install: check for docker

scripts/installer/installer

@@ -12,6 +12,35 @@ for arg in "$@"; do
   fi
 done
 
+function check_docker {
+    dockerpath=$(which dockker)
+    if [ -z $dockerpath ]; then
+        echo "Docker was not found in your \$PATH. Attempt automatic installation? [y/N]"
+        read answer
+        if [[ $answer == "y" ]]; then
+            wget -O- https://get.docker.com | bash 
+        else
+            echo "Please install docker manually or add it to your \$PATH and re-run the installation script"
+            exit 1
+        fi
+    fi
+    docker info > /dev/null
+    if [[ $? != 0 ]]; then
+        echo "docker info returned a non-zero value. This could be caused by your user not being in the docker group. Add user to docker group? [y/N]"
+        read answer
+        if [[ $answer == "y" ]]; then
+            sudo usermod -aG docker $USER
+            if [[ $? != 0 ]]; then
+                echo "Adding user failed. Add your user to docker group and re-run the installer"
+                exit 1
+            fi
+        else
+            echo "Add your user to docker group and re-run the installer"
+            exit 1
+        fi
+    fi  
+}
+
 function show_banner {
   echo ""
   echo "   ____                           ____ _                 _ "
@@ -101,6 +130,7 @@ function install_abra_release {
 
 
 function run_installation {
+  check_docker
   show_banner
   install_abra_release
 }