Merge pull request #410 from tombh/376-move-slugbuilder-hook

Tested, works great. Thanks very much, Tom!

Author: mboersma

bin/slugbuilder-hook.py

@@ -0,0 +1,168 @@
+#!/opt/deis/controller/venv/bin/python
+from yaml.error import YAMLError
+import argparse
+import getpass
+import json
+import os
+import subprocess
+import sys
+import yaml
+
+SLUG_DIR = os.environ['SLUG_DIR']
+CONTROLLER_DIR = os.environ['CONTROLLER_DIR']
+
+
+def parse_args():
+    desc = """
+Process a git push by running it through the buildpack process
+
+Note this script must be run as the `git` user.
+"""
+    parser = argparse.ArgumentParser(description=desc,
+                                     formatter_class=argparse.RawDescriptionHelpFormatter)
+    parser.add_argument('src', action='store',
+                        help='path to source repository')
+    parser.add_argument('user', action='store',
+                        help='name of user who started build',
+                        default='system')
+    # check execution environment
+    if getpass.getuser() != 'git':
+        sys.stderr.write('This script must be run as the "git" user\n')
+        parser.print_help()
+        sys.exit(1)
+    args = parser.parse_args()
+    args.src = os.path.abspath(args.src)
+    # store app ID
+    args.app = '/'.join(args.src.split(os.path.sep)[-1:]).replace('.git', '')
+    return args
+
+
+def puts_step(s):
+    sys.stdout.write("-----> %s\n" % s)
+    sys.stdout.flush()
+
+
+def puts_line():
+    sys.stdout.write("\n")
+    sys.stdout.flush()
+
+
+def puts(s):
+    sys.stdout.write("       " + s)
+    sys.stdout.flush()
+
+
+def exit_on_error(error_code, msg):
+    sys.stderr.write(msg)
+    sys.stderr.write('\n')
+    sys.stderr.flush()
+    sys.exit(error_code)
+
+
+if __name__ == '__main__':
+    args = parse_args()
+    # get sha of master
+    try:
+        with open(os.path.join(args.src, 'refs/heads/master')) as f:
+            sha = f.read().strip('\n')
+    except IOError:
+        exit_on_error(2, 'Could not read the repository SHA--is the refspec correct?')
+    # prepare for buildpack run
+    slug_path = os.path.join(SLUG_DIR, '{0}-{1}.tar.gz'.format(args.app, sha))
+    # create cache dir
+    cache_dir = os.path.join(args.src, 'cache')
+    if not os.path.exists(cache_dir):
+        os.mkdir(cache_dir)
+    # build/compile
+    cmd = "git archive master | docker run -i -a stdin" \
+          " -v {cache_dir}:/tmp/cache:rw " \
+          " -v /opt/deis/build/packs:/tmp/buildpacks:rw " \
+          " deis/slugbuilder"
+    cmd = cmd.format(**locals())
+    p = subprocess.Popen(cmd, cwd=args.src, shell=True, stdout=subprocess.PIPE)
+    rc = p.wait()
+    if rc != 0:
+        exit_on_error(rc, 'Could not execute build, leaving current release in place')
+    container = p.stdout.read().strip('\n')
+    # attach to container and wait for build
+    cmd = 'docker attach {container}'.format(**locals())
+    p = subprocess.Popen(cmd, cwd=args.src, shell=True)
+    rc = p.wait()
+    if rc != 0:
+        exit_on_error(rc, 'Build failed, leaving current release in place')
+    # extract slug
+    cmd = 'docker cp {container}:/tmp/slug.tgz .'.format(**locals())
+    p = subprocess.Popen(cmd, cwd=args.src, shell=True)
+    rc = p.wait()
+    if rc != 0:
+        exit_on_error(rc, 'Could not extract slug from container')
+    os.rename(os.path.join(args.src, 'slug.tgz'), slug_path)
+    # extract procfile
+    cmd = 'tar xfO {slug_path} ./Procfile'.format(**locals())
+    p = subprocess.Popen(cmd, cwd=args.src, shell=True, stdout=subprocess.PIPE)
+    rc = p.wait()
+    if rc != 0:
+        exit_on_error(rc, 'Could not extract Procfile from container')
+    try:
+        procfile = yaml.safe_load(p.stdout.read())
+    except YAMLError as e:
+        exit_on_error(1, 'Invalid Procfile format: {0}'.format(e))
+    # extract release
+    cmd = 'tar xfO {slug_path} ./.release'.format(**locals())
+    p = subprocess.Popen(cmd, cwd=args.src, shell=True, stdout=subprocess.PIPE)
+    rc = p.wait()
+    if rc != 0:
+        exit_on_error(rc, 'Could not extract Release from container')
+    try:
+        release = yaml.safe_load(p.stdout.read())
+    except YAMLError as e:
+        exit_on_error(1, 'Invalid Release format: {0}'.format(e))
+    # remove the container
+    cmd = 'docker rm {container}'.format(**locals())
+    p = subprocess.Popen(cmd, cwd=args.src, shell=True, stdout=subprocess.PIPE)
+    rc = p.wait()
+    if rc != 0:
+        exit_on_error(rc, 'Could not remove build container')
+    # calculate checksum
+    p = subprocess.Popen(['sha256sum', slug_path], stdout=subprocess.PIPE)
+    rc = p.wait()
+    if rc != 0:
+        exit_on_error(rc, 'Could not calculate SHA of slug')
+    checksum = p.stdout.read().split(' ')[0]
+    # prepare the push-hook
+    push = {'username': args.user, 'app': args.app, 'sha': sha, 'checksum': checksum,
+            'config': release.get('config_vars', {})}
+    # TODO: why can't we run this with `sudo -u deis`?
+    output = subprocess.check_output(
+        ['sudo', '-u', 'deis', "{}/bin/pre-push-hook".format(CONTROLLER_DIR)])
+    data = json.loads(output)
+    ip = data['domain']
+    push['url'] = "http://{ip}/slugs/{args.app}-{sha}.tar.gz".format(**locals())
+    push['procfile'] = procfile
+    # calculate slug size
+    push['size'] = os.stat(slug_path).st_size
+    puts_line()
+    # run stage
+    sys.stdout.write("       " + "Launching... ")
+    sys.stdout.flush()
+    p = subprocess.Popen(['sudo', '-u', 'deis', "{}/bin/push-hook".format(CONTROLLER_DIR)],
+                         stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+    stdout, stderr = p.communicate(json.dumps(push))
+    rc = p.wait()
+    if rc != 0:
+        raise RuntimeError('Build error {0}'.format(stderr))
+    databag = json.loads(stdout)
+    sys.stdout.write("done, v{}\n".format(databag['release']['version']))
+    sys.stdout.flush()
+    puts_line()
+    puts_step("{args.app} deployed to Deis".format(**locals()))
+    domains = databag.get('domains', [])
+    if domains:
+        for domain in domains:
+            puts("http://{domain}\n".format(**locals()))
+    else:
+        puts('No proxy nodes found for this formation.\n')
+    puts_line()
+    puts('To learn more, use `deis help` or visit http://deis.io')
+    puts_line()
+    puts_line()