feat: Support for helm's --set-file

Resolves #207

state/state.go

@@ -81,6 +81,7 @@ type ReleaseSpec struct {
 type SetValue struct {
 	Name  string `yaml:"name"`
 	Value string `yaml:"value"`
+	File  string `yaml:"file"`
 }
 
 // CreateFromFile loads the helmfile from disk and processes the template
@@ -757,11 +758,13 @@ func (state *HelmState) namespaceAndValuesFlags(helm helmexec.Interface, basePat
 		flags = append(flags, "--values", valfile)
 	}
 	if len(release.SetValues) > 0 {
-		val := []string{}
 		for _, set := range release.SetValues {
-			val = append(val, fmt.Sprintf("%s=%s", escape(set.Name), escape(set.Value)))
+			if set.Value != "" {
+				flags = append(flags, "--set", fmt.Sprintf("%s=%s", escape(set.Name), escape(set.Value)))
+			} else if set.File != "" {
+				flags = append(flags, "--set-file", fmt.Sprintf("%s=%s", escape(set.Name), set.File))
+			}
 		}
-		flags = append(flags, "--set", strings.Join(val, ","))
 	}
 
 	/***********

state/state_test.go

@@ -704,7 +704,32 @@ func TestHelmState_SyncReleases(t *testing.T) {
 				},
 			},
 			helm:         &mockHelmExec{},
-			wantReleases: []mockRelease{{"releaseName", []string{"--set", "someList=a\\,b\\,c,json=\\{\"name\": \"john\"\\}"}}},
+			wantReleases: []mockRelease{{"releaseName", []string{"--set", "someList=a\\,b\\,c", "--set", "json=\\{\"name\": \"john\"\\}"}}},
+		},
+		{
+			name: "set single value from file",
+			releases: []ReleaseSpec{
+				{
+					Name:  "releaseName",
+					Chart: "foo",
+					SetValues: []SetValue{
+						{
+							Name:  "foo",
+							Value: "FOO",
+						},
+						{
+							Name: "bar",
+							File: "path/to/bar",
+						},
+						{
+							Name:  "baz",
+							Value: "BAZ",
+						},
+					},
+				},
+			},
+			helm:         &mockHelmExec{},
+			wantReleases: []mockRelease{{"releaseName", []string{"--set", "foo=FOO", "--set-file", "bar=path/to/bar", "--set", "baz=BAZ"}}},
 		},
 	}
 	for _, tt := range tests {