How to update and commit only file permissions?

I tried

git update-index --chmod=+x docker.sh

and after that

git ls-tree HEAD

It shows

100644 blog d8....

and

ls -lah docker.sh

-rwxr-xr-x 1 f85147 1049089 2.1K Dec 19 14:22 docker.sh*

Why?

I tried from WINDOWS CMD nad with git bash and got the same. I want to change locally and push to Bitbucket.

Solution

git ls-tree HEAD shows the tree from HEAD, that is the last commit. Your change is not yet committed. git update-index updates index, not HEAD. After git update-index --chmod=+x docker.sh do git commit then repeat git ls-tree HEAD.