Make `version` optional for local chart dependencies

Fixes #10095
Signed-off-by: Felipe Santos <felipecassiors@gmail.com>

cmd/helm/dependency.go

@@ -70,7 +70,7 @@ the dependency charts stored locally. The path should start with a prefix of
 
 If the dependency chart is retrieved locally, it is not required to have the
 repository added to helm by "helm add repo". Version matching is also supported
-for this case.
+for this case, but optional.
 `
 
 const dependencyListDesc = `

internal/resolver/resolver.go

@@ -58,31 +58,36 @@ func (r *Resolver) Resolve(reqs []*chart.Dependency, repoNames map[string]string
 	locked := make([]*chart.Dependency, len(reqs))
 	missing := []string{}
 	for i, d := range reqs {
-		constraint, err := semver.NewConstraint(d.Version)
-		if err != nil {
-			return nil, errors.Wrapf(err, "dependency %q has an invalid version/constraint format", d.Name)
-		}
+		var constraint *semver.Constraints
+		var chartpath string
+		var err error
 
-		if d.Repository == "" {
-			// Local chart subfolder
-			if _, err := GetLocalPath(filepath.Join("charts", d.Name), r.chartpath); err != nil {
-				return nil, err
-			}
-
-			locked[i] = &chart.Dependency{
-				Name:       d.Name,
-				Repository: "",
-				Version:    d.Version,
+		// If version is defined
+		if d.Version != "" {
+			constraint, err = semver.NewConstraint(d.Version)
+			if err != nil {
+				return nil, errors.Wrapf(err, "dependency %q has an invalid version/constraint format", d.Name)
 			}
-			continue
 		}
-		if strings.HasPrefix(d.Repository, "file://") {
 
-			chartpath, err := GetLocalPath(d.Repository, r.chartpath)
-			if err != nil {
-				return nil, err
+		// Local chart
+		if d.Repository == "" || strings.HasPrefix(d.Repository, "file://") {
+
+			if d.Repository == "" {
+				// From charts subfolder
+				chartpath, err = GetLocalPath(filepath.Join("charts", d.Name), r.chartpath)
+				if err != nil {
+					return nil, err
+				}
+			} else {
+				// From file:// repository
+				chartpath, err = GetLocalPath(d.Repository, r.chartpath)
+				if err != nil {
+					return nil, err
+				}
 			}
 
+			// Load chart to validate the version
 			ch, err := loader.LoadDir(chartpath)
 			if err != nil {
 				return nil, err
@@ -90,11 +95,15 @@ func (r *Resolver) Resolve(reqs []*chart.Dependency, repoNames map[string]string
 
 			v, err := semver.NewVersion(ch.Metadata.Version)
 			if err != nil {
-				// Not a legit entry.
+				// If version is not set and the version from the local chart is invalid
+				if d.Version == "" {
+					missing = append(missing, d.Name)
+				}
 				continue
 			}
 
-			if !constraint.Check(v) {
+			// If version is set but does not match the local chart
+			if d.Version != "" && !constraint.Check(v) {
 				missing = append(missing, d.Name)
 				continue
 			}

internal/resolver/resolver_test.go

@@ -137,6 +137,28 @@ func TestResolve(t *testing.T) {
 			},
 			err: true,
 		},
+		{
+			name: "no version set for local chart under charts path",
+			req: []*chart.Dependency{
+				{Name: "localdependency", Repository: "", Version: ""},
+			},
+			expect: &chart.Lock{
+				Dependencies: []*chart.Dependency{
+					{Name: "localdependency", Repository: "", Version: "0.1.0"},
+				},
+			},
+		},
+		{
+			name: "no version set for local chart from file://",
+			req: []*chart.Dependency{
+				{Name: "localdependency", Repository: "file://base", Version: ""},
+			},
+			expect: &chart.Lock{
+				Dependencies: []*chart.Dependency{
+					{Name: "localdependency", Repository: "file://base", Version: "0.1.0"},
+				},
+			},
+		},
 	}
 
 	repoNames := map[string]string{"alpine": "kubernetes-charts", "redis": "kubernetes-charts"}