吉姆小窩

Saturday, June 17, 2017

How to apply a patch made by repo diff?

Source: https://groups.google.com/forum/#!topic/repo-discuss/43juvD1qGIQ

## Script to patch up diff reated by `repo diff`

if [ -z "$1" ] || [ ! -e "$1" ]; then
    echo "Usages: $0 <repo_diff_file>";
    exit 0;
fi

rm -fr _tmp_splits*
cat $1 | csplit -qf '' -b "_tmp_splits.%d.diff" - '/^project.*\/$/' '{*}'

working_dir=`pwd`

for proj_diff in `ls _tmp_splits.*.diff`
do
    chg_dir=`cat $proj_diff | grep '^project.*\/$' | cut -d " " -f 2`
    echo "FILE: $proj_diff $chg_dir"
    if [ -e $chg_dir ]; then
        ( cd $chg_dir; \
            cat $working_dir/$proj_diff | grep -v '^project.*\/$' | patch -Np1;);
    else
        echo "$0: Project directory $chg_dir don't exists.";
    fi
done

Android 調試.so庫文件

資料來源: http://www.blogjava.net/anymobile/articles/314685.html

作者：徐建祥(netpirate@gmail.com)
日期：2010/03/06
網址：http://www.anymobile.org

調試步驟如下：
1/ 將異常的地址信息存到文本文件，並存放在項目根目錄；
2/ 使用panic.py解析該文件；
3/ 根據返回的信息(文件名;行號;方法名)調試程序。

以操作第三方的Touch input 輸入法為例，過程如下：

# 該輸入法的英文和手寫OK，操作中文輸入法時，出現異常，軟鍵盤消失，異常日誌如下
02-05 06:41:19.834 D/dalvikvm( 751): Trying to load lib /system/lib/libimezi.so 0x43e2a788
02-05 06:41:19.874 D/dalvikvm( 751): Added shared lib /system/lib/libimezi.so 0x43e2a788
02-05 06:41:20.035 I/DEBUG   ( 551): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
02-05 06:41:20.035 I/DEBUG   ( 551): Build fingerprint: 'unknown'
02-05 06:41:20.035 I/DEBUG   ( 551): pid: 751, tid: 751 >>> com.htc.android.cime <<<
02-05 06:41:20.045 I/DEBUG   ( 551): signal 11 (SIGSEGV), fault addr 00000003
02-05 06:41:20.045 I/DEBUG   ( 551): r0 00000000 r1 00000000 r2 807248ec r3 807248ec
02-05 06:41:20.055 I/DEBUG   ( 551): r4 00252d80 r5 00000004 r6 00000001 r7 00000000
02-05 06:41:20.055 I/DEBUG   ( 551): r8 beff8550 r9 41459d28 10 41459d18 fp 00000000
02-05 06:41:20.055 I/DEBUG   ( 551): ip 8072430c sp beff84f0 lr 80716b4f pc 80717bce cpsr 60000030
02-05 06:41:20.135 I/DEBUG   ( 551):          #00 pc 00017bce /system/lib/libimezi.so
02-05 06:41:20.135 I/DEBUG   ( 551):          #01 pc 00010f80 /system/lib/libimezi.so
02-05 06:41:20.145 I/DEBUG   ( 551): stack:
02-05 06:41:20.155 I/DEBUG   ( 551):     beff84b0 ad083e10
02-05 06:41:20.155 I/DEBUG   ( 551):     beff84b4 ad05d44f /system/lib/libdvm.so
02-05 06:41:20.155 I/DEBUG   ( 551):     beff84b8 ad06b8a0 /system/lib/libdvm.so
02-05 06:41:20.155 I/DEBUG   ( 551):     beff84bc ad083e10
02-05 06:41:20.167 I/DEBUG   ( 551):     beff84c0 43e2aa90
02-05 06:41:20.175 I/DEBUG   ( 551):     beff84c4 00000003
02-05 06:41:20.175 I/DEBUG   ( 551):     beff84c8 00000014
02-05 06:41:20.185 I/DEBUG   ( 551):     beff84cc 80716b4f /system/lib/libimezi.so

