[ISSUE-64] Allow option to skip installing software (#65)

- Added install_software config parameter to prevent aladdin from doing infra/software installation and management

[64](#64)

README.md

@@ -53,6 +53,21 @@ You will now need to [create your aladdin configuration](./docs/create_aladdin_c
 
     $ aladdin config set config_dir /path/to/aladdin/configuration
 
+### Manage configuration
+#### Software dependencies
+aladdin installs software it needs like helm, jq, aws cli etc.
+
+But you may not need that if this applies to your situation:
+1. You already have a separate process for config management of your machine.
+1. You want to keep using your tools (scripts, ansible playbook etc).
+1. You don't want aladdin to install any software.
+
+Then run:
+
+```
+aladdin config set manage.software_dependencies false
+```
+
 ### VM Configuration
 Currently, the following parameters are configurable:
  * memory: By default, we create a minikube vm with 4096MB (4GB) of memory.  To change the size of the vm we create to e.g. 8GB, you may run:

aladdin.sh

@@ -15,6 +15,7 @@ NAMESPACE=default
 IS_TERMINAL=true
 SKIP_PROMPTS=false
 KUBERNETES_VERSION="1.15.6"
+MANAGE_SOFTWARE_DEPENDENCIES=true
 
 # Set key directory paths
 ALADDIN_DIR="$(cd "$(dirname "$0")" ; pwd)"
@@ -52,6 +53,14 @@ function get_plugin_dir() {
     fi
 }
 
+function get_manage_software_dependencies() {
+    if [[ -f "$HOME/.aladdin/config/config.json" ]]; then
+        MANAGE_SOFTWARE_DEPENDENCIES=$(jq -r .manage.software_dependencies $HOME/.aladdin/config/config.json)
+        if [[ "$MANAGE_SOFTWARE_DEPENDENCIES" == null ]]; then
+            MANAGE_SOFTWARE_DEPENDENCIES=true
+        fi
+    fi
+}
 # Check for cluster name aliases and alias them accordingly
 function check_cluster_alias() {
     cluster_alias=$(jq -r --arg key "$CLUSTER_CODE" '.cluster_aliases[$key]' "$ALADDIN_CONFIG_FILE")
@@ -74,7 +83,9 @@ function check_and_handle_init() {
     fi
     # Handle initialization logic
     if "$INIT"; then
-        "$SCRIPT_DIR"/infra_k8s_check.sh --force
+        if "$MANAGE_SOFTWARE_DEPENDENCIES"; then
+            "$SCRIPT_DIR"/infra_k8s_check.sh --force
+        fi
         enter_minikube_env
         copy_ssh_to_minikube
         minikube addons enable ingress > /dev/null
@@ -86,7 +97,9 @@ function check_and_handle_init() {
         docker pull "$aladdin_image"
         echo "$current_time" > "$last_launched_file"
     else
-        "$SCRIPT_DIR"/infra_k8s_check.sh
+        if "$MANAGE_SOFTWARE_DEPENDENCIES"; then
+            "$SCRIPT_DIR"/infra_k8s_check.sh
+        fi
         enter_minikube_env
     fi
 }
@@ -385,6 +398,7 @@ done
 exec_host_command "$@"
 get_config_path
 get_plugin_dir
+get_manage_software_dependencies
 exec_host_plugin "$@"
 check_cluster_alias
 check_and_handle_init