/usr/lib/python3/dist-packages/simplestreams/mirrors/command_hook.py is in python3-simplestreams 0.1.0~bzr460-0ubuntu1.
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#
# Author: Scott Moser <scott.moser@canonical.com>
#
# Simplestreams is free software: you can redistribute it and/or modify it
# under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or (at your
# option) any later version.
#
# Simplestreams is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public
# License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with Simplestreams. If not, see <http://www.gnu.org/licenses/>.
import simplestreams.mirrors as mirrors
import simplestreams.util as util
import os
import errno
import signal
import subprocess
import tempfile
REQUIRED_FIELDS = ("load_products",)
HOOK_NAMES = (
"filter_index_entry",
"filter_item",
"filter_product",
"filter_version",
"insert_index",
"insert_index_entry",
"insert_item",
"insert_product",
"insert_products",
"insert_version",
"load_products",
"remove_item",
"remove_product",
"remove_version",
)
DEFAULT_HOOK_NAME = "hook"
ENV_HOOK_NAME = "HOOK"
ENV_FIELDS_NAME = "FIELDS"
class CommandHookMirror(mirrors.BasicMirrorWriter):
"""
CommandHookMirror: invoke commands to implement a SimpleStreamMirror
Available command hooks:
load_products:
invoked to list items in the products in a given content_id.
See product_load_output_format.
filter_index_entry, filter_item, filter_product, filter_version:
invoked to determine if the named entity should be operated on
exit 0 for "yes", 1 for "no".
insert_index, insert_index_entry, insert_item, insert_product,
insert_products, insert_version :
invoked to insert the given entity.
remove_product, remove_version, remove_item:
invoked to remove the given entity
Other Configuration:
product_load_output_format: one of [serial_list, json]
serial_list: The default output should be white space delimited
output of product_name and version.
json: output should be a json formated dictionary formated like
products:1.0 content.
Environments / Variables:
When a hook is invoked, data about the relevant entity is
made available in the environment.
In all cases:
* a special 'FIELDS' key is available which is a space delimited
list of keys
* a special 'HOOK' field is available that specifies which
hook is being called.
For an item in a products:1.0 file that has a 'path' item, the item
will be downloaded and a 'path_local' field inserted into the metadata
which will contain the path to the local file.
If the configuration setting 'item_skip_download' is set to True, then
'path_url' will be set instead to a url where the item can be found.
"""
def __init__(self, config):
if isinstance(config, str):
config = util.load_content(config)
check_config(config)
super(CommandHookMirror, self).__init__(config=config)
def load_products(self, path=None, content_id=None):
(_rc, output) = self.call_hook('load_products',
data={'content_id': content_id},
capture=True)
fmt = self.config.get("product_load_output_format", "serial_list")
loaded = load_product_output(output=output, content_id=content_id,
fmt=fmt)
return loaded
def filter_index_entry(self, data, src, pedigree):
mdata = util.stringitems(src)
mdata['content_id'] = pedigree[0]
mdata.update(util.stringitems(data))
(ret, _output) = self.call_hook('filter_index_entry', data=mdata,
rcs=[0, 1])
return ret == 0
def filter_product(self, data, src, target, pedigree):
return self._call_filter('filter_product', src, pedigree)
def filter_version(self, data, src, target, pedigree):
return self._call_filter('filter_version', src, pedigree)
def filter_item(self, data, src, target, pedigree):
return self._call_filter('filter_item', src, pedigree)
def _call_filter(self, name, src, pedigree):
data = util.products_exdata(src, pedigree)
(ret, _output) = self.call_hook(name, data=data, rcs=[0, 1])
return ret == 0
def insert_index(self, path, src, content):
return self.call_hook('insert_index', data=src, content=content,
extra={'path': path})
