Re: pg_upgrade diffs on WIndows - Mailing list pgsql-hackers

On 09/05/2012 09:46 AM, Andrew Dunstan wrote:
>
> On 09/05/2012 09:11 AM, Bruce Momjian wrote:
>>
>> I reviewed this idea and supports this patch's inclusion in 9.2.  I was
>> unclear why it was needed, but I see pg_dumpall, which is the file
>> pg_upgrade splits apart, as also using binary mode to write this file:
>>
>>             OPF = fopen(filename, PG_BINARY_W);
>>
>> I agree with Tom that pg_upgrade needs some quiet time.  ;-) Andrew,
>> have a sufficient number of buildfarm members verified our recent
>> patches that this can be added.  My patch from last night was mostly C
>> comments so isn't something that needs testing.
>
>
> I am quite happy not committing anything for now.
>
> There are two buildfarm members doing pg_upgrade tests: crake (Fedora 
> 16) and pitta (Windows/Mingw64). The buildfarm code is experimental 
> and not in any release yet, and when it is the test will be optional.
>
> The PG_BINARY_W change has only been verified on a non-buildfarm setup 
> on my laptop (Mingw)
>
> Note that while it does look like there's a bug either in pg_upgrade 
> or pg_dumpall, it's probably mostly harmless (adding some spurious CRs 
> to function code bodies on Windows). I'd feel happier if it didn't, 
> and happier still if I knew for sure the ultimate origin. Your 
> pg_dumpall discovery above is interesting. I might have time later on 
> today to delve into all this. I'm out of contact for the next few hours.


OK, I now have a complete handle on what's going on here, and withdraw 
my earlier statement that I am confused on this issue :-)

First, one lot of CRs is produced because the pg_upgrade test script 
calls pg_dumpall without -f and redirects that to a file, which Windows 
kindly opens on text mode. The solution to that is to change the test 
script to use pg_dumpall -f instead.

The second lot of CRs (seen in the second dump file in the diff i 
previously sent) is produced by pg_upgrade writing its output in text 
mode, which turns LF into CRLF. The solution to that is the patch to 
dump.c I posted, which, as Bruce observed, does the same thing that 
pg_dumpall does. Arguably, it should also open the input file in binary, 
so that if there really is a CRLF in the dump it won't be eaten.

Another question is whether or not pg_dumpall (and pg_dump in text mode 
too for that matter) should be trying to suppress newline translation on 
its output even to stdout. It already does that for non-text formats 
(see call to setmode()) but I don't see why we shouldn't for text as 
well. But those are obviously longstanding bugs that we can leave to 
another day.

cheers

andrew