2020.05.11-Python中调用zip包中的Python脚本
文章目录
- Abstract
- define the class body of class DeviceSpecificParams
- to create a object of class DeviceSpecificParams
Abstract
In the firstly,generalize/epitomize/summarize the content of the call a pyhton script in zip packzge.In the second,analyzing the principle of related function.such as :
WriteFullOTAPackage()
WriteIncrementalOTAPackage()
define the class body of class DeviceSpecificParams
class DeviceSpecificParams(object):
1150 module = None
1151 def __init__(self, **kwargs):
1152 """Keyword arguments to the constructor become attributes of this
1153 object, which is passed to all functions in the device-specific
1154 module."""
1155 for k, v in kwargs.iteritems():
1156 setattr(self, k, v)
1157 self.extras = OPTIONS.extras
1158
1159 if self.module is None:
1160 path = OPTIONS.device_specific
1161 if not path:
1162 return
1163 try:
1164 if os.path.isdir(path):
1165 info = imp.find_module("releasetools", [path])
1166 else:
1167 d, f = os.path.split(path)
1168 b, x = os.path.splitext(f)
1169 if x == ".py":
1170 f = b
1171 info = imp.find_module(f, [d])
1172 print("loaded device-specific extensions from", path)
1173 self.module = imp.load_module("device_specific", *info)
1174 except ImportError:
1175 print("unable to load device-specific module; assuming none")
to create a object of class DeviceSpecificParams
399 device_specific = common.DeviceSpecificParams(
400 input_zip=input_zip,
401 input_version=OPTIONS.info_dict["recovery_api_version"],
402 output_zip=output_zip,
403 script=script,
404 input_tmp=OPTIONS.input_tmp,
405 metadata=metadata,
406 info_dict=OPTIONS.info_dict)
407
408 #assert HasRecoveryPatch(input_zip)
The code "imp.find_module(“releasetools”, [path])"is original to the module named imp,aimed to find a module or class. Then a operation of load a module processed in the code “self.module = imp.load_module(“device_specific”, *info)”.
The perform of function through the method that class DeviceSpecificParams object read input target OTA package and load releasetools.py,then load the function to process specific function by the function _DoCall.
1177 def _DoCall(self, function_name, *args, **kwargs):
1178 """Call the named function in the device-specific module, passing
1179 the given args and kwargs. The first argument to the call will be
1180 the DeviceSpecific object itself. If there is no module, or the
1181 module does not define the function, return the value of the
1182 'default' kwarg (which itself defaults to None)."""
1183 if self.module is None or not hasattr(self.module, function_name):
1184 return kwargs.get("default", None)
1185 return getattr(self.module, function_name)(*((self,) + args), **kwargs)
函数调用：
1193 def FullOTA_InstallBegin(self):
1194 """Called at the start of full OTA installation."""
1195 return self._DoCall("FullOTA_InstallBegin")
hasattr(self.module, function_name) to estimate/judge the class DeviceSpecificParams object
setattr(object, name, value) 函数对应函数 getattr()，用于设置属性值，该属性不一定是存在的。
getattr(object, name[, default]) 函数用于返回一个对象属性值。
传进来self，也即class DeviceSpecificParams’s instance。
def FullOTA_InstallBegin(info):
714 print "FullOTA_InstallBegin"
715 script = info.script;
716 script_ext = EdifyGeneratorExt(script);
717 output_zip = info.output_zip
718 input_zip = info.input_zip
719 PartitionUpdater.SetupEnv(script, script_ext, OPTIONS)
720 radio_dir = os.path.join(OPTIONS.input_tmp, "RADIO")
721 script_ext.AddNvmergeToZipExt(input_zip, output_zip)
722
723 if OPTIONS.modem_update:
724 script_ext.UnpackPackageFile("META-INF/com/google/android/nvmerge", os.path.join(OPTIONS.tmp_path, "nvmerge"))
725 script_ext.UnpackPackageFile("META-INF/com/google/android/nvmerge.cfg", os.path.join(OPTIONS.tmp_path, "nvmerge.cfg"))
726
727 partitions = []
728 configs = GetAllUpdaterConfigs(input_zip)
729
730 if OPTIONS.partition_change:
731 script_ext.AddRepartsToZipExt(input_zip, output_zip)
732 script_ext.AddE2fsToZipExt(input_zip, output_zip)
733 ParseXml(input_zip, OPTIONS.target_partition_list)
734 for config in configs:
735 if ((OPTIONS.uboot_update and config.update_type == "B") or (OPTIONS.modem_update and config.update_type == "M") ):
736 partition = PartitionFullUpdater(config.mount_point, config.file_name, radio_dir,
737 verbatim=config.verbatim,
738 mount_point2=config.mount_point2,
739 mount_point3=config.mount_point3,
740 nv_merge=config.nv_merge,
741 spl_merge=config.spl_merge)
742 partition.AddToOutputZip(output_zip)
743 if partition.nv_merge and partition.input.bin:
744 print"partition.mount_point2=%s"%partition.mount_point2
745 print"GetPartitionDev( partition.mount_point2)=%s"%(GetPartitionDev( partition.mount_point2))
746 OPTIONS.backup_list.append( GetPartitionDev( partition.mount_point2))
747 OPTIONS.backup_list.append( GetPartitionDev( partition.mount_point3))
748 partitions.append(partition)
749
750 if OPTIONS.partition_change:
751 AdjustPartition(info, input_zip, output_zip)
752
753 for partition in partitions:
754 partition.Update()
755
756 if OPTIONS.wipe_product_info:
757 partion_productinfo = PartitionUpdater("/productinfo")
758 partion_productinfo.FormatPartition("format productinfo ....")
759
760 #if OPTIONS.modem_update:
761 #script.DeleteFiles([os.path.join(OPTIONS.tmp_path, "nvmerge"), os.path.join(OPTIONS.tmp_path, "nvmerge.cfg")])
762 #script.DeleteFiles([os.path.join(OPTIONS.tmp_path, "repart"), os.path.join(OPTIONS.sdcard_path, "partition.cfg")])
打印结果
Help on built-in function find_module in module imp:
find_module(...)
find_module(name, [path]) -> (file, filename, (suffix, mode, type))
Search for a module. If path is omitted or None, search for a
built-in, frozen or special module and continue search in sys.path.
The module name cannot contain '.'; to search for a submodule of a
package, pass the submodule name and the package's __path__.
[Ethan] help:None
loaded device-specific extensions from /tmp/targetfiles-G8MEMA/META/releasetools.py
[Ethan] *args=(), **kwargs={}
FullOTA_Assertions
using prebuilt recovery.img from IMAGES...
[Ethan] *args=(), **kwargs={}
FullOTA_InstallBegin
info is <common.DeviceSpecificParams object at 0x7f8c9ec5b750>