def insert_products(self, path, target, content):
return self.call_hook('insert_products', data=target,
content=content, extra={'path': path})
def insert_product(self, data, src, target, pedigree):
return self.call_hook('insert_product',
data=util.products_exdata(src, pedigree))
def insert_version(self, data, src, target, pedigree):
return self.call_hook('insert_version',
data=util.products_exdata(src, pedigree))
def insert_item(self, data, src, target, pedigree, contentsource):
mdata = util.products_exdata(src, pedigree)
tmp_path = None
tmp_del = None
extra = {}
if 'path' in data:
extra.update({'item_url': contentsource.url})
if not self.config.get('item_skip_download', False):
try:
(tmp_path, tmp_del) = util.get_local_copy(contentsource)
extra['path_local'] = tmp_path
finally:
contentsource.close()
try:
ret = self.call_hook('insert_item', data=mdata, extra=extra)
finally:
if tmp_del and os.path.exists(tmp_path):
os.unlink(tmp_path)
return ret
def remove_product(self, data, src, target, pedigree):
return self.call_hook('remove_product',
data=util.products_exdata(src, pedigree))
def remove_version(self, data, src, target, pedigree):
return self.call_hook('remove_version',
data=util.products_exdata(src, pedigree))
def remove_item(self, data, src, target, pedigree):
return self.call_hook('remove_item',
data=util.products_exdata(target, pedigree))
def call_hook(self, hookname, data, capture=False, rcs=None, extra=None,
content=None):
command = self.config.get(hookname, self.config.get(DEFAULT_HOOK_NAME))
if not command:
# return successful execution with no output
return (0, '')
if isinstance(command, str):
command = ['sh', '-c', command]
fdata = util.stringitems(data)
content_file = None
if content is not None:
(tfd, content_file) = tempfile.mkstemp()
tfile = os.fdopen(tfd, "w")
tfile.write(content)
tfile.close()
fdata['content_file_path'] = content_file
if extra:
fdata.update(extra)
fdata['HOOK'] = hookname
try:
return call_hook(command=command, data=fdata,
unset=self.config.get('unset_value', None),
capture=capture, rcs=rcs)
finally:
if content_file:
os.unlink(content_file)
def call_hook(command, data, unset=None, capture=False, rcs=None):
env = os.environ.copy()
data = data.copy()
data[ENV_FIELDS_NAME] = ' '.join([k for k in data if k != ENV_HOOK_NAME])
mcommand = render(command, data, unset=unset)
env.update(data)
return run_command(mcommand, env=env, capture=capture, rcs=rcs)
def render(inputs, data, unset=None):
fdata = data.copy()
outputs = []
for i in inputs:
while True:
try:
outputs.append(i % fdata)
break
except KeyError as err:
if unset is None:
raise
for key in err.args:
fdata[key] = unset
return outputs
def check_config(config):
missing = []
for f in REQUIRED_FIELDS:
if f not in config and config.get(DEFAULT_HOOK_NAME) is None:
missing.append(f)
if missing:
raise TypeError("Missing required config entries for %s" % missing)
def load_product_output(output, content_id, fmt="serial_list"):
# parse command output and return
if fmt == "serial_list":
# "line" format just is a list of serials that are present
working = {'content_id': content_id, 'products': {}}
for line in output.splitlines():
(product_id, version) = line.split(None, 1)
if product_id not in working['products']:
working['products'][product_id] = {'versions': {}}
working['products'][product_id]['versions'][version] = {}
return working
elif fmt == "json":
return util.load_content(output)
return
def run_command(cmd, env=None, capture=False, rcs=None):
if not rcs:
rcs = [0]
if not capture:
stdout = None
else:
stdout = subprocess.PIPE
sp = subprocess.Popen(cmd, env=env, stdout=stdout, shell=False)
(out, _err) = sp.communicate()
rc = sp.returncode
if rc == 0x80 | signal.SIGPIPE:
exc = IOError("Child Received SIGPIPE: %s" % str(cmd))
exc.errno = errno.EPIPE
raise exc
if rc not in rcs:
raise subprocess.CalledProcessError(rc, cmd)
if out is None:
out = ''
elif isinstance(out, bytes):
out = out.decode('utf-8')
return (rc, out)
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