execute git command inside bash script

Question

I am writing gitosis post-push hook for central repository

which pulls updates from central repository to testing enviroment

nano /var/git/repositories/holding.git/hooks/post-update

 #!/bin/bash

 cd /var/vh/holding;
 git reset --hard;
 git checkout testing;
 git pull;

here what I get after push on my client (development VM)

# blah ...
Counting objects: 57, done.
Compressing objects: 100% (24/24), done.
Writing objects: 100% (30/30), 3.42 KiB, done.
Total 30 (delta 18), reused 0 (delta 0)
fatal: Not a git repository: '.'
fatal: Not a git repository: '.'
fatal: Not a git repository: '.'
fatal: Not a git repository: '.'
To [email protected]:holding.git
   233b5a2..0f46cd8  testing -> testing

Obviously, my attempt to tell git, where it should do pull, failed.

What is correct way to run git command for a specified working copy in bash script?

Answer 1

As mentioned here or there, you could precede all your git commands with:

 env -i

in order to make sure there is no side effect with, for instance, a GIT_DIR environment variable which could have been previously set.
(env -i or simply: unset GIT_DIR)