On my repository, I also reject Tortoise default log messages such as "Moved remotely".

LOGMSG=$($SVNLOOK log -t "$TXN" "$REPOS")

if [ ${#LOGMSG} -lt 10 ]; then
echo -e ">>> Big brother is watching you …
Your commit has been rejected.
Commit again and provide a meaningful log comment: at least 10 characters!" 1>&2
exit 1
fi

if [ "$LOGMSG" == "Moved remotely" -o "$LOGMSG" == "Copied remotely" -o "$LOGMSG" == "Renamed remotely" -o "$LOGMSG" == "Removed file/folder" ]; then
echo -e ">>> Big sister is watching you …
Your commit has been rejected.
Commit again and provide a meaningful log comment: default messages like '$LOGMSG' are not accepted." 1>&2
exit 1
fi

I added a check to reject the Tortoise default log messages

LOGMSG=$($SVNLOOK log -t "$TXN" "$REPOS")

if [ ${#LOGMSG} -lt 10 ]; then
echo -e ">>>
Your commit has been rejected.
Commit again and provide a meaningful log comment: at least 10 characters!" 1>&2
exit 1
fi

if [ "$LOGMSG" == "Moved remotely" -o "$LOGMSG" == "Copied remotely" -o "$LOGMSG" == "Renamed remotely" -o "$LOGMSG" == "Removed file/folder" ]; then
echo -e ">>> Big sister is watching you …
Your commit has been rejected.
Commit again and provide a meaningful log comment: default messages like '$LOGMSG' are not accepted." 1>&2
exit 1
fi