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From: Murray Eisenberg <murray AT math DOT umass DOT edu>
Subject:  Re: Installing snapshots (Was Re: Segment fault/Bus error with Singular)
Date:  Wed, 11 Jan 2006 12:58:37 -0500
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YES, your proposed rewrite makes it completely clear now!  Thank you.

(I hate bottom-posting -- since with it I have to read through the 
entire past history of the interchanges before getting to the most 
recent part -- and therefore always do top-posting.  Obviously your 
preference is the opposite.)

Igor Peshansky wrote:
> Ugh, top-posting...  Reformatted.
> 
> On Wed, 11 Jan 2006, Murray Eisenberg wrote:
> 
> 
>>Larry Hall (Cygwin) wrote:
>>
>>>Reformatted top-post...
>>>
>>>Murray Eisenberg wrote:
>>>
>>>
>>>>Larry Hall (Cygwin) wrote:
>>>>
>>>>
>>>>>Murray Eisenberg wrote:
>>>>>
>>>>>
>>>>>>I'm running latest Cygwin under Windows XP Pro (SP2, with all
>>>>>>updates).  I installed all the Singular packages via Cygwin
>>>>>>Setup.
>>>>>>
>>>>>>After I start cygwin with its bash shell, command
>>>>>>
>>>>>>  Singular
>>>>>>
>>>>>>gives error:
>>>>>>
>>>>>>  Singular " signal 11 (v: 3001/2005111410):
>>>>>>  Segment fault/Bus error occurred (r:1136744764)
>>>>>>  Please inform the authors
>>>>>>  trying to restart...
>>>>>>
>>>>>>(The number after "r:" changes depending on what else is running
>>>>>>in windows.)  But Cygwin never recovers, and it freezes.
>>>>>
>>>>>Does a recent snapshot make a difference?
>>>>><http://cygwin.com/snapshots/>
>>>>
>>>>Thanks for your reply that suggests to try a recent snapshot.
>>>>
>>>>I see nothing on the snapshots page (to which the URL you supplied
>>>>points) about how to use these files.
> 
> 
> Heh, I was sure there were instructions on that page.  I guess adding a
> link to the FAQ wouldn't hurt.
> 
> 
>>>See the FAQ entry:
>>><http://cygwin.com/faq/faq-nochunks.html#faq.setup.snapshots>
>>>This has the proper steps to follow to install a snapshot.
>>
>>Unfortunately, the instructions in FAQ # 2.15 "How do I install
>>snapshots?" is not completely clear.  It says that one should first
>>close all Cygwin applications and shells.  But then it says to "run" a
>>sequence of commands:
>>
>>  cd /
>>  tar .......
>>  cd /tmp
>>  tar ......
>>
>>Now given that I was supposed to exit Cygwin, presumably these commands
>>are to be run from a Windows command prompt.
>>
>>But then to what does root directory "/" refer?  To the Cygwin root? And
>>if so, where should I have put the downloaded
>>cygwin-inst-YYMMDD.tar.bz2?  And if "/" does not refer to the Cygwin
>>root, to what does it refer?
>>
>>If the commands are to be run within Cygwin, on the other hand, then
>>that would seem to contradict the first instruction, namely, to close
>>all Cygwin applications and shells.
> 
> 
> The FAQ is indeed confusing.  Perhaps the following wording would be
> better (if it is, I'll submit a patch to the FAQ):
> 
> ------------------------------------------------------------------------------
> First, are you sure you want to do this?  Snapshots are risky.  They have
> not been tested.  Use them only if there is a feature or bugfix that you
> need to try, and you are willing to deal with any problems, or at the
> request of a Cygwin developer.
> 
> You should generally install the full cygwin-inst-YYYYMMDD.tar.bz2 update,
> rather than just the DLL, otherwise some components may be out of sync.
> 
> You cannot use Setup to install a snapshot.
> 
> First, you will need to download the snapshot from the
> <a href="http://cygwin.com/snapshots/">snapshots page</a>.  Note the
> directory where you saved the snapshot tarball.
> 
> Before installing a snapshot, you must first Close all Cygwin
> applications, including shells and services (e.g. inetd, sshd).  You will
> not be able to replace cygwin1.dll if any Cygwin process is running. You
> may have to restart Windows to clear the DLL from memory (beware of
> automatic service startup).
> 
> Most of the downloaded snapshot can be installed using tar.  Cygwin tar
> won't be able to update /usr/bin/cygwin1.dll (because it's used by tar
> itself), but it should succeed with everything else.  If you are only
> installing the DLL snapshot, skip the first tar command.  Open a bash
> shell (it should be the only running Cygwin process) and issue the
> following commands:
> 
> 	/bin/tar -C/ -jxvf /posix/path/to/cygwin-inst-YYYYMMDD.tar.bz2 --exclude=usr/bin/cygwin1.dll
> 	/bin/tar -C/tmp -jxvf /posix/path/to/cygwin-inst-YYYYMMDD.tar.bz2 usr/bin/cygwin1.dll
> 	/bin/mv /bin/cygwin1.dll /bin/cygwin1-prev.dll
> 
> Note that after the "mv" command you will not be able to run any Cygwin
> programs.  Exit the bash shell, and use Explorer or the Windows command
> shell to move C:\cygwin\tmp\usr\bin\cygwin1.dll to
> C:\cygwin\bin\cygwin1.dll (assuming you installed Cygwin in C:\cygwin).
> 
> The operative word in trying the snapshots is "trying".  If you notice a
> problem with the snapshot that was not present in the release DLL (what we
> call a "regression"), please
> <a href="http://cygwin.com/problems.html">report</a> it to the Cygwin
> mailing list.  If you wish to go back to the older version of the DLL,
> again, close all Cygwin processes, delete C:\cygwin\bin\cygwin1.dll, and
> rename C:\cygwin\bin\cygwin1-prev.dll to C:\cygwin\bin\cygwin1.dll (again
> assuming that your "/" is C:\cygwin).  To restore the rest of the snapshot
> files, reinstall the "cygwin" package using Setup.
> ------------------------------------------------------------------------------
> 
> Comments?
> 	Igor


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