I untarred a recent GHC repo tar-ball, and pulled from the HEAD.

Then I modified docs/users_guide/bugs.xml.

But darcs what says there's a second file that is modified (see below)

I did 'darcs revert' to fix this, but it's unsettling, so I'm reporting it.  I've seen it before quite often.

This is darcs 2.0 on Linux

Simon

bash-3.2$ darcs what -s
R ./distrib/MacOS/installer-docs/lambda-logo.png
M ./docs/users_guide/bugs.xml -1 +15
bash-3.2$

Hi Simon,

Is this one of the tarballs that's available on darcs.haskell.org ?

Thanks!

Yes. I believe it's
ghc-HEAD-2007-08-29-ghc-corelibs-testsuite.tar

SImon

| -----Original Message-----
| From: Eric Kow [mailto:bugs@darcs.net]
| Sent: 19 August 2008 13:40
| To: beschmi@cloaked.de; dagit@codersbase.com; eric.kow@gmail.com; Simon Peyton-Jones
| Subject: [issue1022] Un-needed revert
|
|
| Eric Kow <eric.kow@gmail.com> added the comment:
|
| Hi Simon,
|
| Is this one of the tarballs that's available on darcs.haskell.org ?
|
| Thanks!
|
| ----------
| priority:  -> bug
| status: unread -> chatting
|
| __________________________________
| Darcs bug tracker <bugs@darcs.net>
| <http://bugs.darcs.net/issue1022>
| __________________________________

I couldn't find the 2007-08-29 tarball.  There is one for 2008-08-17 and 2007-09-11.

I tried the 2008-08 one this morning on my Mac, managed to pull from head
without any local changes reported.

I need a volunteer to do the following

wget http://darcs.haskell.org/ghc-HEAD-2007-09-11-ghc-corelibs-testsuite.tar.bz2
tar xjf ${tarball}
cd ${untarred}
darcs pull
darcs whatsnew

Please report back with your findings.

I tried and got:

> Thorkil-Naurs-Computer:~/tn/test/darcs/Issue/1022/work thorkilnaur$ wget 
http://darcs.haskell.org/ghc-HEAD-2007-09-11-ghc-corelibs-testsuite.tar.bz2
> --16:59:55--  http://darcs.haskell.org/ghc-HEAD-2007-09-11-ghc-corelibs-
testsuite.tar.bz2
>            => `ghc-HEAD-2007-09-11-ghc-corelibs-testsuite.tar.bz2'
> Resolving darcs.haskell.org... 69.30.63.197
> Connecting to darcs.haskell.org|69.30.63.197|:80... connected.
> HTTP request sent, awaiting response... 404 Not Found
> 16:59:57 ERROR 404: Not Found.
>
> Thorkil-Naurs-Computer:~/tn/test/darcs/Issue/1022/work thorkilnaur$

There is a http://darcs.haskell.org/ghc-STABLE-2007-09-11-ghc-corelibs-
testsuite.tar.bz2 (STABLE rather than HEAD), is that the one you would like some 
findings for?

Best regards
Thorkil

> There is a http://darcs.haskell.org/ghc-STABLE-2007-09-11-ghc-corelibs-
> testsuite.tar.bz2 (STABLE rather than HEAD), is that the one you would like some 
> findings for?

I'm not sure; Simon mentioned HEAD 2007-08-29 which does not seem to be
available.

That said, yes, that is the one I meant.  Note that you'll probably want
to pull from a local copy of GHC instead of from the site.

Thanks!

