Set up upstream project in Travis CI - github

Question

I'm working on project, where I have two Git Repos:
Repo1 - DevRepo, Rep02- TestRepo
My Scenario is:
Whenever a commit or a PR happens on the Repo1:
Step1: Immediately Repo2 should be triggered
Step2: Once Step1 is success, Repo1 should be triggered.
Basically Repo1 should build only if Repo2 is run and it turns success.
Could someone please help me how I can set this up, much appreciated:
which .travis.yml file should I configure to meet my scenario.
exact configuration steps that I can write in my .travis.yml file

Answer 1

Answer: I got this working:
Trigger your dependent build: Repo2 by using the travis api:
Create a trigger_build.sh file and add this code:
`
body='{
"request": {
"branch":"master"
}}'
curl -s -X POST \
-H "Content-Type: application/json" \
-H "Accept: application/json" \
-H "Travis-API-Version: 3" \
-H "Authorization: token ..git_hub_login_token.." \
-d "$body" \
https://api.travis-ci.org/repo/xxxx%2Fyyyy/requests
#The 15s sleep is to allow Travis to trigger the dependent build:
sleep 15`
Create a new or a separate get_build_status.sh file. Poll for the status of the dependent build. Based on the status of the Repo2 build, we will either continue building Repo1 or stop building Repo1:
# Polling for the Repo2 build status
# Setting a maximum time for the Repo2 build to run, however once we get the status to passed/failed, we will return to the Repo1 build run
`i=1
max=300
while [ $i -lt $max ]
do
echo "--------------------------------------------"
echo "Polling for the tests run build status..."`
curl -i -H "Accept: application/vnd.travis-ci.2+json" "https://api.travis-ci.org/repos/xxxx/yyyy/builds" > test.json
LATEST_STATE=$(grep -o '"state":.[a-z\"]*' test.json | head -1)
#LATEST_ID=$(grep -o '"id":.[0-9]*' test.json | head -1 | grep ':.[0-9]*')
get_state_value=${LATEST_STATE#*:}
STATE="${get_state_value//\"}"
if [ $STATE == "passed" ]
then
echo "TESTS RUN... $STATE :-) "
break #As soon as the Repo2 run pass, we break and return back to the Repo1 build run
elif [ $STATE == "failed" ]
then
echo "TESTS RUN... $STATE :-("
echo "Stop building elements"
exit 1 #As soon as the Repo2 run fail, we stop building Repo1
fi
true $(( i++ ))
sleep 1 #This 1s is required to poll the build status for every second
done
Your .travis.yml configuration:
script:
- chmod 777 ./trigger_build.sh
- chmod 777 ./get_build_status.sh
- ./trigger_build.sh
- ./get_build_status.sh

Answer 2

I've now built a CI service for this purpose. It lives here: https://github.com/cesium-ml/dependent_build_server
The above code basically does the following:
Wait for GitHub to let it know when a PR has changed
Use the Travis-CI API to trigger a build of the project, and insert two environment variables to describe which version of the code to build.
Listen for Travis-CI to report back, via webhook, the result of the build.
Use the GitHub API to report the new status to the PR.
Note: You have to verify the payloads that come from GitHub and Travis-CI. This is trivial for GitHub, but slightly harder for Travis-CI which uses proper key signing.
GitHub:
import hmac
def verify_signature(payload, signature, secret):
expected = 'sha1=' + hmac.new(secret.encode('ascii'),
payload, 'sha1').hexdigest()
return hmac.compare_digest(signature, expected)
Travis-CI:
from OpenSSL import crypto
def verify_signature(payload, signature):
# Get this by querying the Travis-CI config API
public_key = crypto.load_publickey(crypto.FILETYPE_PEM, pubkey)
certificate = crypto.X509()
certificate.set_pubkey(public_key)
try:
crypto.verify(certificate, signature, payload, 'sha1')
return True
except crypto.Error:
return False