git pull报错

在git pull时，偶尔会遇到一个报错：

Unlink of file '.git/objects/pack/old-07de1ebcd020b809a421fceb567977352258b859.idx' failed. Should I try again? (y/n)

不管是y还是n都会不断地出现这种提示信息。

有人说文件被占用了，这个没有试过，如果真的文件被占用了，关掉被占用的文件即可（文件夹也需要关闭）。

看到有个提示信息：

remote: Counting objects: 16, done.
remote: Compressing objects: 100% (16/16), done.
remote: Total 16 (delta 2), reused 0 (delta 0)
Unpacking objects: 100% (16/16), done.
From 10.8.5.131:technique/documents
   fd56988..5662668  master     -> origin/master
Auto packing the repository in background for optimum performance.
See "git help gc" for manual housekeeping.
Counting objects: 19017, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (6867/6867), done.
Writing objects: 100% (19017/19017), done.
Total 19017 (delta 11875), reused 18994 (delta 11863)
Unlink of file '.git/objects/pack/old-07de1ebcd020b809a421fceb567977352258b859.idx' failed. Should I try again? (y/n)

git help gc

虽然提示信息中并没有说因为什么，不过按照提示，可以查看一个git gc的内容。

果然，执行git gc就可以达到效果了。

$ git gc --auto
Auto packing the repository in background for optimum performance.
See "git help gc" for manual housekeeping.
Counting objects: 19017, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (6855/6855), done.
Writing objects: 100% (19017/19017), done.
Total 19017 (delta 11875), reused 19017 (delta 11875)
Removing duplicate objects: 100% (256/256), done.

最后有个提示：

Removing duplicate objects

也就是说这个问题是因为重复文件导致的。

再继续git pull，一切ok了。