path: root/doc/src/sgml/cvs.sgml

<!--
$Header: /cvsroot/pgsql/doc/src/sgml/cvs.sgml,v 1.4 1999/04/06 15:38:10 thomas Exp $
CVS code repository
Thomas Lockhart

$Log: cvs.sgml,v $
Revision 1.4  1999/04/06 15:38:10  thomas
Start indenting markup. No text changes.

Revision 1.3  1999/03/30 15:25:56  thomas
Fix up small markup problems. Force omit-tags to nil so we have tag
 completion as required by the newest DocBook conventions.

Revision 1.2  1999/01/07 03:00:43  thomas
Put in more markup. Not done yet though.

Revision 1.1  1998/12/18 16:08:19  thomas
Information on the CVS tree and remote access.
Not yet complete, integrated, or marked up.
Not yet included in a document (should go in the developer's doc?).

-->

<appendix label="A" id="cvs">
<docinfo>
<authorgroup>
<author>
<firstname>Marc</firstname>
<surname>Fournier</surname>
</author>
</authorgroup>
<date>1998-12-01</date>
</docinfo>

 <title>The <productname>Postgres</productname> <productname>CVS</productname> Repository</title>

 <para>
  The <productname>Postgres</productname> source code is stored and managed using the
  <productname>CVS</productname> code management system.
 </para>

 At least two options,
 anonymous CVS and <productname>CVSup</productname>, 
 are available to pull the <productname>CVS</productname> code tree from the 
 <productname>Postgres</productname> server to your local machine.
</para>

 <sect1>
  <title><productname>CVS</productname> Tree Organization</title>

  <para>
   <note>
    <title>Author</title>
    <para>
     Written by <ulink url="mailto:scrappy@hub.org">Marc G. Fournier</ulink> on 1998-11-05.
   </note>
  </para>

<para>
   The command <command>cvs checkout</command> has a flag, <option>-r</option>,
 that lets you check out a
certain revision of a module.  This flag makes it easy to, for example,
retrieve the
sources that make up release 1.0 of the module `tc' at any time in the
future:

<programlisting>
$ cvs checkout -r REL6_4 tc
</programlisting>

This is useful, for instance, if someone claims that there is a bug in
that release, but you cannot find the bug in the current working copy.

<tip>
<para>
   You can also check out a module as it was at any given date using the
<option>-D</option> option.
</tip>
</para>

<para>
   When you tag more than one file with the same tag you can think
about the tag as "a curve drawn through a matrix of filename vs.
revision number".  Say we have 5 files with the following revisions:

<programlisting>
             file1   file2   file3   file4   file5
     
             1.1     1.1     1.1     1.1  /--1.1*      <-*-  TAG
             1.2*-   1.2     1.2    -1.2*-
             1.3  \- 1.3*-   1.3   / 1.3
             1.4          \  1.4  /  1.4
                           \-1.5*-   1.5
                             1.6
</programlisting>

then the tag <quote><literal>TAG</literal></quote> will reference
file1-1.2, file2-1.3, etc.

<note>
<para>
For creating a release branch, other then a
-b option added to the command, it's the same thing.
</note>
</para>

<para>
So, to create the v6.4 release
I will be doing the following:

<programlisting>
$ cd pgsql
$ cvs tag -b REL6_4
</programlisting>

which will create the tag and the branch for the RELEASE tree.
</para>

<para>
Now, for those with <productname>CVS</productname> access, it's too simple.
First, create two subdirectories, RELEASE and CURRENT, so that you don't
mix up the two.  Then do:

<programlisting>
cd RELEASE
cvs checkout -P -r REL6_4 pgsql
cd ../CURRENT
cvs checkout -P pgsql
</programlisting>

which results in two directory trees, <filename>RELEASE/pgsql</filename> and
<filename>CURRENT/pgsql</filename>. From that point on, <productname>CVS</productname>
will keep track of which repository branch is in which directory tree, and will
allow independent updates of either tree.
</para>

