populate chart command long descriptions

Signed-off-by: Josh Dolitsky <jdolitsky@gmail.com>

cmd/helm/chart_list.go

@@ -25,7 +25,9 @@ import (
 )
 
 const chartListDesc = `
-TODO
+List all charts in the local registry cache.
+
+Charts are sorted by ref name, alphabetically.
 `
 
 func newChartListCmd(cfg *action.Configuration, out io.Writer) *cobra.Command {

cmd/helm/chart_pull.go

@@ -26,7 +26,9 @@ import (
 )
 
 const chartPullDesc = `
-TODO
+Download a chart from a remote registry.
+
+This will store the chart in the local registry cache to be used later.
 `
 
 func newChartPullCmd(cfg *action.Configuration, out io.Writer) *cobra.Command {

cmd/helm/chart_push.go

@@ -26,7 +26,11 @@ import (
 )
 
 const chartPushDesc = `
-TODO
+Upload a chart to a remote registry.
+
+Note: the ref must already exist in the local registry cache.
+
+Must first run "helm chart save" or "helm chart pull".
 `
 
 func newChartPushCmd(cfg *action.Configuration, out io.Writer) *cobra.Command {

cmd/helm/chart_remove.go

@@ -26,7 +26,12 @@ import (
 )
 
 const chartRemoveDesc = `
-TODO
+Remove a chart from the local registry cache.
+
+Note: the chart content will still exist in the cache,
+but it will no longer appear in "helm chart list".
+
+To remove all unlinked content, please run "helm chart prune". (TODO)
 `
 
 func newChartRemoveCmd(cfg *action.Configuration, out io.Writer) *cobra.Command {

cmd/helm/chart_save.go

@@ -26,7 +26,10 @@ import (
 )
 
 const chartSaveDesc = `
-TODO
+Store a copy of chart in local registry cache.
+
+Note: modifying the chart after this operation will
+not change the item as it exists in the cache.
 `
 
 func newChartSaveCmd(cfg *action.Configuration, out io.Writer) *cobra.Command {