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#!/usr/bin/env python3 # Copyright: 2026 Hector CAO <hector.cao@canonical.com> # SPDX-License-Identifier: GPL-3.0-or-later """ubuntu-virt-helper: manage base and hwe stacks.""" import argparse import subprocess import sys # Source packages considered part of the virt stack _VIRT_SOURCES = {"qemu", "qemu-hwe", "edk2", "edk2-hwe", "seabios", "seabios-hwe", "libvirt", "libvirt-hwe"} def get_all_virt_installed_packages(): """Get list of all installed packages with their source and version. Returns: variant: variant package (ubuntu-virt or ubuntu-virt-hwe) List of installed virt-related packages. """ variant = None virt_packages = [] mark_manual = get_package_manual() result = subprocess.run( ["dpkg-query", "-W", "-f=${binary:Package}\t${Version}\t${source:Package}\t${Status}\n"], capture_output=True, text=True, check=False, ) for line in result.stdout.splitlines(): parts = line.split("\t", 3) if len(parts) == 4: pkg, version, src, status = parts # only consider packages that are installed (status contains "installed") if "installed" not in status: continue # detect variant # dpkg-query might return package name with :arch suffix (e.g libvirt0:amd64) pkg_name = pkg.split(":")[0] if pkg_name == 'ubuntu-virt-hwe' or pkg_name == 'ubuntu-virt': if variant: print(f"Warning: Multiple ubuntu-virt variants detected") else: variant = pkg_name # collect packages with virt-related sources if src in _VIRT_SOURCES: virt_packages.append((pkg, version, src, pkg_name in mark_manual)) return variant, virt_packages def get_package_manual(): """Retrieve lists of packages marked as manual. Returns: List of packages marked as manual. """ manual_packages = set() # Get manually installed packages result = subprocess.run( ["apt-mark", "showmanual"], capture_output=True, text=True, check=False, ) if result.returncode == 0: manual_packages = set(result.stdout.strip().splitlines()) return manual_packages def cmd_status(args): """Show currently installed variant.""" variant, packages = get_all_virt_installed_packages() if variant == "ubuntu-virt": print("Installed variant: base") elif variant == "ubuntu-virt-hwe": print("Installed variant: hwe") else: print("Installed variant: none") if packages: print("\n{} packages:".format(len(packages))) for pkg, version, src, manual in packages: if args.verbose: manual_str = "manual" if manual else "auto" print(f" - {pkg} ({version}, src:{src}, {manual_str})") else: print(f" - {pkg} ({version}, src:{src})") else: print("\nNo packages installed") return 0 def cmd_switch(args): """Switch to the other virt variant.""" variant, packages = get_all_virt_installed_packages() if variant == "ubuntu-virt": print(f"Switching from base to hwe variant...") elif variant == "ubuntu-virt-hwe": print(f"Switching from hwe to base variant...") else: print("No virt variant currently installed. Cannot switch.") return 1 # build the counterpart packages, skip special packages only available in 1 variant counterpart_packages = [] skipped = {'ubuntu-helper-virt-hwe'} for pkg, version, src, manual in packages: if pkg in skipped: continue pkg_name = pkg.split(":")[0] pkg_arch = pkg.split(":")[1] if ":" in pkg else None if variant == "ubuntu-virt": pkg_name = pkg_name + '-hwe' elif variant == "ubuntu-virt-hwe" and pkg_name.endswith("-hwe"): pkg_name = pkg_name[:-4] counterpart_pkg = pkg_name + (f":{pkg_arch}" if pkg_arch else "") # check of the counterpart package exists in the repositories before adding it to the list result = subprocess.run( ["apt-cache", "show", counterpart_pkg], capture_output=True, text=True, check=False, ) if result.returncode != 0: print(f"Warning: counterpart package {counterpart_pkg} not found in repositories, skipping") continue counterpart_packages.append((counterpart_pkg, manual)) # Run apt install for the target variant apt_install_args = args.apt_install_args or [] if apt_install_args and apt_install_args[0] == "--": apt_install_args = apt_install_args[1:] try: apt_install_cmd = ["apt", "install"] + apt_install_args + [p[0] for p in counterpart_packages] if args.verbose: print("Running: {}".format(" ".join(apt_install_cmd))) result = subprocess.run( apt_install_cmd, check=False, ) if result.returncode != 0: return result.returncode except Exception as e: print(f"Error: Failed to run apt install: {e}") return 1 # restore auto marks if not marked as manual in the original variant # this is best effort so ignore all errors and just print a warning if it fails auto_pkgs = [p[0] for p in counterpart_packages if not p[1]] print("Restoring auto marks for packages: {}".format(", ".join(auto_pkgs))) try: result = subprocess.run( ["apt-mark", "auto"] + auto_pkgs, check=False, ) except Exception as e: print(f"Error: Failed to run apt-mark auto: {e}") return 0 def main(): """Main entry point.""" parser = argparse.ArgumentParser( prog="ubuntu_virt_helper", description="Detect ubuntu-virt package variants", ) parser.add_argument( "-v", "--verbose", action="store_true", help="Enable verbose output", ) subparsers = parser.add_subparsers(dest="command", help="Command") # Status command status = subparsers.add_parser("status", help="Show installed variant") # Switch command switch = subparsers.add_parser("switch", help="Switch to the other virt variant") switch.add_argument( "apt_install_args", nargs=argparse.REMAINDER, help="Arguments passed through to apt install (use '--' before them)", ) args = parser.parse_args() if not args.command: # Default to status args.command = "status" if args.command == "status": return cmd_status(args) elif args.command == "switch": return cmd_switch(args) else: parser.print_help() return 1 if __name__ == "__main__": try: main() except KeyboardInterrupt: pass except Exception as e: print(f"ubuntu_virt_helper: warning: unexpected error: {e}", file=sys.stderr) raise SystemExit(0)