137 lines
3.8 KiB
Bash
Executable file
137 lines
3.8 KiB
Bash
Executable file
#!/usr/bin/env bash
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#
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# qvm-rebuild - Build the base qcow2 image from user's flake
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#
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# This script builds the QVM base image by:
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# - Ensuring a user flake exists (copying default if needed)
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# - Running nix build on the user's flake configuration
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# - Copying the resulting qcow2 to the base image location
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# - Optionally warning if VM is running
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#
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set -euo pipefail
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# Source common library
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QVM_LIB_DIR="${QVM_LIB_DIR:-$(dirname "$(readlink -f "$0")")/../lib}"
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# shellcheck source=lib/common.sh
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source "$QVM_LIB_DIR/common.sh"
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#
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# ensure_user_flake - Ensure user's flake exists, copy default if missing
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#
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ensure_user_flake() {
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if [[ -f "$QVM_USER_FLAKE/flake.nix" ]]; then
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log_info "Using existing user flake: $QVM_USER_FLAKE/flake.nix"
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return 0
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fi
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log_info "User flake not found, copying default template..."
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# Determine default flake location
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# In installed version: $QVM_LIB_DIR/../flake/default-vm/
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# In development: $(dirname "$0")/../flake/default-vm/
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local default_flake_dir="$QVM_LIB_DIR/../flake/default-vm"
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if [[ ! -d "$default_flake_dir" ]]; then
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die "Default flake template not found at: $default_flake_dir"
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fi
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if [[ ! -f "$default_flake_dir/flake.nix" ]]; then
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die "Default flake.nix not found at: $default_flake_dir/flake.nix"
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fi
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# Create user flake directory and copy template
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mkdir -p "$QVM_USER_FLAKE"
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cp -r "$default_flake_dir"/* "$QVM_USER_FLAKE/"
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log_info "Default flake copied to: $QVM_USER_FLAKE"
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echo ""
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echo "You can customize your VM by editing: $QVM_USER_FLAKE/flake.nix"
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echo ""
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}
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#
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# build_base_image - Build the base image using nix
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#
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build_base_image() {
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log_info "Building base image from flake..."
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# Build the qcow2 output from user's flake
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local build_result="$QVM_STATE_DIR/result"
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if ! nix build "$QVM_USER_FLAKE#qcow2" --out-link "$build_result"; then
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die "Failed to build base image. Check your flake configuration at: $QVM_USER_FLAKE/flake.nix"
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fi
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# Verify the result contains nixos.qcow2
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local qcow2_path="$build_result/nixos.qcow2"
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if [[ ! -f "$qcow2_path" ]]; then
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die "Build succeeded but nixos.qcow2 not found at: $qcow2_path"
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fi
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# Copy the qcow2 to base image location
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log_info "Copying image to: $QVM_BASE_IMAGE"
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cp -L "$qcow2_path" "$QVM_BASE_IMAGE"
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# Remove the result symlink
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rm -f "$build_result"
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# Get image size for informational output
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local image_size
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image_size=$(du -h "$QVM_BASE_IMAGE" | cut -f1)
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log_info "Base image built successfully"
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echo ""
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echo "Base image: $QVM_BASE_IMAGE"
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echo "Image size: $image_size"
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}
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#
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# warn_if_running - Warn user if VM is currently running
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#
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warn_if_running() {
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if is_vm_running; then
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log_warn "VM is currently running"
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echo ""
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echo "The new base image will only take effect after restarting the VM:"
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echo " qvm stop"
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echo " qvm start"
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echo ""
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echo "Note: Changes to your VM overlay will be preserved."
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echo " Use 'qvm reset' to start fresh with the new base image."
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echo ""
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fi
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}
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#
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# main - Main execution flow
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#
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main() {
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log_info "Rebuilding QVM base image..."
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# Ensure required directories exist
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ensure_dirs
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# Ensure user has a flake configuration
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ensure_user_flake
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# Build the base image
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build_base_image
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# Warn if VM is running
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warn_if_running
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# Print next steps
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echo "Next steps:"
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if is_vm_running; then
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echo " 1. Stop the VM: qvm stop"
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echo " 2. Start the VM: qvm start"
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else
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echo " - Start the VM: qvm start"
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fi
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echo " - Customize the VM: edit $QVM_USER_FLAKE/flake.nix"
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echo " - Reset to fresh state: qvm reset"
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}
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# Run main function
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main "$@"
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