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77b426703d
u-boot/test/image/test-fit.py
Simon Glass 77b426703d test: Convert the FIT test to test/py 
Convert this test to use the pytest framework.

Signed-off-by: Simon Glass <sjg@chromium.org>
2017-08-13 15:17:36 -04:00

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# Copyright (c) 2013, Google Inc.
#
# SPDX-License-Identifier: GPL-2.0+
#
# Sanity check of the FIT handling in U-Boot
import os
import pytest
import struct
import u_boot_utils as util
# Define a base ITS which we can adjust using % and a dictionary
base_its = '''
/dts-v1/;
/ {
description = "Chrome OS kernel image with one or more FDT blobs";
#address-cells = <1>;
images {
kernel@1 {
data = /incbin/("%(kernel)s");
type = "kernel";
arch = "sandbox";
os = "linux";
compression = "none";
load = <0x40000>;
entry = <0x8>;
};
kernel@2 {
data = /incbin/("%(loadables1)s");
type = "kernel";
arch = "sandbox";
os = "linux";
compression = "none";
%(loadables1_load)s
entry = <0x0>;
};
fdt@1 {
description = "snow";
data = /incbin/("u-boot.dtb");
type = "flat_dt";
arch = "sandbox";
%(fdt_load)s
compression = "none";
signature@1 {
algo = "sha1,rsa2048";
key-name-hint = "dev";
};
};
ramdisk@1 {
description = "snow";
data = /incbin/("%(ramdisk)s");
type = "ramdisk";
arch = "sandbox";
os = "linux";
%(ramdisk_load)s
compression = "none";
};
ramdisk@2 {
description = "snow";
data = /incbin/("%(loadables2)s");
type = "ramdisk";
arch = "sandbox";
os = "linux";
%(loadables2_load)s
compression = "none";
};
};
configurations {
default = "conf@1";
conf@1 {
kernel = "kernel@1";
fdt = "fdt@1";
%(ramdisk_config)s
%(loadables_config)s
};
};
};
'''
# Define a base FDT - currently we don't use anything in this
base_fdt = '''
/dts-v1/;
/ {
model = "Sandbox Verified Boot Test";
compatible = "sandbox";
reset@0 {
compatible = "sandbox,reset";
};
};
'''
# This is the U-Boot script that is run for each test. First load the FIT,
# then run the 'bootm' command, then save out memory from the places where
# we expect 'bootm' to write things. Then quit.
base_script = '''
sb load hostfs 0 %(fit_addr)x %(fit)s
fdt addr %(fit_addr)x
bootm start %(fit_addr)x
bootm loados
sb save hostfs 0 %(kernel_addr)x %(kernel_out)s %(kernel_size)x
sb save hostfs 0 %(fdt_addr)x %(fdt_out)s %(fdt_size)x
sb save hostfs 0 %(ramdisk_addr)x %(ramdisk_out)s %(ramdisk_size)x
sb save hostfs 0 %(loadables1_addr)x %(loadables1_out)s %(loadables1_size)x
sb save hostfs 0 %(loadables2_addr)x %(loadables2_out)s %(loadables2_size)x
'''
@pytest.mark.boardspec('sandbox')
@pytest.mark.buildconfigspec('fit_signature')
def test_fit(u_boot_console):
def make_fname(leaf):
"""Make a temporary filename
Args:
leaf: Leaf name of file to create (within temporary directory)
Return:
Temporary filename
"""
return os.path.join(cons.config.build_dir, leaf)
def filesize(fname):
"""Get the size of a file
Args:
fname: Filename to check
Return:
Size of file in bytes
"""
return os.stat(fname).st_size
def read_file(fname):
"""Read the contents of a file
Args:
fname: Filename to read
Returns:
Contents of file as a string
"""
with open(fname, 'r') as fd:
return fd.read()
def make_dtb():
"""Make a sample .dts file and compile it to a .dtb
Returns:
Filename of .dtb file created
"""
src = make_fname('u-boot.dts')
dtb = make_fname('u-boot.dtb')
with open(src, 'w') as fd:
print >> fd, base_fdt
util.run_and_log(cons, ['dtc', src, '-O', 'dtb', '-o', dtb])
return dtb
def make_its(params):
"""Make a sample .its file with parameters embedded
Args:
params: Dictionary containing parameters to embed in the %() strings
Returns:
Filename of .its file created
"""
its = make_fname('test.its')
with open(its, 'w') as fd:
print >> fd, base_its % params
return its
def make_fit(mkimage, params):
"""Make a sample .fit file ready for loading
This creates a .its script with the selected parameters and uses mkimage to
turn this into a .fit image.
