1 # The software in this package is distributed under the GNU General
2 # Public License version 2 (with a special exception described below).
4 # A copy of GNU General Public License (GPL) is included in this distribution,
5 # in the file COPYING.GPL.
7 # As a special exception, if other files instantiate templates or use macros
8 # or inline functions from this file, or you compile this file and link it
9 # with other works to produce a work based on this file, this file
10 # does not by itself cause the resulting work to be covered
11 # by the GNU General Public License.
13 # However the source code for this file must still be made available
14 # in accordance with section (3) of the GNU General Public License.
16 # This exception does not invalidate any other reasons why a work based
17 # on this file might be covered by the GNU General Public License.
19 # Copyright (c) 2016-2022 Intra2net AG <info@intra2net.com>
22 binary: wrappers around binaries that work with the CNF store.
25 - CnfBinary: stateless class that can be used to invoke the different binaries
26 in a Python-friendly way.
28 .. note:: It is written as a class on purpose for it to be easily extended to
29 support invoking non-local binaries, but methods are all class methods since
30 the class is stateless.
32 .. codeauthor:: Intra2net
41 log = logging.getLogger("pyi2ncommon.cnfvar.store")
43 #: default get_cnf binary
44 BIN_GET_CNF = "/usr/intranator/bin/get_cnf"
45 #: default set_cnf binary
46 BIN_SET_CNF = "/usr/intranator/bin/set_cnf"
47 #: encoding used by the get_cnf and set_cnf binaries
51 class CnfBinary(object):
52 """Provide wrappers around the multiple binaries to handle the CNF store."""
55 def run_cmd(cls, cmd, cmd_input=None, ignore_errors=False, timeout=60, encoding=ENCODING):
57 Run commands on the local machine with input via stdin.
59 :param cmd: command to run
60 :type cmd: str or list
61 :param str cmd_input: input to give to the command
62 :param bool ignore_errors: whether to ignore the exit code or raise if not zero
63 :param int timeout: amount of seconds to wait for the command to complete
64 :param str encoding: encoding to use (pass latin1 when not working with JSON)
65 :returns: command result
66 :rtype: :py:class:`subprocess.CompletedProcess`
68 if isinstance(cmd, str):
69 cmd = shlex.split(cmd)
71 log.debug("Running binary cmd `%s` with input:\n%s",
72 ' '.join(cmd), cmd_input)
73 retval = subprocess.run(cmd, input=cmd_input, check=not ignore_errors,
74 capture_output=True, encoding=encoding, timeout=timeout)
75 log.debug("Command exited with \n"
78 "\tstdout=%s", retval.returncode, retval.stderr, retval.stdout)
82 def get_cnf(cls, name=None, instance=None, no_children=False,
85 Wrapper around the `get_cnf` binary.
87 :param str name: optional name of the CNFs to get
88 :param instance: CNF instance
89 :type instance: str or int
90 :param bool no_children: whether to return child CNFs
91 :param bool as_json: whether to return a JSON-formatted string
92 :returns: output of the tool
95 .. note:: being a wrapper, this function does not do anything extra
96 like checking if arnied is running or waiting for generate.
98 if name is None and instance is not None:
99 raise ValueError("cannot pass `instance` without a `name`")
101 if isinstance(instance, str):
102 instance = int(instance) # validate
103 elif instance is not None and not isinstance(instance, int):
104 raise TypeError(f"`instance` is of wrong type {type(instance)}")
106 cmd = f"{BIN_GET_CNF} {name or ''} {instance or ''}"
110 cmd += " --no-childs"
115 # TODO: should error handling be improved so error messages
116 # from the binary are converted into specific exceptions types?
117 output = cls.run_cmd(cmd, encoding=encoding).stdout.strip()
118 # remove escape chars (such as '//')
119 output = output.replace('\\"', '"')
123 def set_cnf(cls, input_str=None, input_file=None, delete=False,
124 delete_file=False, as_json=False, fix_problems=False, **kwargs):
126 Wrapper around the `set_cnf` binary.
128 :param str input_str: string to send as input to the binary
129 :param str input_file: path to a file to pass to the binary
130 :param bool delete: whether to delete the corresponding CNFs
131 :param bool delete_file: whether to delete the file passed as input
132 :param bool as_json: whether to interpret input as JSON
133 :param bool fix_problems: whether to automatically fix errors in the vars
134 :param kwargs: extra arguments to pass to the binary - underscores are
135 replaced by dash, e.g. set_cnf(..., enable_queue=True)
136 becomes `/usr/intranator/bin/set_cnf --enable-queue`
137 :raises: :py:class:`SetCnfException` in case the binary errors out
139 .. note:: being a wrapper, this function does not do anything extra
140 like checking if arnied is running or waiting for generate.
142 if input_str is None and input_file is None:
143 raise ValueError("Need to pass either a string or a file")
145 if delete_file is True and input_file is None:
146 raise ValueError("Cannot delete an unspecified file")
148 cmd = f"{BIN_SET_CNF}"
156 cmd += " --delete-file"
158 cmd += " --fix-problems"
160 for k, v in kwargs.items():
162 k = "-".join(k.split("_"))
166 cmd += f" {input_file}"
169 cls.run_cmd(cmd, cmd_input=input_str, encoding=encoding)
170 except subprocess.CalledProcessError as ex:
171 # clean up the error message
172 ex.stderr = cls._clean_set_cnf_error(ex.stderr)
176 def _clean_set_cnf_error(cls, err):
178 Turn the error from the set_cnf binary into a more readable message.
180 :param str err: error message from the binary
181 :returns: the clean error message
184 Keep only offending lines and strip out HTML tags.
186 def get_error_lines(output_lines):
187 for cnfline in output_lines:
192 last_chr = buffer[-1] if buffer else None
193 # this is a literal (unescaped) quote
194 if c == "\"" and last_chr != "\\":
197 if c == " " and not quoted:
208 lineno, name, instance, parent, value, exit_code, error = parts
210 # the binary outputs HTML strings
211 error = html.unescape(error)
212 # replace line breaks for readability
213 error = re.sub(r"(<br\s*>)+", " ", error)
215 error = re.sub(r"<[^<]+?>", "", error)
218 message = f"`` {lineno} {name},{instance}: {value} ``"
220 message = f"`` {lineno} ({parent}) {name},{instance}: {value} ``"
221 yield f"Error in {message}: {error} (code={exit_code})"
223 lines = err.splitlines()
227 if "fatal errors in changes" not in lines[0]:
230 errors = list(get_error_lines(lines[1:]))
231 return "\n".join(errors)