pod install
Analyzing dependencies
[!] Pod::Executable pull
error: cannot open .git/FETCH_HEAD: Permission denied
*************
http://stackoverflow.com/questions/16049335/cocoapods-pod-install-permission-denied
I solve this problem by running the following command:
sudo chown -R username.groupname ~/Library/Caches/CocoaPods
and
sudo chown -R username.groupname ~/.cocoapods
Please replace username and groupname with your Mac login username/groupname.
或者
Will-mini:Caches willbin$ sudo chown -R $USER
~/Library/Caches/CocoaPods/
Will-mini:Caches willbin$ sudo chown -R $USER
~/.cocoapods
[pod install] error: cannot open .git/FETCH_HEAD: Permission denied
原文：http://www.cnblogs.com/willbin/p/3548676.html