Question

This question is based on the thread.

I have the following Git-prompt at the moment.
I get the following warning after cding to a non-Git folder.

fatal: Not a git repository (or any of the parent directories): .git                   
fatal: git diff [--no-index] takes two paths
fatal: Not a git repository (or any of the parent directories): .git
fatal: git diff [--no-index] takes two paths

My current code for Git-prompt in Zsh

 # get the name of the branch we are on
 git_prompt_info() {
     ref=$(git symbolic-ref HEAD | cut -d'/' -f3)
     echo $ref
 }
 get_git_dirty() {
   git diff --quiet || echo '*'                                                   
 }
 autoload -U colors
 colors
 setopt prompt_subst
 PROMPT='%{$fg[blue]%}%c %{$fg_bold[red]%}$(git_prompt_info)$(get_git_dirty)%{$fg[blue]%} $ %{$reset_color%}'

The problem is the following code which causes the warning for non-Git folders

get_git_dirty() {
       git diff --quiet || echo '*'                                                   
     }

I tried to solve the bug by redirecting errors to /tmp/ unsuccessfully such that

  get_git_dirty() {
           git diff --quiet 2>/tmp/error || echo '*' 2>/tmp/error                                                   
   }

How can you get rid of the warning messages for non-git directories?

Answer 1

Use

REL=$(git rev-parse --show-prefix 2>/dev/null) || { echo "$@" ; exit ; }

or

BR=$(git symbolic-ref HEAD 2>/dev/null) || { echo "$@" ; exit ; }

Exit early.

To be more explicit: you can’t use exit status of git diff --quiet to check whether you are in working repository because git diff then “exits with 1 if there were differences and 0 means no differences.” (see git-diff manpage)