
 func TestConvertVolumeToMountNamedVolume(t *testing.T) {
 	stackVolumes := volumes{
 		"normal": composetypes.VolumeConfig{
@@ -231,3 +310,35 @@ func TestConvertVolumeToMountVolumeDoesNotExist(t *testing.T) {
 	_, err := convertVolumeToMount(config, volumes{}, namespace)
 	assert.EqualError(t, err, "undefined volume \"unknown\"")
 }
+
+func TestConvertTmpfsToMountVolume(t *testing.T) {
+	config := composetypes.ServiceVolumeConfig{
+		Type:   "tmpfs",
+		Target: "/foo/bar",
+		Tmpfs: &composetypes.ServiceVolumeTmpfs{
+			Size: 1000,
+		},
+	}
+	expected := mount.Mount{
+		Type:         mount.TypeTmpfs,
+		Target:       "/foo/bar",
+		TmpfsOptions: &mount.TmpfsOptions{SizeBytes: 1000},
+	}
+	mount, err := convertVolumeToMount(config, volumes{}, NewNamespace("foo"))
+	assert.NoError(t, err)
+	assert.Equal(t, expected, mount)
+}
+
+func TestConvertTmpfsToMountVolumeWithSource(t *testing.T) {
+	config := composetypes.ServiceVolumeConfig{
+		Type:   "tmpfs",
+		Source: "/bar",
+		Target: "/foo/bar",
+		Tmpfs: &composetypes.ServiceVolumeTmpfs{
+			Size: 1000,
+		},
+	}
+
+	_, err := convertVolumeToMount(config, volumes{}, NewNamespace("foo"))
+	assert.EqualError(t, err, "invalid tmpfs source, source must be empty")
+}

cli/compose/loader/full-example.yml

@@ -1,4 +1,4 @@
-version: "3.5"
+version: "3.6"
 
 services:
   foo:
@@ -10,7 +10,7 @@ services:
         foo: bar
       target: foo
       network: foo
-      cache_from: 
+      cache_from:
         - foo
         - bar
       labels: [FOO=BAR]
@@ -249,6 +249,10 @@ services:
         source: ./opt
         target: /opt
         consistency: cached
+      - type: tmpfs
+        target: /opt
+        tmpfs:
+          size: 10000
 
     working_dir: /code
 

cli/compose/loader/loader_test.go

@@ -1149,6 +1149,9 @@ func TestFullExample(t *testing.T) {
 			{Source: homeDir + "/configs", Target: "/etc/configs/", Type: "bind", ReadOnly: true},
 			{Source: "datavolume", Target: "/var/lib/mysql", Type: "volume"},
 			{Source: workingDir + "/opt", Target: "/opt", Consistency: "cached", Type: "bind"},
+			{Target: "/opt", Type: "tmpfs", Tmpfs: &types.ServiceVolumeTmpfs{
+				Size: int64(10000),
+			}},
 		},
 		WorkingDir: "/code",
 	}
@@ -1220,6 +1223,106 @@ func TestFullExample(t *testing.T) {
 	assert.Equal(t, expectedVolumeConfig, config.Volumes)
 }
 
+func TestLoadTmpfsVolume(t *testing.T) {
+	config, err := loadYAML(`
+version: "3.6"
+services:
+  tmpfs:
+    image: nginx:latest
+    volumes:
+      - type: tmpfs
+        target: /app
+        tmpfs:
+          size: 10000
+`)
+	require.NoError(t, err)
+
+	expected := types.ServiceVolumeConfig{
+		Target: "/app",
+		Type:   "tmpfs",
+		Tmpfs: &types.ServiceVolumeTmpfs{
+			Size: int64(10000),
+		},
+	}
+
+	require.Len(t, config.Services, 1)
+	assert.Len(t, config.Services[0].Volumes, 1)
+	assert.Equal(t, expected, config.Services[0].Volumes[0])
+}
+
+func TestLoadTmpfsVolumeAdditionalPropertyNotAllowed(t *testing.T) {
+	_, err := loadYAML(`
+version: "3.5"
+services:
+  tmpfs:
+    image: nginx:latest
+    volumes:
+      - type: tmpfs
+        target: /app
+        tmpfs:
+          size: 10000
+`)
+	require.Error(t, err)
+	assert.Contains(t, err.Error(), "services.tmpfs.volumes.0 Additional property tmpfs is not allowed")
+}
+
+func TestLoadTmpfsVolumeSizeCanBeZero(t *testing.T) {
+	config, err := loadYAML(`
+version: "3.6"
+services:
+  tmpfs:
+    image: nginx:latest
+    volumes:
+      - type: tmpfs
+        target: /app
+        tmpfs:
+          size: 0
+`)
+	require.NoError(t, err)
+
+	expected := types.ServiceVolumeConfig{
+		Target: "/app",
+		Type:   "tmpfs",
+		Tmpfs:  &types.ServiceVolumeTmpfs{},
+	}
+
+	require.Len(t, config.Services, 1)
+	assert.Len(t, config.Services[0].Volumes, 1)
+	assert.Equal(t, expected, config.Services[0].Volumes[0])
+}
+
+func TestLoadTmpfsVolumeSizeMustBeGTEQZero(t *testing.T) {
+	_, err := loadYAML(`
+version: "3.6"
+services:
+  tmpfs:
+    image: nginx:latest
+    volumes:
+      - type: tmpfs
+        target: /app
+        tmpfs:
+          size: -1
+`)
+	require.Error(t, err)
+	assert.Contains(t, err.Error(), "services.tmpfs.volumes.0.tmpfs.size Must be greater than or equal to 0")
+}
+
+func TestLoadTmpfsVolumeSizeMustBeInteger(t *testing.T) {
+	_, err := loadYAML(`
+version: "3.6"
+services:
+  tmpfs:
+    image: nginx:latest
+    volumes:
+      - type: tmpfs
+        target: /app
+        tmpfs:
+          size: 0.0001
+`)
+	require.Error(t, err)
+	assert.Contains(t, err.Error(), "services.tmpfs.volumes.0.tmpfs.size must be a integer")
+}
+
 func serviceSort(services []types.ServiceConfig) []types.ServiceConfig {
 	sort.Sort(servicesByName(services))
 	return services

cli/compose/types/types.go

@@ -23,7 +23,6 @@ var UnsupportedProperties = []string{
 	"security_opt",
 	"shm_size",
 	"sysctls",
-	"tmpfs",
 	"ulimits",
 	"userns_mode",
 }
@@ -284,6 +283,7 @@ type ServiceVolumeConfig struct {
 	Consistency string
 	Bind        *ServiceVolumeBind
 	Volume      *ServiceVolumeVolume
+	Tmpfs       *ServiceVolumeTmpfs
 }
 
 // ServiceVolumeBind are options for a service volume of type bind
@@ -296,6 +296,11 @@ type ServiceVolumeVolume struct {
 	NoCopy bool `mapstructure:"nocopy"`
 }
 
+// ServiceVolumeTmpfs are options for a service volume of type tmpfs
+type ServiceVolumeTmpfs struct {
+	Size int64
+}
+
 // FileReferenceConfig for a reference to a swarm file object
 type FileReferenceConfig struct {
 	Source string