pre-commit hook for checking if someone is committing into a certain folder within a subversion repo, and telling them to move their commits elsewhere.

pre-commit

# Tell everyone to bugger off elsewhere
echo "THIS REPOSITORY HAS MOVED TO BITBUCKET" >&2
echo "https://bitbucket.org/pixelmedia/bdc-website" >&2
exit 1


# OR
# Check where in the repo they are committing, before you tell them to bugger off
LINES=$(svnlook changed $REPOS -t $TXN)
FOLDER_NAME="web-template/"
for line in $LINES
do
  if [[ "$line" == *"$FOLDER_NAME"* ]]
	then
		echo "This has moved to bitbucket" >&2
		echo "https://bitbucket.org/REPO-PATH" >&2
		exit 1
	fi
done

Thanks to @clavery for the cleverness of the second part