fix(requirements): accept semver constraints for the versions in the requirements.yaml

cmd/helm/downloader/manager.go

@@ -116,8 +116,10 @@ func (m *Manager) Update() error {
 		return err
 	}
 
-	// Check that all of the repos we're dependent on actually exist.
-	if err := m.hasAllRepos(req.Dependencies); err != nil {
+	// Check that all of the repos we're dependent on actually exist and
+	// the repo index names.
+	repoNames, err := m.getRepoNames(req.Dependencies)
+	if err != nil {
 		return err
 	}
 
@@ -128,7 +130,7 @@ func (m *Manager) Update() error {
 
 	// Now we need to find out which version of a chart best satisfies the
 	// requirements the requirements.yaml
-	lock, err := m.resolve(req)
+	lock, err := m.resolve(req, repoNames)
 	if err != nil {
 		return err
 	}
@@ -160,9 +162,9 @@ func (m *Manager) loadChartDir() (*chart.Chart, error) {
 // resolve takes a list of requirements and translates them into an exact version to download.
 //
 // This returns a lock file, which has all of the requirements normalized to a specific version.
-func (m *Manager) resolve(req *chartutil.Requirements) (*chartutil.RequirementsLock, error) {
+func (m *Manager) resolve(req *chartutil.Requirements, repoNames map[string]string) (*chartutil.RequirementsLock, error) {
 	res := resolver.New(m.ChartPath, m.HelmHome)
-	return res.Resolve(req)
+	return res.Resolve(req, repoNames)
 }
 
 // downloadAll takes a list of dependencies and downloads them into charts/
@@ -239,6 +241,39 @@ func (m *Manager) hasAllRepos(deps []*chartutil.Dependency) error {
 	return nil
 }
 
+// getRepoNames returns the repo names of the referenced deps which can be used to fetch the cahced index file.
+func (m *Manager) getRepoNames(deps []*chartutil.Dependency) (map[string]string, error) {
+	rf, err := repo.LoadRepositoriesFile(m.HelmHome.RepositoryFile())
+	if err != nil {
+		return nil, err
+	}
+	repos := rf.Repositories
+
+	reposMap := make(map[string]string)
+
+	// Verify that all repositories referenced in the deps are actually known
+	// by Helm.
+	missing := []string{}
+	for _, dd := range deps {
+		found := false
+
+		for _, repo := range repos {
+			if urlsAreEqual(repo.URL, dd.Repository) {
+				found = true
+				reposMap[dd.Name] = repo.Name
+				break
+			}
+		}
+		if !found {
+			missing = append(missing, dd.Repository)
+		}
+	}
+	if len(missing) > 0 {
+		return nil, fmt.Errorf("no repository definition for %s. Try 'helm repo add'", strings.Join(missing, ", "))
+	}
+	return reposMap, nil
+}
+
 // UpdateRepositories updates all of the local repos to the latest.
 func (m *Manager) UpdateRepositories() error {
 	rf, err := repo.LoadRepositoriesFile(m.HelmHome.RepositoryFile())

cmd/helm/downloader/manager_test.go

@@ -17,9 +17,11 @@ package downloader
 
 import (
 	"bytes"
+	"reflect"
 	"testing"
 
 	"k8s.io/helm/cmd/helm/helmpath"
+	"k8s.io/helm/pkg/chartutil"
 )
 
 func TestVersionEquals(t *testing.T) {
@@ -84,3 +86,52 @@ func TestFindChartURL(t *testing.T) {
 	}
 
