Squid_ The Definitive Guide - Duane Wessels [13]
sh$ export CVSROOT
You then log in to the server:
% cvs login
(Logging in to anoncvs@cvs.squid-cache.org)
CVS password:
At the prompt, enter anoncvs for the password. Now you can check out the source tree with this command:
% cvs checkout -r SQUID_2_5 -d squid-2.5 squid
The -r option specifies the revision tag to retrieve. Omitting the -r option gets you the head branch. The -d option changes the top-level directory name in which files are placed. If you omit the -d option, the top-level directory is the same as the module name. The final command-line argument (squid) is the name of the module to check out.
Once you have the Squid source tree checked out, you can run the cvs update command to update your files and synchronize with the master repository. Additional interesting commands are cvs diff, cvs log, and cvs annotate.
To learn more about CVS, visit http://www.cvshome.org/.
devel.squid-cache.org
The Squid developers maintain a separate site, currently hosted at SourceForge, for experimental Squid features. Check it out at http://devel.squid-cache.org/. There you'll find a number of cutting-edge development projects that haven't yet been integrated into the official Squid code base. You can access these projects through SourceForge's anonymous CVS server or download diff files based on the standard releases.
Exercises
Visit the Squid web site or FTP server and look at the recent stable and development releases. How often are new releases made?
Download the most recent stable code.
Use Squid's anonymous CVS server to check out the recent stable branch. Change one of the source files by inserting a blank line, then run cvs diff.
Chapter 3. Compiling and Installing
Squid is designed to be portable and should compile on all major Unix systems, including Linux, BSD/OS, FreeBSD, NetBSD, OpenBSD, Solaris, HP-UX, OSF/DUNIX/TRU-64, Mac OS/X, IRIX, and AIX. Squid also runs on Microsoft Windows. Please see Appendix E for instructions on compiling and running Squid on Windows.
Compiling Squid is relatively straightforward. If you've installed more than a few open source packages, you're probably already familiar with the procedure. You first use a program called ./configure to probe your system and then a program called make to do the actual compiling.
Before getting to that step, however, let's talk about tuning your system in preparation for Squid. Your operating system may have default resource limits that are too low for Squid to run correctly. Most importantly, you need to worry about the number of available file descriptors.
Before You Start
If you've been using Unix for a while, chances are that you've already compiled a number of other software packages. If so, you can probably quickly scan this chapter. The procedure for compiling and installing Squid is similar to many other software distributions.
To compile Squid, you need an ANSI C compiler. Don't be too alarmed by the "ANSI" part. Chances are that if you already have a C compiler, it is compliant with the ANSI specification. The GNU C compiler (gcc) is an excellent choice and widely available. Most operating systems come with a C compiler as a part of the standard installation. The common exceptions are Solaris and HP-UX. If you're using one of those operating systems, you might not have a compiler installed.
Ideally you should compile Squid on the same system on which it will run. Part of the installation process probes your system for certain parameters, such as the number of available file descriptors. However, if your system doesn't have a C compiler, you may be able to compile Squid elsewhere and then copy the binaries back. If the operating systems are different, Squid may encounter some problems. Also, Squid may become confused if the two systems have different kernel configurations.
In addition to a C compiler, you'll also need Perl and awk. awk is a standard program on all Unix systems, so you shouldn't need to worry about it. Perl is quite common, but it may not be installed on your system by default. You may need