summaryrefslogtreecommitdiff
path: root/scripts/build-command-templates
blob: 36929abb2365cc29ce92bc0a8b3f963600d1c587 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
#!/usr/bin/env python3
#
#    build-command-template: converts new style command definitions in XML
#      to the old style (bunch of dirs and node.def's) command templates
#
#    Copyright (C) 2017 VyOS maintainers <maintainers@vyos.net>
#
#    This library is free software; you can redistribute it and/or
#    modify it under the terms of the GNU Lesser General Public
#    License as published by the Free Software Foundation; either
#    version 2.1 of the License, or (at your option) any later version.
#
#    This library 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
#    Lesser General Public License for more details.
#
#    You should have received a copy of the GNU Lesser General Public
#    License along with this library; if not, write to the Free Software
#    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301
#    USA

import sys
import os
import argparse
import copy
import functools

from lxml import etree as ET
from textwrap import fill

# Defaults

#validator_dir = "/usr/libexec/vyos/validators"
validator_dir = "${vyos_validators_dir}"
default_constraint_err_msg = "Invalid value"


## Get arguments

parser = argparse.ArgumentParser(description='Converts new-style XML interface definitions to old-style command templates')
parser.add_argument('--debug', help='Enable debug information output', action='store_true')
parser.add_argument('INPUT_FILE', type=str, help="XML interface definition file")
parser.add_argument('SCHEMA_FILE', type=str, help="RelaxNG schema file")
parser.add_argument('OUTPUT_DIR', type=str, help="Output directory")

args = parser.parse_args()

input_file = args.INPUT_FILE
schema_file = args.SCHEMA_FILE
output_dir = args.OUTPUT_DIR
debug = args.debug

#debug = True

## Load and validate the inputs

try:
    xml = ET.parse(input_file)
except Exception as e:
    print("Failed to load interface definition file {0}".format(input_file))
    print(e)
    sys.exit(1)

try:
    relaxng_xml = ET.parse(schema_file)
    validator = ET.RelaxNG(relaxng_xml)

    if not validator.validate(xml):
        print(validator.error_log)
        print("Interface definition file {0} does not match the schema!".format(input_file))
        sys.exit(1)
except Exception as e:
    print("Failed to load the XML schema {0}".format(schema_file))
    print(e)
    sys.exit(1)

if not os.access(output_dir, os.W_OK):
    print("The output directory {0} is not writeable".format(output_dir))
    sys.exit(1)

## If we got this far, everything must be ok and we can convert the file

def make_path(l):
    path = functools.reduce(os.path.join, l)
    if debug:
        print(path)
    return path

def collect_validators(ve):
    regexes = []
    regex_elements = ve.findall("regex")
    if regex_elements is not None:
        regexes = list(map(lambda e: e.text.strip().replace('\\','\\\\'), regex_elements))
    if "" in regexes:
        print("Warning: empty regex, node will be accepting any value")

    validator_elements = ve.findall("validator")
    validators = []
    if validator_elements is not None:
        for v in validator_elements:
            v_name = os.path.join(validator_dir, v.get("name"))

            # XXX: lxml returns None for empty arguments
            v_argument = None
            try:
                v_argument = v.get("argument")
            except:
                pass
            if v_argument is None:
                v_argument = ""

            validators.append("{0} {1}".format(v_name, v_argument))


    regex_args = " ".join(map(lambda s: "--regex \\\'{0}\\\'".format(s), regexes))
    validator_args = " ".join(map(lambda s: "--exec \\\"{0}\\\"".format(s), validators))

    return regex_args + " " + validator_args

def get_properties(p, default=None):
    props = {}

    if p is None:
        return props

    # Get the help string
    try:
        help = p.find("help").text
        if default != None:
            # DNS forwarding for instance has multiple defaults - specified as whitespace separated list
            tmp = ', '.join(default.text.split())
            help += f' (default: {tmp})'
        help = fill(help, width=64, subsequent_indent='\t\t\t')
        props["help"] = help
    except:
        pass

    # Get value help strings
    try:
        vhe = p.findall("valueHelp")
        vh = []
        for v in vhe:
            format = v.find("format").text
            description = v.find("description").text
            if default != None and default.text == format:
                description += f' (default)'
            # Is no description was specified, keep it empty
            if not description: description = ''
            vh.append( (format, description) )
        props["val_help"] = vh
    except:
        props["val_help"] = []

    # Get the constraint and constraintGroup statements

    error_msg = default_constraint_err_msg
    # Get the error message if it's there
    try:
        error_msg = p.find("constraintErrorMessage").text
    except:
        pass

    vce = p.find("constraint")

    distinct_validator_string = ""
    if vce is not None:
        # The old backend doesn't support multiple validators in OR mode
        # so we emulate it

        distinct_validator_string = collect_validators(vce)

    vcge = p.findall("constraintGroup")

    group_validator_string = ""
    if len(vcge):
        for vcg in vcge:
            group_validator_string = group_validator_string + " --grp " + collect_validators(vcg)

    if vce is not None or len(vcge):
        validator_script = '${vyos_libexec_dir}/validate-value'
        validator_string = "exec \"{0} {1} {2} --value \\\'$VAR(@)\\\'\"; \"{3}\"".format(validator_script, distinct_validator_string, group_validator_string, error_msg)

        props["constraint"] = validator_string

    # Get the completion help strings
    try:
        che = p.findall("completionHelp")
        ch = ""
        for c in che:
            scripts = c.findall("script")
            paths = c.findall("path")
            lists = c.findall("list")

