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Re: PITR on Win32 - Archive and Restore

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: markir(at)coretech(dot)co(dot)nz
Cc: Andrew Dunstan <andrew(at)dunslane(dot)net>, tgl(at)sss(dot)pgh(dot)pa(dot)us,pgsql-hackers-win32(at)postgresql(dot)org
Subject: Re: PITR on Win32 - Archive and Restore
Date: 2004-08-11 02:27:03
Message-ID: 200408110227.i7B2R3K11040@candle.pha.pa.us (view raw or flat)
Thread:
Lists: pgsql-hackers-win32pgsql-patches
OK, I have a solution.  It turns out that COPY and COPY.EXE behave
differently.  :-O
	
	# cat x.c   
	#include <stdio.h>
	
	main()
	{
	        system("copy.exe \"c:/msys/1.0/home/bruce momjian/a b\"
	\"c:/msys/1.0/home/bruce momjian/c d\"");
	}
	# gcc -o x x.c
	# ./x
	The system cannot find the file specified.

I just changed copy to copy.exe, and bingo, failure.

I suggest we back out the backslash patch and provide a Win32 sample
archive line in postgresql.conf that quotes both args, and that we add
quotes to the Unix example too.

---------------------------------------------------------------------------

markir(at)coretech(dot)co(dot)nz wrote:
> Funny thing is, now that the "%p" is silently using '\', the "target" path can
> use '/':
> 
> e.g :
> 
> archive_command = 'copy "%p" "c:/databases/pgarchive/%f"'
> 
> *now* works fine. The next interesting question will be "can I use '/' in the
> restore_command too?". I will have a muddle around with it.
> 
> regards
> 
> Mark
> 
> Quoting markir(at)coretech(dot)co(dot)nz:
> 
> > I agree, the approach seems quite nice.
> >
> > I gave the lastest cvs a go  - which is probably cvs as of about 2 hours ago,
> > as
> > a mingw build takes 55 minutes on this machine (compare to 6 minutes when
> > booted into Freebsd... ah well..)
> >
> >
> > Initially tried :
> >
> > archive_command = 'copy "%p" "c:\databases\pgarchive\%f"'
> >
> > But saw errors in the log about "c:databasespgarchive00000..."
> >
> > Looks like '\' needs to be escaped, confirmed this with :
> >
> >
> > archive_command = 'copy "%p" "c:\\databases\\pgarchive\\%f"'
> >
> > Which worked fine. However, it would be nice if the '\' inside the '"' were
> > 'auto-escaped' somehow, as I suspect Mr 'used-windows-all-my-life' will find
> > the current behaviour counter-intuitive.
> >
> > Otherwise looks good
> >
> > Mark
> >
> >
> >
> > Quoting Andrew Dunstan <andrew(at)dunslane(dot)net>:
> >
> > > Tom Lane said:
> > > > Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
> > > >> I have gotten confused by this.  Does COPY work with quoted paths only
> > > >> if we use forward slashes, or was this fix just for the slash issue
> > > >> and not spaces?
> > > >
> > > > This only fixes the slash issue.  If your database path includes spaces
> > > > you'll still need to put quotes in the archive_command, but it
> > > > shouldn't be any worse than
> > > > 	archive_command = 'copy "%p" "c:\someplace\%f"'
> > > >
> > > > I'd appreciate confirmation though from some win32 users that the above
> > > > indeed works.
> > > >
> > >
> > > That's what my experimentation showed, although I worked with a tiny test.c
> > > file rather than the archive command. I think this is the right solution -
> > > the user should put the quotes in, not postgres.
> > >
> > > cheers
> > >
> > > andrew
> > >
> > >
> > >
> > >
> > > ---------------------------(end of broadcast)---------------------------
> > > TIP 1: subscribe and unsubscribe commands go to majordomo(at)postgresql(dot)org
> > >
> >
> >
> >
> >
> 
> 
> 
> 

-- 
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman(at)candle(dot)pha(dot)pa(dot)us               |  (610) 359-1001
  +  If your life is a hard drive,     |  13 Roberts Road
  +  Christ can be your backup.        |  Newtown Square, Pennsylvania 19073

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