# If the hook program exits with success, the txn is committed; but# if it exits with failure (non-zero), the txn is aborted, no commit# takes place, and STDERR is returned to the client.   The hook# program can use the ‘svnlook‘ utility to help it examine the txn.## On a Unix system, the normal procedure is to have ‘pre-commit‘# invoke other programs to do the real work, though it may do the# work itself too.##   ***  NOTE: THE HOOK PROGRAM MUST NOT MODIFY THE TXN, EXCEPT  ***#   ***  FOR REVISION PROPERTIES (like svn:log or svn:author).   ***##   This is why we recommend using the read-only ‘svnlook‘ utility.#   In the future, Subversion may enforce the rule that pre-commit#   hooks should not modify the versioned data in txns, or else come#   up with a mechanism to make it safe to do so (by informing the#   committing client of the changes).  However, right now neither#   mechanism is implemented, so hook writers just have to be careful.## Note that ‘pre-commit‘ must be executable by the user(s) who will# invoke it (typically the user httpd runs as), and that user must# have filesystem-level permission to access the repository.## On a Windows system, you should name the hook program# ‘pre-commit.bat‘ or ‘pre-commit.exe‘,# but the basic idea is the same.## The hook program typically does not inherit the environment of# its parent process.  For example, a common problem is for the# PATH environment variable to not be set to its usual value, so# that subprograms fail to launch unless invoked via absolute path.# If you‘re having unexpected problems with a hook program, the# culprit may be unusual (or missing) environment variables.# # Here is an example hook script, for a Unix /bin/sh interpreter.# For more examples and pre-written hooks, see those in# the Subversion repository at# http://svn.apache.org/repos/asf/subversion/trunk/tools/hook-scripts/ and# http://svn.apache.org/repos/asf/subversion/trunk/contrib/hook-scripts/REPOS="$1"TXN="$2"# Make sure that the log message contains some text.SVNLOOK=/usr/bin/svnlookLOGMSG=`$SVNLOOK log -t "$TXN" "$REPOS" | grep "[a-zA-Z0-9]" | wc -c`if [ "$LOGMSG" -lt 5 ];then  echo -e "注释信息不能为空且不少于5个字!" 1>&2  exit 1fiexit 0