An OBS (Open Build Service) Build Trigger System for GitHub Repositories

obs_build_trigger.py

#!/usr/bin/python3
"""OBS Build Trigger System for GitHub Repositories
This script looks into a specific repository branch on GitHub and triggers
a build request through the OBS API if the last commit hash has changed.

To get the API Token for your OBS Project run:

$ osc token --create [PROJECT] [PACKAGE]

based on https://github.com/mschnitzer/obs-build-trigger
"""

import os
import http.client
import json

PROGNAME = os.path.basename(__file__)

GITHUB_API = os.environ.get('GITHUB_API', default='api.github.com')
GITHUB_AUTH_TOKEN = os.environ.get('GITHUB_AUTH_TOKEN')
GITHUB_REPO = dict(
    owner=os.environ.get('GITHUB_REPO_OWNER'),
    name=os.environ.get('GITHUB_REPO_NAME'),
    branch=os.environ.get('GITHUB_REPO_BRANCH', default='master'),
)

OBS_API = os.environ.get('OBS_API', default='api.opensuse.org')
OBS_PROJECT = os.environ.get('OBS_PROJECT',
                             default=f"home:{GITHUB_REPO['owner']}:{GITHUB_REPO['name']}")
OBS_PACKAGE = os.environ.get('OBS_PACKAGE', default=GITHUB_REPO['name'])
OBS_TOKEN = os.environ.get('OBS_TOKEN')

DATA_FILE = os.environ.get('DATA_FILE', default=f"{GITHUB_REPO['name']}.hash")


def get_saved_commit_hash():
    try:
        with open(DATA_FILE, 'r') as f:
            return f.read()
    except FileNotFoundError:
        return None


def save_commit_hash(commit_hash):
    with open(DATA_FILE, 'w') as f:
        f.write(commit_hash)


def get_commit_hash():
    headers = {'User-Agent': PROGNAME}

    if GITHUB_AUTH_TOKEN:
        headers['Authorization'] = f"Token {GITHUB_AUTH_TOKEN}"

    uri_path = "/repos/{owner}/{name}/git/refs/heads/{branch}".format(**GITHUB_REPO)
    conn = http.client.HTTPSConnection(GITHUB_API)
    conn.request('GET', uri_path, None, headers)

    try:
        response = conn.getresponse()
        data = json.loads(response.read())
    finally:
        conn.close()

    if response.status != 200:
        raise ConnectionError(response.status, response.reason)

    return data['object']['sha']


def trigger_rebuild():
    headers = {'Authorization': f"Token {OBS_TOKEN}"}
    uri_path = f"/trigger/runservice/?project={OBS_PROJECT}&package={OBS_PACKAGE}"
    conn = http.client.HTTPSConnection(OBS_API)
    conn.request('POST', uri_path, None, headers)

    try:
        response = conn.getresponse()
    finally:
        conn.close()

    if response.status != 200:
        raise ConnectionError(response.status, response.reason)

    return response.read()


if __name__ == '__main__':
    if not GITHUB_REPO['owner']:
        raise ValueError('$GITHUB_REPO_OWNER is not set or empty')

    if not GITHUB_REPO['name']:
        raise ValueError('$GITHUB_REPO_NAME is not set or empty')

    if not OBS_TOKEN:
        raise ValueError('$OBS_TOKEN is not set or empty')

    saved_commit_hash = get_saved_commit_hash()
    latest_commit_hash = get_commit_hash()

    if saved_commit_hash != latest_commit_hash:

        print("New commit detected. Triggered rebuild for", latest_commit_hash)
        trigger_rebuild()

        save_commit_hash(latest_commit_hash)

obs_build_trigger_runner.sh

#!/bin/sh
# Add this script to crontab by running:
# $ echo "@daily	$PWD/obs_build_trigger_runner.sh" | crontab -

SCRIPT_DIR="$(dirname "$0")"

export GITHUB_REPO_OWNER=bilelmoussaoui
export GITHUB_REPO_NAME=Hardcode-Tray
export GITHUB_REPO_BRANCH=master
export OBS_PROJECT=home:SmartFinn:hardcode-tray
export OBS_PACKAGE=hardcode-tray
export OBS_TOKEN=xxxxxxxxxxxxxxxxxxxxxxxx
export DATA_FILE="$HOME/.cache/$GITHUB_REPO_OWNER-$GITHUB_REPO_NAME.hash"

mkdir -p "${DATA_FILE%/*}"
python3 "$SCRIPT_DIR/obs_build_trigger.py"