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import tempfile
import pathlib
import tarfile
import subprocess
import io
import time
import contextlib
import yaml
import libvirt
import paramiko
import hatter.json_validator
def run(log, repo_path, commit='HEAD', archive_name='hatter_archive'):
log.info('starting executor for repository {} ({})'.format(repo_path,
commit))
t_begin = time.monotonic()
archive_file_name = archive_name + '.tar.gz'
with tempfile.TemporaryDirectory() as tempdir:
archive_path = pathlib.Path(tempdir) / archive_file_name
log.info('fetching remote repository')
_git_archive(repo_path, commit, archive_path)
log.info('loading project configuration')
conf = _load_conf(archive_path)
for i in conf:
log.info('starting virtual machine')
with contextlib.closing(_VM(i['vm'])) as vm:
log.info('creating SSH connection')
with contextlib.closing(_SSH(i['ssh'], vm.address)) as ssh:
log.info('transfering repository to virtual machine')
ssh.execute('rm -rf {} {}'.format(archive_file_name,
archive_name))
ssh.upload(archive_path, archive_file_name)
ssh.execute('mkdir {}'.format(archive_name))
ssh.execute('tar xf {} -C {}'.format(archive_file_name,
archive_name))
log.info('executing scripts')
for script in i['scripts']:
ssh.execute(script, archive_name, log)
t_end = time.monotonic()
log.info('executor finished (duration: {}s)'.format(t_end - t_begin))
class _VM:
def __init__(self, conf):
self._conn = None
self._domain = None
self._temp_snapshot = None
self._address = None
try:
self._conn = _libvirt_connect(conf.get('uri', 'qemu:///system'))
self._domain = _libvirt_get_domain(self._conn, conf['domain'])
if self._domain.isActive():
self._domain.destroy()
self._temp_snapshot = _libvirt_create_temp_snapshot(
self._domain, conf.get('temp_snapshot', 'temp_hatter'))
if 'snapshot' in conf:
_libvirt_revert_snapshot(self._domain, conf['snapshot'])
_libvirt_start_domain(self._domain)
for _ in range(conf('get_address_retry_count', 10)):
self._address = _libvirt_get_address(self._domain)
if self._address:
return
time.sleep(conf.get('get_address_delay', 5))
raise Exception('ip addess not detected')
except Exception:
self.close()
raise
@property
def address(self):
return self._address
def close(self):
if self._domain:
self._domain.destroy()
if self._domain and self._temp_snapshot:
self._domain.revertToSnapshot(self._temp_snapshot)
if self._temp_snapshot:
self._temp_snapshot.delete()
if self._conn:
self._conn.close()
self._temp_snapshot = None
self._domain = None
self._conn = None
self._address = None
class _SSH:
def __init__(self, conf, address):
self._conn = paramiko.SSHClient()
self._conn.set_missing_host_key_policy(paramiko.AutoAddPolicy)
for _ in range(conf.get('connect_retry_count', 10)):
try:
self._conn.connect(
address,
username=conf['username'], password=conf['password'],
timeout=conf.get('connect_timeout', 1),
auth_timeout=conf.get('connect_timeout', 1))
return
except Exception as e:
time.sleep(conf.get('connect_delay', 5))
raise Exception('could not connect to {}'.format(address))
def close(self):
if self._conn:
self._conn.close()
self._conn = None
def upload(self, src_path, dst_path):
with contextlib.closing(self._conn.open_sftp()) as sftp:
sftp.put(str(src_path), str(dst_path))
def execute(self, cmd, cwd='.', log=None):
if log:
log.info('executing command: {}'.format(cmd))
with contextlib.closing(self._conn.invoke_shell()) as shell:
shell.set_combine_stderr(True)
shell.exec_command('cd {} && {}'.format(cwd, cmd))
with contextlib.closing(shell.makefile()) as f:
data = f.read()
if log:
log.info('command output: {}'.format(data))
exit_code = shell.recv_exit_status()
if exit_code > 0:
raise Exception('command exit code is {}'.format(exit_code))
def _load_conf(archive_path):
with tarfile.open(archive_path) as archive:
f = io.TextIOWrapper(archive.extractfile('.hatter.yml'),
encoding='utf-8')
conf = yaml.safe_load(f)
hatter.json_validator.validate(conf, 'hatter://project.yaml#')
return conf
def _git_archive(repo_path, commit, output_path):
result = subprocess.run(
['git', 'archive', '--format=tar.gz',
'--outfile={}'.format(str(output_path)),
'--remote={}'.format(repo_path),
commit],
stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
if result.returncode:
raise Exception("could not archive {} from {}".format(commit,
repo_path))
def _libvirt_connect(uri):
conn = libvirt.open(uri)
if not conn:
raise Exception('could not open connection to {}'.format(uri))
return conn
def _libvirt_get_domain(conn, domain_name):
domain = conn.lookupByName(domain_name)
if not domain:
raise Exception('domain {} not available'.format(domain_name))
return domain
def _libvirt_start_domain(domain):
if domain.create():
raise Exception('could not run vm')
def _libvirt_create_temp_snapshot(domain, temp_snapshot_name):
temp_snapshot = domain.snapshotLookupByName(temp_snapshot_name)
if temp_snapshot:
temp_snapshot.delete()
temp_snapshot = domain.snapshotCreateXML(
"<domainsnapshot><name>{}</name></domainsnapshot>".format(
temp_snapshot_name))
if not temp_snapshot:
raise Exception('could not create snapshot {}'.format(
temp_snapshot_name))
return temp_snapshot
def _libvirt_revert_snapshot(domain, snapshot_name):
snapshot = domain.snapshotLookupByName(snapshot_name)
if not snapshot:
raise Exception('snapshot {} not available'.format(snapshot_name))
if domain.revertToSnapshot(snapshot):
raise Exception('could not revert snapshot {}'.format(snapshot_name))
def _libvirt_get_address(domain):
addresses = domain.interfaceAddresses(0)
for i in addresses.values():
for j in i.get('addrs', []):
return j.get('addr')
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