summaryrefslogtreecommitdiffstats
path: root/bitbake/lib/bb/cache.py
blob: d30d57d33b8a86945fa1ca7d43a3f8995c0cadd4 (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
# ex:ts=4:sw=4:sts=4:et
# -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
#
# BitBake 'Event' implementation
#
# Caching of bitbake variables before task execution

# Copyright (C) 2006        Richard Purdie

# but small sections based on code from bin/bitbake:
# Copyright (C) 2003, 2004  Chris Larson
# Copyright (C) 2003, 2004  Phil Blundell
# Copyright (C) 2003 - 2005 Michael 'Mickey' Lauer
# Copyright (C) 2005        Holger Hans Peter Freyther
# 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.


import os, re
import bb.data
import bb.utils

try:
    import cPickle as pickle
except ImportError:
    import pickle
    bb.msg.note(1, bb.msg.domain.Cache, "Importing cPickle failed. Falling back to a very slow implementation.")

__cache_version__ = "130"

class Cache:
    """
    BitBake Cache implementation
    """
    def __init__(self, cooker):


        self.cachedir = bb.data.getVar("CACHE", cooker.configuration.data, True)
        self.clean = {}
        self.checked = {}
        self.depends_cache = {}
        self.data = None
        self.data_fn = None
        self.cacheclean = True

        if self.cachedir in [None, '']:
            self.has_cache = False
            bb.msg.note(1, bb.msg.domain.Cache, "Not using a cache. Set CACHE = <directory> to enable.")
            return

        self.has_cache = True
        self.cachefile = os.path.join(self.cachedir,"bb_cache.dat")

        bb.msg.debug(1, bb.msg.domain.Cache, "Using cache in '%s'" % self.cachedir)
        try:
            os.stat( self.cachedir )
        except OSError:
            bb.mkdirhier( self.cachedir )

        # If any of configuration.data's dependencies are newer than the
        # cache there isn't even any point in loading it...
        newest_mtime = 0
        deps = bb.data.getVar("__depends", cooker.configuration.data, True)
        for f,old_mtime in deps:
            if old_mtime > newest_mtime:
                newest_mtime = old_mtime

        if bb.parse.cached_mtime_noerror(self.cachefile) >= newest_mtime:
            try:
                p = pickle.Unpickler(file(self.cachefile, "rb"))
                self.depends_cache, version_data = p.load()
                if version_data['CACHE_VER'] != __cache_version__:
                    raise ValueError, 'Cache Version Mismatch'
                if version_data['BITBAKE_VER'] != bb.__version__:
                    raise ValueError, 'Bitbake Version Mismatch'
            except EOFError:
                bb.msg.note(1, bb.msg.domain.Cache, "Truncated cache found, rebuilding...")
                self.depends_cache = {}
            except:
                bb.msg.note(1, bb.msg.domain.Cache, "Invalid cache found, rebuilding...")
                self.depends_cache = {}
        else:
            try:
                os.stat( self.cachefile )
                bb.msg.note(1, bb.msg.domain.Cache, "Out of date cache found, rebuilding...")
            except OSError:
                pass

    def getVar(self, var, fn, exp = 0):
        """
        Gets the value of a variable
        (similar to getVar in the data class)
        
        There are two scenarios:
          1. We have cached data - serve from depends_cache[fn]
          2. We're learning what data to cache - serve from data 
             backend but add a copy of the data to the cache.
        """
        if fn in self.clean:
            return self.depends_cache[fn][var]

        if not fn in self.depends_cache:
            self.depends_cache[fn] = {}

        if fn != self.data_fn:
            # We're trying to access data in the cache which doesn't exist
            # yet setData hasn't been called to setup the right access. Very bad.
            bb.msg.error(bb.msg.domain.Cache, "Parsing error data_fn %s and fn %s don't match" % (self.data_fn, fn))

        self.cacheclean = False
        result = bb.data.getVar(var, self.data, exp)
        self.depends_cache[fn][var] = result
        return result

    def setData(self, virtualfn, fn, data):
        """
        Called to prime bb_cache ready to learn which variables to cache.
        Will be followed by calls to self.getVar which aren't cached
        but can be fulfilled from self.data.
        """
        self.data_fn = virtualfn
        self.data = data

