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sshrcにコマンドを入れたら `Received message too long 1869283328` で怒られた

SSHで接続されたときにSlackへ通知するスクリプトを sshrc に仕込んだら、SFTPで以下のメッセージで怒られて接続に失敗しました。

Received message too long 1869283328
Ensure the remote shell produces no output for non-interactive sessions.

修正前

コマンドの実行結果を標準出力していました。

/etc/ssh/sshrc
curl -X POST --data-urlencode 'payload={"channel": "'"$SLACK_CHANNEL"'", "username": "'"$SLACK_USERNAME"'", "text": "'"${SLACK_MESSAGE}"'", "icon_emoji": "'":${SLACK_ICON_EMOJI}:"'"}' ${SLACK_WEBHOOK_URL}

修正後

コマンドの実行結果を /dev/null へ強引にリダイレクトさせました。具体的には、コマンドの末尾に &> /dev/null を追加しただけです。

/etc/ssh/sshrc
curl -X POST --data-urlencode 'payload={"channel": "'"$SLACK_CHANNEL"'", "username": "'"$SLACK_USERNAME"'", "text": "'"${SLACK_MESSAGE}"'", "icon_emoji": "'":${SLACK_ICON_EMOJI}:"'"}' ${SLACK_WEBHOOK_URL} &> /dev/null

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