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今天不知怎么回事，git 突然不能add修改文件，错误信息如下，但是很奇怪的是git status 没有问题，依然正常工作

[root@test01 test_code_driver]# git add test_prefix.h
fatal: Unable to create ‘/media/sf_nginx/H2_20151103/H2/.git/index.lock‘: File exists.


If no other git process is currently running, this probably means a
git process crashed in this repository earlier. Make sure no other git
process is running and remove the file manually to continue.

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在网上查看了相关解决方案，于是在本地仓库.git文件夹下面，删除index.lock

drwxrwxrwx 1 root root ? ? ?0 Nov ?3 16:57 branches
-rwxrwxrwx 1 root root ? ? 30 Nov 18 17:50 COMMIT_EDITMSG
-rwxrwxrwx 1 root root ? ?503 Nov ?9 11:23 config
-rwxrwxrwx 1 root root ? ? 73 Nov ?3 16:57 description
-rwxrwxrwx 1 root root ?13762 Nov 19 13:56 FETCH_HEAD
-rwxrwxrwx 1 root root ? ? 48 Nov ?9 14:32 HEAD
drwxrwxrwx 1 root root ? 4096 Nov ?3 16:57 hooks
-rwxrwxrwx 1 root root 325171 Nov 18 17:50 index
-rwxrwxrwx 1 root root ? ? ?0 Nov 18 18:04 index.lock
drwxrwxrwx 1 root root ? ? ?0 Nov ?3 16:57 info
drwxrwxrwx 1 root root ? ? ?0 Nov ?3 16:57 logs
drwxrwxrwx 1 root root ? ? ?0 Nov ?5 17:30 modules
drwxrwxrwx 1 root root ?40960 Nov 16 18:10 objects
-rwxrwxrwx 1 root root ? ? 41 Nov ?9 11:23 ORIG_HEAD
-rwxrwxrwx 1 root root ? 9374 Nov ?3 16:57 packed-refs
drwxrwxrwx 1 root root ? ? ?0 Nov ?9 10:23 refs
-rwxrwxrwx 1 root root ? ?805 Nov 19 ?2015 sourcetreeconfig
[root@test01 .git]# rm -f index.lock

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问题解决，git可以正常工作

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具体原因有时间再看