#!/bin/sh

SVNLOOK=/usr/bin/svnlook
PROHIBIT=0

REPOS="$1"
TXN="$2"

# Don't accept commits with term "PROHIBIT-CHECKIN" in a changed line.
$SVNLOOK diff -t "$TXN" "$REPOS" | grep -E "^[-\+].*?PROHIBIT-CHECKIN" 2>/dev/null && PROHIBIT=1

# If the commit message contains "ALLOW-CHECKIN" remove the
# PROHIBIT-flag and let the checkin pass.
$SVNLOOK log -t "$TXN" "$REPOS" | grep "ALLOW-CHECKIN" 2>/dev/null && PROHIBIT=0

# Test if the PROHIBIT-flag is set and act.
if [ "$PROHIBIT" = "1" ]; then
    echo "\nTried to commit a line which was tagged with: PROHIBIT-CHECKIN.\n" >&2
    exit 1
fi

# All checks passed, so allow the commit.
exit 0