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|
bisect.py is a wrapper around the general purpose binary_search_state.py. It
provides a user friendly interface for bisecting various compilation errors.
The 2 currently provided methods of bisecting are ChromeOS package and object
bisection. Each method defines a default set of options to pass to
binary_search_state.py and allow the user to override these defaults (see
the "Overriding" section).
** NOTE **
All commands, examples, scripts, etc. are to be run from your chroot unless
stated otherwise.
Bisection Methods:
1) ChromeOS Package:
This method will bisect across all packages in a ChromeOS repository and find
the offending packages (according to your test script). This method takes the
following arguments:
board: The board to bisect on. For example: daisy, falco, etc.
remote: The IP address of the physical machine you're using to test with.
By default the ChromeOS package method will do a simple interactive test that
pings the machine and prompts the user if the machine is good.
a) Setup:
The ChromeOS package method requires that you have three build trees:
/build/${board}.bad - The build tree for your "bad" build
/build/${board}.good - The build tree for your "good" build
/build/${board}.work - A full copy of /build/${board}.bad
b) Cleanup:
bisect.py does most cleanup for you, the only thing required by the user is
to cleanup all built images and the three build trees made in /build/
c) Default Arguments:
--get_initial_items='cros_pkg/get_initial_items.sh'
--switch_to_good='cros_pkg/switch_to_good.sh'
--switch_to_bad='cros_pkg/switch_to_bad.sh'
--test_setup_script='cros_pkg/test_setup.sh'
--test_script='cros_pkg/interactive_test.sh'
--incremental
--prune
--file_args
d) Additional Documentation:
See ./cros_pkg/README.cros_pkg_triage for full documentation of ChromeOS
package bisection.
e) Examples:
i) Basic interactive test package bisection, on daisy board:
./bisect.py package daisy 172.17.211.184
ii) Basic boot test package bisection, on daisy board:
./bisect.py package daisy 172.17.211.184 -t cros_pkg/boot_test.sh
2) ChromeOS Object:
This method will bisect across all objects in a ChromeOS package and find
the offending objects (according to your test script). This method takes the
following arguments:
board: The board to bisect on. For example: daisy, falco, etc.
remote: The IP address of the physical machine you're using to test with.
package: The package to bisect with. For example: chromeos-chrome
dir: (Optional) the directory for your good/bad build trees. Defaults to
$BISECT_DIR or /tmp/sysroot_bisect. This value will set $BISECT_DIR
for all bisecting scripts.
By default the ChromeOS object method will do a simple interactive test that
pings the machine and prompts the user if the machine is good.
a) Setup:
The ChromeOS package method requires that you populate your good and bad set
of objects. sysroot_wrapper will automatically detect the BISECT_STAGE
variable and use this to populate emerged objects. Here is an example:
# Defaults to /tmp/sysroot_bisect
export BISECT_DIR="/path/to/where/you/want/to/store/builds/"
export BISECT_STAGE="POPULATE_GOOD"
./switch_to_good_compiler.sh
emerge-${board} -C ${package_to_bisect}
emerge-${board} ${package_to_bisect}
export BISECT_STAGE="POPULATE_BAD"
./switch_to_bad_compiler.sh
emerge-${board} -C {package_to_bisect}
emerge-${board} ${package_to_bisect}
b) Cleanup:
The user must clean up all built images and the populated object files.
c) Default Arguments:
--get_initial_items='sysroot_wrapper/get_initial_items.sh'
--switch_to_good='sysroot_wrapper/switch_to_good.sh'
--switch_to_bad='sysroot_wrapper/switch_to_bad.sh'
--test_setup_script='sysroot_wrapper/test_setup.sh'
--test_script='sysroot_wrapper/interactive_test.sh'
--noincremental
--prune
--file_args
d) Additional Documentation:
See ./sysroot_wrapper/README for full documentation of ChromeOS object file
bisecting.
e) Examples:
i) Basic interactive test object bisection, on daisy board for
cryptohome package:
./bisect.py object daisy 172.17.211.184 cryptohome
ii) Basic boot test package bisection, on daisy board for cryptohome
package:
./bisect.py object daisy 172.17.211.184 cryptohome \
--test_script=sysroot_wrapper/boot_test.sh
3) Android object:
NOTE: Because this isn't a ChromeOS bisection tool, the concept of a
chroot doesn't exist. Just run this tool from a normal shell.
This method will bisect across all objects in the Android source tree and
find the offending objects (according to your test script). This method takes
the following arguments:
android_src: The location of your android source tree
num_jobs: (Optional) The number of jobs to pass to make. This is dependent
on how many cores your machine has. A good number is probably
somewhere around 5 to 10.
device_id: (Optional) The serial code for the device you are testing on.
This is used to determine which device should be used in case
multiple devices are plugged into your computer. You can get
serial code for your device by running "adb devices".
dir: (Optional) the directory for your good/bad build trees. Defaults to
$BISECT_DIR or ~/ANDROID_BISECT/. This value will set $BISECT_DIR
for all bisecting scripts.
By default the Android object method will do a simple interactive test that
pings the machine and prompts the user if the machine is good.
a) Setup:
The Android object method requires that you populate your good and bad set
of objects. The Android compiler wrapper will automatically detect the
BISECT_STAGE variable and use this to populate emerged objects. Here is an
example:
# Defaults to ~/ANDROID_BISECT/
export BISECT_DIR="/path/to/where/you/want/to/store/builds/"
export BISECT_STAGE="POPULATE_GOOD"
# Install the "good" compiler
./switch_to_good_compiler.sh
make clean
make -j <your_preferred_number_of_jobs>
export BISECT_STAGE="POPULATE_BAD"
# Install the "bad" compiler
./switch_to_bad_compiler.sh
make clean
make -j <your_preferred_number_of_jobs>
b) Cleanup:
The user must clean up all built images and the populated object files.
c) Default Arguments:
--get_initial_items='android/get_initial_items.sh'
--switch_to_good='android/switch_to_good.sh'
--switch_to_bad='android/switch_to_bad.sh'
--test_setup_script='android/test_setup.sh'
--test_script='android/interactive_test.sh'
--incremental
--prune
--file_args
d) Additional Documentation:
See ./android/README.android for full documentation of Android object file
bisecting.
e) Examples:
i) Basic interactive test android bisection, where the android source is
at ~/android_src:
./bisect.py android ~/android_src
ii) Basic boot test android bisection, where the android source is at
~/android_src, and 10 jobs will be used to build android:
./bisect.py android ~/android_src --num_jobs=10 \
--test_script=sysroot_wrapper/boot_test.sh
Resuming:
bisect.py and binary_search_state.py offer the ability to resume a bisection
in case it was interrupted by a SIGINT, power failure, etc. Every time the
tool completes a bisection iteration its state is saved to disk (usually to
the file "./bisect.py.state"). If passed the --resume option, the tool
it will automatically detect the state file and resume from the last
completed iteration.
Overriding:
You can run ./bisect.py --help or ./binary_search_state.py --help for a full
list of arguments that can be overriden. Here are a couple of examples:
Example 1 (do boot test instead of interactive test):
./bisect.py package daisy 172.17.211.182 --test_script=cros_pkg/boot_test.sh
Example 2 (do package bisector system test instead of interactive test, this
is used to test the bisecting tool itself -- see comments in
hash_test.sh for more details):
./bisect.py package daisy 172.17.211.182 \
--test_script=common/hash_test.sh --test_setup_script=""
Example 3 (enable verbose mode, disable pruning, and disable verification):
./bisect.py package daisy 172.17.211.182 \
--verbose --prune=False --verify=False
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