Ticket #897: pre-commit.cmd

@ECHO OFF
REM PRE-COMMIT HOOK
REM
REM The pre-commit hook is invoked before a Subversion txn is
REM committed.  Subversion runs this hook by invoking a program
REM (script, executable, binary, etc.) named 'pre-commit' (for which
REM this file is a template), with the following ordered arguments:
REM
REM   [1] REPOS-PATH   (the path to this repository)
REM   [2] TXN-NAME     (the name of the txn about to be committed)
REM
REM The default working directory for the invocation is undefined, so
REM the program should set one explicitly if it cares.
REM
REM If the hook program exits with success, the txn is committed; but
REM if it exits with failure (non-zero), the txn is aborted, no commit
REM takes place, and STDERR is returned to the client.   The hook
REM program can use the 'svnlook' utility to help it examine the txn.
REM
REM On a Unix system, the normal procedure is to have 'pre-commit'
REM invoke other programs to do the real work, though it may do the
REM work itself too.
REM
REM   ***  NOTE: THE HOOK PROGRAM MUST NOT MODIFY THE TXN, EXCEPT  ***
REM   ***  FOR REVISION PROPERTIES (like svn:log or svn:author).   ***
REM
REM   This is why we recommend using the read-only 'svnlook' utility.
REM   In the future, Subversion may enforce the rule that pre-commit
REM   hooks should not modify the versioned data in txns, or else come
REM   up with a mechanism to make it safe to do so (by informing the
REM   committing client of the changes).  However, right now neither
REM   mechanism is implemented, so hook writers just have to be careful.
REM
REM Note that 'pre-commit' must be executable by the user(s) who will
REM invoke it (typically the user httpd runs as), and that user must
REM have filesystem-level permission to access the repository.
REM
REM On a Windows system, you should name the hook program
REM 'pre-commit.bat' or 'pre-commit.exe',
REM but the basic idea is the same.
REM
REM Here is an example hook script, for a Windows CMD.exe interpreter:

SET REPOS=%1
SET TXN=%2

SET SVN_DIR=C:\Program Files\Subversion
SET PYTHON_DIR=C:\Program Files\Python23
SET HOOKS_DIR=C:\... the hook folder of the repository ...\hooks
SET TRAC_ENV=C:\... trac folder ...\trac.db

SET PYTHON="%PYTHON_DIR%\python.exe"
SET SVN="%SVN_DIR%\bin\svn.exe"
SET SVNADMIN="%SVN_DIR%\bin\svnadmin.exe"
SET SVNLOOK="%SVN_DIR%\bin\svnlook.exe"

FOR /F "usebackq delims==" %%i IN (`%%SVNLOOK%% log -t %TXN% %REPOS%`)
DO SET LOG=%%i

%PYTHON% "%HOOKS_DIR%\trac-pre-commit-hook" "%TRAC_ENV%" "%LOG%" || exit 1