git技法-对比master和release两个版本差异提交

有时某个项目遇到疑难问题，发现早期版本正常，现在的版本异常，而从代码或日志分析异常困难，这时通过二分法夹版本会更加快捷有效，而两个版本的差异提交如何看呢？

1. 查看两个版本差异代码文件细节

:~/qcom/hal/mm-camerasdk$ git diff r2s/sm8250/master  r2s/sm8250/release --stat
 api/common/chituningmodeparam.h                             |      3 +-
 api/stats/chistatspropertydefines.h                         |      1 -
 core/chifeature2/chifeature2base.cpp                        |      9 +-
 core/chifeature2/chifeature2base.h                          |      1 -
 core/chifeature2/chifeature2requestobject.cpp               |      5 +-
 core/chiframework/chxextensionmodule.h                      |      6 +-
 core/chiofflinepostproclib/chiofflinepostprocencode.cpp     |      9 +-
 core/chiusecase/chxadvancedcamerausecase.cpp                |     11 +-

2. 指定文件的详细差异

~/qcom/hal/mm-camerasdk$ git diff r2s/sm8250/master  r2s/sm8250/release api/common/chituningmodeparam.h  
diff --git a/api/common/chituningmodeparam.h b/api/common/chituningmodeparam.h
index 1b8476be283..fdb3c6cddda 100755
--- a/api/common/chituningmodeparam.h
+++ b/api/common/chituningmodeparam.h
@@ -43,7 +43,8 @@ enum class ChiModeUsecaseSubModeType
     Video    = 2,
     ZSL      = 3,
     Liveshot = 4,
-    IDEALRAW = 5
+    SnapshotReprocess = 5,
+    IDEALRAW = 6

3. git diff r2s/sm8250/master r2s/sm8250/release 则会显示所有文件差异。
4. git diff r2s/sm8250/master…r2s/sm8250/release 查看release中比master中多提交了哪些内容，反着写显示效果完全不一样。

:~/qcom/hal/mm-camerasdk$ git diff r2s/sm8250/master..r2s/sm8250/release   
diff --git a/api/common/chituningmodeparam.h b/api/common/chituningmodeparam.h
index 1b8476be283..fdb3c6cddda 100755
--- a/api/common/chituningmodeparam.h
+++ b/api/common/chituningmodeparam.h
@@ -43,7 +43,8 @@ enum class ChiModeUsecaseSubModeType
     Video    = 2,
     ZSL      = 3,
     Liveshot = 4,
-    IDEALRAW = 5
+    SnapshotReprocess = 5,
+    IDEALRAW = 6
 };

:~/qcom/hal/mm-camerasdk$ git diff r2s/sm8250/release..r2s/sm8250/master                    
diff --git a/api/common/chituningmodeparam.h b/api/common/chituningmodeparam.h
index fdb3c6cddda..1b8476be283 100755
--- a/api/common/chituningmodeparam.h
+++ b/api/common/chituningmodeparam.h
@@ -43,8 +43,7 @@ enum class ChiModeUsecaseSubModeType
     Video    = 2,
     ZSL      = 3,
     Liveshot = 4,
-    SnapshotReprocess = 5,
-    IDEALRAW = 6
+    IDEALRAW = 5
 };

6. git diff r2s/sm8250/master…r2s/sm8250/release 查看release和master所有差异点
7. git log r2s/sm8250/master…r2s/sm8250/release 查看以git log的方式展示差异
8. git log -lefg-right r2s/sm8250/release…r2s/sm8250/master 显示提交在哪个分支上。
9. git rev-list r2s/sm8250/master…r2s/sm8250/release 查看release中比master中多的提交，只显示commitid，不显示内容。
10. 除了gerrit有Change-Id，切了分支也不会变化，但Commit id，切了分支后就变化了，所以对比commitid也无法对比差异。可以git log -1000 > master.txt ，再 git log -1000 > release.txt，然后对比工具对比master.txt和 release.txt发现最下面的都一样，最上面存在合入顺序上的差异，以及差异提交。可以把message里的一行描述grep出来进行对比。也可以把这一行message复制到excel里，出现两次就是都存在的提交，出现1次就是独有的提交。
    1:共有的
    2：master独有的
    3：release独有的