darcs on Windows

Dear allmydata.org folks (especially RobK and Arno -- my
fellow  
Windows users) and darcs folks:

Have you seen this page?

http:
//wiki.darcs.net/DarcsWiki/WindowsConsoles

I've been running all this time with rxvt.exe, bash, and
with  
CYGWIN="codepage:oem tty binmode title".

I always have the problem of C-c leaving a lock file behind
and the  
problem of having to hit enter after each command, but as
far as I  
know I don't have any other problems, so I'm slightly
skeptical about  
the "worse things could happen" part.

The page is confused by suggesting that rxvt and bash are  
alternatives.  In fact one is a terminal emulator and one is
a shell  
so if you're using rxvt then you're also using bash.  (As I
am.)

I intend to update that page (and to link to it from the
Windows  
Configuration page [1]) after I figure out what it should
say.   
Actually I think I should just delete that page and
integrate its  
contents into WindowsConfiguration (and leave a forward link
from  
WindowsConsoles to WindowsConfiguration).

[1] 
http://wiki.darcs.net/DarcsWiki/WindowsConfiguration

Regards,

Zooko

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zooko wrote:
> Dear allmydata.org folks (especially RobK and Arno --
my fellow Windows 
> users) and darcs folks:
> 
> Have you seen this page?
> 
> http:
//wiki.darcs.net/DarcsWiki/WindowsConsoles
> 
> I've been running all this time with rxvt.exe, bash,
and with 
> CYGWIN="codepage:oem tty binmode title".
> 
> I always have the problem of C-c leaving a lock file
behind and the 
> problem of having to hit enter after each command, but
as far as I know 
> I don't have any other problems, so I'm slightly
skeptical about the 
> "worse things could happen" part.
> 
> The page is confused by suggesting that rxvt and bash
are alternatives.  
> In fact one is a terminal emulator and one is a shell
so if you're using 
> rxvt then you're also using bash.  (As I am.)
> 
> I intend to update that page (and to link to it from
the Windows 
> Configuration page [1]) after I figure out what it
should say.  Actually 
> I think I should just delete that page and integrate
its contents into 
> WindowsConfiguration (and leave a forward link from
WindowsConsoles to 
> WindowsConfiguration).
> 
> [1] 
http://wiki.darcs.net/DarcsWiki/WindowsConfiguration

I'm the one responsible for that page, and I wrote it after
many hours 
spent figuring out why darcs didn't always catch Ctrl-C for
me on Windows. 
  I also consulted the Cygwin folks about how native Windows
programs 
(which darcs is) interact with the console under Cygwin. 
That page is the 
result of my investigations.

I do understand the difference between rxvt and bash.  What
I mean by a 
"Cygwin bash shell" is what you get when you
select "Cygwin bash shell" 
from the start menu.  It's a Windows Console in which Cygwin
bash is 
running, AFAIK.  I can see how this might be confusing -
feel free to edit 
any way you see fit.  The point is to identify the console
environment, not 
the shell, of course.  (the tricky case is the "Cygwin
bash shell", in 
which the behaviour depends on whether you have CYGWIN=tty
or not).

What I mean by "worse things could happen", is
that darcs doesn't get a 
chance to clean up when you hit Ctrl-C.  I don't know a
great deal about 
darcs internals, but I guess it relies on being able to
clean up in order 
to leave the repo in a consistent state.  Maybe it's always
possible to 
recover from a catastrophic failure using 'darcs repair', I
don't know.

Cheers,
	Simon

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On Wed, Aug 29, 2007 at 11:19:58AM +0100, Simon Marlow
wrote:
> What I mean by "worse things could happen",
is that darcs doesn't get a 
> chance to clean up when you hit Ctrl-C.  I don't know a
great deal about 
> darcs internals, but I guess it relies on being able to
clean up in order 
> to leave the repo in a consistent state.  Maybe it's
always possible to 
> recover from a catastrophic failure using 'darcs
repair', I don't know.

On Windows, darcs repair isn't always sufficient, since
there's no atomic
file rename over an existing file, so there's always a small
window between
when we remove the old inventory and when we rename the new.
 But that
*should* be a very small window indeed, and usually repair
should restore
consistency.  I have some ideas that should massively reduce
the sensitive
time during which we wish to block signals (and interrupts),
but that'll
come after the conflicts stuff is coded up, unless someone
beats me to it
(and there was an interested developer on the project).
-- 
David Roundy
http://www.darcs.net
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2007/8/29, David Roundy <daveroundygmail.com>:
> I have some ideas that should massively reduce the
sensitive
> time during which we wish to block signals (and
interrupts), but that'll
> come after the conflicts stuff is coded up, unless
someone beats me to it
> (and there was an interested developer on the
project).

Working on it . Actually
I'm struggling a bit with the Slurpy, and
obviously there's Real Life having high priorities, but
it's
progressing.

At least, I'm keeping the issue busy while David work on The
Big One.

Salvatore
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On Wed, Aug 29, 2007 at 05:24:27PM +0200, Salvatore Insalaco
wrote:
> 2007/8/29, David Roundy <daveroundygmail.com>:
> > I have some ideas that should massively reduce the
sensitive
> > time during which we wish to block signals (and
interrupts), but that'll
> > come after the conflicts stuff is coded up, unless
someone beats me to it
> > (and there was an interested developer on the
project).
> 
> Working on it . Actually
I'm struggling a bit with the Slurpy, and
> obviously there's Real Life having high priorities, but
it's
> progressing.

If you have questions, don't hesitate to ask!

> At least, I'm keeping the issue busy while David work
on The Big One.

Thanks!
-- 
David Roundy
http://www.darcs.net
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