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You should never commit changes to a tag. Rather, create a branch from it, fix the bug in the branch, and then release the branch. After the release, you can merge the changes from the branch back to the trunk. Since the new branch was released to address that nasty bug, we should tag that release too (see Figure 41-4). This way, we always have a snapshot of released code.

Using the FindBin module has significant advantages over trying to do the same thing ourselves with getcwd and its relatives. It handles various special cases for Windows and VMS systems, and it deals with the possibility that the script name was passed to Perl on the command line rather than triggering Perl via a #! header (and of course it s shorter too). Variations on FindBin are available from CPAN. Two worth mentioning are FindBin::Real and FindBin::libs. FindBin::Real is a functional module with the same features as FindBin but with the variables replaced with subroutines. It handles cases where modules in different directories both attempt to determine the script path, and so is preferred for use in modules. (In typical use, only the script itself needs to find out where it came from.) FindBin::libs takes note of the fact that FindBin is mostly used to locate library directories and combines the two into a single module that first locates library directories relative to the script and then adds them to @INC.

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One way to check if a given module is available is to look in the %INC hash to see if the module is present. We can avoid fatal errors by checking for each module and using it only if already loaded. In the following example, if Module1 is loaded, then we use it, otherwise we look to see if Module2 is loaded: if ($INC{'Module1'}) { # use some functions from Module1 } elsif ($INC{'Module2'}) { # use some functions from Module2 } However, the simplest way would be to try to load it using require. Since this ordinarily produces a fatal error, we use an eval to protect the program from errors: warn "GD module not available" unless eval {require GD; 1};

In the event that the GD module, which is a Perl interface to the libgd graphics library, is not available, eval returns undef, and the warning is emitted. If it does exist, the 1 at the end of the eval is returned, suppressing the warning. This gives us a way of optionally loading modules if they are present but continuing without them otherwise, so we can enable optional functionality if they are present. In this case, we can generate graphical output if GD is present or resort to text otherwise. The special variable $@ holds the syntax error message that is generated by the last eval function. Note that a serious problem arises with the preceding approach if require is replaced with use. The reason is that eval is a run-time function, whereas use is executed at compile time. So, use GD would be executed before anything else, generating a fatal error if the GD module was not available. To solve this problem, simply enclose the whole thing in a BEGIN block, making sure that the whole block is executed at compile time: BEGIN { foreach ('GD', 'CGI', 'Apache::Session') { warn "$_ not available" unless eval "use $_; 1"; } }

Figure 41-4. Tagging Creating a tag is done exactly the same way as creating a branch. You would use the svn copy command to create a tag: > svn copy --message "Tagging 2.0 release of code." http://svn.mydomain.com/product/trunk http://svn.mydomain.com/product/tags/REL_2.0 When tagging, make sure users know it is a tag by either prefixing the name with TAG or putting it in a tags folder. Unlike other version control systems, tags are mutable in Subversion. This means that the tag can still be committed, but that defeats the purpose of a tag. As far as Subversion is concerned, there is no difference between a branch and a tag.

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