<para>
If you are <emphasis>only</emphasis> working on the <literal>CURRENT</literal>
 source tree, you just do
everything as before we started tagging release branches.
</para>

<para>
After you've done the initial checkout on a branch

<programlisting>
$ cvs checkout -r REL6_4
</programlisting>

anything you do within that directory structure is restricted to that
branch.  If you apply a patch to that directory structure and do a

<programlisting>
cvs commit
</programlisting>
 while inside of it, the patch is applied to the branch and
<emphasis>only</emphasis> the branch.
</para>
</sect1>

<sect1>
<title>Getting The Source Via Anonymous <productname>CVS</productname></title>

<para>
If you would like to keep up with the current sources on a regular
basis, you can fetch them from our <productname>CVS</productname> server 
and then use <productname>CVS</productname> to
retrieve updates from time to time.
</para>

<procedure>
<title>Anonymous CVS</title>

<step>
<para>
You will need a local copy of <productname>CVS</productname> (Concurrent Version Control
System), which you can get from
<ulink url="http://www.cyclic.com/">http://www.cyclic.com/</ulink> or
any GNU software archive site.  
We currently recommend version 1.10 (the most recent at the time of writing).
</para>
</step>

<step>
<para>
Do an initial login to the <productname>CVS</productname> server:
<programlisting>
cvs -d :pserver:anoncvs@postgresql.org:/usr/local/cvsroot login
</programlisting>
You will be prompted for a password; enter '<literal>postgresql</literal>'.
You should only need to do this once, since the password will be
saved in <literal>.cvspass</literal> in your home directory.
</para>
</step>

<step>
<para>
Fetch the <productname>Postgres</productname> sources:
<programlisting>
cvs -z3 -d :pserver:anoncvs@postgresql.org:/usr/local/cvsroot co -P pgsql
</programlisting>
which installs the <productname>Postgres</productname> sources into a 
subdirectory <filename>pgsql</filename>
of the directory you are currently in.

<note>
<para>
If you have a fast link to the Internet, you may not need <option>-z3</option>,
which instructs <productname>CVS</productname> to use gzip compression for transferred data.  But
on a modem-speed link, it's a very substantial win.
</para>
</note>

<para>
This initial checkout is a little slower than simply downloading
a <filename>tar.gz</filename> file; expect it to take 40 minutes or so if you
have a 28.8K modem.  The advantage of <productname>CVS</productname> doesn't show up until you
want to update the file set later on.
</para>
</step>

<step>
<para>
Whenever you want to update to the latest <productname>CVS</productname> sources,
<command>cd</command> into
the <filename>pgsql</filename> subdirectory, and issue
<programlisting>
cvs -z3 update -d -P
</programlisting>
This will fetch only the changes since the last time you updated.
You can update in just a couple of minutes, typically, even over
a modem-speed line.
</para>
</step>

<step>
<para>
You can save yourself some typing by making a file <filename>.cvsrc</filename>
in your home directory that contains

<programlisting>
cvs -z3
update -d -P
</programlisting>

This supplies the <option>-z3</option> option to all cvs commands, and the
<option>-d</option> and <option>-P</option> options to cvs update.  Then you just have
to say
<programlisting>
cvs update
</programlisting>
to update your files.
</para>
</step>
</procedure>

<para>
<caution>
Some older versions of <productname>CVS</productname> have a bug that
causes all checked-out files to be stored world-writable in your
directory.  If you see that this has happened, you can do something like
<programlisting>
chmod -R go-w pgsql
</programlisting>
to set the permissions properly.
This bug is fixed as of <productname>CVS</productname> version 1.9.28.
</caution>
</para>

<para>
<productname>CVS</productname> can do a lot of other things, such as fetching prior revisions
of the <productname>Postgres</productname> sources rather than the latest development version.
For more info consult the manual that comes with <productname>CVS</productname>, or see the online
documentation at <ulink url="http://www.cyclic.com/">http://www.cyclic.com/</ulink>.
</para>

