trigger a downstream travis build

trigger-travis.sh

#!/bin/bash
## brief: trigger a downstream travis build
## see: travis API documentation
## forked from https://raw.githubusercontent.com/stephanmg/travis-dependent-builds/master/trigger-travis.sh

# variables
USER=$1
REPO=$2
TRAVIS_ACCESS_TOKEN=$3
BRANCH=$4
MESSAGE=$5

# login to travis and get token
travis login --skip-completion-check --pro --github-token $TRAVIS_ACCESS_TOKEN
travis whoami --skip-completion-check
TOKEN=$(travis token --pro --skip-completion-check)
IFS=' ' read -r -a array <<< "$TOKEN"
TOKEN=${array[${#array[@]}-1]}
echo $TOKEN
echo $USER%2F$REPO

# BUILD_NUM=$(curl -s 'https://api.travis-ci.com/repo/3762845/builds' | grep -o '^\[{"id":[0-9]*,' | grep -o '[0-9]' | tr -d '\n')
# echo $BUILD_NUM
# curl -X POST https://api.travis-ci.com/builds/$BUILD_NUM/restart --header "Authorization: token "$TOKEN

# inspired from plume-lib, check arguments and add message
if [ $# -eq 5 ] ; then
    MESSAGE=",\"message\": \"$5\""
elif [ -n "$TRAVIS_REPO_SLUG" ] ; then
    MESSAGE=",\"message\": \"Triggered from upstream build of $TRAVIS_REPO_SLUG by commit "`git rev-parse --short HEAD`"\""
fi

# for debugging
echo "USER=$USER"
echo "REPO=$REPO"
echo "TOKEN=$TOKEN"
echo "BRANCH=$BRANCH"
echo "MESSAGE=$MESSAGE"
echo "  https://api.travis-ci.com/repo/${USER}%2F${REPO}/requests "
# curl POST request content body
BODY="{
  \"request\": {
  \"branch\":\"$BRANCH\"
  $MESSAGE
}}"
echo $BODY
# make a POST request with curl (note %2F could be replaced with 
# / and additional curl arguments, however this works too!)
curl -s -X POST \
  -H "Content-Type: application/json" \
  -H "Accept: application/json" \
  -H "Travis-API-Version: 3" \
  -H "Authorization: token ${TOKEN}" \
  -d "$BODY" \
  https://api.travis-ci.com/repo/${USER}%2F${REPO}/requests \
  | tee /tmp/travis-request-output.$$.txt

if grep -q '"@type": "error"' /tmp/travis-request-output.$$.txt; then
   cat /tmp/travis-request-output.$$.txt
   exit 1
elif grep -q 'access denied' /tmp/travis-request-output.$$.txt; then
   cat /tmp/travis-request-output.$$.txt
   exit 1
fi