feat: add install script

README.md

@@ -12,6 +12,17 @@ This PDK uses [PyO3](https://github.com/PyO3/pyo3) and [wizer](https://github.co
 
 We release the compiler as native binaries you can download and run. Check the [releases](https://github.com/extism/python-pdk/releases) page for the latest.
 
+## Install Script
+
+### Linux, macOS
+
+```bash
+curl -O https://raw.githubusercontent.com/extism/python-pdk/main/install.sh
+sh install.sh
+```
+
+This will install `extism-py` (and `wasm-merge`/`wasm-opt` if not already installed) to `$HOME/.local/bin` and create `$HOME/.local/share/extism-py`
+
 ### Testing the Install
 
 > *Note*: [Binaryen](https://github.com/WebAssembly/binaryen), specifically the `wasm-merge` and `wasm-opt` tools

install.sh

@@ -0,0 +1,71 @@
+set -e
+
+OS=''
+case `uname` in
+  Darwin*)  OS="macos" ;;
+  Linux*)   OS="linux" ;;
+  *)        echo "unknown os: $OSTYPE" && exit 1 ;;
+esac
+
+ARCH=`uname -m`
+case "$ARCH" in
+  ix86*|x86_64*)    ARCH="x86_64" ;;
+  arm64*|aarch64*)  ARCH="aarch64" ;;
+  *)                echo "unknown arch: $ARCH" && exit 1 ;;
+esac
+
+export TAG=v0.1.0
+export BINARYEN_TAG="version_116"
+
+curl -L -o /tmp/extism-py.tar.gz "https://github.com/extism/python-pdk/releases/download/$TAG/extism-py-$ARCH-$OS-$TAG.tar.gz"
+
+tar xzf /tmp/extism-py.tar.gz
+mkdir -p $HOME/.local/bin $HOME/.local/share/extism-py
+mv extism-py/bin/extism-py $HOME/.local/bin/extism-py
+rm -rf $HOME/.local/share/extism-py
+mv extism-py/share/extism-py $HOME/.local/share
+chmod +x $HOME/.local/bin/extism-py
+rm -r /tmp/extism-py.tar.gz extism-py
+
+if ! which "wasm-merge" > /dev/null || ! which "wasm-opt" > /dev/null; then
+  echo 'Missing binaryen tool(s)'
+
+  # binaryen use arm64 instead where as extism-py uses aarch64 for release file naming
+  case "$ARCH" in
+    aarch64*)  ARCH="arm64" ;;
+  esac
+
+  # matches the case where the user installs extism-pdk in a Linux-based Docker image running on mac m1
+  # binaryen didn't have arm64 release file for linux 
+  if [ $ARCH = "arm64" ] && [ $OS = "linux" ]; then
+    ARCH="x86_64"
+  fi
+
+  if [ $OS = "macos" ]; then
+    echo "Installing binaryen and wasm-merge using homebrew"
+    brew install binaryen
+  else
+    if [ ! -e "binaryen-$BINARYEN_TAG-$ARCH-$OS.tar.gz" ]; then
+      echo 'Downloading binaryen...'
+      curl -L -O "https://github.com/WebAssembly/binaryen/releases/download/$BINARYEN_TAG/binaryen-$BINARYEN_TAG-$ARCH-$OS.tar.gz"
+    fi
+    rm -rf 'binaryen' "binaryen-$BINARYEN_TAG"
+    tar xf "binaryen-$BINARYEN_TAG-$ARCH-$OS.tar.gz"
+    mv "binaryen-$BINARYEN_TAG"/ ./binaryen
+    if ! which 'wasm-merge' > /dev/null; then
+      echo "Installing wasm-merge..."
+      mv binaryen/bin/wasm-merge ~/.local/bin/wasm-merge
+    else
+      echo "wasm-merge is already installed"
+    fi
+    if ! which 'wasm-opt' > /dev/null; then
+      echo "Installing wasm-opt..."
+      mv binaryen/bin/wasm-opt ~/.local/bin/wasm-opt
+    else
+      echo "wasm-opt is already installed"
+    fi
+  fi
+  rm -rf ./binaryen
+else
+  echo "wasm-merge and wasm-opt are already installed"
+fi