Re: [dpdk-dev] [PATCH v3 2/4] devtools: add generation of compressed abi dump archives

[Aaron Conole <aconole@redhat.com>]

"Burakov, Anatoly" <anatoly.burakov@intel.com> writes:

> On 11-Sep-20 5:03 PM, Conor Walsh wrote:
>> This patch adds a script that generates a compressed archive
>> containing .dump files which can be used to perform ABI
>> breakage checking for the build specified in the parameters.
>> Invoke using "./gen-abi-tarball.py -t <tag> -a <arch> [-cf <cross-file>]"
>>   - <tag>: dpdk tag e.g. "v20.11"
>>   - <arch>: required architecture e.g. "arm" or "x86_64"
>>   - <cross-file>: configuration file for cross compiling for another
>>                   system, this flag is not required.
>>                   e.g. "config/arm/arm64_armv8_linux_gcc"
>> E.g. "./gen-abi-tarball.py -t latest -a x86_64"
>> If a compiler is not specified using the CC environmental variable then
>> the script will default to using gcc.
>> Using these parameters the script will produce a .tar.gz archive
>> containing .dump files required to do ABI breakage checking
>>
>> Signed-off-by: Conor Walsh <conor.walsh@intel.com>
>> ---
>
> Just a general comment: this script looks like it's bash translated to
> python. If you're going to do that, you might as well just write it in
> bash?
>
>>   devtools/gen-abi-tarball.py | 125 ++++++++++++++++++++++++++++++++++++
>>   1 file changed, 125 insertions(+)
>>   create mode 100755 devtools/gen-abi-tarball.py
>>
>> diff --git a/devtools/gen-abi-tarball.py b/devtools/gen-abi-tarball.py
>> new file mode 100755
>> index 000000000..06761fca6
>> --- /dev/null
>> +++ b/devtools/gen-abi-tarball.py
>> @@ -0,0 +1,125 @@
>> +#!/usr/bin/env python3
>> +# SPDX-License-Identifier: BSD-3-Clause
>> +# Copyright(c) 2020 Intel Corporation
>> +
>> +import sys
>> +import os
>> +import argparse
>> +
>
> It is preferred to wrap executable code in "if __name__ ==
> "__main__"..., helps with importing code while avoiding executing it
> on import.

I wonder, since DPDK is supporting windows, we should prefer python to
bash?  I do prefer to use bash because I don't use windows, but maybe
that is a good reason?

