[Bug-gnu-pw-mgr] Another use case for web login

[NIIBE Yutaka]

Hello,

Thanks for useful program.

Now, I use assword [0] to login identi.ca [1].  (I used to use OpenID
to login identi.ca, but OpenID support was removed.)

I invoke assword through application launcher by typing Alt-F2 (I'm
using Xfce and Gnome desktop) on the window of the web browser, and
input "assword gui" to the launcher.  Assword asks context name by its
own GUI dialog box, then, password will be generated as X input to the
web browser.

gnu-pw-mgr can be used like that with a helper program.  We will be
able to have a GUI program which asks user password identifier by its
dialog box and it invokes gnu-pw-mgr, and then, it puts generated
password to the window that had focus.  (Giving password identifier by
command line is not an option for me, as it would be weaker by some
attacks).

Currently, the function stdin_pwid in gnu-pw-mgr.c assumes that
stdin/stdout is connected to TTY when it reads password identifier.
Could we remove this restriction, so that gnu-pw-mgr can be used by a
program (with no need to allocate pty)?

I'm talking about the line 357-358:

    if (! isatty(STDIN_FILENO) || ! isatty(STDOUT_FILENO))
        usage_message( no_pwid_fmt);

What do you think?

[0] http://finestructure.net/assword/
[1] https://identi.ca/gniibe
--