Post Bamboo Builds to Slack via curl

slack.sh

#!/bin/bash

WEBHOOK_URL=$1

# https://confluence.atlassian.com/display/BAMBOO050/Bamboo+variables#Bamboovariables-Build-specificvariables
PLAN="${bamboo.buildPlanName}" 
RESULTS="${bamboo.buildResultsUrl}" 
KEY="${bamboo.buildResultKey}"
BRANCH="${bamboo.repository.branch.name}"

# OMGWTF Hack because Bamboo interpolates the variable name if no value is set.
# OMGWTF2 if [[ "$TRIGGERED_BY" = *"ManualBuildTriggerReason"* ]] doesn't work, so I had to use shell "case" block.
case "$TRIGGERED_BY" in
*"ManualBuildTriggerReason"*) TRIGGERED_BY=Git
;;
esac

echo "Plan Name: $PLAN"
echo "Plan Key: $KEY"
echo "Plan Branch: $BRANCH"
echo "Plan URL: $RESULTS"
echo "Triggered By: $TRIGGERED_BY"

WEBHOOK_JSON="payload={\"channel\": \"#bamboo-builds\", \"username\": \"bamboo\", \"icon_emoji\": \":bamboo:\", \"attachments\": [ { \"fallback\": \"Build Started: <${RESULTS}|${PLAN} - ${KEY}>\", \"pretext\" : \"Build Started\", \"title\": \"${PLAN}\",  \"text\" : \"<${RESULTS}|${KEY}>\",\"fields\": [ { \"title\": \"Branch\", \"value\": \"${BRANCH}\", \"short\": true }, { \"title\": \"Triggered By\", \"value\": \"${TRIGGERED_BY}\", \"short\": true } ] } ] }"
echo "Sending JSON to Slack:"
echo $WEBHOOK_JSON

curl -s -X POST --data-urlencode "$WEBHOOK_JSON" $WEBHOOK_URL

Environment variable configuration:
TRIGGERED_BY=${bamboo.ManualBuildTriggerReason.userName}

Because Bamboo just puts the literal variable into the script if it is not set with a value, so we hide it in valid variable name (variable names cannot have dots in them).