git pull for a local repository at specified location (instead of pwd)

Question

pwd is "present working directory". Here's the situation.

pwd:            /path/to/pwd/
git repository: /repo/path/.git/

I want to do a git pull from origin, but without changing my current directory.

To clarify just a little more in case I'm not clear enough, this is the result I want, but I want to do it with one command instead of having to change directories:

$ cd /repo/path
$ git pull origin master
$ cd -

Answer 1

git --work-tree=/repo/path --git-dir=/repo/path/.git pull origin master

Answer 2

bash -c "cd /repo/path; git pull origin master"