u-boot/test/py/u_boot_console_base.py

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# Copyright (c) 2015 Stephen Warren
# Copyright (c) 2015-2016, NVIDIA CORPORATION. All rights reserved.
#
# SPDX-License-Identifier: GPL-2.0
# Common logic to interact with U-Boot via the console. This class provides
# the interface that tests use to execute U-Boot shell commands and wait for
# their results. Sub-classes exist to perform board-type-specific setup
# operations, such as spawning a sub-process for Sandbox, or attaching to the
# serial console of real hardware.
import multiplexed_log
import os
import pytest
import re
import sys
import u_boot_spawn
# Regexes for text we expect U-Boot to send to the console.
pattern_u_boot_spl_signon = re.compile('(U-Boot SPL \\d{4}\\.\\d{2}[^\r\n]*\\))')
pattern_u_boot_main_signon = re.compile('(U-Boot \\d{4}\\.\\d{2}[^\r\n]*\\))')
pattern_stop_autoboot_prompt = re.compile('Hit any key to stop autoboot: ')
pattern_unknown_command = re.compile('Unknown command \'.*\' - try \'help\'')
pattern_error_notification = re.compile('## Error: ')
pattern_error_please_reset = re.compile('### ERROR ### Please RESET the board ###')
PAT_ID = 0
PAT_RE = 1
bad_pattern_defs = (
('spl_signon', pattern_u_boot_spl_signon),
('main_signon', pattern_u_boot_main_signon),
('stop_autoboot_prompt', pattern_stop_autoboot_prompt),
('unknown_command', pattern_unknown_command),
('error_notification', pattern_error_notification),
('error_please_reset', pattern_error_please_reset),
)
class ConsoleDisableCheck(object):
"""Context manager (for Python's with statement) that temporarily disables
the specified console output error check. This is useful when deliberately
executing a command that is known to trigger one of the error checks, in
order to test that the error condition is actually raised. This class is
used internally by ConsoleBase::disable_check(); it is not intended for
direct usage."""
def __init__(self, console, check_type):
self.console = console
self.check_type = check_type
def __enter__(self):
self.console.disable_check_count[self.check_type] += 1
self.console.eval_bad_patterns()
def __exit__(self, extype, value, traceback):
self.console.disable_check_count[self.check_type] -= 1
self.console.eval_bad_patterns()
class ConsoleSetupTimeout(object):
"""Context manager (for Python's with statement) that temporarily sets up
timeout for specific command. This is useful when execution time is greater
then default 30s."""
def __init__(self, console, timeout):
self.p = console.p
self.orig_timeout = self.p.timeout
self.p.timeout = timeout
def __enter__(self):
return self
def __exit__(self, extype, value, traceback):
self.p.timeout = self.orig_timeout
class ConsoleBase(object):
"""The interface through which test functions interact with the U-Boot
console. This primarily involves executing shell commands, capturing their
results, and checking for common error conditions. Some common utilities
are also provided too."""
def __init__(self, log, config, max_fifo_fill):
"""Initialize a U-Boot console connection.
Can only usefully be called by sub-classes.
Args:
log: A mulptiplex_log.Logfile object, to which the U-Boot output
will be logged.
config: A configuration data structure, as built by conftest.py.
max_fifo_fill: The maximum number of characters to send to U-Boot
command-line before waiting for U-Boot to echo the characters
back. For UART-based HW without HW flow control, this value
should be set less than the UART RX FIFO size to avoid
overflow, assuming that U-Boot can't keep up with full-rate
traffic at the baud rate.
Returns:
Nothing.
"""
self.log = log
self.config = config
self.max_fifo_fill = max_fifo_fill
self.logstream = self.log.get_stream('console', sys.stdout)
# Array slice removes leading/trailing quotes
self.prompt = self.config.buildconfig['config_sys_prompt'][1:-1]
self.prompt_escaped = re.escape(self.prompt)
self.p = None
self.disable_check_count = {pat[PAT_ID]: 0 for pat in bad_pattern_defs}
self.eval_bad_patterns()
self.at_prompt = False
self.at_prompt_logevt = None
def eval_bad_patterns(self):
self.bad_patterns = [pat[PAT_RE] for pat in bad_pattern_defs \
if self.disable_check_count[pat[PAT_ID]] == 0]
self.bad_pattern_ids = [pat[PAT_ID] for pat in bad_pattern_defs \
if self.disable_check_count[pat[PAT_ID]] == 0]
def close(self):
"""Terminate the connection to the U-Boot console.
This function is only useful once all interaction with U-Boot is
complete. Once this function is called, data cannot be sent to or
received from U-Boot.
Args:
None.
Returns:
Nothing.
"""
if self.p:
self.p.close()
self.logstream.close()
def run_command(self, cmd, wait_for_echo=True, send_nl=True,
wait_for_prompt=True):
"""Execute a command via the U-Boot console.
The command is always sent to U-Boot.