        # Make sure __depends makes the depends_cache
        self.getVar("__depends", virtualfn, True)
        self.depends_cache[virtualfn]["CACHETIMESTAMP"] = bb.parse.cached_mtime(fn)

    def virtualfn2realfn(self, virtualfn):
        """
        Convert a virtual file name to a real one + the associated subclass keyword
        """

        fn = virtualfn
        cls = ""
        if virtualfn.startswith('virtual:'):
            cls = virtualfn.split(':', 2)[1]
            fn = virtualfn.replace('virtual:' + cls + ':', '')
        #bb.msg.debug(2, bb.msg.domain.Cache, "virtualfn2realfn %s to %s %s" % (virtualfn, fn, cls))
        return (fn, cls)

    def realfn2virtual(self, realfn, cls):
        """
        Convert a real filename + the associated subclass keyword to a virtual filename
        """
        if cls == "":
            #bb.msg.debug(2, bb.msg.domain.Cache, "realfn2virtual %s and '%s' to %s" % (realfn, cls, realfn))
            return realfn
        #bb.msg.debug(2, bb.msg.domain.Cache, "realfn2virtual %s and %s to %s" % (realfn, cls, "virtual:" + cls + ":" + realfn))
        return "virtual:" + cls + ":" + realfn

    def loadDataFull(self, virtualfn, cfgData):
        """
        Return a complete set of data for fn.
        To do this, we need to parse the file.
        """

        (fn, cls) = self.virtualfn2realfn(virtualfn)

        bb.msg.debug(1, bb.msg.domain.Cache, "Parsing %s (full)" % fn)

        bb_data, skipped = self.load_bbfile(fn, cfgData)
        if isinstance(bb_data, dict):
            return bb_data[cls]

        return bb_data

    def loadData(self, fn, cfgData, cacheData):
        """
        Load a subset of data for fn.
        If the cached data is valid we do nothing,
        To do this, we need to parse the file and set the system
        to record the variables accessed.
        Return the cache status and whether the file was skipped when parsed
        """
        if fn not in self.checked:
            self.cacheValidUpdate(fn)
        if self.cacheValid(fn):
            if "SKIPPED" in self.depends_cache[fn]:
                return True, True
            self.handle_data(fn, cacheData)
            multi = self.getVar('BBCLASSEXTEND', fn, True)
            if multi:
                for cls in multi.split():
                    virtualfn = self.realfn2virtual(fn, cls)
                    # Pretend we're clean so getVar works
                    self.clean[virtualfn] = ""
                    self.handle_data(virtualfn, cacheData)
            return True, False

        bb.msg.debug(1, bb.msg.domain.Cache, "Parsing %s" % fn)

        bb_data, skipped = self.load_bbfile(fn, cfgData)

        if skipped:
           if isinstance(bb_data, dict):
               self.setData(fn, fn, bb_data[""])
           else:
               self.setData(fn, fn, bb_data)
           return False, skipped

        if isinstance(bb_data, dict):
            for data in bb_data:
                virtualfn = self.realfn2virtual(fn, data)
                self.setData(virtualfn, fn, bb_data[data])
                self.handle_data(virtualfn, cacheData)
            return False, skipped

        self.setData(fn, fn, bb_data)
        self.handle_data(fn, cacheData)
        return False, skipped

    def cacheValid(self, fn):
        """
        Is the cache valid for fn?
        Fast version, no timestamps checked.
        """
        # Is cache enabled?
        if not self.has_cache:
            return False
        if fn in self.clean:
            return True
        return False

    def cacheValidUpdate(self, fn):
        """
        Is the cache valid for fn?
        Make thorough (slower) checks including timestamps.
        """
        # Is cache enabled?
        if not self.has_cache:
            return False

        self.checked[fn] = ""

        # Pretend we're clean so getVar works
        self.clean[fn] = ""

        # File isn't in depends_cache
        if not fn in self.depends_cache:
            bb.msg.debug(2, bb.msg.domain.Cache, "Cache: %s is not cached" % fn)
            self.remove(fn)
            return False

        mtime = bb.parse.cached_mtime_noerror(fn) 

        # Check file still exists
        if mtime == 0:
            bb.msg.debug(2, bb.msg.domain.Cache, "Cache: %s not longer exists" % fn)
            self.remove(fn)
            return False

        # Check the file's timestamp
        if mtime != self.getVar("CACHETIMESTAMP", fn, True):
            bb.msg.debug(2, bb.msg.domain.Cache, "Cache: %s changed" % fn)
            self.remove(fn)
            return False

        # Check dependencies are still valid
        depends = self.getVar("__depends", fn, True)
        if depends:
            for f,old_mtime in depends:
                fmtime = bb.parse.cached_mtime_noerror(f)
                # Check if file still exists
                if old_mtime != 0 and fmtime == 0:
                    self.remove(fn)
                    return False

                if (fmtime != old_mtime):
                    bb.msg.debug(2, bb.msg.domain.Cache, "Cache: %s's dependency %s changed" % (fn, f))
                    self.remove(fn)
                    return False

