minio: Adds additional minio tenant user (canonical#299)

Previously, when the minio krew plugin was used to deploy the minio tenant,
the krew plugin created an additional user, with the credentials set in the
$TENANT_NAME-user-1 Kubernetes secret.

The Helm chart we're using does not do that by default, but it does accept
a list of Kubernetes secrets with CONSOLE_ACCESS_KEY (user) and
CONSOLE_SECRET_KEY (password) fields set in them.

With this change, we're now creating the secret ourselves, and passing it
onto the Helm chart. The minio tenant will have this new user, in addition
to the regular root user. With this, the behaviour that the krew plugin had
is preserved.

Additionally, remvoes reference to the kubectl-minio plugin since it doesn't
exist anymore.

(cherry picked from commit 8340271)

addons/minio/disable

@@ -3,7 +3,13 @@
 echo "Cleaning up MinIO tenants and operator"
 
 HELM="$SNAP/microk8s-helm3.wrapper"
+KUBECTL="$SNAP/microk8s-kubectl.wrapper"
 NAMESPACE="minio-operator"
+
+# Delete the secret we created for the tenant.
+tenant_name="$($HELM list -n $NAMESPACE --short | grep -v 'minio-operator')"
+$KUBECTL delete -n $NAMESPACE secret "${tenant_name}-user-1"
+
 $HELM list -n $NAMESPACE --short | xargs $HELM uninstall -n $NAMESPACE
 
 echo "Disabled minio addon."

addons/minio/enable

@@ -88,6 +88,15 @@ if [ "x${CREATE_TENANT}" = "xyes" ]; then
   echo "  Prometheus: ${PROMETHEUS}"
   echo ""
 
+  # Previously, kubectl-minio created an additional user. We will create here as well.
+  # This is done by creating a secret containing CONSOLE_ACCESS_KEY and CONSOLE_SECRET_KEY
+  # and referencing it in the helm chart below.
+  KUBECTL="$SNAP/microk8s-kubectl.wrapper"
+  SECRET_NAME="${TENANT}-user-1"
+  $KUBECTL create -n minio-operator secret generic "${SECRET_NAME}" \
+    --from-literal=CONSOLE_ACCESS_KEY="$(tr -dc A-Za-z0-9 </dev/urandom | head -c 20)" \
+    --from-literal=CONSOLE_SECRET_KEY="$(tr -dc A-Za-z0-9 </dev/urandom | head -c 40)"
+
   HELM_OPTS=
 
   if [ "x${TLS}" = "xno" ]; then
@@ -103,6 +112,7 @@ if [ "x${CREATE_TENANT}" = "xyes" ]; then
     --repo $REPO --version "${VERSION}" \
     --namespace "minio-operator" \
     --set "tenant.name=${TENANT}" \
+    --set "tenant.users[0].name=${SECRET_NAME}" \
     --set "tenant.pools[0].name=${TENANT}" \
     --set "tenant.pools[0].storageClassName=${STORAGE_CLASS}" \
     --set "tenant.pools[0].size=${CAPACITY}" \
@@ -116,9 +126,5 @@ fi
 echo "================================"
 echo "Enabled minio addon."
 echo ""
-echo "You can manage minio tenants using the kubectl-minio plugin."
-echo ""
-echo "For more details, use"
-echo ""
-echo "    microk8s kubectl-minio --help"
+echo "You can interact with minio through the minio client (https://min.io/docs/minio/linux/reference/minio-mc.html#minio-client)."
 echo ""