Add Helm 3 wrapper (#882)

* Add Helm 3 wrapper

* Update wrappers

* Minor fixes after testing the PR

* Update snapcraft.yaml

* Wrappers should be executable. Or else the snap will not build.

Co-authored-by: Konstantinos Tsakalozos <kos.tsakalozos@canonical.com>

microk8s-resources/actions/disable.helm3.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+
+set -e
+
+source $SNAP/actions/common/utils.sh
+
+echo "Disabling Helm 3"
+
+if [ -f "${SNAP_DATA}/bin/helm3" ]
+then
+  sudo rm -f "$SNAP_DATA/bin/helm3"
+fi

microk8s-resources/actions/enable.helm3.sh

@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+
+set -e
+
+source $SNAP/actions/common/utils.sh
+CA_CERT=/snap/core/current/etc/ssl/certs/ca-certificates.crt
+
+echo "Enabling Helm 3"
+
+if [ ! -f "${SNAP_DATA}/bin/helm3" ]
+then
+  SOURCE_URI="https://get.helm.sh"
+  HELM_VERSION="v3.0.2"
+
+  echo "Fetching helm version $HELM_VERSION."
+  run_with_sudo mkdir -p "${SNAP_DATA}/tmp/helm"
+  (cd "${SNAP_DATA}/tmp/helm"
+  run_with_sudo "${SNAP}/usr/bin/curl" --cacert $CA_CERT -L $SOURCE_URI/helm-$HELM_VERSION-linux-$(arch).tar.gz -o "$SNAP_DATA/tmp/helm/helm.tar.gz"
+  run_with_sudo gzip -f -d "$SNAP_DATA/tmp/helm/helm.tar.gz"
+  run_with_sudo tar -xf "$SNAP_DATA/tmp/helm/helm.tar")
+
+  run_with_sudo mkdir -p "$SNAP_DATA/bin/"
+  run_with_sudo mv "$SNAP_DATA/tmp/helm/linux-$(arch)/helm" "$SNAP_DATA/bin/helm3"
+  run_with_sudo chmod +x "$SNAP_DATA/bin/"
+  run_with_sudo chmod +x "$SNAP_DATA/bin/helm3"
+
+  run_with_sudo rm -rf "$SNAP_DATA/tmp/helm"
+fi
+
+echo "Helm 3 is enabled"

microk8s-resources/wrappers/microk8s-helm3.wrapper

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+set -eu
+
+export PATH="$SNAP/usr/sbin:$SNAP/usr/bin:$SNAP/sbin:$SNAP/bin:$PATH"
+ARCH="$($SNAP/bin/uname -m)"
+export LD_LIBRARY_PATH="$SNAP/lib:$SNAP/usr/lib:$SNAP/lib/$ARCH-linux-gnu:$SNAP/usr/lib/$ARCH-linux-gnu"
+
+if [ ! -f "${SNAP_DATA}/bin/helm3" ]; then
+  echo "Helm 3 not available, try enabling it with 'microk8s.enable helm3'" >&2
+  exit 0
+fi
+
+source $SNAP/actions/common/utils.sh
+"${SNAP_DATA}/bin/helm3" --kubeconfig="${SNAP_DATA}"/credentials/client.config "$@"

microk8s-resources/wrappers/microk8s-status.wrapper

@@ -34,6 +34,7 @@ addon[jaeger]="pod/jaeger-operator"
 addon[linkerd]="pod/linkerd-controller"
 addon[cilium]="pod/cilium"
 addon[helm]="${SNAP_DATA}/bin/helm"
+addon[helm3]="${SNAP_DATA}/bin/helm3"
 addon[juju]="${SNAP_DATA}/bin/juju"
 addon[kubeflow]="pod/ambassador-operator-0 "
 addon[metallb]="pod/speaker"

snapcraft.yaml

@@ -81,6 +81,8 @@ apps:
     command: microk8s-linkerd.wrapper
   helm:
     command: microk8s-helm.wrapper
+  helm3:
+    command: microk8s-helm3.wrapper
   cilium:
     command: microk8s-cilium.wrapper
   juju: