summaryrefslogtreecommitdiffstats
path: root/bitbake/lib/bb/data_smart.py
blob: 5fdfeee2c721d03efd9995544a3c27d3d0cd0e81 (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
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
# ex:ts=4:sw=4:sts=4:et
# -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
"""
BitBake Smart Dictionary Implementation

Functions for interacting with the data structure used by the
BitBake build tools.

"""

# Copyright (C) 2003, 2004  Chris Larson
# Copyright (C) 2004, 2005  Seb Frankengul
# Copyright (C) 2005, 2006  Holger Hans Peter Freyther
# Copyright (C) 2005        Uli Luckas
# Copyright (C) 2005        ROAD GmbH
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
# Based on functions from the base bb module, Copyright 2003 Holger Schurig

import copy, re
from collections import MutableMapping
import logging
import hashlib
import bb, bb.codeparser
from bb   import utils
from bb.COW  import COWDictBase

logger = logging.getLogger("BitBake.Data")

__setvar_keyword__ = ["_append", "_prepend"]
__setvar_regexp__ = re.compile('(?P<base>.*?)(?P<keyword>_append|_prepend)(_(?P<add>.*))?$')
__expand_var_regexp__ = re.compile(r"\${[^{}]+}")
__expand_python_regexp__ = re.compile(r"\${@.+?}")


class VariableParse:
    def __init__(self, varname, d, val = None):
        self.varname = varname
        self.d = d
        self.value = val

        self.references = set()
        self.execs = set()

    def var_sub(self, match):
            key = match.group()[2:-1]
            if self.varname and key:
                if self.varname == key:
                    raise Exception("variable %s references itself!" % self.varname)
            var = self.d.getVar(key, True)
            if var is not None:
                self.references.add(key)
                return var
            else:
                return match.group()

    def python_sub(self, match):
            code = match.group()[3:-1]
            codeobj = compile(code.strip(), self.varname or "<expansion>", "eval")

            parser = bb.codeparser.PythonParser(self.varname, logger)
            parser.parse_python(code)
            if self.varname:
                vardeps = self.d.getVarFlag(self.varname, "vardeps", True)
                if vardeps is None:
                    parser.log.flush()
            else:
                parser.log.flush()
            self.references |= parser.references
            self.execs |= parser.execs

            value = utils.better_eval(codeobj, DataContext(self.d))
            return str(value)


class DataContext(dict):
    def __init__(self, metadata, **kwargs):
        self.metadata = metadata
        dict.__init__(self, **kwargs)
        self['d'] = metadata

    def __missing__(self, key):
        value = self.metadata.getVar(key, True)
        if value is None or self.metadata.getVarFlag(key, 'func'):
            raise KeyError(key)
        else:
            return value

class ExpansionError(Exception):
    def __init__(self, varname, expression, exception):
        self.expression = expression
        self.variablename = varname
        self.exception = exception
        if varname:
            if expression:
                self.msg = "Failure expanding variable %s, expression was %s which triggered exception %s: %s" % (varname, expression, type(exception).__name__, exception)
            else:
                self.msg = "Failure expanding variable %s: %s: %s" % (varname, type(exception).__name__, exception)
        else:
            self.msg = "Failure expanding expression %s which triggered exception %s: %s" % (expression, type(exception).__name__, exception)
        Exception.__init__(self, self.msg)
        self.args = (varname, expression, exception)
    def __str__(self):
        return self.msg

class IncludeHistory(object):
    def __init__(self, parent = None, filename = '[TOP LEVEL]'):
        self.parent = parent
        self.filename = filename
        self.children = []
        self.current = self

    def copy(self):
        new = IncludeHistory(self.parent, self.filename)
        for c in self.children:
            new.children.append(c)
        return new

    def include(self, filename):
        newfile = IncludeHistory(self.current, filename)
        self.current.children.append(newfile)
        self.current = newfile
        return self

    def __enter__(self):
        pass

    def __exit__(self, a, b, c):
        if self.current.parent:
            self.current = self.current.parent
        else:
            bb.warn("Include log: Tried to finish '%s' at top level." % filename)
        return False

    def emit(self, o, level = 0):
        """Emit an include history file, and its children."""
        if level:
            spaces = "  " * (level - 1)
            o.write("# %s%s" % (spaces, self.filename))
            if len(self.children) > 0:
                o.write(" includes:")
        else:
            o.write("#\n# INCLUDE HISTORY:\n#")
        level = level + 1
        for child in self.children:
            o.write("\n")
            child.emit(o, level)

class DataSmart(MutableMapping):
    def __init__(self, special = COWDictBase.copy(), seen = COWDictBase.copy() ):
        self.dict = {}

        self.inchistory = IncludeHistory()

