Add upgrade command

.gitignore

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

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

@@ -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 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

@@ -1,5 +1,5 @@
 name: "github"
-version: "0.1.0"
+version: "0.1.1"
 usage: "Install helm charts from github repos"
 description: |-
   This plugin installs raw Helm charts from Github.