 }
+
+func TestGetRepoNames(t *testing.T) {
+	b := bytes.NewBuffer(nil)
+	m := &Manager{
+		Out:      b,
+		HelmHome: helmpath.Home("testdata/helmhome"),
+	}
+	tests := []struct {
+		name   string
+		req    []*chartutil.Dependency
+		expect map[string]string
+		err    bool
+	}{
+		{
+			name: "no repo definition failure",
+			req: []*chartutil.Dependency{
+				{Name: "oedipus-rex", Repository: "http://example.com/test"},
+			},
+			err: true,
+		},
+		{
+			name: "no repo definition failure",
+			req: []*chartutil.Dependency{
+				{Name: "oedipus-rex", Repository: "http://example.com"},
+			},
+			expect: map[string]string{"oedipus-rex": "testing"},
+		},
+	}
+
+	for _, tt := range tests {
+		l, err := m.getRepoNames(tt.req)
+		if err != nil {
+			if tt.err {
+				continue
+			}
+			t.Fatal(err)
+		}
+
+		if tt.err {
+			t.Fatalf("Expected error in test %q", tt.name)
+		}
+
+		// m1 and m2 are the maps we want to compare
+		eq := reflect.DeepEqual(l, tt.expect)
+		if !eq {
+			t.Errorf("%s: expected map %v, got %v", tt.name, l, tt.name)
+		}
+	}
+}

cmd/helm/resolver/resolver.go

@@ -19,6 +19,7 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
+	"strings"
 	"time"
 
 	"github.com/Masterminds/semver"
@@ -26,6 +27,7 @@ import (
 	"k8s.io/helm/cmd/helm/helmpath"
 	"k8s.io/helm/pkg/chartutil"
 	"k8s.io/helm/pkg/provenance"
+	"k8s.io/helm/pkg/repo"
 )
 
 // Resolver resolves dependencies from semantic version ranges to a particular version.
@@ -43,7 +45,7 @@ func New(chartpath string, helmhome helmpath.Home) *Resolver {
 }
 
 // Resolve resolves dependencies and returns a lock file with the resolution.
-func (r *Resolver) Resolve(reqs *chartutil.Requirements) (*chartutil.RequirementsLock, error) {
+func (r *Resolver) Resolve(reqs *chartutil.Requirements, repoNames map[string]string) (*chartutil.RequirementsLock, error) {
 	d, err := HashReq(reqs)
 	if err != nil {
 		return nil, err
@@ -51,22 +53,49 @@ func (r *Resolver) Resolve(reqs *chartutil.Requirements) (*chartutil.Requirement
 
 	// Now we clone the dependencies, locking as we go.
 	locked := make([]*chartutil.Dependency, len(reqs.Dependencies))
+	missing := []string{}
 	for i, d := range reqs.Dependencies {
-		// Right now, we're just copying one entry to another. What we need to
-		// do here is parse the requirement as a SemVer range, and then look up
-		// whether a version in index.yaml satisfies this constraint. If so,
-		// we need to clone the dep, setting Version appropriately.
-		// If not, we need to error out.
-		if _, err := semver.NewVersion(d.Version); err != nil {
-			return nil, fmt.Errorf("dependency %q has an invalid version: %s", d.Name, err)
+		constraint, err := semver.NewConstraint(d.Version)
+		if err != nil {
+			return nil, fmt.Errorf("dependency %q has an invalid version/constraint format: %s", d.Name, err)
 		}
+
+		repoIndex, err := repo.LoadIndexFile(r.helmhome.CacheIndex(repoNames[d.Name]))
+		if err != nil {
+			return nil, fmt.Errorf("no cached repo found. (try 'helm repo update'). %s", err)
+		}
+
+		vs, ok := repoIndex.Entries[d.Name]
+		if !ok {
+			return nil, fmt.Errorf("%s chart not found in repo %s", d.Name, d.Repository)
+		}
+
 		locked[i] = &chartutil.Dependency{
 			Name:       d.Name,
 			Repository: d.Repository,
-			Version:    d.Version,
 		}
-	}
+		found := false
+		// The version are already sorted and hence the first one to satisfy the constraint is used
+		for _, ver := range vs {
+			v, err := semver.NewVersion(ver.Version)
+			if err != nil || len(ver.URLs) == 0 {
+				// Not a legit entry.
+				continue
+			}
+			if constraint.Check(v) {
+				found = true
+				locked[i].Version = v.Original()
+				break
+			}
+		}
 
