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7.4 Interfacing with External Programs

CVS is rarely used alone. There are a number of project-management tools available, each used to perform a different set of tasks. The scripting files can be used to connect CVS to other project-management tools, such as bug trackers and build scripts.

7.4.1 Interfacing with Bug Trackers

Interfacing with a bug tracker is easiest if the tracker accepts input from standard input or via an email form. Use the rcsinfo file to have the cvs commit editor screen include the template your bug tracker requires, and use the verifymsg file to ensure that all fields are filled in appropriately. Then have a script in verifymsg or loginfo mail the log data to your bug tracker.

Example 7-11 and Example 7-12 show how to integrate with the Bugzilla bug-tracking tool, available at http://bugzilla.mozilla.org/. These examples assume that the Bugzilla email gateway has been enabled. The @resolution field in the message template allows you to change a project's status and is supported directly by Bugzilla.

Use the verifymsg script in Example 7-11 to separate out the bug ID so it can be used in the mail subject (which must have the format [Bug XXXX]). The rest of the log message can be sent as the mail body. The script uses the read command to get the bug ID from the first line of the log message, checks that the first line it reads uses the format it expects, and then mails the bug ID and the rest of the stdin input to the user bugzilla on the same computer. The script returns 1 if the format was wrong and 0 if it succeeds in mailing everything to Bugzilla.

Example 7-11. Interfacing with Bugzilla, verifymsg
#! /bin/bash
read prompt bugid
if [ $prompt != '@bugid' ]; then
     return 1
else
     mail -s "[Bug $bugid]" bugzilla
fi
return 0

Example 7-12 shows an rcsinfo template file that contains the @bugid string that Example 7-11 expects and the @resolution and @message strings that Bugzilla supports. You should enter the bug ID, resolution status, and a log message to the right of each of these prompts.

Example 7-12. Interfacing with Bugzilla, message template
@bugid 
@resolution
@message

A more complete verifymsg script than the one shown in Example 7-11 would include a facility to strip comments out of the template file, and the template file would have comments explaining what to write beside each prompt. (CVS strips lines that start with the string CVS:, so you can use that mechanism instead of your own comment-stripping code.)

Example 7-13 shows the lines in the verifymsg and rcsinfo files that would call these scripts for the wizzard project, if the scripts were called bugzilla-mail and bugzilla-template.

Example 7-13. Interfacing with Bugzilla, scripting files
# In verifymsg, call the script bugzilla-mail
^wizzard\(/\|$\) /var/lib/cvsroot/CVSROOT/scripts/bugzilla-mail
   
# In rcsinfo, call bugzilla-template
^wizzard\(/\|$\) /var/lib/cvsroot/CVSROOT/scripts/bugzilla-template

7.4.2 Interfacing with Build Scripts

A build for publication should be slightly different from a build for development. During development, your developers want to start with a recent sandbox, build from that sandbox, make their changes, and then test only those changes. However, a build for testing or publication should be taken from a known set of revisions, frequently the most up-to-date revisions.

Fortunately, both building for incremental testing and building for a major release can be done using the same build script. If the script is included in the project files and designed to be able to be run from a sandbox, the developers can run their test builds from their sandboxes and the project lead can run testing or publication builds from an exported copy of the project files. Note that it's good practice to tag the project's files just before a testing or publication build, so that the exact revisions can be easily retrieved later.

If your developers are sharing a central set of files and have only a partial set of the project's files in their sandboxes, you can have the build script set up symbolic links to the shared files from their sandboxes or call files from a central location.

If your developers are changing copies of a set of files but will eventually want to distribute your project's files across several unrelated directories, it is best to develop the project to build under a single root directory, then distribute the files across multiple directories as part of the installation script.

Example 7-14 is a script for the wizzard project that tags the head revisions of all files, then builds and installs the project (assuming the Makefile is properly configured). To create a build of this script for development, produce a smaller script that contains only the make and make install commands and run the miniscript from a developer's sandbox. To create a build of the project for testing or publication, run the full script given in Example 7-14 from any directory.

Example 7-14. Building for testing or publication
/usr/bin/cvs -d cvs:/var/lib/cvs rtag -r HEAD $1 wizzard
if [ $? -eq 0 ]; then
     cd /tmp
     /usr/bin/cvs -d cvs:/var/lib/cvs export -r $1 wizzard
     if [ $? -eq 0 ]; then
          cd wizzard
          /usr/bin/make
          /usr/bin/make install
     else
          echo "Export failed."
     fi     
else
        echo "Tag failed."
fi

7.4.3 Enforcing Standards

The different scripting files can be used in the following ways to enforce project standards:

commitinfo

Can be used to run a program through a layout checker, run a system configuration file through a syntax checker, or run a documentation file through a spelling and grammar checker. If the checker returns a nonzero exit status, the file is not committed and the commit fails for all files in that commit.

verifymsg

Can be used to ensure that log messages meet the project's standards and contain the correct fields. This file can also be used to generate fields and include them in the log message.

taginfo

Can be used to enforce a standard format for tag names.


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