From: Jason A. Donenfeld <jason@zx2c4.com>
Date: Sat, 25 May 2013 11:35:25 GMT
Subject: Re: [PATCH v2] config: allow inaccessible configuration under $HOME
Message-ID: <CAHmME9rYH2kuvxafg10kYRa8kiOLeBeY9UuwUMNOeQdTbvhf+g@mail.gmail.com>
In-Reply-To: <20130412210318.GU27070@google.com>

Jonathan's patch would indeed be nice. In cgit, we are forced to do
ugly things like this:

        /* Do not look in /etc/ for gitconfig and gitattributes. */
        setenv("GIT_CONFIG_NOSYSTEM", "1", 1);
        setenv("GIT_ATTR_NOSYSTEM", "1", 1);

        /* We unset HOME and XDG_CONFIG_HOME before calling the git
setup function
         * so that we don't make unneccessary filesystem accesses. */
        user_home = getenv("HOME");
        xdg_home = getenv("XDG_CONFIG_HOME");
        unsetenv("HOME");
        unsetenv("XDG_CONFIG_HOME");

        /* Setup the git directory and initialize the notes system.
Both of these
         * load local configuration from the git repository, so we do
them both while
         * the HOME variables are unset. */
        setup_git_directory_gently(&nongit);
        init_display_notes(NULL);

        /* We restore the unset variables afterward. */
        if (user_home)
                setenv("HOME", user_home, 1);
        if (xdg_home)
                setenv("XDG_CONFIG_HOME", xdg_home, 1);

A big nasty guard around the git setup function, so that we don't error out.