        # cookie monster tribute
        self._special_values = special
        self._seen_overrides = seen

        self.expand_cache = {}

    def expandWithRefs(self, s, varname):

        if not isinstance(s, basestring): # sanity check
            return VariableParse(varname, self, s)

        if varname and varname in self.expand_cache:
            return self.expand_cache[varname]

        varparse = VariableParse(varname, self)

        while s.find('${') != -1:
            olds = s
            try:
                s = __expand_var_regexp__.sub(varparse.var_sub, s)
                s = __expand_python_regexp__.sub(varparse.python_sub, s)
                if s == olds:
                    break
            except ExpansionError:
                raise
            except bb.parse.SkipPackage:
                raise
            except Exception as exc:
                raise ExpansionError(varname, s, exc)

        varparse.value = s

        if varname:
            self.expand_cache[varname] = varparse

        return varparse

    def expand(self, s, varname = None):
        return self.expandWithRefs(s, varname).value


    def finalize(self):
        """Performs final steps upon the datastore, including application of overrides"""

        overrides = (self.getVar("OVERRIDES", True) or "").split(":") or []

        #
        # Well let us see what breaks here. We used to iterate
        # over each variable and apply the override and then
        # do the line expanding.
        # If we have bad luck - which we will have - the keys
        # where in some order that is so important for this
        # method which we don't have anymore.
        # Anyway we will fix that and write test cases this
        # time.

        #
        # First we apply all overrides
        # Then  we will handle _append and _prepend
        #

        for o in overrides:
            # calculate '_'+override
            l = len(o) + 1

            # see if one should even try
            if o not in self._seen_overrides:
                continue

            vars = self._seen_overrides[o].copy()
            for var in vars:
                name = var[:-l]
                try:
                    self.setVar(name, self.getVar(var, False))
                    self.delVar(var)
                except Exception:
                    logger.info("Untracked delVar")

        # now on to the appends and prepends
        for op in __setvar_keyword__:
            if op in self._special_values:
                appends = self._special_values[op] or []
                for append in appends:
                    keep = []
                    for (a, o) in self.getVarFlag(append, op) or []:
                        match = True
                        if o:
                            for o2 in o.split("_"):
                                if not o2 in overrides:
                                    match = False
                        if not match:
                            keep.append((a ,o))
                            continue

                        if op == "_append":
                            sval = self.getVar(append, False) or ""
                            sval += a
                            self.setVar(append, sval)
                        elif op == "_prepend":
                            sval = a + (self.getVar(append, False) or "")
                            self.setVar(append, sval)

                    # We save overrides that may be applied at some later stage
                    if keep:
                        self.setVarFlag(append, op, keep)
                    else:
                        self.delVarFlag(append, op)

    def initVar(self, var):
        self.expand_cache = {}
        if not var in self.dict:
            self.dict[var] = {}

    def _findVar(self, var):
        dest = self.dict
        while dest:
            if var in dest:
                return dest[var]

            if "_data" not in dest:
                break
            dest = dest["_data"]

    def _makeShadowCopy(self, var):
        if var in self.dict:
            return

        local_var = self._findVar(var)

        if local_var:
            self.dict[var] = copy.copy(local_var)
        else:
            self.initVar(var)

    def setVar(self, var, value):
        self.expand_cache = {}
        match  = __setvar_regexp__.match(var)
        if match and match.group("keyword") in __setvar_keyword__:
            base = match.group('base')
            keyword = match.group("keyword")
            override = match.group('add')
            l = self.getVarFlag(base, keyword) or []
            l.append([value, override])
            self.setVarFlag(base, keyword, l)

            # todo make sure keyword is not __doc__ or __module__
            # pay the cookie monster
            try:
                self._special_values[keyword].add( base )
            except KeyError:
                self._special_values[keyword] = set()
                self._special_values[keyword].add( base )

            return

        if not var in self.dict:
            self._makeShadowCopy(var)

        # more cookies for the cookie monster
        if '_' in var:
            override = var[var.rfind('_')+1:]
            if len(override) > 0:
                if override not in self._seen_overrides:
                    self._seen_overrides[override] = set()
                self._seen_overrides[override].add( var )

        # setting var
        self.dict[var]["_content"] = value

    def getVar(self, var, expand=False, noweakdefault=False):
        value = self.getVarFlag(var, "_content", False, noweakdefault)

