add InstallReleaseFromChart and UpdateReleaseFromChart

When using pkg/helm as a third party client, I am using chartutil.LoadArchive()
to load a chart from an io.Reader. After that is loaded I wish to install/update that
chart, however InstallRelease and UpdateRelease only accepts a path rather than
something of type *chart.Chart. This adds a new function called InstallReleaseFromChart
which allows one to load a chart separate from the path, then install said chart.

cmd/helm/helm_test.go

@@ -135,6 +135,12 @@ func (c *fakeReleaseClient) InstallRelease(chStr, ns string, opts ...helm.Instal
 	}, nil
 }
 
+func (c *fakeReleaseClient) InstallReleaseFromChart(chart *chart.Chart, ns string, opts ...helm.InstallOption) (*rls.InstallReleaseResponse, error) {
+	return &rls.InstallReleaseResponse{
+		Release: c.rels[0],
+	}, nil
+}
+
 func (c *fakeReleaseClient) DeleteRelease(rlsName string, opts ...helm.DeleteOption) (*rls.UninstallReleaseResponse, error) {
 	return nil, nil
 }
@@ -162,6 +168,10 @@ func (c *fakeReleaseClient) UpdateRelease(rlsName string, chStr string, opts ...
 	return nil, nil
 }
 
+func (c *fakeReleaseClient) UpdateReleaseFromChart(rlsName string, chart *chart.Chart, opts ...helm.UpdateOption) (*rls.UpdateReleaseResponse, error) {
+	return nil, nil
+}
+
 func (c *fakeReleaseClient) RollbackRelease(rlsName string, opts ...helm.RollbackOption) (*rls.RollbackReleaseResponse, error) {
 	return nil, nil
 }

pkg/helm/client.go

@@ -21,6 +21,7 @@ import (
 	"google.golang.org/grpc"
 
 	"k8s.io/helm/pkg/chartutil"
+	"k8s.io/helm/pkg/proto/hapi/chart"
 	rls "k8s.io/helm/pkg/proto/hapi/services"
 )
 
@@ -59,14 +60,19 @@ func (h *Client) ListReleases(opts ...ReleaseListOption) (*rls.ListReleasesRespo
 	return h.list(ctx, req)
 }
 
-// InstallRelease installs a new chart and returns the release response.
+// InstallRelease loads a chart from chstr, installs it and returns the release response.
 func (h *Client) InstallRelease(chstr, ns string, opts ...InstallOption) (*rls.InstallReleaseResponse, error) {
 	// load the chart to install
 	chart, err := chartutil.Load(chstr)
 	if err != nil {
 		return nil, err
 	}
 
+	return h.InstallReleaseFromChart(chart, ns, opts...)
+}
+
+// InstallReleaseFromChart installs a new chart and returns the release response.
+func (h *Client) InstallReleaseFromChart(chart *chart.Chart, ns string, opts ...InstallOption) (*rls.InstallReleaseResponse, error) {
 	// apply the install options
 	for _, opt := range opts {
 		opt(&h.opts)
@@ -116,14 +122,20 @@ func (h *Client) DeleteRelease(rlsName string, opts ...DeleteOption) (*rls.Unins
 	return h.delete(ctx, req)
 }
 
-// UpdateRelease updates a release to a new/different chart
+// UpdateRelease loads a chart from chstr and updates a release to a new/different chart
 func (h *Client) UpdateRelease(rlsName string, chstr string, opts ...UpdateOption) (*rls.UpdateReleaseResponse, error) {
 	// load the chart to update
 	chart, err := chartutil.Load(chstr)
 	if err != nil {
 		return nil, err
 	}
 
+	return h.UpdateReleaseFromChart(rlsName, chart, opts...)
+}
+
+// UpdateReleaseFromChart updates a release to a new/different chart
+func (h *Client) UpdateReleaseFromChart(rlsName string, chart *chart.Chart, opts ...UpdateOption) (*rls.UpdateReleaseResponse, error) {
+
 	// apply the update options
 	for _, opt := range opts {
 		opt(&h.opts)

pkg/helm/interface.go

@@ -17,16 +17,19 @@ limitations under the License.
 package helm
 
 import (
+	"k8s.io/helm/pkg/proto/hapi/chart"
 	rls "k8s.io/helm/pkg/proto/hapi/services"
 )
 
 // Interface for helm client for mocking in tests
 type Interface interface {
 	ListReleases(opts ...ReleaseListOption) (*rls.ListReleasesResponse, error)
 	InstallRelease(chStr, namespace string, opts ...InstallOption) (*rls.InstallReleaseResponse, error)
+	InstallReleaseFromChart(chart *chart.Chart, namespace string, opts ...InstallOption) (*rls.InstallReleaseResponse, error)
 	DeleteRelease(rlsName string, opts ...DeleteOption) (*rls.UninstallReleaseResponse, error)
 	ReleaseStatus(rlsName string, opts ...StatusOption) (*rls.GetReleaseStatusResponse, error)
 	UpdateRelease(rlsName, chStr string, opts ...UpdateOption) (*rls.UpdateReleaseResponse, error)
+	UpdateReleaseFromChart(rlsName string, chart *chart.Chart, opts ...UpdateOption) (*rls.UpdateReleaseResponse, error)
 	RollbackRelease(rlsName string, opts ...RollbackOption) (*rls.RollbackReleaseResponse, error)
 	ReleaseContent(rlsName string, opts ...ContentOption) (*rls.GetReleaseContentResponse, error)
 	ReleaseHistory(rlsName string, opts ...HistoryOption) (*rls.GetHistoryResponse, error)