[setup] Ask whether this is a VM; install qemu-guest-agent

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

setup_ubuntu.sh

@@ -11,6 +11,19 @@ sudo apt -y update
 sudo apt -y dist-upgrade
 sudo apt -y install curl zsh tmux virtualenvwrapper powerline fonts-powerline python3 python3-pip python3-pynvim fzf
 sudo snap install --classic nvim
+
+# VMs: the guest agent lets the hypervisor read OS info (virsh guestinfo --os)
+default=N; [[ $(systemd-detect-virt 2>/dev/null) == @(kvm|qemu) ]] && default=Y
+read -r -p "Is this a VM? [$( [[ $default == Y ]] && echo Y/n || echo y/N )] " vm
+if [[ ${vm:-$default} == [yY]* ]]; then
+    sudo apt -y install qemu-guest-agent
+    # Static unit, started by udev; it only runs if the VM defines the channel
+    if [[ -e /dev/virtio-ports/org.qemu.guest_agent.0 ]]; then
+        sudo systemctl start qemu-guest-agent
+    else
+        echo "No guest agent channel: add org.qemu.guest_agent.0 to the VM definition" >&2
+    fi
+fi
 ./clone_and_link.sh; true
 if [ $SHELL != "/bin/zsh" ]; then
     chsh -s /usr/bin/zsh;

setup_ubuntu_shared.zsh

@@ -9,6 +9,19 @@ sudo apt -y update
 sudo apt -y dist-upgrade
 sudo apt -y install curl zsh tmux virtualenvwrapper powerline fonts-powerline python3 python3-pip python3-pynvim fzf
 sudo snap install --classic nvim
+
+# VMs: the guest agent lets the hypervisor read OS info (virsh guestinfo --os)
+default=N; [[ $(systemd-detect-virt 2>/dev/null) == (kvm|qemu) ]] && default=Y
+read -r "vm?Is this a VM? [$( [[ $default == Y ]] && echo Y/n || echo y/N )] "
+if [[ ${vm:-$default} == [yY]* ]]; then
+    sudo apt -y install qemu-guest-agent
+    # Static unit, started by udev; it only runs if the VM defines the channel
+    if [[ -e /dev/virtio-ports/org.qemu.guest_agent.0 ]]; then
+        sudo systemctl start qemu-guest-agent
+    else
+        echo "No guest agent channel: add org.qemu.guest_agent.0 to the VM definition" >&2
+    fi
+fi
 ./clone_and_link.sh shared; true
 if [ $SHELL != "/bin/zsh" ]; then
     chsh -s /usr/bin/zsh;