Add script flags for optionally installing acme.sh or downloading default conf

setup.sh

@@ -1,15 +1,60 @@
 #!/bin/bash
+
+INSTALL_ACMESH=0;
+DOWNLOAD_DEFAULT=0;
+
+GIST="https://gist.github.com/Decicus/2f09db5d30f4f24e39de3792bba75b72/raw"
+NGINX="/etc/nginx"
+SSL_BASE="/srv/ssl"
+DEFAULT_DIR="$NGINX/conf.d";
+DEFAULT_NAME="000-default.conf";
+
+help()
+{
+cat << EOF
+usage: $0
+Install the \`nginx\` package via apt and add extra configuration files.
+OPTIONS:
+    -h        Shows helptext
+    -a        Installs acme.sh and downloads "bootstrapping" files.
+    -d        Downloads the $DEFAULT_NAME file into $DEFAULT_DIR
+EOF
+}
+
+while getopts "had" opt; do
+    case $opt in
+        h)
+            help
+            exit 0
+            ;;
+        a)
+            INSTALL_ACMESH=1;
+            echo "Installing and bootstrapping \`acme.sh\`";
+            ;;
+        d)
+            DOWNLOAD_DEFAULT=1;
+            echo "Downloading 000-default.conf to /etc/nginx/conf.d";
+            ;;
+        \?)
+            echo "Invalid option: -$OPTARG" >&2
+            exit 1
+            ;;
+        :)
+            echo "Option -$OPTARG requires an argument." >&2
+            exit 1
+            ;;
+    esac
+done
+
 # Make sure the 'essentials' are installed
 # We use `nginx` as the script assumes the script for using nginx.org APT repos has been used (https://git.io/nginx-debian)
 # Using `nginx-full` would in this case use the Debian/Ubuntu repos, which are a few versions behind.
 sudo apt install -y nginx openssl curl
 
-# Get acme.sh for issuing certificates
-curl -L https://get.acme.sh/ | sudo bash
-
-GIST="https://gist.github.com/Decicus/2f09db5d30f4f24e39de3792bba75b72/raw"
-NGINX="/etc/nginx"
-SSL_BASE="/srv/ssl"
+if [[ $INSTALL_ACMESH ]]; then
+    # Get acme.sh for issuing certificates
+    curl -L https://get.acme.sh/ | sudo bash
+fi
 
 # Create preferred base directory for storing SSL certificates
 mkdir -p $SSL_BASE
@@ -22,7 +67,12 @@ chmod -R 600 $SSL_BASE
 # But I use zsh as the main shell
 # Therefore I need a shared "environment file" that loads acme.sh
 # And related environment variables
-curl -L "$GIST/.acmeenv" > "$HOME/.acmeenv"
+if [[ $INSTALL_ACMESH ]]; then
+    # Add to ZSH/Bash config files
+    curl -L "$GIST/.acmeenv" > "$HOME/.acmeenv"
+    echo '. "$HOME/.acmeenv"' >> "$HOME/.zshrc";
+    echo '. "$HOME/.acmeenv"' >> "$HOME/.bashrc";
+fi
 
 # Get the alias config for Let's Encrypt challenges:
 curl -L "$GIST/letsencrypt.conf" > "$NGINX/letsencrypt.conf"
@@ -40,8 +90,8 @@ curl -L "$GIST/phpfpm.conf" > "$NGINX/phpfpm.conf"
 # Get the dhparams file generation script, and execute.
 curl -L "$GIST/generate-dhparams.sh" | sudo bash
 
-# Add to ZSH/Bash config files
-echo '. "$HOME/.acmeenv"' >> "$HOME/.zshrc";
-echo '. "$HOME/.acmeenv"' >> "$HOME/.bashrc";
+if [[ $DOWNLOAD_DEFAULT ]]; then
+    curl -L "$GIST/$DEFAULT_NAME" > "$DEFAULT_DIR/$DEFAULT_NAME"
+fi
 
-echo "Base setup done. Open this link for a base nginx site configuration: $GIST/000-default.conf"
+echo "Base setup done. Open this link for a base nginx site configuration: $GIST/$DEFAULT_NAME"