U-Boot echoes any command back to its output, and this function
typically waits for that to occur. The wait can be disabled by setting
wait_for_echo=False, which is useful e.g. when sending CTRL-C to
interrupt a long-running command such as "ums".
Command execution is typically triggered by sending a newline
character. This can be disabled by setting send_nl=False, which is
also useful when sending CTRL-C.
This function typically waits for the command to finish executing, and
returns the console output that it generated. This can be disabled by
setting wait_for_prompt=False, which is useful when invoking a long-
running command such as "ums".
Args:
cmd: The command to send.
wait_for_each: Boolean indicating whether to wait for U-Boot to
echo the command text back to its output.
send_nl: Boolean indicating whether to send a newline character
after the command string.
wait_for_prompt: Boolean indicating whether to wait for the
command prompt to be sent by U-Boot. This typically occurs
immediately after the command has been executed.
Returns:
If wait_for_prompt == False:
Nothing.
Else:
The output from U-Boot during command execution. In other
words, the text U-Boot emitted between the point it echod the
command string and emitted the subsequent command prompts.
"""
if self.at_prompt and \
self.at_prompt_logevt != self.logstream.logfile.cur_evt:
self.logstream.write(self.prompt, implicit=True)
try:
self.at_prompt = False
if send_nl:
cmd += '\n'
while cmd:
# Limit max outstanding data, so UART FIFOs don't overflow
chunk = cmd[:self.max_fifo_fill]
cmd = cmd[self.max_fifo_fill:]
self.p.send(chunk)
if not wait_for_echo:
continue
chunk = re.escape(chunk)
chunk = chunk.replace('\\\n', '[\r\n]')
m = self.p.expect([chunk] + self.bad_patterns)
if m != 0:
self.at_prompt = False
raise Exception('Bad pattern found on console: ' +
self.bad_pattern_ids[m - 1])
if not wait_for_prompt:
return
m = self.p.expect([self.prompt_escaped] + self.bad_patterns)
if m != 0:
self.at_prompt = False
raise Exception('Bad pattern found on console: ' +
self.bad_pattern_ids[m - 1])
self.at_prompt = True
self.at_prompt_logevt = self.logstream.logfile.cur_evt
# Only strip \r\n; space/TAB might be significant if testing
# indentation.
return self.p.before.strip('\r\n')
except Exception as ex:
self.log.error(str(ex))
self.cleanup_spawn()
raise
def ctrlc(self):
"""Send a CTRL-C character to U-Boot.
This is useful in order to stop execution of long-running synchronous
commands such as "ums".
Args:
None.
Returns:
Nothing.
"""
self.log.action('Sending Ctrl-C')
self.run_command(chr(3), wait_for_echo=False, send_nl=False)
def wait_for(self, text):
"""Wait for a pattern to be emitted by U-Boot.
This is useful when a long-running command such as "dfu" is executing,
and it periodically emits some text that should show up at a specific
location in the log file.
Args:
text: The text to wait for; either a string (containing raw text,
not a regular expression) or an re object.
Returns:
Nothing.
"""
if type(text) == type(''):
text = re.escape(text)
m = self.p.expect([text] + self.bad_patterns)
if m != 0:
raise Exception('Bad pattern found on console: ' +
self.bad_pattern_ids[m - 1])
def drain_console(self):
"""Read from and log the U-Boot console for a short time.
U-Boot's console output is only logged when the test code actively
waits for U-Boot to emit specific data. There are cases where tests
can fail without doing this. For example, if a test asks U-Boot to
enable USB device mode, then polls until a host-side device node
exists. In such a case, it is useful to log U-Boot's console output
in case U-Boot printed clues as to why the host-side even did not
occur. This function will do that.
Args:
None.
Returns:
Nothing.
"""
# If we are already not connected to U-Boot, there's nothing to drain.
# This should only happen when a previous call to run_command() or
# wait_for() failed (and hence the output has already been logged), or
# the system is shutting down.
if not self.p:
return
orig_timeout = self.p.timeout
try:
# Drain the log for a relatively short time.
self.p.timeout = 1000
# Wait for something U-Boot will likely never send. This will
# cause the console output to be read and logged.
self.p.expect(['This should never match U-Boot output'])
except u_boot_spawn.Timeout:
pass
finally:
self.p.timeout = orig_timeout
def ensure_spawned(self):
"""Ensure a connection to a correctly running U-Boot instance.
This may require spawning a new Sandbox process or resetting target
hardware, as defined by the implementation sub-class.
This is an internal function and should not be called directly.
Args:
None.
Returns:
Nothing.
