Support mounting volumes to containers

kyaml/runfn/runfn.go

@@ -51,6 +51,10 @@ type RunFns struct {
 	// NetworkName is the name of the docker network to use for the container
 	NetworkName string
 
+	// Volumes Volumes allows directories to be specified outside the configuration
+	// directory.
+	Volumes []string
+
 	// Output can be set to write the result to Output rather than back to the directory
 	Output io.Writer
 
@@ -133,6 +137,13 @@ func (r RunFns) getFilters(nodes []*yaml.RNode) ([]kio.Filter, error) {
 	}
 	fltrs = append(fltrs, f...)
 
+	// directories from volumes specified on the struct
+	f, err = r.getDirectoriesFromVolumes()
+	if err != nil {
+		return nil, err
+	}
+	fltrs = append(fltrs, f...)
+
 	// explicit fns specified on the struct
 	f, err = r.getFunctionsFromFunctions()
 	if err != nil {
@@ -196,6 +207,24 @@ func (r RunFns) getFunctionsFromFunctionPaths() ([]kio.Filter, error) {
 	return r.getFunctionFilters(true, buff.Nodes...)
 }
 
+// getDirectoriesFromVolumes returns the set of directories read from r.Volumes
+// as a slice of Filters
+func (r RunFns) getDirectoriesFromVolumes() ([]kio.Filter, error) {
+	buff := &kio.PackageBuffer{}
+	for i := range r.Volumes {
+		err := kio.Pipeline{
+			Inputs: []kio.Reader{
+				kio.LocalPackageReader{PackagePath: r.Volumes[i]},
+			},
+			Outputs: []kio.Writer{buff},
+		}.Execute()
+		if err != nil {
+			return nil, err
+		}
+	}
+	return r.getFunctionFilters(true, buff.Nodes...)
+}
+
 // getFunctionsFromFunctions returns the set of explicitly provided functions as
 // Filters
 func (r RunFns) getFunctionsFromFunctions() ([]kio.Filter, error) {

kyaml/runfn/runfn_test.go

@@ -140,6 +140,16 @@ func TestRunFns_Execute__initDefault(t *testing.T) {
 				FunctionPaths:        []string{"foo"},
 			},
 		},
+		{
+			name:     "explicit directories in volumes",
+			instance: RunFns{Volumes: []string{"vol"}},
+			expected: RunFns{
+				Output:               os.Stdout,
+				Input:                os.Stdin,
+				NoFunctionsFromInput: getFalse(),
+				Volumes:              []string{"vol"},
+			},
+		},
 	}
 	for i := range tests {
 		tt := tests[i]