Re: [PATCH v8 05/12] tests/vm: Add ability to select QEMU from current build.

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

On 5/29/20 10:34 PM, Robert Foley wrote:
> Added a new special variable QEMU_LOCAL=1, which
> will indicate to take the QEMU binary from the current
> build.
> 
> Signed-off-by: Robert Foley <robert.foley@linaro.org>
> Reviewed-by: Peter Puhov <peter.puhov@linaro.org>
> Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
> ---
>  tests/vm/Makefile.include |  4 ++++
>  tests/vm/basevm.py        | 23 ++++++++++++++++++++---
>  2 files changed, 24 insertions(+), 3 deletions(-)
> 
> diff --git a/tests/vm/Makefile.include b/tests/vm/Makefile.include
> index e22c391a2a..f6c3892bb2 100644
> --- a/tests/vm/Makefile.include
> +++ b/tests/vm/Makefile.include
> @@ -41,6 +41,7 @@ endif
>  	@echo "    J=[0..9]*            	 - Override the -jN parameter for make commands"
>  	@echo "    DEBUG=1              	 - Enable verbose output on host and interactive debugging"
>  	@echo "    V=1				 - Enable verbose ouput on host and guest commands"
> +	@echo "    QEMU_LOCAL=1                 - Use QEMU binary local to this build."
>  	@echo "    QEMU=/path/to/qemu		 - Change path to QEMU binary"
>  	@echo "    QEMU_IMG=/path/to/qemu-img	 - Change path to qemu-img tool"
>  ifeq ($(PYTHON_YAML),yes)
> @@ -63,6 +64,7 @@ $(IMAGES_DIR)/%.img:	$(SRC_PATH)/tests/vm/% \
>  		$(PYTHON) $< \
>  		$(if $(V)$(DEBUG), --debug) \
>  		$(if $(GENISOIMAGE),--genisoimage $(GENISOIMAGE)) \
> +		$(if $(QEMU_LOCAL),--build-path $(BUILD_DIR)) \
>  		--image "$@" \
>  		--force \
>  		--build-image $@, \
> @@ -77,6 +79,7 @@ vm-build-%: $(IMAGES_DIR)/%.img
>  		$(if $(DEBUG), --interactive) \
>  		$(if $(J),--jobs $(J)) \
>  		$(if $(V),--verbose) \
> +		$(if $(QEMU_LOCAL),--build-path $(BUILD_DIR)) \
>  		--image "$<" \
>  		$(if $(BUILD_TARGET),--build-target $(BUILD_TARGET)) \
>  		--snapshot \
> @@ -98,6 +101,7 @@ vm-boot-ssh-%: $(IMAGES_DIR)/%.img
>  		$(PYTHON) $(SRC_PATH)/tests/vm/$* \
>  		$(if $(J),--jobs $(J)) \
>  		$(if $(V)$(DEBUG), --debug) \
> +		$(if $(QEMU_LOCAL),--build-path $(BUILD_DIR)) \
>  		--image "$<" \
>  		--interactive \
>  		false, \
> diff --git a/tests/vm/basevm.py b/tests/vm/basevm.py
> index 7d23ae279b..75a7ac2bd3 100644
> --- a/tests/vm/basevm.py
> +++ b/tests/vm/basevm.py
> @@ -91,6 +91,7 @@ class BaseVM(object):
>      def __init__(self, args, config=None):
>          self._guest = None
>          self._genisoimage = args.genisoimage
> +        self._build_path = args.build_path
>          # Allow input config to override defaults.
>          self._config = DEFAULT_CONFIG.copy()
>          if config != None:
> @@ -275,15 +276,15 @@ class BaseVM(object):
>          args = self._args + boot_params.split(' ')
>          args += self._data_args + extra_args + self._config['extra_args']
>          logging.debug("QEMU args: %s", " ".join(args))
> -        qemu_bin = os.environ.get("QEMU", "qemu-system-" + self.arch)
> -        guest = QEMUMachine(binary=qemu_bin, args=args)
> +        qemu_path = get_qemu_path(self.arch, self._build_path)
> +        guest = QEMUMachine(binary=qemu_path, args=args)
>          guest.set_machine(self._config['machine'])
>          guest.set_console()
>          try:
>              guest.launch()
>          except:
>              logging.error("Failed to launch QEMU, command line:")
> -            logging.error(" ".join([qemu_bin] + args))
> +            logging.error(" ".join([qemu_path] + args))
>              logging.error("Log:")
>              logging.error(guest.get_log())
>              logging.error("QEMU version >= 2.10 is required")
> @@ -482,6 +483,19 @@ class BaseVM(object):
>                                stderr=self._stdout)
>          return os.path.join(cidir, "cloud-init.iso")
>  
> +def get_qemu_path(arch, build_path=None):
> +    """Fetch the path to the qemu binary."""
> +    # If QEMU environment variable set, it takes precedence
> +    if "QEMU" in os.environ:
> +        qemu_path = os.environ["QEMU"]
> +    elif build_path:
> +        qemu_path = os.path.join(build_path, arch + "-softmmu")
> +        qemu_path = os.path.join(qemu_path, "qemu-system-" + arch)
> +    else:
> +        # Default is to use system path for qemu.
> +        qemu_path = "qemu-system-" + arch
> +    return qemu_path
> +
>  def parse_config(config, args):
>      """ Parse yaml config and populate our config structure.
>          The yaml config allows the user to override the
> @@ -556,6 +570,9 @@ def parse_args(vmcls):
>      parser.add_option("--config", "-c", default=None,
>                        help="Provide config yaml for configuration. "\
>                             "See config_example.yaml for example.")
> +    parser.add_option("--build-path", default=None,
> +                      help="Path of build directory, "\
> +                           "for using build tree QEMU binary. ")
>      parser.disable_interspersed_args()
>      return parser.parse_args()
>  
> 

Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>