解決 gpg: Can't check signature: public key not found

repo init 的時候出現錯誤 
object 12fd10c20115046dcd2fbe468a45e566f38ffbc9 
type commit 
tag v1.12.7 
tagger Conley Owens <[email protected]> 1381959964 -0700 

repo 1.12.7 

gpg: Signature made 2013年10月17日 星期四 05時46分04秒 CST using RSA key ID 692B382C 
gpg: Can't check signature: public key not found 
error: could not verify the tag 'v1.12.7' 

解決： 
curl http://commondatastorage.googleapis.com/git-repo-downloads/repo > ~/bin/repo 
chmod a+x ~/bin/repo