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import subprocess

ORCHE_URL = 'http://127.0.0.1:8080/'
BUILD_SCRIPT = 'bild_a_system.sh'
DEPLOY_SCRIPT = 'deploy_a_system.sh'
DEFINITIONS_DIR='/home/patrickdarley/definitions'
REF = "cu010-trove/br6/firehose-test-1"

whitelist = [
        'clusters/tlsa.morph',
        'systems/base-system-x86_64-generic.morph',
        'strata/build-essential.morph',
        'strata/core.morph',
        'strata/foundation.morph',
        'strata/bsp-x86_64-generic.morph',
    ]

def files_changed():
    ''' return a list of files changed in latest commit to definitions'''
    import os
    owd = os.getcwd()
    os.chdir(DEFINITIONS_DIR)
    SHAcmd = ['git', 'log', REF, '--format=format:%H', '-2']
    SHAproc = subprocess.Popen(cmd, stdout=subprocess.PIPE)
    SHAout, SHAerr = p.communicate()
    SHA = SHAout.split()
    cmd = ['git', 'diff', '--name-only', SHA[0], SHA[1]]
    p = subprocess.Popen(cmd, stdout=subprocess.PIPE)
    out, err = p.communicate()
    os.chdir(owd)
    return out.split()

def find_systems_affected_by_change():
    # TODO for each file changed, separate into chunks, strata, systems and clusters
    # TODO for each strata get it's system
    pass

def find_clusters_affected_by_change():
    changed systems = find_systems_affected_by_change()
    # TODO for each system get it's custers

def build(system):
    return subprocess.call(['sh','%s' % BUILD_SCRIPT, '%s' % system])

def deploy(cluster):
    return subprocess.call(['sh','%s' % DEPLOY_SCRIPT, '%s' % cluster])

def trigger_testing(build_id):
    import requests
    global url
    url = '%sbuild_complete' % ORCHE_URL
    payload = {'artefact':build_id}
    r = requests.post(url,data=payload)
    return r.ok

if __name__ == '__main__':
    _files_changed = files_changed()
    for f in _files_changed:
        if f in whitelist:
            build_exit_val = build('systems/base-system-x86_64-generic.morph')
            if build_exit_val: exit(build_exit_val)
            deploy_exit_val = deploy('clusters/tlsa.morph')
            if deploy_exit_val: exit(deploy_exit_val)
            exit(trigger_testing())