+		if !found {
+			missing = append(missing, d.Name)
+		}
+	}
+	if len(missing) > 0 {
+		return nil, fmt.Errorf("Can't get a valid version for repositories %s. Try changing the version constraint in requirements.yaml", strings.Join(missing, ", "))
+	}
 	return &chartutil.RequirementsLock{
 		Generated:    time.Now(),
 		Digest:       d,

cmd/helm/resolver/resolver_test.go

@@ -32,7 +32,34 @@ func TestResolve(t *testing.T) {
 			name: "version failure",
 			req: &chartutil.Requirements{
 				Dependencies: []*chartutil.Dependency{
-					{Name: "oedipus-rex", Repository: "http://example.com", Version: ">1"},
+					{Name: "oedipus-rex", Repository: "http://example.com", Version: ">a1"},
+				},
+			},
+			err: true,
+		},
+		{
+			name: "cache index failure",
+			req: &chartutil.Requirements{
+				Dependencies: []*chartutil.Dependency{
+					{Name: "oedipus-rex", Repository: "http://example.com", Version: "1.0.0"},
+				},
+			},
+			err: true,
+		},
+		{
+			name: "chart not found failure",
+			req: &chartutil.Requirements{
+				Dependencies: []*chartutil.Dependency{
+					{Name: "redis", Repository: "http://example.com", Version: "1.0.0"},
+				},
+			},
+			err: true,
+		},
+		{
+			name: "constraint not satisfied failure",
+			req: &chartutil.Requirements{
+				Dependencies: []*chartutil.Dependency{
+					{Name: "alpine", Repository: "http://example.com", Version: ">=1.0.0"},
 				},
 			},
 			err: true,
@@ -41,20 +68,21 @@ func TestResolve(t *testing.T) {
 			name: "valid lock",
 			req: &chartutil.Requirements{
 				Dependencies: []*chartutil.Dependency{
-					{Name: "antigone", Repository: "http://example.com", Version: "1.0.0"},
+					{Name: "alpine", Repository: "http://example.com", Version: ">=0.1.0"},
 				},
 			},
 			expect: &chartutil.RequirementsLock{
 				Dependencies: []*chartutil.Dependency{
-					{Name: "antigone", Repository: "http://example.com", Version: "1.0.0"},
+					{Name: "alpine", Repository: "http://example.com", Version: "0.2.0"},
 				},
 			},
 		},
 	}
 
+	repoNames := map[string]string{"alpine": "kubernetes-charts", "redis": "kubernetes-charts"}
 	r := New("testdata/chartpath", "testdata/helmhome")
 	for _, tt := range tests {
-		l, err := r.Resolve(tt.req)
+		l, err := r.Resolve(tt.req, repoNames)
 		if err != nil {
 			if tt.err {
 				continue

cmd/helm/resolver/testdata/helmhome/repository/cache/kubernetes-charts-index.yaml

+apiVersion: v1
+entries:
+  alpine:
+    - name: alpine
+      urls:
+        - https://kubernetes-charts.storage.googleapis.com/alpine-0.1.0.tgz
+      checksum: 0e6661f193211d7a5206918d42f5c2a9470b737d
+      home: https://k8s.io/helm
+      sources:
+      - https://github.com/kubernetes/helm
+      version: 0.2.0
+      description: Deploy a basic Alpine Linux pod
+      keywords: []
+      maintainers: []
+      engine: ""
+      icon: ""
+    - name: alpine
+      urls:
+        - https://kubernetes-charts.storage.googleapis.com/alpine-0.2.0.tgz
+      checksum: 0e6661f193211d7a5206918d42f5c2a9470b737d
+      home: https://k8s.io/helm
+      sources:
+      - https://github.com/kubernetes/helm
+      version: 0.1.0
+      description: Deploy a basic Alpine Linux pod
+      keywords: []
+      maintainers: []
+      engine: ""
+      icon: ""
+  mariadb:
+    - name: mariadb
+      urls:
+        - https://kubernetes-charts.storage.googleapis.com/mariadb-0.3.0.tgz
+      checksum: 65229f6de44a2be9f215d11dbff311673fc8ba56
+      home: https://mariadb.org
+      sources:
+      - https://github.com/bitnami/bitnami-docker-mariadb
+      version: 0.3.0
+      description: Chart for MariaDB
+      keywords:
+      - mariadb
+      - mysql
+      - database
+      - sql
+      maintainers:
+      - name: Bitnami
+        email: containers@bitnami.com
+      engine: gotpl
+      icon: ""