From dc579a0dfbfacbfee865b1486f5717a286a92fcb Mon Sep 17 00:00:00 2001
From: Tim Pope <code@tpope.net>
Date: Thu, 29 Jul 2021 08:27:44 -0400
Subject: [PATCH] Don't trust git --version with nonzero exit status

This prevents parsing `zsh:1: command not found: git` as version "1:".

References: https://github.com/tpope/vim-fugitive/issues/1801
---
 autoload/fugitive.vim | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/autoload/fugitive.vim b/autoload/fugitive.vim
index 513c6c3..a7964f1 100644
--- a/autoload/fugitive.vim
+++ b/autoload/fugitive.vim
@@ -321,7 +321,8 @@ let s:git_versions = {}
 function! fugitive#GitVersion(...) abort
   let git = s:GitShellCmd()
   if !has_key(s:git_versions, git)
-    let s:git_versions[git] = matchstr(s:SystemError(s:GitCmd() + ['--version'])[0], '\d[^[:space:]]\+')
+    let [out, exec_error] = s:SystemError(s:GitCmd() + ['--version'])
+    let s:git_versions[git] = exec_error ? '' : matchstr(out, '\d[^[:space:]]\+')
   endif
   if !a:0
     return s:git_versions[git]