Add a guard to requirements installer for checking OS type

Author: mrdaliri

install-requirements.sh

@@ -1,28 +1,35 @@
 #!/bin/bash
 set -e
 
-# install requirements
-export DEBIAN_FRONTEND=noninteractive
-apt-get -y update
-apt-get -y install \
-  cmake \
-  g++-7 \
-  git \
-  python3-dev \
-  python3-numpy \
-  sudo \
-  wget
+if [[ "$OSTYPE" == "linux-gnu" ]]; then
+    # install requirements
+    export DEBIAN_FRONTEND=noninteractive
+    apt-get -y update
+    apt-get -y install \
+    cmake \
+    g++-7 \
+    git \
+    python3-dev \
+    python3-numpy \
+    sudo \
+    wget
 
-# install bazel
-export BAZEL_VERSION=${BAZEL_VERSION:-`cat ./Dockerfiles/BAZEL_VERSION`}
-apt-get -y install pkg-config zip g++ zlib1g-dev unzip python
-bazel_installer=bazel-${BAZEL_VERSION}-installer-linux-x86_64.sh
-wget -P /tmp https://github.com/bazelbuild/bazel/releases/download/${BAZEL_VERSION}/${bazel_installer}
-chmod +x /tmp/${bazel_installer}
-/tmp/${bazel_installer}
-rm /tmp/${bazel_installer}
+    # install bazel
+    export BAZEL_VERSION=${BAZEL_VERSION:-`cat ./Dockerfiles/BAZEL_VERSION`}
+    apt-get -y install pkg-config zip g++ zlib1g-dev unzip python
+    bazel_installer=bazel-${BAZEL_VERSION}-installer-linux-x86_64.sh
+    wget -P /tmp https://github.com/bazelbuild/bazel/releases/download/${BAZEL_VERSION}/${bazel_installer}
+    chmod +x /tmp/${bazel_installer}
+    /tmp/${bazel_installer}
+    rm /tmp/${bazel_installer}
 
-if [[ ${BUILD_WITH_CUDA:-"OFF"} == "ON" ]]; then
-    # install libcupti
-    apt-get -y install cuda-command-line-tools-10-1
+    if [[ ${BUILD_WITH_CUDA:-"OFF"} == "ON" ]]; then
+        # install libcupti
+        apt-get -y install cuda-command-line-tools-10-1
+    fi
+
+else
+    echo "This script supports only Debian-based operating systems (like Ubuntu)." \
+         "Please consult README file for manual installation on your '$OSTYPE' OS."
+    exit 1
 fi