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From: Pieter de Goeje <pieter@degoeje.nl>
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Date: Thu, 29 Mar 2007 19:04:59 +0200
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Cc: Dag-Erling =?iso-8859-1?q?Sm=F8rgrav?= <des@des.no>, current@freebsd.org,
	Nate Lawson <nate@root.org>
Subject: Re: libfetch ftp patch for less latency
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On donderdag 29 maart 2007, Dag-Erling Sm=F8rgrav wrote:
> Nate Lawson <nate@root.org> writes:
> > To speed up pkg_add and other ftp command channel performance over slow
> >
> > links, change this:
> >>>> PWD
> >
> > <<< 257 "/"
> >
> >>>> CWD pub
> >
> > <<< 250 Directory successfully changed.
> >
> >>>> CWD FreeBSD
> >
> > <<< 250 Directory successfully changed.
> >
> >>>> CWD ports
> >
> > <<< 250 Directory successfully changed.
> >
> >>>> CWD amd64
> >
> > <<< 250 Directory successfully changed.
> >
> >>>> CWD packages-6-stable
> >
> > <<< 250 Directory successfully changed.
> >
> >>>> CWD Latest
> >
> > <<< 250 Directory successfully changed.
> >
> >>>> MODE S
> >
> > Into this:
> >>>> PWD
> >
> > <<< 257 "/"
> >
> >>>> CWD pub/FreeBSD/ports/amd64/packages-6-stable/Latest
Why not put the / before the path? That way you don't need to 'PWD' first.
> >
> > <<< 250 Directory successfully changed.
>
> No.  This is a violation of the FTP protocol.
I'm reading rfc 959 right now, and it include examples of CWD with full=20
pathname (multiple directories). Actually the rfc is kinda vague about this.
>
> > All ftp servers I've ever seen support a full path when changing down
> > dirs. This might be a DOS ftp server thing however.  In any case, if
> > there is an error to the all-in-one CWD, the code reverts back to legacy
> > behavior of multiple CWDs.
>
> When the all-in-one CWD fails, you're SOL.  You have no idea what
> state the server is in, and you have to start over.
Agreed.
>
> DES

Regards,
Pieter de Goeje