do not start ollama app in headless

Allow installing Ollama on MacOS directly from the command line. This is inline with other CLI tools and results in a more streamlined experience when the user is looking to use the CLI specifically.

.github/workflows/test-install.yaml

@@ -0,0 +1,22 @@
+name: test-install
+
+on:
+  pull_request:
+    paths:
+      - 'scripts/install.sh'
+      - '.github/workflows/test-install.yaml'
+
+jobs:
+  test:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Run install script
+        run: sh ./scripts/install.sh
+        env:
+          OLLAMA_NO_START: 1
+      - name: Verify ollama is available
+        run: ollama --version

scripts/install.sh

@@ -1,5 +1,5 @@
 #!/bin/sh
-# This script installs Ollama on Linux.
+# This script installs Ollama on Linux and macOS.
 # It detects the current operating system architecture and installs the appropriate version of Ollama.
 
 set -eu
@@ -27,8 +27,7 @@ require() {
     echo $MISSING
 }
 
-[ "$(uname -s)" = "Linux" ] || error 'This script is intended to run on Linux only.'
-
+OS="$(uname -s)"
 ARCH=$(uname -m)
 case "$ARCH" in
     x86_64) ARCH="amd64" ;;
@@ -36,6 +35,65 @@ case "$ARCH" in
     *) error "Unsupported architecture: $ARCH" ;;
 esac
 
+###########################################
+# macOS
+###########################################
+
+if [ "$OS" = "Darwin" ]; then
+    NEEDS=$(require curl unzip)
+    if [ -n "$NEEDS" ]; then
+        status "ERROR: The following tools are required but missing:"
+        for NEED in $NEEDS; do
+            echo "  - $NEED"
+        done
+        exit 1
+    fi
+
+    if [ -n "${OLLAMA_VERSION:-}" ]; then
+        DOWNLOAD_URL="https://github.com/ollama/ollama/releases/download/${OLLAMA_VERSION}/Ollama-darwin.zip"
+    else
+        DOWNLOAD_URL="https://github.com/ollama/ollama/releases/latest/download/Ollama-darwin.zip"
+    fi
+
+    if pgrep -x Ollama >/dev/null 2>&1; then
+        status "Stopping running Ollama instance..."
+        pkill -x Ollama 2>/dev/null || true
+        sleep 2
+    fi
+
+    if [ -d "/Applications/Ollama.app" ]; then
+        status "Removing existing Ollama installation..."
+        rm -rf "/Applications/Ollama.app"
+    fi
+
+    status "Downloading Ollama for macOS..."
+    curl --fail --show-error --location --progress-bar \
+        -o "$TEMP_DIR/Ollama-darwin.zip" "$DOWNLOAD_URL"
+
+    status "Installing Ollama to /Applications..."
+    unzip -q "$TEMP_DIR/Ollama-darwin.zip" -d "$TEMP_DIR"
+    mv "$TEMP_DIR/Ollama.app" "/Applications/"
+
+    status "Adding 'ollama' command to PATH (may require password)..."
+    mkdir -p "/usr/local/bin" 2>/dev/null || sudo mkdir -p "/usr/local/bin"
+    ln -sf "/Applications/Ollama.app/Contents/Resources/ollama" "/usr/local/bin/ollama" 2>/dev/null || \
+        sudo ln -sf "/Applications/Ollama.app/Contents/Resources/ollama" "/usr/local/bin/ollama"
+
+    if [ -z "$OLLAMA_NO_START" ]; then
+        status "Starting Ollama..."
+        open -a Ollama --args hidden
+    fi
+
+    status "Install complete. You can now run 'ollama'."
+    exit 0
+fi
+
+###########################################
+# Linux
+###########################################
+
+[ "$OS" = "Linux" ] || error 'This script is intended to run on Linux and macOS only.'
+
 IS_WSL2=false
 
 KERN=$(uname -r)