tree f416bba494f42af1b55bb17babb0d05be3666ed8
parent bbab0a675ef29b0eaa96054a69ada63fc3051c51
author Hugh McMaster <hugh.mcmaster@outlook.com> 1633432899 +1100
committer Werner Lemberg <wl@gnu.org> 1633455867 +0200

autogen.sh: Only copy submodules if building from a git branch.

`autogen.sh` fails if building from a standard source tarball.  Firstly, git
expects to be called in a git repository, then `copy_submodule_files`
blindly attempts to copy files.

Debian, Ubuntu, Linux Mint, and other derivatives all run `autogen.sh`
before compiling to regenerate build files.

This patch ensures that various git commands are only called and 'dlg' files
are only copied if `autogen.sh` is called from a git repository.