add instructions for git setup in README

README.md

@@ -72,3 +72,51 @@ create with
 baseproxy=$HOME/.globus/base.proxy
 grid-proxy-init -cert usercert.pem -key userkey.pem -out $baseproxy -valid 10000:00
 ```
+
+# Setup git directory on server and push changes
+
+```
+mkdir git-config
+cd git-config
+git init
+git config receive.denyCurrentBranch updateInstead
+```
+
+Then locally add remote and push to server, e.g. (assuming xcache1 is in ssh config)
+
+```
+git remote add xcache1 xcache1:git-config
+git push xcache1 <branch-name>
+```
+
+If the pushed branch is checked out on the server and there are no untracked
+changes this will update the files on the server.
+
+On the server, set the worktree to `/`
+
+```
+# optionally check out branch, if not default
+git checkout <branch-name>
+# set worktree to /
+git config core.worktree /
+# don't track README on the server
+git update-index --assume-unchanged /README.md
+# clear files, except .git
+rm -r *
+```
+
+From now on, pushes to the server will update files in-place (if there are no
+untracked modifications).
+
+Check status on server, ignoring untracked files
+```
+git status -uno
+```
+
+Optionally one can commit on the server and pull the changes down to the local
+repository. But for that one needs to configure a user name and email (can only be one at at time).
+
+```
+git config user.name "<user-name>"
+git config user.email "<user-email>"
+```