Python getopt use

getopt

Function Prototypes:

getopt.getopt(args, shortopts, longopts=[])

Parameter explanation:

• Args:args is a list of parameters that need to be parsed. General use Sys.argv[1:], this can filter out the first parameter (PS: The first parameter is the name of the script, it should not be parsed as a parameter)
• Shortopts: Shorthand parameter list
• Longopts: Long parameter list

return value:

• OPTs: The parsed (option, value) list pair.
• Args: The list of remaining command-line arguments that are not part of the format information.

Source Analysis

In the build system of the Android generation Ota, the Parseoptions function in the common.py file is used to parse the input parameters, so we can analyze the use of getopt by the implementation of the function.

The function source code is as follows:

 def parseoptions(argv, docstring, extra_opts="", extra_long_opts=(), Extra_option_handler=none):    Try: opts, args = Getopt.getopt (argv,"Hvp:s:x"+ Extra_opts, ["Help","Verbose","Path=","Signapk_path=","extra_signapk_args=","Java_path=","public_key_suffix=","private_key_suffix=","device_specific=","Extra="] + list (extra_long_opts))exceptGetopt. Getopterror, Err:usage (docstring)Print "**", str (ERR),"**"Sys.exit (2) path_specified =False     forO, ainchOPTsifOinch("-H","--help"): Usage (docstring) sys.exit ()elifOinch("-V","--verbose"): Options.verbose =True        elifOinch("-P","--path"): Options.search_path = aelifOinch("--signapk_path",): Options.signapk_path = aelifOinch("--extra_singapk_args",): Options.extra_signapk_args = Shlex.split (a)elifOinch("--java_path",): Options.java_path = aElse:ifExtra_option_handler is None or  notExtra_option_handler (O, a):assert False,"unknown option \"%s\ ""% (o,) os.environ["PATH"] = (Os.path.join (Options.search_path,"Bin") + Os.pathsep + os.environ["PATH"])returnArgs

Where extra_option_handler can be understood as a function pointer, its function is also to parse OPTs's key-value pairs.
Extra_option_handler source code is as follows:

   def option_handler(O, a):    ifOinch("-B","--board_config"):Pass   # deprecated    elifOinch("-K","--package_key"): Options.package_key = aelifOinch("-I.","--incremental_from"): Options.incremental_source = aelifOinch("-W","--wipe_user_data"): Options.wipe_user_data =True    elifOinch("-N","--no_prereq"): Options.omit_prereq =True    elifOinch("-E","--extra_script"): Options.extra_script = aelifOinch(" -a","--aslr_mode"):ifAinch("on","on","true","True","Yes","Yes"): Options.aslr_mode =True      Else: Options.aslr_mode =False    elifOinch("--worker_threads"): options.worker_threads = Int (a)Else:return False    return True

The parameters for the general generation of oat full-scale packages are argv as follows:

argv = [‘-v‘‘-p‘‘out/host/linux-xxx‘‘-k‘‘build/target/product/security/testkey‘‘out/target/product/xxx/obj/PACKAGING/target_files_intermediates/xxx-target_files.zip‘‘out/target/product/xxx/xxx_20150723.1340-ota.zip‘]

First, the parameters are analyzed, and the short parameters include:

-v,-p,-k,

After parsing, the resulting results are as follows:

opts = [(‘-v‘‘‘), (‘-p‘‘out/host/linux-x86‘), (‘-k‘‘build/target/product/security/testkey‘)]args =[‘out/target/product/xxx/obj/PACKAGING/target_files_intermediates/xxx-target_files.zip‘‘out/target/product/xxx/xxx_20150723.1340-ota.zip‘]

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Python getopt use