经常需要给代码打补丁，但是发现自己不会打补丁，经常看着补丁改代码，效率那是一个低啊，不会就学学呗，反正patch有-R回退，不怕出错。
/*****************************************************************************
* Linux diff patch
* 声明：
* 经常需要给代码打补丁，但是发现自己不会打补丁，经常看着补丁改代码，效率
* 那是一个低啊，不会就学学呗，反正patch有-R回退，不怕出错。
*
* 2015-12-28 深圳 南山平山村 曾剑锋
****************************************************************************/
\\\\\\-*- 目录 -*-//////
| 参考文章：
| 一、cat main1.c
| 二、cat main2.c
| 三、execute diff:
| 四、execute patch:
| 五、patch back:
-----------------------
参考文章：
1. 用Diff和Patch工具维护源码
http://www.ibm.com/developerworks/cn/linux/l-diffp/index.html
2. diff和patch使用指南
http://www.cnblogs.com/cute/archive/2011/04/29/2033011.html
3. 补丁格式 diff patch
http://blog.sina.com.cn/s/blog_51cea4040101atql.html
一、cat main1.c
#include <stdio.h>
int main( int argc, char **argv )
{
printf( " zengjf test for diff and patch.\n" );
}
二、cat main2.c
#include <stdio.h>
int main( int argc, char **argv )
{
printf( " zengjf test for diff and patch.\n" );
}
三、execute diff:
1. $: diff -Nur main1.c main2.c > main.patch
2. 在当前目录下生成了main.patch文件:
--- main1.c 2015-12-28 20:36:49.388152208 +0800
+++ main2.c 2015-12-28 20:25:17.376180914 +0800
@@ -2,5 +2,8 @@
int main( int argc, char **argv )
{
+
+
+
printf( " zengjf test for diff and patch.\n" );
}
四、execute patch:
1. 当前目录下有：main1.c main2.c main.patch
2. cat main1.c
#include <stdio.h>
int main( int argc, char **argv )
{
printf( " zengjf test for diff and patch.\n" );
}
3. $: patch -p0 < main.patch <right>
patching file main1.c
4. cat main1.c
#include <stdio.h>
int main( int argc, char **argv )
{
printf( " zengjf test for diff and patch.\n" );
}
5. $: patch p0 < main.patch <error>
patching file p0
Hunk #1 FAILED at 2.
out of hunk FAILED -- saving rejects to file p0.rej
6. $: patch -p1 < main.patch <error>
can't find file to patch at input line 3
Perhaps you used the wrong -p or --strip option?
The text leading up to this was:
----------------------------------
|--- main1.c 2015-12-28 20:36:49.388152208 +0800
|--- main2.c 2015-12-28 20:25:17.376180914 +0800
----------------------------------
File to patch: <cursor>
7. $: patch -p0 main.patch <error>
^C
五、patch back:
1. 当前目录下有：main1.c main2.c main.patch
2. cat main1.c
#include <stdio.h>
int main( int argc, char **argv )
{
printf( " zengjf test for diff and patch.\n" );
}
3. $: patch -p0 -R < main.patch
patching file main1.c
4. cat main1.c
#include <stdio.h>
int main( int argc, char **argv )
{
printf( " zengjf test for diff and patch.\n" );
}
六、实例分析：
1. patch 部分内容：
diff --git a/proguard.flags b/proguard.flags
index 6d41d17..ffbc39a 100644
--- a/proguard.flags
+++ b/proguard.flags
@@ -11,4 +11,4 @@
-keep class com.android.settings.MasterClearConfirm
-keep class com.android.settings.accounts.*
-keep class com.android.settings.fuelgauge.*
-
+-keep class com.android.settings.ethernet.*
2. 解析：@@ -11,4 +11,4 @@
1. @@ -表示代表a/proguard.flags文件；
2. 11代表下面显示的代码是从a/proguard.flags文件的第11行开始；
3. 4代表a/proguard.flags被操作了；
4. +代表b/proguard.flags文件
5. 11代表下面显示的代码是从b/proguard.flags文件的第11行开始；
6. 4代表b/proguard.flags被操作了；
7. @@ 代表结束