</sect1>

<sect1>
<title>Getting The Source Via <productname>CVSup</productname></title>

<para>
An alternative to using anonymous CVS for retrieving 
the <productname>Postgres</productname> source tree
is <productname>CVSup</productname>. The major advantage to using
<productname>CVSup</productname> is that it can reliably
replicate the <emphasis>entire</emphasis> CVS repository on your local system,
allowing fast local access to cvs operations such as <option>log</option>
and <option>diff</option>. Other advantages include fast synchronization to
the <productname>Postgres</productname> server due to an efficient
streaming transfer protocol which only sends the changes since the last update.
</para>

<procedure>
<title>Installation from Binaries</title>

<para>
Instructions for installing <productname>CVSup</productname> from sources
are in a subsequent section. You can instead use pre-built binaries
if you have a platform for which binaries
are posted on 
<ulink url="ftp://postgresql.org/pub">the <productname>Postgres</productname> ftp site</ulink>,
or if you are running FreeBSD, for which <productname>CVSup</productname> is available
as a port.
</para>

<step>
<para>
Retrieve the binary tar file appropriate for your platform.

<substeps>
<step performance="optional">
<para>
If you are running FreeBSD, install the <productname>CVSup</productname> port.
</para>
</step>

<step performance="optional">
<para>
If you have another platform, check for and download the appropriate binary from
<ulink url="ftp://postgresql.org/pub">the <productname>Postgres</productname> ftp site</ulink>,
</para>
</step>
</substeps>
</para>

<step>
<para>
</para>

</procedure>

<sect2>
<title>Installation from Binaries</title>

<para>
Instructions for installing <productname>CVSup</productname> from sources
are in a subsequent section. If you have a platform for which static binaries
are posted on 
<ulink url="ftp://postgresql.org/pub">the <productname>Postgres</productname> ftp site</ulink>.
</para>

<sect2>
<title>Client Configuration</title>

<para>
</para>

<sect2>
<title>Background</title>

<para>
<note>
<title>Author</title>
<para>
Written by <ulink url="mailto:jdp@polstra.com">John Polstra</ulink>, the
<productname>CVSup</productname> author.
</note>

Before you dismiss CVSup because of the language it's written in,
I hope you'll take a look at the long list of platforms supported
by the free DEC SRC Modula-3 compiler, at:

    http://www.research.digital.com/SRC/modula-3/html/platforms.html

I developed CVSup using that compiler, under FreeBSD.  I also have
reports from people who are using CVSup under Linux, Solaris, and
ALPHA/OSF.  It should be easily portable to any of the POSIX systems
supported by the compiler.

I understand your reluctance to "change a winning team," but once
you've seen the speed increase of CVSup relative to sup, you'll no
longer view sup as "winning."  Sup was the inspiration for me to
develop CVSup, precisely because it performs so badly in certain
situations.

Sup's synchronous request-ack communication pattern is death on a
high-latency network link.  CVSup uses a streaming protocol that is
immune to latency problems.  Its multi-threaded implementation
utilizes the network link in both directions simultaneously, at or
near its capacity.

If you are mirroring a CVS repository and add a tag to each file
(say, to make an official release), sup will send a fresh copy of
every file in the repository.  CVSup sends only the tags, and edits
them into the files on the client host.  It was just such a tagging
operation, and the attendent utter saturation of their server's
network link, that led the FreeBSD project to abandon sup in favor
of CVSup.  If you ask on <FreeBSD-hackers@FreeBSD.ORG>, I'm sure
you'll get some opinions on whether CVSup is worth its Modula-3
hassle factor.

It's freeware.  I don't get anything besides warm fuzzy feelings
when people use it.  But I'd hate to see you rule it out simply
because of the language it's written in.

If I can answer any questions about CVSup or Modula-3, feel free
to contact me.