Args:
mkimage: Filename of 'mkimage' utility
params: Dictionary containing parameters to embed in the %() strings
Return:
Filename of .fit file created
"""
fit = make_fname('test.fit')
its = make_its(params)
util.run_and_log(cons, [mkimage, '-f', its, fit])
with open(make_fname('u-boot.dts'), 'w') as fd:
print >> fd, base_fdt
return fit
def make_kernel(filename, text):
"""Make a sample kernel with test data
Args:
filename: the name of the file you want to create
Returns:
Full path and filename of the kernel it created
"""
fname = make_fname(filename)
data = ''
for i in range(100):
data += 'this %s %d is unlikely to boot\n' % (text, i)
with open(fname, 'w') as fd:
print >> fd, data
return fname
def make_ramdisk(filename, text):
"""Make a sample ramdisk with test data
Returns:
Filename of ramdisk created
"""
fname = make_fname(filename)
data = ''
for i in range(100):
data += '%s %d was seldom used in the middle ages\n' % (text, i)
with open(fname, 'w') as fd:
print >> fd, data
return fname
def find_matching(text, match):
"""Find a match in a line of text, and return the unmatched line portion
This is used to extract a part of a line from some text. The match string
is used to locate the line - we use the first line that contains that
match text.
Once we find a match, we discard the match string itself from the line,
and return what remains.
TODO: If this function becomes more generally useful, we could change it
to use regex and return groups.
Args:
text: Text to check (list of strings, one for each command issued)
match: String to search for
Return:
String containing unmatched portion of line
Exceptions:
ValueError: If match is not found
>>> find_matching(['first line:10', 'second_line:20'], 'first line:')
'10'
>>> find_matching(['first line:10', 'second_line:20'], 'second line')
Traceback (most recent call last):
...
ValueError: Test aborted
>>> find_matching('first line:10\', 'second_line:20'], 'second_line:')
'20'
>>> find_matching('first line:10\', 'second_line:20\nthird_line:30'],
'third_line:')
'30'
"""
__tracebackhide__ = True
for line in '\n'.join(text).splitlines():
pos = line.find(match)
if pos != -1:
return line[:pos] + line[pos + len(match):]
pytest.fail("Expected '%s' but not found in output")
def check_equal(expected_fname, actual_fname, failure_msg):
"""Check that a file matches its expected contents
Args:
expected_fname: Filename containing expected contents
actual_fname: Filename containing actual contents
failure_msg: Message to print on failure
"""
expected_data = read_file(expected_fname)
actual_data = read_file(actual_fname)
assert expected_data == actual_data, failure_msg
def check_not_equal(expected_fname, actual_fname, failure_msg):
"""Check that a file does not match its expected contents
Args:
expected_fname: Filename containing expected contents
actual_fname: Filename containing actual contents
failure_msg: Message to print on failure
"""
expected_data = read_file(expected_fname)
actual_data = read_file(actual_fname)
assert expected_data != actual_data, failure_msg
def run_fit_test(mkimage):
"""Basic sanity check of FIT loading in U-Boot
TODO: Almost everything:
- hash algorithms - invalid hash/contents should be detected
- signature algorithms - invalid sig/contents should be detected
- compression
- checking that errors are detected like:
- image overwriting
- missing images
- invalid configurations
- incorrect os/arch/type fields
- empty data
- images too large/small
- invalid FDT (e.g. putting a random binary in instead)
- default configuration selection
- bootm command line parameters should have desired effect
- run code coverage to make sure we are testing all the code
"""
# Set up invariant files
control_dtb = make_dtb()
kernel = make_kernel('test-kernel.bin', 'kernel')
ramdisk = make_ramdisk('test-ramdisk.bin', 'ramdisk')