>> +# Get command line arguments
>> +parser = argparse.ArgumentParser(usage='\rThis script is intended to generate ABI dump tarballs\n'+
>> +                                       'Supported environmental variables\n'+
>> + '\t- CC: The required compiler will be determined using this
>> environmental variable.\n')
>> +parser.add_argument('-t', '--tag', type=str, dest='tag', help='DPDK tag e.g. latest or v20.11')
>> +parser.add_argument('-cf', '--cross-file', type=str,
>> dest='crosscompile', help='Set the location of a cross compile
>> config')
>> +parser.add_argument('-a', '--arch', type=str, dest='arch', help='Arch arm or x86_64')
>> +args = parser.parse_args()
>> +
>> +# Get the DPDK tag if not supplied set as latest
>> +if args.tag:
>> +    user_tag = args.tag
>> +else:
>> +    user_tag = 'latest'
>> +    print('No tag supplied defaulting to latest')
>
> There's a "default" option for arguments.
>
>> +
>> +# Get the cross-compile option
>> +if args.crosscompile:
>> +    cross_comp = args.crosscompile
>> +    if not args.arch:
>> +        sys.stderr.write('ERROR Arch must be set using -a when using cross compile\n')
>> +        exit(1)
>> +    cross_comp = os.path.abspath(cross_comp)
>> +    cross_comp_meson = '--cross-file '+cross_comp
>> +else:
>> +    cross_comp = ''
>> +    cross_comp_meson = ''
>> +
>> +# Get the required system architecture if not supplied set as x86_64
>> +if args.arch:
>> +    arch = args.arch
>> +else:
>> +    arch = os.popen('uname -m').read().strip()
>
> There's a built-in python library for this, i think it's called "platform".
>
>> +    print('No system architecture supplied defaulting to '+arch)
>> +
>> +tag = ''
>> +# If the user did not supply tag or wants latest then get latest tag
>> +if user_tag == 'latest':
>> +    # Get latest quarterly build tag from git repo
>> + tag = os.popen('git ls-remote --tags http://dpdk.org/git/dpdk |
>> grep -v "rc\|{}" | tail -n 1 | sed "s/.*\///"').read().strip()
>> +else:
>> +    tag = user_tag
>> +    # If the user supplied tag is not in the DPDK repo then fail
>> + tag_check = int(os.popen('git ls-remote http://dpdk.org/git/dpdk
>> refs/tags/'+tag+' | wc -l').read().strip())
>> +    if tag_check != 1:
>> +        sys.stderr.write('ERROR supplied tag does not exist in DPDK repo\n')
>> +        exit(1)
>> +
>> +# Get the specified compiler from system
>> +comp_env = 'CC'
>> +if comp_env in os.environ:
>> +    comp = os.environ[comp_env]
>> +    comp_default = ''
>> +else:
>> +    print('No compiler specified, defaulting to gcc')
>> +    comp = 'gcc'
>> +    comp_default = 'CC=gcc'
>> +
>> +# Print the configuration to the user
>> +print('\nSelected Build: '+tag+', Compiler: '+comp+', Architecture:
>> '+arch+', Cross Compile: '+cross_comp)
>
> Here and in similar places: please don't use string concatenation, use
> string formatting instead.
>
>> +
>> +# Store the base directory script is working from
>> +baseDir = os.getcwd()
>> +# Store devtools dir
>> +devtoolsDir = os.path.abspath(os.path.dirname(os.path.realpath(sys.argv[0])))
>> +
>> +# Create directory for DPDK git repo and build
>> +try:
>> +    os.mkdir('dump_dpdk')
>> +except OSError as error:
>> + sys.stderr.write('ERROR The dump_dpdk directory could not be
>> created, ensure it does not exist before start\n')
>> +    exit(1)
>> +os.chdir('dump_dpdk')
>> +# Clone DPDK and switch to specified tag
>> +print('Cloning '+tag+' from DPDK git')
>> +os.popen('git clone --quiet http://dpdk.org/git/dpdk >/dev/null').read()
>> +os.chdir('dpdk')
>> +os.popen('git checkout --quiet '+tag+' >/dev/null').read()
>> +
>> +# Create build folder with meson and set debug build and cross compile (if needed)
>> +print('Configuring Meson')
>> +os.popen(comp_default+' meson dumpbuild '+cross_comp_meson+' >/dev/null').read()
>
> You do this os.popen(something > /dev/bull).read() quite a lot, maybe
> put it into a function? Also, since you're discarding the data anyway
> - 
> why os.popen().read() instead of os.system()?
>
>> +os.chdir('dumpbuild')
>> +os.popen('meson configure -Dbuildtype=debug >/dev/null').read()
>> +print('Building DPDK . . .')
>> +#Build DPDK with ninja
>> +os.popen('ninja >/dev/null').read()
>> +gccDir = os.getcwd()
>> +
>> +# Create directory for abi dump files
>> +dumpDir = os.path.join(baseDir,tag+'-'+comp+'-'+arch+'-abi_dump')
>> +try:
>> +    os.mkdir(dumpDir)
>> +except OSError as error:
>> +    sys.stderr.write('ERROR The '+dumpDir+' directory could not be created\n')
>> +    os.popen('rm -rf '+os.path.join(baseDir,'dump_dpdk')).read()
>> +    exit(1)
>> +
>> +# Create dump files and output to dump directory
>> +print('Generating ABI dump files')
>> +genabiout = os.popen(os.path.join(devtoolsDir,'gen-abi.sh')+' '+gccDir).read()
>> +os.popen('cp dump/* '+dumpDir).read()
>> +
>> +# Compress the dump directory
>> +print('Creating Tarball of dump files')
>> +os.chdir(baseDir)
>> +origSize = os.popen('du -sh '+dumpDir+' | sed "s/\s.*$//"').read()
>> +os.popen('tar -czf '+dumpDir.split('/')[-1]+'.tar.gz '+dumpDir.split('/')[-1]+' >/dev/null').read()
>> +newSize = os.popen('du -sh '+dumpDir+'.tar.gz | sed "s/\s.*$//"').read()
>> +
>> +# Remove all temporary directories
>> +print('Cleaning up temporary directories')
>> +os.popen('rm -rf '+dumpDir).read()
>> +os.popen('rm -rf '+os.path.join(baseDir,'dump_dpdk')).read()
>> +
>> +#Print output of the script to the user
>> +print('\nDump of DPDK ABI '+tag+' is available in
>> '+dumpDir.split('/')[-1]+'.tar.gz (Original Size:
>> '+origSize.strip()+', Compressed Size:'+newSize.strip()+')\n')
>>