# 保存異常日誌，存為文件: 20100205_ime.txt
02-05 06:41:20.045 I/DEBUG   ( 551): r0 00000000 r1 00000000 r2 807248ec r3 807248ec
02-05 06:41:20.055 I/DEBUG   ( 551): r4 00252d80 r5 00000004 r6 00000001 r7 00000000
02-05 06:41:20.055 I/DEBUG   ( 551): r8 beff8550 r9 41459d28 10 41459d18 fp 00000000
02-05 06:41:20.055 I/DEBUG   ( 551): ip 8072430c sp beff84f0 lr 80716b4f pc 80717bce cpsr 60000030
02-05 06:41:20.135 I/DEBUG   ( 551):          #00 pc 00017bce /system/lib/libimezi.so
02-05 06:41:20.135 I/DEBUG   ( 551):          #01 pc 00010f80 /system/lib/libimezi.so

# 執行腳本
xujianxiang@wingdroid-clone:~/workspace/xujx/wing15$ ./panic.py 20100205_ime.txt
read file ok
/home/xujianxiang/workspace/xujx/wing15/prebuilt/linux-x86/toolchain/arm-eabi-4.2.1/bin/arm-eabi-addr2line: '/home/xujianxiang/workspace/xujx/wing15/out/target/product/generic/symbols/system/lib/libimezi.so': No such file
Traceback (most recent call last):
File "./panic.py", line 69, in <module>
    print "%-30s%s" % (list[1],list[0])
IndexError: list index out of range

# 沒找到庫文件，因為這個文件是第三方的，只存放在/out/target/product/generic/system/lib /libimezi.so，拷貝一份存到/out/target/product/generic/symbols/system/lib /libimezi.so，再次執行腳本
xujianxiang@wingdroid-clone:~/workspace/xujx/wing15$ ./panic.py 20100205_ime.txt
read file ok
zi81keyd.c:0                  Zi8GetTableData
zi81keyd.c:0                  Zi8InitializeDynamic

# 成功解析異常，沒有zi8庫文件所致，更新如下庫文件，輸入法支持中文拼音。
/system/lib/zi/Zi8DatPYP_CN.z8d
/system/lib/zi/Zi8DatPYS_CN.z8d
/system/lib/zi/Zi8DatZHA_CN.z8d
/system/lib/zi/Zi8DatZHA_HK.z8d
/system/lib/zi/Zi8DatZHA_TW.z8d
/system/lib/zi/Zi8DatZYP_TW.z8d
/system/lib/zi/Zi8DatZYS_TW.z8d

附 panic.py：

#!/usr/bin/python
# stack symbol parser

import os
import string
import sys

#define android product name
#ANDROID_PRODUCT_NAME = 'generic'
ANDROID_PRODUCT_NAME = 'smdk6410'

ANDROID_WORKSPACE = os.getcwd()+"/"

# addr2line tool path and symbol path
addr2line_tool = ANDROID_WORKSPACE + 'prebuilt/linux-x86/toolchain/arm-eabi-4.2.1/bin/arm-eabi-addr2line'
symbol_dir = ANDROID_WORKSPACE + 'out/target/product/' + ANDROID_PRODUCT_NAME +'/symbols'
symbol_bin = symbol_dir + '/system/bin/'
symbol_lib = symbol_dir + '/system/lib/'

class ReadLog:
    def __init__(self,filename):
        self.logname = filename
    def parse(self):
        f = file(self.logname,'r')
        lines = f.readlines()
        if lines != []:
            print 'read file ok'
        else:
            print 'read file failed'
        result =[]
        for line in lines:
            if line.find('stack') != -1:
                print 'stop search'
                break
            elif line.find('system') != -1:
                #print 'find one item' + line
                result.append(line)
        return result

class ParseContent:
    def __init__(self,addr,lib):
            self.address = addr # pc address
            self.exename = lib  # executable or shared library
    def addr2line(self):
        cmd = addr2line_tool + " -C -f -s -e " + symbol_dir + self.exename + " " + self.address
        #print cmd
        stream = os.popen(cmd)
        lines = stream.readlines();
        list = map(string.strip,lines)
        return list
    
inputarg = sys.argv
if len(inputarg) < 2:
    print 'Please input panic log'
    exit()

filename = inputarg[1]
readlog = ReadLog(filename)
inputlist = readlog.parse()

for item in inputlist:
    itemsplit = item.split()
    test = ParseContent(itemsplit[-2],itemsplit[-1])
    list = test.addr2line()
    print "%-30s%s" % (list[1],list[0])