loadables1 = make_kernel('test-loadables1.bin', 'lenrek')
loadables2 = make_ramdisk('test-loadables2.bin', 'ksidmar')
kernel_out = make_fname('kernel-out.bin')
fdt_out = make_fname('fdt-out.dtb')
ramdisk_out = make_fname('ramdisk-out.bin')
loadables1_out = make_fname('loadables1-out.bin')
loadables2_out = make_fname('loadables2-out.bin')
# Set up basic parameters with default values
params = {
'fit_addr' : 0x1000,
'kernel' : kernel,
'kernel_out' : kernel_out,
'kernel_addr' : 0x40000,
'kernel_size' : filesize(kernel),
'fdt_out' : fdt_out,
'fdt_addr' : 0x80000,
'fdt_size' : filesize(control_dtb),
'fdt_load' : '',
'ramdisk' : ramdisk,
'ramdisk_out' : ramdisk_out,
'ramdisk_addr' : 0xc0000,
'ramdisk_size' : filesize(ramdisk),
'ramdisk_load' : '',
'ramdisk_config' : '',
'loadables1' : loadables1,
'loadables1_out' : loadables1_out,
'loadables1_addr' : 0x100000,
'loadables1_size' : filesize(loadables1),
'loadables1_load' : '',
'loadables2' : loadables2,
'loadables2_out' : loadables2_out,
'loadables2_addr' : 0x140000,
'loadables2_size' : filesize(loadables2),
'loadables2_load' : '',
'loadables_config' : '',
}
# Make a basic FIT and a script to load it
fit = make_fit(mkimage, params)
params['fit'] = fit
cmd = base_script % params
# First check that we can load a kernel
# We could perhaps reduce duplication with some loss of readability
cons.config.dtb = control_dtb
cons.restart_uboot()
with cons.log.section('Kernel load'):
output = cons.run_command_list(cmd.splitlines())
check_equal(kernel, kernel_out, 'Kernel not loaded')
check_not_equal(control_dtb, fdt_out,
'FDT loaded but should be ignored')
check_not_equal(ramdisk, ramdisk_out,
'Ramdisk loaded but should not be')
# Find out the offset in the FIT where U-Boot has found the FDT
line = find_matching(output, 'Booting using the fdt blob at ')
fit_offset = int(line, 16) - params['fit_addr']
fdt_magic = struct.pack('>L', 0xd00dfeed)
data = read_file(fit)
# Now find where it actually is in the FIT (skip the first word)
real_fit_offset = data.find(fdt_magic, 4)
assert fit_offset == real_fit_offset, (
'U-Boot loaded FDT from offset %#x, FDT is actually at %#x' %
(fit_offset, real_fit_offset))
# Now a kernel and an FDT
with cons.log.section('Kernel + FDT load'):
params['fdt_load'] = 'load = <%#x>;' % params['fdt_addr']
fit = make_fit(mkimage, params)
cons.restart_uboot()
output = cons.run_command_list(cmd.splitlines())
check_equal(kernel, kernel_out, 'Kernel not loaded')
check_equal(control_dtb, fdt_out, 'FDT not loaded')
check_not_equal(ramdisk, ramdisk_out,
'Ramdisk loaded but should not be')
# Try a ramdisk
with cons.log.section('Kernel + FDT + Ramdisk load'):
params['ramdisk_config'] = 'ramdisk = "ramdisk@1";'
params['ramdisk_load'] = 'load = <%#x>;' % params['ramdisk_addr']
fit = make_fit(mkimage, params)
cons.restart_uboot()
output = cons.run_command_list(cmd.splitlines())
check_equal(ramdisk, ramdisk_out, 'Ramdisk not loaded')
# Configuration with some Loadables
with cons.log.section('Kernel + FDT + Ramdisk load + Loadables'):
params['loadables_config'] = 'loadables = "kernel@2", "ramdisk@2";'
params['loadables1_load'] = ('load = <%#x>;' %
params['loadables1_addr'])
params['loadables2_load'] = ('load = <%#x>;' %
params['loadables2_addr'])
fit = make_fit(mkimage, params)
cons.restart_uboot()
output = cons.run_command_list(cmd.splitlines())
check_equal(loadables1, loadables1_out,
'Loadables1 (kernel) not loaded')
check_equal(loadables2, loadables2_out,
'Loadables2 (ramdisk) not loaded')
cons = u_boot_console
try:
# We need to use our own device tree file. Remember to restore it
# afterwards.
old_dtb = cons.config.dtb
mkimage = cons.config.build_dir + '/tools/mkimage'
run_fit_test(mkimage)
finally:
# Go back to the original U-Boot with the correct dtb.
cons.config.dtb = old_dtb
cons.restart_uboot()
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