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 .. seealso:: Overview Diagram linked to from doc main page
34 .. codeauthor:: Intra2net
43 log = logging.getLogger("pyi2ncommon.cnfvar.binary")
45 #: default get_cnf binary
46 BIN_GET_CNF = "/usr/intranator/bin/get_cnf"
47 #: default set_cnf binary
48 BIN_SET_CNF = "/usr/intranator/bin/set_cnf"
49 #: encoding used by the get_cnf and set_cnf binaries
54 """Provide wrappers around the multiple binaries to handle the CNF store."""
57 def run_cmd(cls, cmd, cmd_input=None, ignore_errors=False, timeout=60, encoding=ENCODING):
59 Run commands on the local machine with input via stdin.
61 :param cmd: command to run
62 :type cmd: str or list
63 :param str cmd_input: input to give to the command
64 :param bool ignore_errors: whether to ignore the exit code or raise if not zero
65 :param int timeout: amount of seconds to wait for the command to complete
66 :param str encoding: encoding to use (pass latin1 when not working with JSON)
67 :returns: command result
68 :rtype: :py:class:`subprocess.CompletedProcess`
70 if isinstance(cmd, str):
71 cmd = shlex.split(cmd)
73 log.debug("Running binary cmd `%s` with input:\n%s",
74 ' '.join(cmd), cmd_input)
75 retval = subprocess.run(cmd, input=cmd_input, check=not ignore_errors,
76 capture_output=True, encoding=encoding, timeout=timeout)
77 log.debug("Command exited with \n"
80 "\tstdout=%s", retval.returncode, retval.stderr, retval.stdout)
84 def get_cnf(cls, name=None, instance=None, no_children=False,
87 Wrapper around the `get_cnf` binary.
89 :param str name: optional name of the CNFs to get
90 :param instance: CNF instance
91 :type instance: str or int
92 :param bool no_children: whether to return child CNFs
93 :param bool as_json: whether to return a JSON-formatted string
94 :returns: output of the tool
97 .. note:: being a wrapper, this function does not do anything extra
98 like checking if arnied is running or waiting for generate.
100 if name is None and instance is not None:
101 raise ValueError("cannot pass `instance` without a `name`")
103 if isinstance(instance, str):
104 instance = int(instance) # validate
105 elif instance is not None and not isinstance(instance, int):
106 raise TypeError(f"`instance` is of wrong type {type(instance)}")
108 # make sure 0 instance cnfvars like e.g. NICs can also be filtered by instance
109 cmd = f"{BIN_GET_CNF} {name or ''} {instance if instance is not None else ''}"
113 cmd += " --no-childs"
118 # TODO: should error handling be improved so error messages
119 # from the binary are converted into specific exceptions types?
120 output = cls.run_cmd(cmd, encoding=encoding).stdout.strip()
121 # remove escape chars (such as '//')
122 output = output.replace('\\"', '"')
126 def set_cnf(cls, input_str=None, input_file=None, delete=False,
127 delete_file=False, as_json=False, fix_problems=False, **kwargs):
129 Wrapper around the `set_cnf` binary.
131 :param str input_str: string to send as input to the binary
132 :param str input_file: path to a file to pass to the binary
133 :param bool delete: whether to delete the corresponding CNFs
134 :param bool delete_file: whether to delete the file passed as input
135 :param bool as_json: whether to interpret input as JSON
136 :param bool fix_problems: whether to automatically fix errors in the vars
137 :param kwargs: extra arguments to pass to the binary - underscores are
138 replaced by dash, e.g. set_cnf(..., enable_queue=True)
139 becomes `/usr/intranator/bin/set_cnf --enable-queue`
140 :raises: :py:class:`SetCnfException` in case the binary errors out
142 .. note:: being a wrapper, this function does not do anything extra
143 like checking if arnied is running or waiting for generate.
145 if input_str is None and input_file is None:
146 raise ValueError("Need to pass either a string or a file")
148 if delete_file is True and input_file is None:
149 raise ValueError("Cannot delete an unspecified file")
151 cmd = f"{BIN_SET_CNF}"
159 cmd += " --delete-file"
161 cmd += " --fix-problems"
163 for k, v in kwargs.items():
165 k = "-".join(k.split("_"))
169 cmd += f" {input_file}"
172 cls.run_cmd(cmd, cmd_input=input_str, encoding=encoding)
173 except subprocess.CalledProcessError as ex:
174 # clean up the error message
175 ex.stderr = cls._clean_set_cnf_error(ex.stderr)
179 def _clean_set_cnf_error(cls, err):
181 Turn the error from the set_cnf binary into a more readable message.
183 :param str err: error message from the binary
184 :returns: the clean error message
187 Keep only offending lines and strip out HTML tags.
189 def get_error_lines(output_lines):
190 for cnfline in output_lines:
195 last_chr = buffer[-1] if buffer else None
196 # this is a literal (unescaped) quote
197 if c == "\"" and last_chr != "\\":
200 if c == " " and not quoted:
211 lineno, name, instance, parent, value, exit_code, error = parts
213 # the binary outputs HTML strings
214 error = html.unescape(error)
215 # replace line breaks for readability
216 error = re.sub(r"(<br\s*>)+", " ", error)
218 error = re.sub(r"<[^<]+?>", "", error)
221 message = f"`` {lineno} {name},{instance}: {value} ``"
223 message = f"`` {lineno} ({parent}) {name},{instance}: {value} ``"
224 yield f"Error in {message}: {error} (code={exit_code})"
226 lines = err.splitlines()
230 if "fatal errors in changes" not in lines[0]:
233 errors = list(get_error_lines(lines[1:]))
234 return "\n".join(errors)