Tuesday, February 07, 2017

[轉] 關於refs/for/

資料來源: http://lishicongli.blog.163.com/blog/static/146825902013213439500/

1. 這個不是git的規則，而是gerrit的規則，
2. Branches, remote-tracking branches, and tags等等都是對commite的引用（reference）,引用都以「refs/……」表示. 比如remote branch: origin/git_int(=refs/remotes/origin/git_int)， local tag: v2.0(=refs/tags/v2.0)， local branch: git_int(=refs/heads/git_int)…
3. 簡單點說，就是refs/for/mybranch需要經過code review之後才可以提交；refs/heads/mybranch不需要code review。

（since you want to directly push into the branch, rather than create code reviews. Pushing to refs/for/* creates code reviews which must be approved and then submitted. Pushing to refs/heads/* bypasses review entirely, and just enters the commits directly into the branch. The latter does not check committer identity, making it appropriate for importing past project history）
如果需要code review，直接push
$git push origin master
那麼就會有「! [remote rejected] master -> master (prohibited by Gerrit)」的錯誤信息
而這樣push就沒有問題，
$git push origin HEAD:refs/for/mybranch

下面一段是對「refs/for」更詳細的描述：
The documentation for Gerrit explains that you push to the "magical refs/for/'branch' ref using any Git client tool".

This image is taken from the Intro to Gerrit. When you push to Gerrit, you do git push gerrit HEAD:refs/for/. This pushes your changes to the staging area (in the diagram, "Pending Changes"). Gerrit doesn't actually have a branch called ; it lies to the git client.
Internally, Gerrit has it's own implementation for the Git and SSH stacks. This allows it to provide the "magical" refs/for/ refs.
When a push request is received to create a ref in one of these namespaces Gerrit performs its own logic to update the database, and then lies to the client about the result of the operation. A successful result causes the client to believe that Gerrit has created the ref, but in reality Gerrit hasn't created the ref at all.
After a successful patch (i.e, the patch has been pushed to Gerrit, [putting it into the "Pending Changes" staging area], reviewed, and the review has passed), Gerrit pushes the change from the "Pending Changes" into the "Authoritative Repository", calculating which branch to push it into based on the magic it did when you pushed to refs/for/. This way, successfully reviewed patches can be pulled directly from the correct branches of the Authoritative Repository.

Saturday, November 19, 2016

How to binarize image.

* Binary image has following steps:
** To convert image to gray scale.
** To check every pixel if greater than threshold, set value to maximum(255), otherwise minimum(0).

#include <cv.hpp>

using namespace cv;
#define THRESHOLD 100

int main( int argc, char** argv )
{
  Mat image;
  image = imread( "resource/lena.png", IMREAD_COLOR );
  Mat Output( image.rows, image.cols, CV_8UC3, Scalar(0, 0, 0) );
  int height = image.rows;
  int width = image.cols;

  for(int row = 0; row < height; row++) {
      for(int col = 0; col < width; col++) {
          uchar val = (image.at<Vec3b>(row, col)[0] * 0.2999 + image.at<Vec3b>(row, col)[1] * 0.587 + image.at<Vec3b>(row, col)[2] * 0.114);

          Output.at<Vec3b>(row, col)[0] = (val > THRESHOLD ? 255 : 0);
          Output.at<Vec3b>(row, col)[1] = (val > THRESHOLD ? 255 : 0);
          Output.at<Vec3b>(row, col)[2] = (val > THRESHOLD ? 255 : 0);
      }
  }

  namedWindow("out", WINDOW_NORMAL);
  imshow("out", Output);

  waitKey(0);

  return 0;
}

Result:

Friday, November 18, 2016

How to convert grayscale image.

#include <cv.hpp>

using namespace cv;

int main( int argc, char** argv )
{
  Mat image;
  image = imread( "resource/lena.png", IMREAD_COLOR );
  Mat Output( image.rows, image.cols, CV_8UC3, Scalar(0, 0, 0) );
  int height = image.rows;
  int width = image.cols;

  for(int row = 0; row < height; row++) {
      for(int col = 0; col < width; col++) {
          uchar val = (image.at<Vec3b>(row, col)[0] * 0.2999 + image.at<Vec3b>(row, col)[1] * 0.587 + image.at<Vec3b>(row, col)[2] * 0.114);
          Output.at<Vec3b>(row, col)[0] = val;
          Output.at<Vec3b>(row, col)[1] = val;
          Output.at<Vec3b>(row, col)[2] = val;
      }
  }

  namedWindow("out", WINDOW_NORMAL);
  imshow("out", Output);

  waitKey(0);

  return 0;
}

Result: