Re: hydra and t632

[Efraim Flashner]

On Thu, Oct 22, 2020 at 03:37:02AM -0400, Thien-Thi Nguyen wrote:
> () Efraim Flashner <efraim@flashner.co.il>
> () Thu, 22 Oct 2020 10:00:10 +0300
> 
>    [timeout red herring]
> 
>    And with timeout removed completely:
> 
>    Command exited with non-zero status 2
>    0.37user 0.13system 0:00.63elapsed 80%CPU (0avgtext+0avgdata 
> 27372maxresident)k
>    192inputs+1552outputs (1major+17323minor)pagefaults 0swaps
>    // output from t632.d/signal-handling-out-and-err:
>    t632.d/x,v  -->  t632.d/x
>    revision 1.1 (locked)
>    writable t632.d/x exists; remove it? [ny](n):
>    co: checkout aborted
> 
> Hmmm, interesting!  On my system, this blocks completely until i
> type ‘C-c’, then it PASSes because the underlying ‘co’ DTRT.  So
> it seems timeout has nothing to do w/ the root cause.  Good,
> we're making progress.
> 
>    > Another possiblity is (c) ‘co’ is not detecting the TTY, but that
>    > is doubtful since t632.d/signal-handling-out-and-err has the line
>    > 
>    >   writable t632.d/x exists; remove it? [ny](n): 
>    > 
>    > which shows ‘co’ initiating user-interaction, which it only does
>    > if it has detected the TTY.
> 
>    How does it detect the TTY?
> 
> It boils down to a call to ‘isatty (STDIN_FILENO)’ (see
> src/rcsgen.c:193).
> 
>    It could be that it detects the
>    TTY but it's not actually useable.
> 
> I suppose that "useable" means the ‘getc (in)’ (see
> src/rcsgen.c:208) works.
> 
>    From the build environment:
>    output of "which tty":
>    /gnu/store/57xj5gcy1jbl9ai2lnrqnpr0dald9i65-coreutils-8.32/bin/tty
> 
>    output of "ls -la /dev/tt*":
>    ls: cannot access '/dev/tt*': No such file or directory
> 
> No, you have to run that program; it prints out the tty:
> 
>  $ which tty
>  /usr/bin/tty
>  $ tty
>  /dev/pts/6
>  $ ls -l $(tty)
>  crw--w---- 1 ttn tty 136, 6 ott 22 03:32 /dev/pts/6
> 

Rather than convert it from guile to shell:
(display (which "tty"))
/gnu/store/57xj5gcy1jbl9ai2lnrqnpr0dald9i65-coreutils-8.32/bin/tty

(system* (which "tty"))
not a tty

(system* "ls" "-la" (which "tty"))
-r-xr-xr-x 2 0 0 46584 Jan  1  1970 
/gnu/store/57xj5gcy1jbl9ai2lnrqnpr0dald9i65-coreutils-8.32/bin/tty




-- 
Efraim Flashner   <efraim@flashner.co.il>   אפרים פלשנר
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