1-- clone分支，修改文件本地commit后， push回原分支失败，报错：
git push
hap@192.168.1.2‘s password:
Counting objects: 21, done.
Compressing objects: 100% (11/11), done.
Writing objects: 100% (11/11), 1010 bytes, done.
Total 11 (delta 9), reused 0 (delta 0)
error: refusing to update checked out branch: refs/heads/master
error: By default, updating the current branch in a non-bare repository
error: is denied, because it will make the index and work tree inconsistent
error: with what you pushed, and will require ‘git reset --hard‘ to match
error: the work tree to HEAD.
error:
error: You can set ‘receive.denyCurrentBranch‘ configuration variable to
error: ‘ignore‘ or ‘warn‘ in the remote repository to allow pushing into
error: its current branch; however, this is not recommended unless you
error: arranged to update its work tree to match what you pushed in some
error: other way.
error:
error: To squelch this message and still keep the default behaviour, set
error: ‘receive.denyCurrentBranch‘ configuration variable to ‘refuse‘.
To git+ssh://hap@192.168.1.2/media/LINUXDATA/working
! [remote rejected] master -> master (branch is currently checked out)
error: failed to push some refs to ‘git+ssh://hap@192.168.1.2/media/LINUXDATA/working‘
参照如下链接，目标repo中执行 $ git config ‘receive.denyCurrentBranch‘ warn 后OK
2-- 新增文件add commit后，push回原分支失败，报错：
Counting objects: 20, done.
Delta compression using up to 24 threads.
Compressing objects: 100% (11/11), done.
Writing objects: 100% (11/11), 1.30 KiB, done.
Total 11 (delta 5), reused 0 (delta 0)
error: insufficient permission for adding an object to repository database ./objects
参照如下链接，查看原repo .git目录权限，发现.git/object/没有group写权限导致；执行 $ sudo chmod g+w -R .git/object 后OK
3-- git clone/git clone --bare/git clone --mirror 区别
4-- does not appear to be a git repository
这种问题，权限问题居多，看看整个repo目录 全路径上面用户、组权权限，是否允许访问
原文：http://www.cnblogs.com/damoco/p/4007511.html