Best regards,
John Polstra
--
   John Polstra                                       jdp@polstra.com
   John D. Polstra & Co., Inc.                Seattle, Washington USA
   "Self-knowledge is always bad news."                 -- John Barth



<sect2>
<title>Installing <productname>CVSup</productname></title>

<para>
Binary files of <productname>CVSup</productname> client executables compiled
for several platforms are posted on
<ulink url="ftp://postgresql.org/pub/CVSup">the PostgreSQL ftp site</ulink>.
In many cases, these binary files will be sufficient to get started with
<productname>CVSup</productname>.
</para>

<para>
Alternatively, you can install <productname>CVSup</productname> from
a FreeBSD package or from source. A clean installation from source code
requires installation of a <productname>Modula-3</productname> compiler,
which is also available as Linux <productname>RPM</productname>,
 FreeBSD package, or source code.

<note>
<para>
A clean-source installation of Modula-3 takes roughly 200MB of disk space,
which shrinks to roughly 50MB of space when the sources are removed.
</note>
</para>

<sect3>
<title>Linux installation</title>

<para>
For a <productname>CVSup</productname> client, pick up the appropriate tarball
from <ulink url="ftp://postgresql.org/pub/CVSup">the PostgreSQL ftp site</ulink>.
Unpack the tarball into <filename>/usr/local/bin</filename>, then move the man page
file <filename>cvsup.1</filename> to <filename>/usr/local/man/man1</filename>.
</para>

<para>
To build <productname>CVSup</productname> from local sources,
 pick up the <productname>Modula-3</productname>
distribution from
<ulink url="http://m3.polymtl.ca/m3">Polytechnique Montr�al</ulink>,
 who are actively maintaining the code base originally developed by 
<ulink url="http://www.research.digital.com/SRC/modula-3/html/home.html">the DEC Systems Research Center</ulink>.
The <quote>PM3</quote> <productname>RPM</productname> distribution is roughly
30MB compressed.
</para>

From - Tue Dec  1 14:01:42 1998
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Message-Id: <199707211844.LAA00444@austin.polstra.com>
To: "Thomas G. Lockhart" <Thomas.G.Lockhart@jpl.nasa.gov>
Subject: Re: [HACKERS] Re: CVSup is in Modula-3 
In-Reply-To: Your message of "Mon, 21 Jul 1997 16:31:17 -0000."
             <33D38ED5.132C8923@jpl.nasa.gov> 
References: <199705210339.UAA13067@austin.polstra.com> 
	<33D38ED5.132C8923@jpl.nasa.gov> 
Date: Mon, 21 Jul 1997 11:44:47 -0700
From: John Polstra <jdp@polstra.com>
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Tom,

> We are starting to try to set up CVSup to support the PostgreSQL
> project.

Great!  If I can help, just let me know.

> After being delayed while buying more disk to install Modula-3,

:-}

> I started back up on trying the installation. I have gotten the
> CVSup source distribution cvsup-15.1.tar.gz from www.cdrom.com and
> have m3 on my system, which already had zlib.
> 
> There appears to be more needed on my RedHat Linux box; make fails
> with a syntax error on the last line of the Makefile which is
> 
> .include <bsd.subdir.mk>
> 
> I assume this is a FreeBSDism

Yes, sorry, the Makefiles aren't portable yet.  It's easy to build
it by hand though.  Chdir into each of the following directories in
the given order, and in each one type "m3build":

    suptcp
    suplib
    server
    client

If all goes well, the executables will get created in the
subdirectories "server/LINUXELF" and "client/LINUXELF".

If you run into any portability problems, please let me know and
I'll try to send you patches right away.  It's the only way I know
of to improve the portability of the package.

John

From - Tue Dec  1 14:02:37 1998
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To: "Thomas G. Lockhart" <Thomas.G.Lockhart@jpl.nasa.gov>
Subject: Re: [HACKERS] Re: CVSup is in Modula-3 
In-Reply-To: Your message of "Tue, 22 Jul 1997 04:55:24 -0000."
             <33D43D3C.65F75F5@jpl.nasa.gov> 
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	<33D43D3C.65F75F5@jpl.nasa.gov> 
Date: Mon, 21 Jul 1997 22:22:40 -0700
From: John Polstra <jdp@polstra.com>
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> It became clear that I had a problem with my m3 installation; some
> X11 libraries were not being found correctly.

