Detect and automatically install unzip package.

Detects whether the unzip package is installed, and automatically installs unzip if it is not installed.

env.sh

@@ -4,3 +4,28 @@ script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 
 export XMAKE_RCFILES=${script_dir}/tools/scripts/xmake.lua
 export RT_XMAKE_LINK_TYPE="static"
+
+
+# Check whether unzip is installed.
+if ! command -v unzip &> /dev/null; then
+    echo "Unzip is not installed. Installing unzip"
+
+    # Automatically install unzip according to package manager
+    if [[ -n $(command -v apt-get) ]]; then
+        sudo apt-get update
+        sudo apt-get install -y unzip
+    elif [[ -n $(command -v yum) ]]; then
+        sudo yum install -y unzip
+    elif [[ -n $(command -v dnf) ]]; then
+        sudo dnf install -y unzip
+    elif [[ -n $(command -v pacman) ]]; then
+        sudo pacman -Sy --noconfirm unzip
+    else
+        echo "Unrecognized package manager, please install unzip manually."
+        exit 1
+    fi
+
+    echo "Unzip has been successfully installed."
+else
+    echo "Unzip is installed."
+fi