Add upgrade command (#6)

* Add `upgrade` command to upgrade a release to a new version of the chart from GitHub

.gitignore

@@ -1 +1,4 @@
 repos
+.idea
+helm-github.iml
+

LICENSE

@@ -186,7 +186,7 @@
       same "printed page" as the copyright notice for easier
       identification within third-party archives.
 
-   Copyright [2017] [Gladly Software, Inc.]
+   Copyright 2017-2018 Gladly Software, Inc.
 
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
@@ -198,4 +198,4 @@
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
-   limitations under the License.
+   limitations under the License.

README.md

@@ -1,23 +1,38 @@
 # helm-github
 
-This is a helm plugin that installs raw helm charts from github.
+A Helm plugin that installs or upgrades raw Helm charts from GitHub
+
+* https://docs.helm.sh/helm/#helm-install
+* https://docs.helm.sh/helm/#helm-upgrade
+
 
 # Installation
   * `helm plugin install --version master https://github.com/sagansystems/helm-github.git`
   * `helm github --help`
 
 ![image](https://user-images.githubusercontent.com/52489/33590100-fa79e052-d931-11e7-9879-b0fd7db7d09a.png)
 
-# Updates
+
+# `helm-github` plugin updates
 
 ### Automatically
   * `helm github --update`
 
 ### Manually
   * `cd $HELM_HOME/plugins/`
   * `git pull`
-
+
+
 # Usage
-  * `helm github install --repo git@github.com:kubernetes/charts.git --path stable/external-dns/`
+
+### Install a chart from a GitHub repo
+
+  * `helm github install --repo git@github.com:kubernetes/charts.git --path stable/external-dns`
   * `helm github install --repo git@github.com:coreos/alb-ingress-controller.git --ref 6d64984 --path alb-ingress-controller-helm`
   * `helm github install --repo git@github.com:coreos/alb-ingress-controller.git --ref master --path alb-ingress-controller-helm --namespace kube-system --name alb-ingress-ctlr-1 -f alb-ingress-controller/values.yml --version 0.0.6`
+
+### Upgrade the `happy-panda` release to a new version of the chart from a GitHub repo
+
+  * `helm github upgrade happy-panda --repo git@github.com:kubernetes/charts.git --path stable/external-dns`
+  * `helm github upgrade happy-panda --repo git@github.com:coreos/alb-ingress-controller.git --ref 6d64984 --path alb-ingress-controller-helm`
+  * `helm github upgrade happy-panda --repo git@github.com:coreos/alb-ingress-controller.git --ref master --path alb-ingress-controller-helm -f alb-ingress-controller/values.yml --version 0.0.6`

github-install.sh → github.sh

@@ -3,32 +3,35 @@ set -e
 
 usage() {
 cat << EOF
-Install Helm charts from Github
-This is a helm plugin that installs raw helm charts from github.
-
-Example Usage:
-    helm github install --repo git@github.com:coreos/alb-ingress-controller.git --ref master --path alb-ingress-controller-helm
+Install or upgrade Helm charts from Github
+https://docs.helm.sh/helm/#helm-install
+https://docs.helm.sh/helm/#helm-upgrade
 
 Available Commands:
-    helm github install    Install a Helm chart from Github
+    helm github install             Install a Helm chart from Github
+    helm github upgrade <release>   Upgrades the release to a new version of the Helm chart from Github
 
 Available Flags:
     --repo, -r          (Required) Specify the repo to install
     --ref, -b           (Optional) Specify the branch, commit, or reference to checkout before installing
-    --path, -p          (Optional) Specify a path within repo where helm chart is stored. Must be relative to base of repo.
+    --path, -p          (Optional) Specify a path within repo where helm chart is stored. Must be relative to base of repo
     --debug             (Optional) Verbosity intensifies... ...
     --help              (Optional) This text.
-    --update, -u        (Optional) Update this plugin to latest master.
+    --update, -u        (Optional) Update this plugin to the latest version from the master branch
+
+Example Usage:
+    helm github install --repo git@github.com:coreos/alb-ingress-controller.git --ref master --path alb-ingress-controller-helm
+    helm github upgrade happy-panda --repo git@github.com:kubernetes/charts.git --path stable/external-dns
 EOF
 }
 
-# Lets create the passthru array
+# Create the passthru array
 PASSTHRU=()
 while [[ $# -gt 0 ]]
 do
 key="$1"
 
-# Arg Parse
+# Parse arguments
 case $key in
     -r|--repo)
     REPO="$2"
@@ -69,22 +72,22 @@ set -- "${PASSTHRU[@]}"
 
 # Show help if flagged
 if [ "$HELP" == "TRUE" ]; then
-  usage
-  exit 1
+    usage
+    exit 0
 fi
 
-#  Update plugin
+#  Update this Helm plugin
 if [ "$UPDATE" == "TRUE" ]; then  
-  cd "$HELM_HOME/plugins/helm-github"
-  git pull
-  PLUGIN_VERSION=$(git log --pretty=format:'%h' -n 1)
-  cd -
-  echo "Success! Updated this plugin to: $PLUGIN_VERSION"
-  exit 1
+    cd "$HELM_HOME/plugins/helm-github"
+    git pull
+    PLUGIN_VERSION=$(git log --pretty=format:'%h' -n 1)
+    cd -
+    echo "Success! Updated this plugin to: $PLUGIN_VERSION"
+    exit 0
 fi
 
 if [ -z "$REPO" ]; then
-    echo "Error: No Repo provided. Please provide --repo flag."
+    echo "Error: No Repo provided. Please provide --repo flag"
     usage
     exit 1
 fi 
@@ -118,7 +121,7 @@ fi
 if [ -d "${REPO_LOCATION}" ]; then
     cd $REPO_LOCATION
     git checkout master;
-    git pull; 
+    git pull;
 else
     git clone $REPO $REPO_LOCATION;
     cd $REPO_LOCATION;
@@ -130,6 +133,22 @@ git checkout $BRANCH
 # Exit the repo
 cd -
 
-# Install it!
-# Take out the first variable in passthru (install) so that helm install works
-helm install $REPO_LOCATION/$CHARTPATH "${PASSTHRU[@]:1}"
+# COMMAND must be either 'install' or 'upgrade'
+COMMAND=${PASSTHRU[0]}
+
+if [ "$COMMAND" == "install" ]; then
+    echo "Installing the Helm chart from the GitHub repo"
+    # Take out the first variable in passthru (install) so that helm install works
+    helm install "${PASSTHRU[@]:1}" $REPO_LOCATION/$CHARTPATH
+    exit 0
+elif [ "$COMMAND" == "upgrade" ]; then
+    RELEASE=${PASSTHRU[1]}
+    echo "Upgrading ${RELEASE} release to a new version of the chart from the GitHub repo"
+    # Take out the first two variables in passthru (install <release>) so that helm upgrade works
+    helm upgrade "${PASSTHRU[@]:2}" $RELEASE $REPO_LOCATION/$CHARTPATH
+    exit 0
+else
+    echo "Error: Invalid command, must be one of 'install' or 'upgrade'"
+    usage
+    exit 1
+fi

plugin.yaml

@@ -1,6 +1,6 @@
 name: "github"
-version: "0.1.0"
-usage: "Install helm charts from github repos"
+version: "0.2.0"
+usage: "Install or upgrade Helm charts from GitHub repos"
 description: |-
-  This plugin installs raw Helm charts from Github.
-command: "$HELM_PLUGIN_DIR/github-install.sh"
+  This plugin installs or upgrades raw Helm charts from Github
+command: "$HELM_PLUGIN_DIR/github.sh"