"""
if self.p:
return
try:
self.log.start_section('Starting U-Boot')
self.at_prompt = False
self.p = self.get_spawn()
# Real targets can take a long time to scroll large amounts of
# text if LCD is enabled. This value may need tweaking in the
# future, possibly per-test to be optimal. This works for 'help'
# on board 'seaboard'.
test/py: support running sandbox under gdbserver Implement command--line option --gdbserver COMM, which does two things: a) Run the sandbox process under gdbserver, using COMM as gdbserver's communication channel. b) Disables all timeouts, so that if U-Boot is halted under the debugger, tests don't fail. If the user gives up in the middle of a debugging session, they can simply CTRL-C the test script to abort it. This allows easy debugging of test failures without having to manually re-create the failure conditions. Usage is: Window 1: ./test/py/test.py --bd sandbox --gdbserver localhost:1234 Window 2: gdb ./build-sandbox/u-boot -ex 'target remote localhost:1234' When using this option, it likely makes sense to use pytest's -k option to limit the set of tests that are executed. Simply running U-Boot directly under gdb (rather than gdbserver) was also considered. However, this was rejected because: a) gdb's output would then be processed by the test script, and likely confuse it causing false failures. b) pytest by default hides stdout from tests, which would prevent the user from interacting with gdb. While gdb can be told to redirect the debugee's stdio to a separate PTY, this would appear to leave gdb's stdio directed at the test scripts and the debugee's stdio directed elsewhere, which is the opposite of the desired effect. Perhaps some complicated PTY muxing and process hierarchy could invert this. However, the current scheme is simple to implement and use, so it doesn't seem worth complicating matters. c) Using gdbserver allows arbitrary debuggers to be used, even those with a GUI. If the test scripts invoked the debugger themselves, they'd have to know how to execute arbitary applications. While the user could hide this all in a wrapper script, this feels like extra complication. An interesting future idea might be a --gdb-screen option, which could spawn both U-Boot and gdb separately, and spawn the screen into a newly created window under screen. Similar options could be envisaged for creating a new xterm/... too. --gdbserver currently only supports sandbox, and not real hardware. That's primarily because the test hooks are responsible for all aspects of hardware control, so there's nothing for the test scripts themselves can do to enable gdbserver on real hardware. We might consider introducing a separate --disable-timeouts option to support use of debuggers on real hardware, and having --gdbserver imply that option. Signed-off-by: Stephen Warren <swarren@nvidia.com>
2016-02-04 23:11:50 +00:00
if not self.config.gdbserver:
self.p.timeout = 30000
self.p.logfile_read = self.logstream
bcfg = self.config.buildconfig
config_spl = bcfg.get('config_spl', 'n') == 'y'
config_spl_serial_support = bcfg.get('config_spl_serial_support',
'n') == 'y'
env_spl_skipped = self.config.env.get('env__spl_skipped',
False)
if config_spl and config_spl_serial_support and not env_spl_skipped:
m = self.p.expect([pattern_u_boot_spl_signon] +
self.bad_patterns)
if m != 0:
raise Exception('Bad pattern found on console: ' +
self.bad_pattern_ids[m - 1])
m = self.p.expect([pattern_u_boot_main_signon] + self.bad_patterns)
if m != 0:
raise Exception('Bad pattern found on console: ' +
self.bad_pattern_ids[m - 1])
self.u_boot_version_string = self.p.after
while True:
m = self.p.expect([self.prompt_escaped,
pattern_stop_autoboot_prompt] + self.bad_patterns)
if m == 0:
break
if m == 1:
self.p.send(' ')
continue
raise Exception('Bad pattern found on console: ' +
self.bad_pattern_ids[m - 2])
self.at_prompt = True
self.at_prompt_logevt = self.logstream.logfile.cur_evt
except Exception as ex:
self.log.error(str(ex))
self.cleanup_spawn()
raise
finally:
self.log.end_section('Starting U-Boot')
def cleanup_spawn(self):
"""Shut down all interaction with the U-Boot instance.
This is used when an error is detected prior to re-establishing a
connection with a fresh U-Boot instance.
This is an internal function and should not be called directly.
Args:
None.
Returns:
Nothing.
"""
try:
if self.p:
self.p.close()
except:
pass
self.p = None
def validate_version_string_in_text(self, text):
"""Assert that a command's output includes the U-Boot signon message.
This is primarily useful for validating the "version" command without
duplicating the signon text regex in a test function.
Args:
text: The command output text to check.
Returns:
Nothing. An exception is raised if the validation fails.
"""
assert(self.u_boot_version_string in text)
def disable_check(self, check_type):
"""Temporarily disable an error check of U-Boot's output.
Create a new context manager (for use with the "with" statement) which
temporarily disables a particular console output error check.
Args:
check_type: The type of error-check to disable. Valid values may
be found in self.disable_check_count above.
Returns:
A context manager object.
"""
return ConsoleDisableCheck(self, check_type)
def temporary_timeout(self, timeout):
"""Temporarily set up different timeout for commands.
Create a new context manager (for use with the "with" statement) which
temporarily change timeout.
Args:
timeout: Time in milliseconds.
Returns:
A context manager object.
"""
return ConsoleSetupTimeout(self, timeout)