Trying this on an Intel Mac OSX with

> thorkil-naurs-intel-mac-mini:~ thorkilnaur$ darcs --exact-version
> darcs compiled on Aug  7 2008, at 21:50:40
> # configured Mon Jun 23 18:19:52 PDT 2008
> ./configure /usr/local/share/config.site /usr/local/etc/config.site
> 
> Context:
> 
> [TAG 2.0.2
> David Roundy <droundy@darcs.net>**20080624012041] 

I downloaded and unpacked http://darcs.haskell.org/ghc-STABLE-2007-09-11-ghc-corelibs-testsuite.tar.bz2. 
After the darcs pull (Pulling from "http://darcs.haskell.org/ghc-6.8/ghc"...  This is the GHC darcs 
repository (ghc-6.8 branch)):

> thorkil-naurs-intel-mac-mini:~/tn/test/darcs/Issue/1022/work/unpack/ghc thorkilnaur$ darcs whatsnew
> No changes!

I tried to pull the GHC HEAD into this STABLE repository, both from http://darcs.haskell.org/ghc and from a 
local repository. In both cases, I interrupted the pull after it's having spent 100% CPU for more than an 
hour without apparent progress.

So this seems to be a dead end.

Right from the start, however, I had recognized the name of the file concerned (lambda-logo.png) and it 
turned out that I had run into a similar problem a while back, attempting to build the GHC HEAD on this 
FreeBSD machine:

> tn@tn21$ uname -a
> FreeBSD tn21.thorkilnaur.dk 5.4-RELEASE FreeBSD 5.4-RELEASE #0: Sun May  8 10:21:06 UTC 2005     
root@harlow.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  i386

Getting back to this (so far incomplete) attempt, I found:

> tn@tn21$ darcs --exact-version
> darcs compiled on May  3 2008, at 02:08:49
> # configured Sun Jun  3 18:53:47 EDT 2007
> ./configure 
> 
> Context:
> 
> [TAG 1.0.9
> Tommy Pettersson <ptp@lysator.liu.se>**20070603213706] 
> tn@tn21$ darcs whatsnew
> {
> move ./distrib/MacOS/installer-docs/lambda-logo.png ./distrib/MacOS/lambda-logo.png
> addfile ./distrib/MacOS/installer-docs/lambda-logo.png
> binary ./distrib/MacOS/installer-docs/lambda-logo.png
> binary ./distrib/MacOS/lambda-logo.png
> rmfile ./distrib/MacOS/lambda-logo.png
> }
> tn@tn21$ 

which is a bit like the problem reported by Simon PJ. I also found these patches, related to the concerned 
file:

> Tue Feb  5 06:20:17 CET 2008  Manuel M T Chakravarty <chak@cse.unsw.edu.au>
>   * Lambda logo for packages
>   - This image is in the public domain, cf
>      http://en.wikipedia.org/wiki/Image:Greek_lc_lamda_thin.svg
>     addfile ./distrib/MacOS/lambda-logo.png
>     binary ./distrib/MacOS/lambda-logo.png

And:

> Mon Feb 11 07:14:50 CET 2008  Manuel M T Chakravarty <chak@cse.unsw.edu.au>
>   * Mac installer: add comprehensive licencing information
>
>     adddir ./distrib/MacOS/installer-docs
>     move ./distrib/MacOS/lambda-logo.png ./distrib/MacOS/installer-docs/lambda-logo.png
>     addfile ./distrib/MacOS/installer-docs/license.html
>     hunk ./distrib/MacOS/GHC-system.pmdoc/index.xml 1
>     ...

I am unfortunately not 100% sure, but this repository was most likely created by starting with an archive 
ghc-HEAD-2007-12-16-ghc.tar.bz2 and pulling the GHC HEAD (as of 2008-May-03) into it.

I have tried to pull the present GHC HEAD into the repository created from this archive, but darcs whatsnew 
reports 'No changes'.

So: I have an existing repository with a problem similar to the one that Simon PJ had, but I have not been 
able to find a way to create such a repository.