            # Current backend doesn't support multiple allowed: tags
            # so we get to emulate it
            comp_exprs = []
            for i in lists:
                comp_exprs.append(f'echo "{i.text}"')
            for i in paths:
                comp_exprs.append(f'/bin/cli-shell-api listNodes {i.text}')
            for i in scripts:
                comp_exprs.append(f'sh -c "{i.text}"')
            comp_help = ' && echo " " && '.join(comp_exprs)
            props["comp_help"] = comp_help
    except:
        props["comp_help"] = []

    # Get priority
    try:
        props["priority"] = p.find("priority").text
    except:
        pass

    # Get "multi"
    if p.find("multi") is not None:
        props["multi"] = True

    # Get "valueless"
    if p.find("valueless") is not None:
        props["valueless"] = True

    return props

def make_node_def(props):
    # XXX: replace with a template processor if it grows
    #      out of control

    node_def = ""

    if "tag" in props:
        node_def += "tag:\n"

    if "multi" in props:
        node_def += "multi:\n"

    if "type" in props:
        # Will always be txt in practice if it's set
        node_def += "type: {0}\n".format(props["type"])

    if "priority" in props:
        node_def += "priority: {0}\n".format(props["priority"])

    if "help" in props:
        node_def += "help: {0}\n".format(props["help"])

    if "val_help" in props:
        for v in props["val_help"]:
            node_def += "val_help: {0}; {1}\n".format(v[0], v[1])

    if "comp_help" in props:
        node_def += "allowed: {0}\n".format(props["comp_help"])

    if "constraint" in props:
        node_def += "syntax:expression: {0}\n".format(props["constraint"])

    shim = '${vyshim}'

    if "owner" in props:
        if "tag" in props:
            node_def += "end: sudo sh -c \"{1} VYOS_TAGNODE_VALUE='$VAR(@)' {0}\"\n".format(props["owner"], shim)
        else:
            node_def += "end: sudo sh -c \"{1} {0}\"\n".format(props["owner"], shim)

    if debug:
        print("The contents of the node.def file:\n", node_def)

    return node_def

def process_node(n, tmpl_dir):
    # Avoid mangling the path from the outer call
    my_tmpl_dir = copy.copy(tmpl_dir)

    props_elem = n.find("properties")
    children = n.find("children")

    name = n.get("name")
    owner = n.get("owner")
    node_type = n.tag

    my_tmpl_dir.append(name)

    if debug:
        print("Name of the node: {0}. Created directory: {1}\n".format(name, "/".join(my_tmpl_dir)), end="")
    os.makedirs(make_path(my_tmpl_dir), exist_ok=True)

    props = get_properties(props_elem, n.find("defaultValue"))
    if owner:
        props["owner"] = owner
        # <priority> tag is mandatory if the parent node has an owner
        if "priority" not in props:
            raise ValueError(
                f"<priority> tag should be set for the node <{name}> path '{' '.join(my_tmpl_dir[1:])}'"
            )

    # Type should not be set for non-tag, non-leaf nodes
    # For non-valueless leaf nodes, set the type to txt: to make them have some type,
    # actual value validation is handled by constraints translated to syntax:expression:
    if node_type != "node":
        if "valueless" not in props.keys():
            props["type"] = "txt"
    if node_type == "tagNode":
        props["tag"] = "True"

    if node_type != "leafNode":
        if "multi" in props:
            raise ValueError("<multi/> tag is only allowed in <leafNode>")
        if "valueless" in props:
            raise ValueError("<valueless/> is only allowed in <leafNode>")

    nodedef_path = os.path.join(make_path(my_tmpl_dir), "node.def")

    # Only create the "node.def" file if it exists but is empty, or if it does
    # not exist at all. An empty node.def file could be generated by XML paths
    # that derive from one another bot having a common base structure like
    # "protocols static"
    if not os.path.exists(nodedef_path) or os.path.getsize(nodedef_path) == 0:
        with open(nodedef_path, "w") as f:
            f.write(make_node_def(props))

    if node_type == "node":
        inner_nodes = children.iterfind("*")
        for inner_n in inner_nodes:
            process_node(inner_n, my_tmpl_dir)
    if node_type == "tagNode":
        my_tmpl_dir.append("node.tag")
        if debug:
            print("Created path for the tagNode:", end="")
        os.makedirs(make_path(my_tmpl_dir), exist_ok=True)
        inner_nodes = children.iterfind("*")
        for inner_n in inner_nodes:
            process_node(inner_n, my_tmpl_dir)
    else:
        # This is a leaf node
        pass


root = xml.getroot()

nodes = root.iterfind("*")
for n in nodes:
    if n.tag == "syntaxVersion":
        continue
    try:
        process_node(n, [output_dir])
    except ValueError as e:
        print(e)
        sys.exit(1)