By the way, you can build the client without the GUI by doing this
in the "client" subdirectory:

    m3build -DNOGUI

If you build it that way, then it doesn't need the X11 libraries and
it's quite a bit smaller.  The GUI is fun to watch, but it's not
very useful.  I originally implemented it because it made debugging
the multi-threaded client program much easier.

To build a statically-linked client, edit <filename>client/src/m3makefile</filename>
to add <literal>build_standalone()</literal>
 just before the <literal>program()</literal> entry near
the end of the file:

<programlisting>
build_standalone()
program(cvsup)
</programlisting>

Then, if cvsup has already been built, remove the machine-specific build directory
(e.g. <filename>LINUXELF/</filename>) and rebuild:

<programlisting>
rm -rf LINUXELF
m3build -DNOGUI -v
cp -p LINUXELF/cvsup /usr/local/bin
</programlisting>

> Anyway, with the reinstall and the two-line patch above (and that
> one include-file _POSIX_SOURCE workaround from the previous try),
> things built cleanly.

Good!

> Now I just need a server somewhere to test.

If you want to try it out, there are public servers for the FreeBSD
source repository at cvsup.freebsd.org and cvsup2.freebsd.org.
Here's a suggested supfile:

*default host=cvsup.freebsd.org compress
*default release=cvs
*default base=/home/jdp/cvsup-test	# FIX THIS
*default delete use-rel-suffix
# *default tag=.
src-bin

This will fetch you the source repository for the programs that get
installed into "/bin".  I chose it because it's one of the smaller
pieces of the system.  Make an empty directory someplace for
testing, and change the "FIX THIS" line to specify that directory
after the "base=".

If you are on a T1 or better, you should probably delete the
"compress" keyword in the first line.

As shown, it will get the repository (RCS) files.  If you uncomment
the line containing "tag=." then it will instead check out the
latest version of each file.  There's a bunch more information about
what you can do at <http://www.freebsd.org/handbook/cvsup.html>.

There is one other thing I want to send you, but not tonight.  I
discovered the hard way that you need a malloc package that is
thread-safe with respect to the Modula-3 threads package.  The
Modula-3 runtime takes care to do the proper mutual exclusion around
all calls it makes to malloc.  But if you call certain functions in
the native C library which in turn call malloc, then the mutual
exclusion gets bypassed.  This can lead to rare but baffling core
dumps.

For FreeBSD, I solved this by adding a thread-safe malloc package
into the Modula-3 runtime.  The package is quite portable, and I'm
sure it will work well for Linux with very few changes (probably
none at all).  I want to send it to you along with instructions
for making it a part of the "libm3core" library.  It's very simple,
but I've run out of steam for tonight. :-)  Once you have this
malloc in place, the CVSup system should be rock solid.  We have
servers that have been up for weeks and have served many thousands
of clients without any observed problems.

> We hope to have the Postgres tree using CVSup within a month or
> so, and hope to retire sup in September...

Great!  I'll do my best to help make sure you don't regret it.

John




From - Tue Dec  1 14:03:48 1998
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Date: Mon, 28 Jul 1997 18:08:30 GMT
From: Thomas Lockhart <Thomas.G.Lockhart@jpl.nasa.gov>
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Subject: Thread safe malloc for Modula-3
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------------- Begin Forwarded Message -------------

>From jdp@austin.polstra.com  Sat Jul 26 03:42:04 1997
To: "Thomas G. Lockhart" <Thomas.G.Lockhart@jpl.nasa.gov>
Subject: Thread safe malloc for Modula-3
Date: Fri, 25 Jul 1997 20:41:41 -0700
From: John Polstra <jdp@polstra.com>
Content-Length: 26878

Tom,

I'm appending the sources for the thread safe version of malloc that
I told you about.  I believe that it will simply compile and work
under Linux, but I've never had an opportunity to test it there.
I urge you to put it into your Modula-3 system -- otherwise, you
are guaranteed to get occasional mysterious core dumps from cvsupd.