Best regards
Thorkil

Sorry.  This is it
        http://darcs.haskell.org/ghc-HEAD-2007-08-29-ghc-corelibs-testsuite.tar.bz2

Simon

| -----Original Message-----
| From: Eric Kow [mailto:bugs@darcs.net]
| Sent: 23 August 2008 09:21
| To: beschmi@gmail.com; dagit@codersbase.com; darcs-devel@darcs.net; eric.kow@gmail.com; Simon Peyton-
| Jones
| Subject: [issue1022] Un-needed revert
|
|
| Eric Kow <eric.kow@gmail.com> added the comment:
|
| I couldn't find the 2007-08-29 tarball.  There is one for 2008-08-17 and 2007-09-11.
|
| I tried the 2008-08 one this morning on my Mac, managed to pull from head
| without any local changes reported.
|
| I need a volunteer to do the following
|
| wget http://darcs.haskell.org/ghc-HEAD-2007-09-11-ghc-corelibs-testsuite.tar.bz2
| tar xjf ${tarball}
| cd ${untarred}
| darcs pull
| darcs whatsnew
|
| Please report back with your findings.
|
| ----------
| nosy: +darcs-devel
| status: chatting -> need-volunteer
|
| __________________________________
| Darcs bug tracker <bugs@darcs.net>
| <http://bugs.darcs.net/issue1022>
| __________________________________

| I tried to pull the GHC HEAD into this STABLE repository, both from http://darcs.haskell.org/ghc and
| from a
| local repository. In both cases, I interrupted the pull after it's having spent 100% CPU for more than
| an
| hour without apparent progress.
|
| So this seems to be a dead end.

Not a dead end at all!  It's another darcs bug!  Having pull take 100% of the CPU for an hour is an absolute disaster when it comes to user confidence.  If you have a reproducible test case, I urge you to examine it.

Simon

> I need a volunteer to do the following
>
> wget http://darcs.haskell.org/ghc-HEAD-2007-09-11-ghc-corelibs-testsuite.tar.bz2
> tar xjf ${tarball}
> cd ${untarred}
> darcs pull
> darcs whatsnew
> 
> Please report back with your findings.

> Sorry.  This is it
>         http://darcs.haskell.org/ghc-HEAD-2007-08-29-ghc-corelibs-testsuite.tar.bz2

Following unpack of ghc-HEAD-2007-08-29-ghc-corelibs-testsuite.tar.bz2 and darcs pull, darcs whatsnew
reported "No changes!"

Best regards
Thorkil

Just summing up things so far: on a darcs 1 repository with darcs 2

we have been unable to reproduce the bug but Thorkil does have a repository
somewhere with similar behaviour.  There seems to be a common theme of binary
files in here somewhere.

This sounds like another pending bug, possibly one that has been fixed between
darcs 2.0 and now.

So I still need a volunteer to
 - obtain a copy of darcs 2.0.0
 - unpack
http://darcs.haskell.org/ghc-HEAD-2007-08-29-ghc-corelibs-testsuite.tar.bz2
 - obtain a copy of the real GHC head
 - darcs pull from the real HEAD into the tarball one using the old darcs 2

We've established that darcs 2.0.2 does not exhibit this behaviour, and if we
can reproduce it with darcs 2.0.0, I think it will be safe to assume that it has
since been fixed.

The earlier attempt (http://bugs.darcs.net/msg5740) used:

> thorkil-naurs-intel-mac-mini:~ thorkilnaur$ darcs --version
> 2.0.2 (release)

So i tried again, this time using:

> thorkil-naurs-mac-mini:~ thorkilnaur$ darcs --version
> 2.0.0 (unknown)

Unfortunately, after unpacking ghc-HEAD-2007-08-29-ghc-corelibs-testsuite.tar.bz2  and darcs pull, darcs whatsnew 
still reported "No changes!".

Best regards
Thorkil

Well, I guess this means we're stumped!  Thanks again for the testing.  I don't
know how to move forward anymore.

We need somebody to either
- find a way to reproduce this (is there something we're missing?)
- procure a minimal test case
- develop a theory explaining where this spurious whatsnew comes from

So we haven't been able to reproduce this, but we also know that since David has
fixed some pending patch bugs since Simon's report.

I think it's time to move on.  Thanks for the report, Simon!  Please get in
touch if something like this happens again.