        # Call expand() separately to make use of the expand cache
        if expand and value:
            return self.expand(value, var)
        return value

    def renameVar(self, key, newkey):
        """
        Rename the variable key to newkey
        """
        val = self.getVar(key, 0)
        if val is not None:
            self.setVar(newkey, val)

        for i in ('_append', '_prepend'):
            src = self.getVarFlag(key, i)
            if src is None:
                continue

            dest = self.getVarFlag(newkey, i) or []
            dest.extend(src)
            self.setVarFlag(newkey, i, dest)

            if i in self._special_values and key in self._special_values[i]:
                self._special_values[i].remove(key)
                self._special_values[i].add(newkey)

        self.delVar(key)

    def appendVar(self, key, value):
        value = (self.getVar(key, False) or "") + value
        self.setVar(key, value)

    def prependVar(self, key, value):
        value = value + (self.getVar(key, False) or "")
        self.setVar(key, value)

    def delVar(self, var):
        self.expand_cache = {}
        self.dict[var] = {}
        if '_' in var:
            override = var[var.rfind('_')+1:]
            if override and override in self._seen_overrides and var in self._seen_overrides[override]:
                self._seen_overrides[override].remove(var)

    def setVarFlag(self, var, flag, flagvalue):
        if not var in self.dict:
            self._makeShadowCopy(var)
        self.dict[var][flag] = flagvalue

    def getVarFlag(self, var, flag, expand=False, noweakdefault=False):
        local_var = self._findVar(var)
        value = None
        if local_var:
            if flag in local_var:
                value = copy.copy(local_var[flag])
            elif flag == "_content" and "defaultval" in local_var and not noweakdefault:
                value = copy.copy(local_var["defaultval"])
        if expand and value:
            value = self.expand(value, None)
        return value

    def delVarFlag(self, var, flag):
        local_var = self._findVar(var)
        if not local_var:
            return
        if not var in self.dict:
            self._makeShadowCopy(var)

        if var in self.dict and flag in self.dict[var]:
            del self.dict[var][flag]

    def appendVarFlag(self, key, flag, value):
        value = (self.getVarFlag(key, flag, False) or "") + value
        self.setVarFlag(key, flag, value)

    def prependVarFlag(self, key, flag, value):
        value = value + (self.getVarFlag(key, flag, False) or "")
        self.setVarFlag(key, flag, value)

    def setVarFlags(self, var, flags):
        if not var in self.dict:
            self._makeShadowCopy(var)

        for i in flags:
            if i == "_content":
                continue
            self.dict[var][i] = flags[i]

    def getVarFlags(self, var):
        local_var = self._findVar(var)
        flags = {}

        if local_var:
            for i in local_var:
                if i.startswith("_"):
                    continue
                flags[i] = local_var[i]

        if len(flags) == 0:
            return None
        return flags


    def delVarFlags(self, var):
        if not var in self.dict:
            self._makeShadowCopy(var)

        if var in self.dict:
            content = None

            # try to save the content
            if "_content" in self.dict[var]:
                content  = self.dict[var]["_content"]
                self.dict[var]            = {}
                self.dict[var]["_content"] = content
            else:
                del self.dict[var]


    def createCopy(self):
        """
        Create a copy of self by setting _data to self
        """
        # we really want this to be a DataSmart...
        data = DataSmart(seen=self._seen_overrides.copy(), special=self._special_values.copy())
        data.dict["_data"] = self.dict
        data.inchistory = self.inchistory.copy()

        return data

    def expandVarref(self, variable, parents=False):
        """Find all references to variable in the data and expand it
           in place, optionally descending to parent datastores."""

        if parents:
            keys = iter(self)
        else:
            keys = self.localkeys()

        ref = '${%s}' % variable
        value = self.getVar(variable, False)
        for key in keys:
            referrervalue = self.getVar(key, False)
            if referrervalue and ref in referrervalue:
                self.setVar(key, referrervalue.replace(ref, value))

    def localkeys(self):
        for key in self.dict:
            if key != '_data':
                yield key

    def __iter__(self):
        def keylist(d):        
            klist = set()
            for key in d:
                if key == "_data":
                    continue
                if not d[key]:
                    continue
                klist.add(key)

            if "_data" in d:
                klist |= keylist(d["_data"])

            return klist

        for k in keylist(self.dict):
             yield k

    def __len__(self):
        return len(frozenset(self))

    def __getitem__(self, item):
        value = self.getVar(item, False)
        if value is None:
            raise KeyError(item)
        else:
            return value

    def __setitem__(self, var, value):
        self.setVar(var, value)

    def __delitem__(self, var):
        self.delVar(var)

    def get_hash(self):
        data = {}
        d = self.createCopy()
        bb.data.expandKeys(d)
        bb.data.update_data(d)

        config_whitelist = set((d.getVar("BB_HASHCONFIG_WHITELIST", True) or "").split())
        keys = set(key for key in iter(d) if not key.startswith("__"))
        for key in keys:
            if key in config_whitelist:
                continue
            value = d.getVar(key, False) or ""
            data.update({key:value})

        data_str = str([(k, data[k]) for k in sorted(data.keys())])
        return hashlib.md5(data_str).hexdigest()