        #bb.msg.debug(2, bb.msg.domain.Cache, "Depends Cache: %s is clean" % fn)
        if not fn in self.clean:
            self.clean[fn] = ""

        return True

    def skip(self, fn):
        """
        Mark a fn as skipped
        Called from the parser
        """
        if not fn in self.depends_cache:
            self.depends_cache[fn] = {}
        self.depends_cache[fn]["SKIPPED"] = "1"

    def remove(self, fn):
        """
        Remove a fn from the cache
        Called from the parser in error cases
        """
        bb.msg.debug(1, bb.msg.domain.Cache, "Removing %s from cache" % fn)
        if fn in self.depends_cache:
            del self.depends_cache[fn]
        if fn in self.clean:
            del self.clean[fn]

    def sync(self):
        """
        Save the cache
        Called from the parser when complete (or exiting)
        """
        import copy

        if not self.has_cache:
            return

        if self.cacheclean:
            bb.msg.note(1, bb.msg.domain.Cache, "Cache is clean, not saving.")
            return

        version_data = {}
        version_data['CACHE_VER'] = __cache_version__
        version_data['BITBAKE_VER'] = bb.__version__

        cache_data = copy.deepcopy(self.depends_cache)
        for fn in self.depends_cache:
            if '__BB_DONT_CACHE' in self.depends_cache[fn] and self.depends_cache[fn]['__BB_DONT_CACHE']:
                bb.msg.debug(2, bb.msg.domain.Cache, "Not caching %s, marked as not cacheable" % fn)
                del cache_data[fn]
            elif 'PV' in self.depends_cache[fn] and 'SRCREVINACTION' in self.depends_cache[fn]['PV']:
                bb.msg.error(bb.msg.domain.Cache, "Not caching %s as it had SRCREVINACTION in PV. Please report this bug" % fn)
                del cache_data[fn]

        p = pickle.Pickler(file(self.cachefile, "wb" ), -1 )
        p.dump([cache_data, version_data])

    def mtime(self, cachefile):
        return bb.parse.cached_mtime_noerror(cachefile)

    def handle_data(self, file_name, cacheData):
        """
        Save data we need into the cache 
        """

        pn       = self.getVar('PN', file_name, True)
        pe       = self.getVar('PE', file_name, True) or "0"
        pv       = self.getVar('PV', file_name, True)
        if 'SRCREVINACTION' in pv:
            bb.note("Found SRCREVINACTION in PV (%s) or %s. Please report this bug." % (pv, file_name))
        pr       = self.getVar('PR', file_name, True)
        dp       = int(self.getVar('DEFAULT_PREFERENCE', file_name, True) or "0")
        depends   = bb.utils.explode_deps(self.getVar("DEPENDS", file_name, True) or "")
        packages  = (self.getVar('PACKAGES', file_name, True) or "").split()
        packages_dynamic = (self.getVar('PACKAGES_DYNAMIC', file_name, True) or "").split()
        rprovides = (self.getVar("RPROVIDES", file_name, True) or "").split()

        cacheData.task_deps[file_name] = self.getVar("_task_deps", file_name, True)

        # build PackageName to FileName lookup table
        if pn not in cacheData.pkg_pn:
            cacheData.pkg_pn[pn] = []
        cacheData.pkg_pn[pn].append(file_name)

        cacheData.stamp[file_name] = self.getVar('STAMP', file_name, True)

        # build FileName to PackageName lookup table
        cacheData.pkg_fn[file_name] = pn
        cacheData.pkg_pepvpr[file_name] = (pe,pv,pr)
        cacheData.pkg_dp[file_name] = dp

        provides = [pn]
        for provide in (self.getVar("PROVIDES", file_name, True) or "").split():
            if provide not in provides:
                provides.append(provide)

        # Build forward and reverse provider hashes
        # Forward: virtual -> [filenames]
        # Reverse: PN -> [virtuals]
        if pn not in cacheData.pn_provides:
            cacheData.pn_provides[pn] = []

        cacheData.fn_provides[file_name] = provides
        for provide in provides:
            if provide not in cacheData.providers:
                cacheData.providers[provide] = []
            cacheData.providers[provide].append(file_name)
            if not provide in cacheData.pn_provides[pn]:
                cacheData.pn_provides[pn].append(provide)

        cacheData.deps[file_name] = []
        for dep in depends:
            if not dep in cacheData.deps[file_name]:
                cacheData.deps[file_name].append(dep)
            if not dep in cacheData.all_depends:
                cacheData.all_depends.append(dep)

