feat: All the paths are relative to helmfile.yaml (roboll#261)

`helmfile lint` works with relative chart reference (roboll#252)
The tempalte function `readFile` accepts the path relative to helmfile.yaml

Resolves roboll#246
Fixes roboll#252

helmexec/exec.go

@@ -119,7 +119,7 @@ func (helm *execer) DecryptSecret(name string) (string, error) {
 
 	// os.Rename seems to results in "cross-device link` errors in some cases
 	// Instead of moving, copy it to the destination temp file as a work-around
-	// See https://github.com/roboll/helmfile/issues/251#issuecomment-417166296
+	// See https://github.com/roboll/helmfile/issues/251#issuecomment-417166296f
 	decFile, err := os.Open(name + ".dec")
 	if err != nil {
 		return "", err

main.go

@@ -18,6 +18,7 @@ import (
 	"github.com/urfave/cli"
 	"go.uber.org/zap"
 	"go.uber.org/zap/zapcore"
+	"io/ioutil"
 )
 
 const (
@@ -400,7 +401,7 @@ func eachDesiredStateDo(c *cli.Context, converge func(*state.HelmState, helmexec
 	}
 	allSelectorNotMatched := true
 	for _, f := range desiredStateFiles {
-		yamlBuf, err := tmpl.RenderTemplateFileToBuffer(f)
+		yamlBuf, err := tmpl.NewFileRenderer(ioutil.ReadFile, "").RenderTemplateFileToBuffer(f)
 		if err != nil {
 			return err
 		}

state/state.go

@@ -349,7 +349,7 @@ func (state *HelmState) LintReleases(helm helmexec.Interface, additionalValues [
 				}
 
 				chartPath := ""
-				if isLocalChart(release.Chart) {
+				if pathExists(normalizeChart(state.BaseChartPath, release.Chart)) {
 					chartPath = normalizeChart(state.BaseChartPath, release.Chart)
 				} else {
 					fetchFlags := []string{}
@@ -586,14 +586,18 @@ func (state *HelmState) UpdateDeps(helm helmexec.Interface) []error {
 // 	 be constructed relative to the `base path`.
 // - Everything else is assumed to be an absolute path or an actual <repository>/<chart> reference.
 func normalizeChart(basePath, chart string) string {
-	regex, _ := regexp.Compile("^[.]?./")
-	if !regex.MatchString(chart) {
+	if !isLocalChart(chart) {
 		return chart
 	}
 	return filepath.Join(basePath, chart)
 }
 
 func isLocalChart(chart string) bool {
+	regex, _ := regexp.Compile("^[.]?./")
+	return regex.MatchString(chart)
+}
+
+func pathExists(chart string) bool {
 	_, err := os.Stat(chart)
 	return err == nil
 }
@@ -680,7 +684,7 @@ func (state *HelmState) namespaceAndValuesFlags(helm helmexec.Interface, basePat
 			}
 			defer valfile.Close()
 
-			r := valuesfile.NewRenderer(ioutil.ReadFile)
+			r := valuesfile.NewRenderer(ioutil.ReadFile, state.BaseChartPath)
 			yamlBytes, err := r.RenderToBytes(path)
 			if err != nil {
 				return nil, err

state/state_test.go

@@ -560,7 +560,7 @@ func Test_isLocalChart(t *testing.T) {
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
 			if got := isLocalChart(tt.args.chart); got != tt.want {
-				t.Errorf("isLocalChart() = %v, want %v", got, tt.want)
+				t.Errorf("pathExists() = %v, want %v", got, tt.want)
 			}
 		})
 	}
@@ -879,7 +879,7 @@ func TestHelmState_UpdateDeps(t *testing.T) {
 				Chart: "published/deeper",
 			},
 			{
-				Chart: "./error",
+				Chart: ".error",
 			},
 		},
 	}

tmpl/file.go

@@ -2,16 +2,11 @@ package tmpl
 
 import (
 	"bytes"
-	"io/ioutil"
+	"path/filepath"
 )
 
-var DefaultFileRenderer *templateFileRenderer
-
-func init() {
-	DefaultFileRenderer = NewFileRenderer(ioutil.ReadFile)
-}
-
 type templateFileRenderer struct {
+	basePath string
 	ReadFile func(string) ([]byte, error)
 	Context  *Context
 }
@@ -20,8 +15,9 @@ type FileRenderer interface {
 	RenderTemplateFileToBuffer(file string) (*bytes.Buffer, error)
 }
 
-func NewFileRenderer(readFile func(filename string) ([]byte, error)) *templateFileRenderer {
+func NewFileRenderer(readFile func(filename string) ([]byte, error), basePath string) *templateFileRenderer {
 	return &templateFileRenderer{
+		basePath: basePath,
 		ReadFile: readFile,
 		Context: &Context{
 			readFile: readFile,
@@ -30,14 +26,13 @@ func NewFileRenderer(readFile func(filename string) ([]byte, error)) *templateFi
 }
 
 func (r *templateFileRenderer) RenderTemplateFileToBuffer(file string) (*bytes.Buffer, error) {
-	content, err := r.ReadFile(file)
+	// path to the file relative to the helmfile.yaml
+	path := filepath.Join(r.basePath, file)
+
+	content, err := r.ReadFile(path)
 	if err != nil {
 		return nil, err
 	}
 
 	return r.Context.RenderTemplateToBuffer(string(content))
 }
-
-func RenderTemplateFileToBuffer(file string) (*bytes.Buffer, error) {
-	return DefaultFileRenderer.RenderTemplateFileToBuffer(file)
-}

valuesfile/valuesfile.go

@@ -11,10 +11,10 @@ type renderer struct {
 	tmplFileRenderer tmpl.FileRenderer
 }
 
-func NewRenderer(readFile func(filename string) ([]byte, error)) *renderer {
+func NewRenderer(readFile func(filename string) ([]byte, error), basePath string) *renderer {
 	return &renderer{
 		readFile:         readFile,
-		tmplFileRenderer: tmpl.NewFileRenderer(readFile),
+		tmplFileRenderer: tmpl.NewFileRenderer(readFile, basePath),
 	}
 }
 

valuesfile/valuesfile_test.go

@@ -24,7 +24,7 @@ func TestRenderToBytes_Gotmpl(t *testing.T) {
 			return []byte(dataFileContent), nil
 		}
 		return nil, fmt.Errorf("unexpected filename: expected=%v or %v, actual=%s", dataFile, valuesTmplFile, filename)
-	})
+	}, "")
 	buf, err := r.RenderToBytes(valuesTmplFile)
 	if err != nil {
 		t.Errorf("unexpected error: %v", err)
@@ -49,7 +49,7 @@ func TestRenderToBytes_Yaml(t *testing.T) {
 			return []byte(valuesYamlContent), nil
 		}
 		return nil, fmt.Errorf("unexpected filename: expected=%v, actual=%s", valuesFile, filename)
-	})
+	}, "")
 	buf, err := r.RenderToBytes(valuesFile)
 	if err != nil {
 		t.Errorf("unexpected error: %v", err)