add install.sh

install.sh

@@ -0,0 +1,44 @@
+#!/bin/bash
+
+# Script to install the Porter CLI on macOS, Linux, and WSL
+
+osname=""
+
+check_prereqs() {
+    command -v curl >/dev/null 2>&1 || { echo "[ERROR] curl is required to install the Porter CLI." >&2; exit 1; }
+    command -v unzip >/dev/null 2>&1 || { echo "[ERROR] unzip is required to install the Porter CLI." >&2; exit 1; }
+}
+
+download_and_install() {
+    check_prereqs
+
+    echo "[INFO] Since the Porter CLI gets installed in /usr/local/bin, you may be asked to input your password."
+
+    name=$(curl -s https://api.github.com/repos/porter-dev/porter/releases/latest | grep "browser_download_url.*/porter_.*_${osname}_x86_64\.zip" | cut -d ":" -f 2,3 | tr -d \")
+    name=$(basename $name)
+
+    curl -L https://github.com/porter-dev/porter/releases/latest/download/$name --output $name
+    unzip -a $name
+    rm $name
+
+    chmod +x ./porter
+    sudo mv ./porter /usr/local/bin/porter
+
+    command -v porter >/dev/null 2>&1 || { echo "[ERROR] There was an error installing the Porter CLI. Please try again." >&2; exit 1; }
+
+    exit
+}
+
+if [[ "$OSTYPE" == "linux-gnu"* ]]; then
+    if uname -a | grep -q '^Linux.*Microsoft'; then
+        echo "[WARNING] WSL support is experimental and may result in crashes."
+    fi
+    osname="Linux"
+    download_and_install
+elif [[ "$OSTYPE" == "darwin"* ]]; then
+    osname="Darwin"
+    download_and_install
+fi
+
+echo "[ERROR] Unsupported operating system."
+exit 1