As I mentioned early I've been working on a SVN post-commit script. We've got a SVN repository that will be modified by several remote developers and I really need to keep an eye on this repository and I need to closely monitor changes to this repository.

There are two major functions that I needed in my post-commit script:

1. I needed to update the working copy on my server
2. I needed to e-mail the changes to myself, so I know when developers are making changes

There are an abundant of examples showing off how to do this in various *nix flavors, but I couldn't find any good Windows-based solutions that didn't require Perl to be installed on the server. That led me to create the following post-commit.bat script.

@ECHO OFF
REM *************************************************************
REM * this sets the arguments supplied by Subversion            *
REM *************************************************************
SET REPOS=%1
SET REV=%2

REM *************************************************************
REM * define directory paths                                    *
REM * you *must* add any paths for command line tools you plan  *
REM * since SVN does not include the Windows %PATH% environment *
REM * variable for security reasons.                            *
REM *                                                           *
REM * DIR  - the current hooks directory                        *
REM * PATH - a user set path of where executables are located   *
REM *                                                           *
REM *************************************************************
SET DIR=%REPOS%/hooks
REM *************************************************************
REM * make sure to add the path to the SendEmail executable     *
REM *************************************************************
SET PATH=%PATH%;%DIR%;C:\Utils 

REM *************************************************************
REM * define the path to the working copy of your code          *
REM *                                                           *
REM * the default working_copy folder would be:                 *
REM * file:///%REPOS%                                           *
REM *************************************************************
SET WORKING_COPY=c:\path\to\working\copy

REM *************************************************************
REM * define e-mail parameters                                  *
REM *************************************************************
SET SITENAME=My Code Base
SET SMTP_SERVER=smtp.yourdomain.com
SET EMAIL_TO=svnupdates@yourdomain.com
SET EMAIL_FROM=svnupdates@yourdomain.com
SET SUBJECT=SVN Update - %SITENAME% - rev %REV% - %REPOS%

REM *************************************************************
REM * update the local working copy                             *
REM * this will sync the new changes to your servers copy       *
REM *************************************************************
svn update %WORKING_COPY%

REM *************************************************************
REM * generate the header to use for the e-mail message         *
REM *************************************************************
ECHO The following changes were made to the code: > %DIR%/email.txt
ECHO. >> %DIR%/email.txt

REM *************************************************************
REM * dump the log of changes to the e-mail message             *
REM *************************************************************
svn log %WORKING_COPY% -v -r "%REV%" >> %DIR%/email.txt

REM *************************************************************
REM * dump the diff changes to the e-mail message               *
REM *                                                           *
REM * WARNING: Generates tons of output                         *
REM *                                                           *
REM * NOTE: this is optional, you can remove this information   *
REM *       if you do not want a verbose message of changes     *
REM *************************************************************
svn diff %WORKING_COPY% -c "%REV%" --no-diff-deleted >> %DIR%/email.txt

REM *************************************************************
REM * send the e-mail message to the user                       *
REM *                                                           *
REM * NOTE: to create a SendEmail.log file, append:             *
REM *                                                           *
REM *        -l %DIR%/SendEmail.log                             *
REM *                                                           *
REM *       at the end of the line below.                       *
REM *************************************************************
sendEmail -s %SMTP_SERVER% -t %EMAIL_TO% -f %EMAIL_FROM% -u "%SUBJECT%" -o message-file=%DIR%/email.txt

A couple of notes on the script above:

• You'll need to download SendEmail in order to send the e-mail messages. In the environmental variable %PATH% you'll want to make sure to include the path where you copied the SendEmail.exe. In the example above, the SendEmail.exe is located in the C:\Utils directory.
• Make sure to go through the script and replace any variables declared with the SET command with the values that coorelated to your environment.
• In my case I required a working copy to be placed on my server, as it's used as a global development environment. If you do not require a local working copy, you can comment out the svn update %WORKING_COPY% line (by placing the command REM in front of the line.) You would then change your WORKING_COPY variable to the URL of your SVN repository—which would be file:///%REPOS%.
• The svn diff command can generate a ton of information. In most use cases, you probably do not want to add this information to the e-mail output.

If you have any problems getting this script working, I recommend you check out my blog entry on debugging SVN repository hook scripts in Windows.

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