feat(scripts): add script to sync repo

docs/chart_repository.md

@@ -78,7 +78,7 @@ Outside of your directory, run the `helm repo index [DIR] [URL]` command. This c
 $ helm repo index fantastic-charts http://storage.googleapis.com/fantastic-charts
 ```
 
-Now, you can upload the chart and the index file to your chart repository.
+Now, you can upload the chart and the index file to your chart repository using a sync tool or manually. If you're using Google Cloud Storage, check out this [example workflow](chart_respository_sync_example.md) using the gsutil client.
 
 ## Add a new chart to your chart repository
 

docs/chart_repository_sync_example.md

@@ -0,0 +1,74 @@
+# Syncing Your Chart Repository
+*Note: This example is specifically for a Google Cloud Storage (GCS) bucket which serves a chart repository.*
+
+## Prerequisites
+* Install the [gsutil](https://cloud.google.com/storage/docs/gsutil) tool. *We rely heavily on the gsutil rsync functionality*
+* Be sure to have access to the helm binary
+* _Optional: We recommend you set [object versioning](https://cloud.google.com/storage/docs/gsutil/addlhelp/ObjectVersioningandConcurrencyControl#top_of_page) on your GCS bucket in case you accidentally delete something._
+
+## Set up a local chart repository directory
+Create a local directory like we did in [the chart repository guide](chart_repository.md), and place your packaged charts in that directory.
+
+For example:
+```console
+$ mkdir fantastic-charts
+$ mv alpine-0.1.0.tgz fantastic-charts/
+```
+
+## Generate an updated index.yaml
+Use helm to generate an updated index.yaml file by passing in the directory path and the url of the remote repository to the `helm repo index` command like this:
+
+```console
+$ helm repo index fantastic-charts/ http://storage.googleapis.com/fantastic-charts
+```
+This will generate an updated index.yaml file and place in the `fantastic-charts/` directory.
+
+## Sync your local and remote chart repositories
+Upload the contents of the directory to your GCS bucket by running `scripts/sync-repo.sh` and pass in the local directory name and the GCS bucket name.
+
+For example:
+```console
+$ pwd
+/Users/funuser/go/src/github.com/kubernetes/helm
+$ scripts/sync-repo.sh fantastic-charts/ fantastic-charts
+Getting ready to sync your local directory (fantastic-charts/) to a remote repository at gs://fantastic-charts
+Verifying Prerequisites....
+Thumbs up! Looks like you have gsutil. Let's continue.
+Building synchronization state...
+Starting synchronization
+Would copy file://fantastic-charts/alpine-0.1.0.tgz to gs://fantastic-charts/alpine-0.1.0.tgz
+Would copy file://fantastic-charts/index.yaml to gs://fantastic-charts/index.yaml
+Are you sure you would like to continue with these changes?? [y/N]} y
+Building synchronization state...
+Starting synchronization
+Copying file://fantastic-charts/alpine-0.1.0.tgz [Content-Type=application/x-tar]...
+Uploading   gs://fantastic-charts/alpine-0.1.0.tgz:              740 B/740 B
+Copying file://fantastic-charts/index.yaml [Content-Type=application/octet-stream]...
+Uploading   gs://fantastic-charts/index.yaml:                    347 B/347 B
+Congratulations your remote chart repository now matches the contents of fantastic-charts/
+```
+## Updating your chart repository
+You'll want to keep a local copy of the contents of your chart repository or use `gsutil rsync` to copy the contents of your remote chart repository to a local directory.
+
+For example:
+```console
+$ gsutil rsync -d -n gs://bucket-name local-dir/    # the -n flag does a dry run
+Building synchronization state...
+Starting synchronization
+Would copy gs://bucket-name/alpine-0.1.0.tgz to file://local-dir/alpine-0.1.0.tgz
+Would copy gs://bucket-name/index.yaml to file://local-dir/index.yaml
+
+$ gsutil rsync -d gs://bucket-name local-dir/       # performs the copy actions
+Building synchronization state...
+Starting synchronization
+Copying gs://bucket-name/alpine-0.1.0.tgz...
+Downloading file://local-dir/alpine-0.1.0.tgz:                        740 B/740 B
+Copying gs://bucket-name/index.yaml...
+Downloading file://local-dir/index.yaml:                              346 B/346 B
+```
+
+
+Helpful Links:
+* Documentation on [gsutil rsync](https://cloud.google.com/storage/docs/gsutil/commands/rsync#description)
+* [The Chart Repository Guide](chart_repository.md)
+* Documentation on [object versioning and concurrency control](https://cloud.google.com/storage/docs/gsutil/addlhelp/ObjectVersioningandConcurrencyControl#overview) in Google Cloud Storage

scripts/sync-repo.sh

@@ -0,0 +1,68 @@
+#!/usr/bin/env bash
+
+# Bash 'Strict Mode'
+# http://redsymbol.net/articles/unofficial-bash-strict-mode
+set -euo pipefail
+IFS=$'\n\t'
+
+# Helper Functions -------------------------------------------------------------
+
+# Display error message and exit
+error_exit() {
+  echo "error: ${1:-"unknown error"}" 1>&2
+  exit 1
+}
+
+# Checks if a command exists.  Returns 1 or 0
+command_exists() {
+  hash "${1}" 2>/dev/null
+}
+
+# Program Functions ------------------------------------------------------------
+
+verify_prereqs() {
+  echo "Verifying Prerequisites...."
+  if command_exists gsutil; then
+    echo "Thumbs up! Looks like you have gsutil. Let's continue."
+  else
+    error_exit "Couldn't find gsutil. Bailing out."
+  fi
+}
+
+confirm() {
+  case $response in
+    [yY][eE][sS]|[yY])
+      true
+      ;;
+    *)
+      false
+      ;;
+  esac
+}
+
+# Main -------------------------------------------------------------------------
+
+main() {
+  if [ "$#" -ne 2 ]; then
+    error_exit "Illegal number of parameters. You must pass in local directory path and a GCS bucket name"
+  fi
+
+  echo "Getting ready to sync your local directory ($1) to a remote repository at gs://$2"
+
+  verify_prereqs
+
+  # dry run of the command
+  gsutil rsync -d -n $1 gs://$2
+
+  read -p "Are you sure you would like to continue with these changes? [y/N]} " confirm
+  if [[ $confirm =~ [yY](es)* ]]; then
+    gsutil rsync -d $1 gs://$2
+  else
+    error_exit "Discontinuing sync process."
+  fi
+
+  echo "Your remote chart repository now matches the contents of the $1 directory!"
+
+}
+
+main "${@:-}"