As a first step, I'd suggest simply trying to compile it under
Linux, like this:

    cc -O -c malloc.c

You shouldn't get any errors or warnings.  If you do, contact me
before you waste any more time on it.

Assuming it compiles OK, copy malloc.c into this directory of your
Modula-3 source tree:

    m3/m3core/src/runtime/LINUXELF

In that same directory, edit "m3makefile" and add this line to the
end of the file:

    c_source       ("malloc")

Then chdir up into "m3/m3core" of the Modula-3 tree and type
"m3build".  (I'm assuming you already have a working Modula-3
installation.)  After that finishes, become root and type "m3ship"
to install it.

That's all there is to it.  If you built cvsup and cvsupd to use
shared libraries, you don't even need to re-link them.  They'll pick
up the change automatically from the updated shared library.

Let me know if you run into any problems with it.

By the way, this is a very good malloc in its own right.  It's worth
using even aside from the thread safety of it.

Regards,
John



From - Tue Dec  1 14:04:30 1998
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From: "Thomas G. Lockhart" <lockhart@alumni.caltech.edu>
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I've deposited a statically built cvsup client executable (and man pages
and test configuration) in 

  /pub/incoming/cvsup-15.1-client-linux.tar.gz

This was built and linked on Linux/v2.0.30, RH/v4.2, gnulib/v5.3.12 and
includes the thread-safe malloc provided by John Polstra. I'll forward
to you the malloc code and an additional installation e-mail from John.

The Modula-3 installation takes a good bit of room (~50MB?) and the
build environment is unique to Modula-3, but suprisingly enough it
pretty much works.

The cvsup Makefiles do not work on my machine (they are not portable
yet) but each major package (there are 4) can be built without needing
the makefiles with two commands each. Not difficult at all. John gives
some hints in his e-mail on how to build a static executable, and on how
to shrink the size of the executable by leaving out the GUI support.
Again, easy to do. 

My client test case, picking up a sub-tree of the FreeBSD distribution,
worked flawlessly. I haven't tried running a server.

Thanks to John for getting me going.

			- Tom


From - Tue Dec  1 14:07:28 1998
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For the thread-safe malloc, do the following:
1) install Modula-3
2) add the enclosed file "malloc.c" to m3/m3core/src/runtime/LINUXELF
3) edit the last line of m3makefile in the same directory to add
     c_source       ("malloc")
4) do an "m3build" and an m3ship from the appropriate directory.

>From what John said, the malloc problem can be noticable for the
server-side running cvsupd. Clients may not need it.

Unfortunately I seem to have lost John's original good instructions for
this, so am doing this from memory. May need to ask John to give
instructions again...

			- Tom

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To: "Thomas G. Lockhart" <Thomas.G.Lockhart@jpl.nasa.gov>
Subject: Re: [HACKERS] Re: CVSup is in Modula-3 
In-Reply-To: Your message of "Mon, 21 Jul 1997 16:31:17 -0000."
             <33D38ED5.132C8923@jpl.nasa.gov> 
References: <199705210339.UAA13067@austin.polstra.com> 
	<33D38ED5.132C8923@jpl.nasa.gov> 
Date: Mon, 21 Jul 1997 11:44:47 -0700
From: John Polstra <jdp@polstra.com>

Tom,

> We are starting to try to set up CVSup to support the PostgreSQL
> project.

Great!  If I can help, just let me know.

