[BUG?] sftp is echoing back prompt and commands in batch mode

[Vincenzo Romano]

Thanks, Iain.
I am willing to hear from other users whether anyone else sees this as a
bug before filing it.


--
Vincenzo Romano

Il giorno ven 2 nov 2018, 20:03 Iain Morgan <imorgan at nas.nasa.gov> ha
scritto:

> If you truly intend this as a bug report, you should file it at
> bugzilla.mindrot.org.
>
> On Fri, Nov 02, 2018 at 12:25:22 +0100, Vincenzo Romano wrote:
> > Short description: All comands sent to server in batch mode are being
> > echoed back along with prompt.
> > Software Version: "OpenSSH_7.9p1, OpenSSL 1.1.1  11 Sep 2018" (as
> > printed by ssh -V)
> > Server and client systems: ArchLinux x86_64 fully updated as of
> 2018-11-02.
> >
> > ## How to reproduce
> >
> > Provided that you have proper SSH key authentication in place, from
> > command line run:
> > echo "dir /var" | sftp -b - 0
> >
> > ## Expected output
> >
> > /var/backups    /var/cache      /var/lib        /var/local      /var/lock
> > /var/log        /var/mail       /var/opt        /var/puppet     /var/run
> > /var/spool      /var/tmp        /var/www
> >
> > ## Actual output
> >
> > sftp> dir /var
> > /var/backups    /var/cache      /var/lib        /var/local      /var/lock
> > /var/log        /var/mail       /var/opt        /var/puppet     /var/run
> > /var/spool      /var/tmp        /var/www
> >
> > Please note the first line is the server prompt followed by the command
> echo.
> >
> > ## Workaround
> >
> > Expunge the first line from the client output
> > echo "dir /var" | sftp -b - 0 | tail -n +2
> >
> > ## Notes
> > Batch mode is meant for script automation, not human operations, so
> > echoing the prompt and the commands doesn't make any sense and creates
> > problems while processing the output.
> > A possible solution that's also backward compatible with all scripts
> > using batch mode is to allow for a special prefix character to
> > commands to avoid any echoing, just like the "-" is used to avoid a
> > single failing command to terminate the client. Something like "@" or
> > "#" would be ok IMHO.
> >
> > --
> > Vincenzo Romano - NotOrAnd.IT
> > Information Technologies
> > --
> > NON QVIETIS MARIBVS NAVTA PERITVS
> > _______________________________________________
> > openssh-unix-dev mailing list
> > openssh-unix-dev at mindrot.org
> > https://lists.mindrot.org/mailman/listinfo/openssh-unix-dev
>
> --
> Iain Morgan
>

Il giorno ven 2 nov 2018, 20:03 Iain Morgan <imorgan at nas.nasa.gov> ha
scritto:

> If you truly intend this as a bug report, you should file it at
> bugzilla.mindrot.org.
>
> On Fri, Nov 02, 2018 at 12:25:22 +0100, Vincenzo Romano wrote:
> > Short description: All comands sent to server in batch mode are being
> > echoed back along with prompt.
> > Software Version: "OpenSSH_7.9p1, OpenSSL 1.1.1  11 Sep 2018" (as
> > printed by ssh -V)
> > Server and client systems: ArchLinux x86_64 fully updated as of
> 2018-11-02.
> >
> > ## How to reproduce
> >
> > Provided that you have proper SSH key authentication in place, from
> > command line run:
> > echo "dir /var" | sftp -b - 0
> >
> > ## Expected output
> >
> > /var/backups    /var/cache      /var/lib        /var/local      /var/lock
> > /var/log        /var/mail       /var/opt        /var/puppet     /var/run
> > /var/spool      /var/tmp        /var/www
> >
> > ## Actual output
> >
> > sftp> dir /var
> > /var/backups    /var/cache      /var/lib        /var/local      /var/lock
> > /var/log        /var/mail       /var/opt        /var/puppet     /var/run
> > /var/spool      /var/tmp        /var/www
> >
> > Please note the first line is the server prompt followed by the command
> echo.
> >
> > ## Workaround
> >
> > Expunge the first line from the client output
> > echo "dir /var" | sftp -b - 0 | tail -n +2
> >
> > ## Notes
> > Batch mode is meant for script automation, not human operations, so
> > echoing the prompt and the commands doesn't make any sense and creates
> > problems while processing the output.
> > A possible solution that's also backward compatible with all scripts
> > using batch mode is to allow for a special prefix character to
> > commands to avoid any echoing, just like the "-" is used to avoid a
> > single failing command to terminate the client. Something like "@" or
> > "#" would be ok IMHO.
> >
> > --
> > Vincenzo Romano - NotOrAnd.IT
> > Information Technologies
> > --
> > NON QVIETIS MARIBVS NAVTA PERITVS
> > _______________________________________________
> > openssh-unix-dev mailing list
> > openssh-unix-dev at mindrot.org
> > https://lists.mindrot.org/mailman/listinfo/openssh-unix-dev
>
> --
> Iain Morgan
>