linux installer script (#534)

Co-authored-by: Michael Yang <mxyng@pm.me>

scripts/install.sh

+#!/bin/sh
+# This script installs Ollama on Linux.
+# It detects the current operating system architecture and installs the appropriate version of Ollama.
+
+set -eu
+
+check_os() {
+    if [ "$(uname -s)" != "Linux" ]; then
+        echo "This script is intended to run on Linux only."
+        exit 1
+    fi
+}
+
+determine_architecture() {
+    ARCH=$(uname -m)
+    case $ARCH in
+        x86_64)
+            ARCH_SUFFIX="amd64"
+            ;;
+        aarch64|arm64)
+            ARCH_SUFFIX="arm64"
+            ;;
+        *)
+            echo "Unsupported architecture: $ARCH"
+            exit 1
+            ;;
+    esac
+}
+
+check_sudo() {
+    if [ "$(id -u)" -ne 0 ]; then
+        if command -v sudo >/dev/null 2>&1; then
+            SUDO_CMD="sudo"
+            echo "Downloading the ollama executable to the PATH, this will require sudo permissions."
+        else
+            echo "Error: sudo is not available. Please run as root or install sudo."
+            exit 1
+        fi
+    else
+        SUDO_CMD=""
+    fi
+}
+
+install_cuda_drivers() {
+    local os_name
+    if [ -f "/etc/os-release" ]; then
+        . /etc/os-release
+        os_name=$ID
+    else
+        echo "Unable to detect operating system. Skipping CUDA installation."
+        return 1
+    fi
+
+    # based on https://docs.nvidia.com/cuda/cuda-installation-guide-linux/index.html#package-manager-installation
+    case $os_name in
+        CentOS)
+            $SUDO_CMD yum install yum-utils
+            $SUDO_CMD yum-config-manager --add-repo https://developer.download.nvidia.com/compute/cuda/repos/rhel7/x86_64/cuda-rhel7.repo
+            $SUDO_CMD yum clean all
+            $SUDO_CMD yum -y install nvidia-driver-latest-dkms
+            $SUDO_CMD yum -y install cuda-driver
+            $SUDO_CMD yum install kernel-devel-$(uname -r) kernel-headers-$(uname -r)
+            $SUDO_CMD dkms status | awk -F: '/added/ { print $1 }' | xargs -n1 $SUDO_CMD dkms install
+            $SUDO_CMD modprobe nvidia
+            ;;
+        RedHatEnterprise*|Kylin|Fedora|SLES|openSUSE*|Microsoft|Ubuntu|Debian)
+            echo "NVIDIA CUDA drivers may not be installed, you can install them from: https://developer.nvidia.com/cuda-downloads"
+            ;;
+        *)
+            echo "Unsupported or unknown distribution, skipping GPU CUDA driver install: $os_name"
+            ;;
+    esac
+}
+
+check_install_cuda_drivers() {
+    if lspci -d '10de:' | grep 'NVIDIA' >/dev/null; then
+        # NVIDIA Corporation [10de] device is available
+        if command -v nvidia-smi >/dev/null 2>&1; then
+            CUDA_VERSION=$(nvidia-smi | grep -o "CUDA Version: [0-9]*\.[0-9]*")
+            if [ -z "$CUDA_VERSION" ]; then
+                echo "Warning: NVIDIA-SMI is available, but the CUDA version cannot be detected. Installing CUDA drivers..."
+                install_cuda_drivers
+            else
+                echo "Detected CUDA version $CUDA_VERSION"
+            fi
+        else
+            echo "Warning: NVIDIA GPU detected but NVIDIA-SMI is not available. Installing CUDA drivers..."
+            install_cuda_drivers
+        fi
+    else
+        echo "No NVIDIA GPU detected. Skipping driver installation."
+    fi
+}
+
+download_ollama() {
+    $SUDO_CMD mkdir -p /usr/bin
+    $SUDO_CMD curl -fsSL -o /usr/bin/ollama "https://ollama.ai/download/latest/ollama-linux-$ARCH_SUFFIX"
+}
+
+configure_systemd() {
+    if command -v systemctl >/dev/null 2>&1; then
+        $SUDO_CMD useradd -r -s /bin/false -m -d /home/ollama ollama 2>/dev/null 
+
+        echo "Creating systemd service file for ollama..."
+        cat <<EOF | $SUDO_CMD tee /etc/systemd/system/ollama.service >/dev/null
+[Unit]
+Description=Ollama Service
+After=network-online.target
+
+[Service]
+ExecStart=/usr/bin/ollama serve
+User=ollama
+Group=ollama
+Restart=always
+RestartSec=3
+Environment="HOME=/home/ollama"
+
+[Install]
+WantedBy=default.target
+EOF
+        echo "Reloading systemd and enabling ollama service..."
+        if [ "$(systemctl is-system-running || echo 'not running')" = 'running' ]; then 
+            $SUDO_CMD systemctl daemon-reload
+            $SUDO_CMD systemctl enable ollama
+            $SUDO_CMD systemctl restart ollama
+        fi
+    else
+        echo "Run 'ollama serve' from the command line to start the service."
+    fi
+}
+
+main() {
+    check_os
+    determine_architecture
+    check_sudo
+    download_ollama
+    configure_systemd
+    check_install_cuda_drivers
+    echo "Installation complete. You can now run 'ollama' from the command line."
+}
+
+main