> After being delayed while buying more disk to install Modula-3,

:-}

> I started back up on trying the installation. I have gotten the
> CVSup source distribution cvsup-15.1.tar.gz from www.cdrom.com and
> have m3 on my system, which already had zlib.
> 
> There appears to be more needed on my RedHat Linux box; make fails
> with a syntax error on the last line of the Makefile which is
> 
> .include <bsd.subdir.mk>
> 
> I assume this is a FreeBSDism

Yes, sorry, the Makefiles aren't portable yet.  It's easy to build
it by hand though.  Chdir into each of the following directories in
the given order, and in each one type "m3build":

    suptcp
    suplib
    server
    client

If all goes well, the executables will get created in the
subdirectories "server/LINUXELF" and "client/LINUXELF".

If you run into any portability problems, please let me know and
I'll try to send you patches right away.  It's the only way I know
of to improve the portability of the package.

John




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To: "Thomas G. Lockhart" <Thomas.G.Lockhart@jpl.nasa.gov>
Subject: Re: [HACKERS] Re: CVSup is in Modula-3 
In-Reply-To: Your message of "Tue, 22 Jul 1997 01:16:41 -0000."
             <33D409F9.5FEF02C7@jpl.nasa.gov> 
References: <199705210339.UAA13067@austin.polstra.com> <33D38ED5.132C8923@jpl.nasa.gov> <199707211844.LAA00444@austin.polstra.com> 
	<33D409F9.5FEF02C7@jpl.nasa.gov> 
Date: Mon, 21 Jul 1997 18:31:05 -0700
From: John Polstra <jdp@polstra.com>

> >     suplib
> 
> Changed fnmatch.h to subvert the #ifndef _POSIX_SOURCE, since
> FNM_LEADING_DIR and the others are not apparently defined on my RedHat
> Linux/v4.2 system.

OK, I'll check that and try to make it more portable.

> new source -> compiling ../src/FileAttr.m3
> "../src/FileAttr.m3", line 609: LOOPHOLE: expression's size differs from
> type's
> "../src/FileAttr.m3", line 610: LOOPHOLE: expression's size differs from
> type's

I'll have to think about the best way to make that portable.  For
now, edit "suplib/src/FileAttr.m3".  In each of lines 609 and 610,
change the "-1" to "65535".  That should allow you to proceed.

I'm 99% sure that all the subsequent error messages were caused by
the failure of this file to compile.  It just might work after this
... :-)

BTW, it has been used by several people under Linux.  But
FileAttr.m3 is a new file for this release, so it hasn't had the
portability bugs ironed out yet.

Regards,
John


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To: "Thomas G. Lockhart" <Thomas.G.Lockhart@jpl.nasa.gov>
Subject: Re: [HACKERS] Re: CVSup is in Modula-3 
In-Reply-To: Your message of "Tue, 22 Jul 1997 01:16:41 -0000."
             <33D409F9.5FEF02C7@jpl.nasa.gov> 
References: <199705210339.UAA13067@austin.polstra.com> <33D38ED5.132C8923@jpl.nasa.gov> <199707211844.LAA00444@austin.polstra.com> 
	<33D409F9.5FEF02C7@jpl.nasa.gov> 
Date: Mon, 21 Jul 1997 18:56:57 -0700
From: John Polstra <jdp@polstra.com>

Erk.  I just realized during dinner that the fix I sent you for
FileAttr.m3 probably won't work either.  You'll probably get exactly
the same error messages as before.

Instead of what I told you before, just change those two lines to
this:

        owner := 65535;
        group := 65535;

I hope I caught you before you wasted too much time on it.

John


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To: "Thomas G. Lockhart" <Thomas.G.Lockhart@jpl.nasa.gov>
Subject: Re: [HACKERS] Re: CVSup is in Modula-3 
In-Reply-To: Your message of "Tue, 22 Jul 1997 04:55:24 -0000."
             <33D43D3C.65F75F5@jpl.nasa.gov> 
References: <199705210339.UAA13067@austin.polstra.com> <33D38ED5.132C8923@jpl.nasa.gov> <199707211844.LAA00444@austin.polstra.com> <33D409F9.5FEF02C7@jpl.nasa.gov> <199707220156.SAA03432@austin.polstra.com> 
	<33D43D3C.65F75F5@jpl.nasa.gov> 
Date: Mon, 21 Jul 1997 22:22:40 -0700
From: John Polstra <jdp@polstra.com>

> It became clear that I had a problem with my m3 installation; some
> X11 libraries were not being found correctly.

