fixup! fix(docker): wdirgitindex from git rev-parse --git-dir

Co-authored-by: George L. Yermulnik <yz@yz.kiev.ua>

Author: AndyAtTib

tools/entrypoint.sh

@@ -39,8 +39,7 @@ wdir="$(pwd)"
 if ! su-exec "$USERID" "$BASHPATH" -c "test -w $wdir && test -r $wdir"; then
   echo_error_and_exit "uid:gid $USERID lacks permissions to $wdir/"
 fi
-wdirgitdir="$(git rev-parse --git-dir)" || echo_error_and_exit "Cannot determine Git directory"
-wdirgitindex="${wdirgitdir}/index"
+wdirgitindex="$(git rev-parse --git-dir 2>&1)/index" || echo_error_and_exit "${wdirgitindex%/index}"
 if ! su-exec "$USERID" "$BASHPATH" -c "test -w $wdirgitindex && test -r $wdirgitindex"; then
   echo_error_and_exit "uid:gid $USERID cannot write to $wdirgitindex"
 fi