        # Build reverse hash for PACKAGES, so runtime dependencies 
        # can be be resolved (RDEPENDS, RRECOMMENDS etc.)
        for package in packages:
            if not package in cacheData.packages:
                cacheData.packages[package] = []
            cacheData.packages[package].append(file_name)
            rprovides += (self.getVar("RPROVIDES_%s" % package, file_name, 1) or "").split() 

        for package in packages_dynamic:
            if not package in cacheData.packages_dynamic:
                cacheData.packages_dynamic[package] = []
            cacheData.packages_dynamic[package].append(file_name)

        for rprovide in rprovides:
            if not rprovide in cacheData.rproviders:
                cacheData.rproviders[rprovide] = []
            cacheData.rproviders[rprovide].append(file_name)

        # Build hash of runtime depends and rececommends

        if not file_name in cacheData.rundeps:
            cacheData.rundeps[file_name] = {}
        if not file_name in cacheData.runrecs:
            cacheData.runrecs[file_name] = {}

        rdepends = self.getVar('RDEPENDS', file_name, True) or ""
        rrecommends = self.getVar('RRECOMMENDS', file_name, True) or ""
        for package in packages + [pn]:
            if not package in cacheData.rundeps[file_name]:
                cacheData.rundeps[file_name][package] = []
            if not package in cacheData.runrecs[file_name]:
                cacheData.runrecs[file_name][package] = []

            cacheData.rundeps[file_name][package] = rdepends + " " + (self.getVar("RDEPENDS_%s" % package, file_name, True) or "")
            cacheData.runrecs[file_name][package] = rrecommends + " " + (self.getVar("RRECOMMENDS_%s" % package, file_name, True) or "")

        # Collect files we may need for possible world-dep
        # calculations
        if not self.getVar('BROKEN', file_name, True) and not self.getVar('EXCLUDE_FROM_WORLD', file_name, True):
            cacheData.possible_world.append(file_name)

        # Touch this to make sure its in the cache
        self.getVar('__BB_DONT_CACHE', file_name, True)
        self.getVar('BBCLASSEXTEND', file_name, True)

    def load_bbfile( self, bbfile , config):
        """
        Load and parse one .bb build file
        Return the data and whether parsing resulted in the file being skipped
        """

        import bb
        from bb import utils, data, parse, debug, event, fatal

        # expand tmpdir to include this topdir
        data.setVar('TMPDIR', data.getVar('TMPDIR', config, 1) or "", config)
        bbfile_loc = os.path.abspath(os.path.dirname(bbfile))
        oldpath = os.path.abspath(os.getcwd())
        if bb.parse.cached_mtime_noerror(bbfile_loc):
            os.chdir(bbfile_loc)
        bb_data = data.init_db(config)
        try:
            bb_data = parse.handle(bbfile, bb_data) # read .bb data
            os.chdir(oldpath)
            return bb_data, False
        except bb.parse.SkipPackage:
            os.chdir(oldpath)
            return bb_data, True
        except:
            os.chdir(oldpath)
            raise

def init(cooker):
    """
    The Objective: Cache the minimum amount of data possible yet get to the 
    stage of building packages (i.e. tryBuild) without reparsing any .bb files.

    To do this, we intercept getVar calls and only cache the variables we see 
    being accessed. We rely on the cache getVar calls being made for all 
    variables bitbake might need to use to reach this stage. For each cached 
    file we need to track:

    * Its mtime
    * The mtimes of all its dependencies
    * Whether it caused a parse.SkipPackage exception

    Files causing parsing errors are evicted from the cache.

    """
    return Cache(cooker)



#============================================================================#
# CacheData
#============================================================================#
class CacheData:
    """
    The data structures we compile from the cached data
    """

    def __init__(self):
        """
        Direct cache variables
        (from Cache.handle_data)
        """
        self.providers   = {}
        self.rproviders = {}
        self.packages = {}
        self.packages_dynamic = {}
        self.possible_world = []
        self.pkg_pn = {}
        self.pkg_fn = {}
        self.pkg_pepvpr = {}
        self.pkg_dp = {}
        self.pn_provides = {}
        self.fn_provides = {}
        self.all_depends = []
        self.deps = {}
        self.rundeps = {}
        self.runrecs = {}
        self.task_queues = {}
        self.task_deps = {}
        self.stamp = {}
        self.preferred = {}

        """
        Indirect Cache variables
        (set elsewhere)
        """
        self.ignored_dependencies = []
        self.world_target = set()
        self.bbfile_priority = {}
        self.bbfile_config_priorities = []