By the way, you can build the client without the GUI by doing this
in the "client" subdirectory:

    m3build -DNOGUI

If you build it that way, then it doesn't need the X11 libraries and
it's quite a bit smaller.  The GUI is fun to watch, but it's not
very useful.  I originally implemented it because it made debugging
the multi-threaded client program much easier.

> Anyway, with the reinstall and the two-line patch above (and that
> one include-file _POSIX_SOURCE workaround from the previous try),
> things built cleanly.

Good!

> Now I just need a server somewhere to test.

If you want to try it out, there are public servers for the FreeBSD
source repository at cvsup.freebsd.org and cvsup2.freebsd.org.
Here's a suggested supfile:

*default host=cvsup.freebsd.org compress
*default release=cvs
*default base=/home/jdp/cvsup-test	# FIX THIS
*default delete use-rel-suffix
# *default tag=.
src-bin

This will fetch you the source repository for the programs that get
installed into "/bin".  I chose it because it's one of the smaller
pieces of the system.  Make an empty directory someplace for
testing, and change the "FIX THIS" line to specify that directory
after the "base=".

If you are on a T1 or better, you should probably delete the
"compress" keyword in the first line.

As shown, it will get the repository (RCS) files.  If you uncomment
the line containing "tag=." then it will instead check out the
latest version of each file.  There's a bunch more information about
what you can do at <http://www.freebsd.org/handbook/cvsup.html>.

There is one other thing I want to send you, but not tonight.  I
discovered the hard way that you need a malloc package that is
thread-safe with respect to the Modula-3 threads package.  The
Modula-3 runtime takes care to do the proper mutual exclusion around
all calls it makes to malloc.  But if you call certain functions in
the native C library which in turn call malloc, then the mutual
exclusion gets bypassed.  This can lead to rare but baffling core
dumps.

For FreeBSD, I solved this by adding a thread-safe malloc package
into the Modula-3 runtime.  The package is quite portable, and I'm
sure it will work well for Linux with very few changes (probably
none at all).  I want to send it to you along with instructions
for making it a part of the "libm3core" library.  It's very simple,
but I've run out of steam for tonight. :-)  Once you have this
malloc in place, the CVSup system should be rock solid.  We have
servers that have been up for weeks and have served many thousands
of clients without any observed problems.

> We hope to have the Postgres tree using CVSup within a month or
> so, and hope to retire sup in September...

Great!  I'll do my best to help make sure you don't regret it.

John





From - Tue Dec  1 14:09:25 1998
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From: The Hermit Hacker <scrappy@hub.org>
To: pgsql-hackers@postgresql.org
Subject: [HACKERS] CVSup ready for prime time...
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Wow...after several hours of playing with this, I believe I've finally
got the last kink worked out (thanks to John)...

The following is the CVSup config file that I'm using to grab the current
distribution...if anyone can find anything wrong with it, please let me
know:

===================
# This file represents the standard CVSup distribution file
# for the PostgreSQL ORDBMS project
#
# Defaults that apply to all the collections
*default host=postgresql.org
*default compress
*default release=cvs
*default delete use-rel-suffix
*default tag=.

# base directory points to where CVSup will store its 'bookmarks' file(s)
*default base=/usr/local/pgsql

# prefix directory points to where CVSup will store the actual distribution(s)
*default prefix=/usr/local/pgsql

# complete distribution, including all below
pgsql

# individual distributions vs 'the whole thing'
# pgsql-doc  
# pgsql-perl5
# pgsql-src
===================

This file is also available at:

	ftp.postgresql.org/pub/CVSup/README.cvsup

Marc G. Fournier                                
Systems Administrator @ hub.org 
primary: scrappy@hub.org           secondary: scrappy@{freebsd|postgresql}.org 




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