tests/vm: switch from optsparse to argparse

optparse has been deprecated since version 3.2 and argparse is the
blessed replacement. Take the opportunity to enhance our help output
showing defaults when called.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Robert Foley <robert.foley@linaro.org>

Message-Id: <20200701135652.1366-15-alex.bennee@linaro.org>

1 files changed, 48 insertions, 45 deletions

diff --git a/tests/vm/basevm.py b/tests/vm/basevm.py
index 4c2878f022..cc0809b6c7 100644
--- a/tests/vm/basevm.py
+++ b/tests/vm/basevm.py
@@ -23,7 +23,7 @@ from qemu.accel import kvm_available
 from qemu.machine import QEMUMachine
 import subprocess
 import hashlib
-import optparse
+import argparse
 import atexit
 import tempfile
 import shutil
@@ -556,54 +556,57 @@ def parse_args(vmcls):
         else:
             return 1
 
-    parser = optparse.OptionParser(
-        description="VM test utility.  Exit codes: "
-                    "0 = success, "
-                    "1 = command line error, "
-                    "2 = environment initialization failed, "
-                    "3 = test command failed")
-    parser.add_option("--debug", "-D", action="store_true",
-                      help="enable debug output")
-    parser.add_option("--image", "-i", default="%s.img" % vmcls.name,
-                      help="image file name")
-    parser.add_option("--force", "-f", action="store_true",
-                      help="force build image even if image exists")
-    parser.add_option("--jobs", type=int, default=get_default_jobs(),
-                      help="number of virtual CPUs")
-    parser.add_option("--verbose", "-V", action="store_true",
-                      help="Pass V=1 to builds within the guest")
-    parser.add_option("--build-image", "-b", action="store_true",
-                      help="build image")
-    parser.add_option("--build-qemu",
-                      help="build QEMU from source in guest")
-    parser.add_option("--build-target",
-                      help="QEMU build target", default="check")
-    parser.add_option("--build-path", default=None,
-                      help="Path of build directory, "\
-                           "for using build tree QEMU binary. ")
-    parser.add_option("--interactive", "-I", action="store_true",
-                      help="Interactively run command")
-    parser.add_option("--snapshot", "-s", action="store_true",
-                      help="run tests with a snapshot")
-    parser.add_option("--genisoimage", default="genisoimage",
-                      help="iso imaging tool")
-    parser.add_option("--config", "-c", default=None,
-                      help="Provide config yaml for configuration. "\
-                           "See config_example.yaml for example.")
-    parser.add_option("--efi-aarch64",
-                      default="/usr/share/qemu-efi-aarch64/QEMU_EFI.fd",
-                      help="Path to efi image for aarch64 VMs.")
-    parser.add_option("--log-console", action="store_true",
-                      help="Log console to file.")
-    parser.disable_interspersed_args()
+    parser = argparse.ArgumentParser(
+        formatter_class=argparse.ArgumentDefaultsHelpFormatter,
+        description="Utility for provisioning VMs and running builds",
+        epilog="""Remaining arguments are passed to the command.
+        Exit codes: 0 = success, 1 = command line error,
+        2 = environment initialization failed,
+        3 = test command failed""")
+    parser.add_argument("--debug", "-D", action="store_true",
+                        help="enable debug output")
+    parser.add_argument("--image", "-i", default="%s.img" % vmcls.name,
+                        help="image file name")
+    parser.add_argument("--force", "-f", action="store_true",
+                        help="force build image even if image exists")
+    parser.add_argument("--jobs", type=int, default=get_default_jobs(),
+                        help="number of virtual CPUs")
+    parser.add_argument("--verbose", "-V", action="store_true",
+                        help="Pass V=1 to builds within the guest")
+    parser.add_argument("--build-image", "-b", action="store_true",
+                        help="build image")
+    parser.add_argument("--build-qemu",
+                        help="build QEMU from source in guest")
+    parser.add_argument("--build-target",
+                        help="QEMU build target", default="check")
+    parser.add_argument("--build-path", default=None,
+                        help="Path of build directory, "\
+                        "for using build tree QEMU binary. ")
+    parser.add_argument("--interactive", "-I", action="store_true",
+                        help="Interactively run command")
+    parser.add_argument("--snapshot", "-s", action="store_true",
+                        help="run tests with a snapshot")
+    parser.add_argument("--genisoimage", default="genisoimage",
+                        help="iso imaging tool")
+    parser.add_argument("--config", "-c", default=None,
+                        help="Provide config yaml for configuration. "\
+                        "See config_example.yaml for example.")
+    parser.add_argument("--efi-aarch64",
+                        default="/usr/share/qemu-efi-aarch64/QEMU_EFI.fd",
+                        help="Path to efi image for aarch64 VMs.")
+    parser.add_argument("--log-console", action="store_true",
+                        help="Log console to file.")
+    parser.add_argument("commands", nargs="*", help="""Remaining
+        commands after -- are passed to command inside the VM""")
+
     return parser.parse_args()
 
 def main(vmcls, config=None):
     try:
         if config == None:
             config = DEFAULT_CONFIG
-        args, argv = parse_args(vmcls)
-        if not argv and not args.build_qemu and not args.build_image:
+        args = parse_args(vmcls)
+        if not args.commands and not args.build_qemu and not args.build_image:
             print("Nothing to do?")
             return 1
         config = parse_config(config, args)
@@ -619,12 +622,12 @@ def main(vmcls, config=None):
         if args.build_qemu:
             vm.add_source_dir(args.build_qemu)
             cmd = [vm.BUILD_SCRIPT.format(
-                   configure_opts = " ".join(argv),
+                   configure_opts = " ".join(args.commands),
                    jobs=int(args.jobs),
                    target=args.build_target,
                    verbose = "V=1" if args.verbose else "")]
         else:
-            cmd = argv
+            cmd = args.commands
         img = args.image
         if args.snapshot:
             img += ",snapshot=on"