This file is indexed.

/usr/lib/python3/dist-packages/simplestreams/util.py is in python3-simplestreams 0.1.0~bzr460-0ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  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
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
#   Copyright (C) 2013 Canonical Ltd.
#
#   Author: Scott Moser <scott.moser@canonical.com>
#
#   Simplestreams is free software: you can redistribute it and/or modify it
#   under the terms of the GNU Affero General Public License as published by
#   the Free Software Foundation, either version 3 of the License, or (at your
#   option) any later version.
#
#   Simplestreams 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 Affero General Public
#   License for more details.
#
#   You should have received a copy of the GNU Affero General Public License
#   along with Simplestreams.  If not, see <http://www.gnu.org/licenses/>.

import errno
import os
import re
import subprocess
import tempfile
import time
import json

import simplestreams.contentsource as cs
import simplestreams.checksum_util as checksum_util
from simplestreams.log import LOG

ALIASNAME = "_aliases"

PGP_SIGNED_MESSAGE_HEADER = "-----BEGIN PGP SIGNED MESSAGE-----"
PGP_SIGNATURE_HEADER = "-----BEGIN PGP SIGNATURE-----"
PGP_SIGNATURE_FOOTER = "-----END PGP SIGNATURE-----"

_UNSET = object()

READ_SIZE = (1024 * 10)

PRODUCTS_TREE_DATA = (
    ("products", "product_name"),
    ("versions", "version_name"),
    ("items", "item_name"),
)
PRODUCTS_TREE_HIERARCHY = [_k[0] for _k in PRODUCTS_TREE_DATA]
_HAS_GPGV = None


class SignatureMissingException(Exception):
    pass


try:
    # python2
    _STRING_TYPES = (str, basestring, unicode)
except NameError:
    # python3
    _STRING_TYPES = (str,)


def stringitems(data):
    f = {}
    for k, v in data.items():
        if isinstance(v, _STRING_TYPES):
            f[k] = v
        elif isinstance(v, (int, float)):
            f[k] = str(v)
    return f


def products_exdata(tree, pedigree, include_top=True, insert_fieldnames=True):
    # given 'tree' and 'pedigree' return a 'flattened' dict that contains
    # entries for all attributes of this item those that apply to its pedigree
    harchy = PRODUCTS_TREE_DATA

    exdata = {}
    if include_top and tree:
        exdata.update(stringitems(tree))
    clevel = tree
    for (n, key) in enumerate(pedigree):
        dictname, fieldname = harchy[n]
        clevel = clevel.get(dictname, {}).get(key, {})
        exdata.update(stringitems(clevel))
        if insert_fieldnames:
            exdata[fieldname] = key
    return exdata


def products_set(tree, data, pedigree):
    harchy = PRODUCTS_TREE_HIERARCHY

    cur = tree

    for n in range(0, len(pedigree)):
        if harchy[n] not in cur:
            cur[harchy[n]] = {}
        cur = cur[harchy[n]]
        if n != (len(pedigree) - 1):
            if pedigree[n] not in cur:
                cur[pedigree[n]] = {}
            cur = cur[pedigree[n]]

    cur[pedigree[-1]] = data


def products_del(tree, pedigree):
    harchy = PRODUCTS_TREE_HIERARCHY
    cur = tree
    for n in range(0, len(pedigree)):
        if harchy[n] not in cur:
            return
        cur = cur[harchy[n]]

        if n == (len(pedigree) - 1):
            break

        if pedigree[n] not in cur:
            return

        cur = cur[pedigree[n]]

    if pedigree[-1] in cur:
        del cur[pedigree[-1]]


def products_prune(tree, preserve_empty_products=False):
    for prodname in list(tree.get('products', {}).keys()):
        keys = list(tree['products'][prodname].get('versions', {}).keys())
        for vername in keys:
            vtree = tree['products'][prodname]['versions'][vername]
            for itemname in list(vtree.get('items', {}).keys()):
                if not vtree['items'][itemname]:
                    del vtree['items'][itemname]

            if 'items' not in vtree or not vtree['items']:
                del tree['products'][prodname]['versions'][vername]

        if ('versions' not in tree['products'][prodname] or
                not tree['products'][prodname]['versions']):
            del tree['products'][prodname]

    if (not preserve_empty_products and 'products' in tree and
            not tree['products']):
        del tree['products']


def walk_products(tree, cb_product=None, cb_version=None, cb_item=None,
                  ret_finished=_UNSET):
    # walk a product tree. callbacks are called with (item, tree, (pedigree))
    for prodname, proddata in tree['products'].items():
        if cb_product:
            ret = cb_product(proddata, tree, (prodname,))
            if ret_finished != _UNSET and ret == ret_finished:
                return

        if (not cb_version and not cb_item) or 'versions' not in proddata:
            continue

        for vername, verdata in proddata['versions'].items():
            if cb_version:
                ret = cb_version(verdata, tree, (prodname, vername))
                if ret_finished != _UNSET and ret == ret_finished:
                    return

            if not cb_item or 'items' not in verdata:
                continue

            for itemname, itemdata in verdata['items'].items():
                ret = cb_item(itemdata, tree, (prodname, vername, itemname))
                if ret_finished != _UNSET and ret == ret_finished:
                    return


def expand_tree(tree, refs=None, delete=False):
    if refs is None:
        refs = tree.get(ALIASNAME, None)
    expand_data(tree, refs, delete)


def expand_data(data, refs=None, delete=False):
    if isinstance(data, dict):
        if isinstance(refs, dict):
            for key in list(data.keys()):
                if key == ALIASNAME:
                    continue
                ref = refs.get(key)
                if not ref:
                    continue
                value = data.get(key)
                if value and isinstance(value, _STRING_TYPES):
                    data.update(ref[value])
                    if delete:
                        del data[key]
        for key in data:
            expand_data(data[key], refs)
    elif isinstance(data, list):
        for item in data:
            expand_data(item, refs)


def resolve_work(src, target, maxnum=None, keep=False, itemfilter=None,
                 sort_reverse=True):
    # if more than maxnum items are in src, only the most recent maxnum will be
    # stored in target.  If keep is true, then the most recent maxnum items
    # will be kept in target even if they are no longer in src.
    # if keep is false the number in target will never be greater than that
    # in src.
    add = []
    remove = []
    reverse = sort_reverse

    if maxnum is None and keep:
        raise TypeError("maxnum(%s) cannot be None if keep is True" % maxnum)

    if not (maxnum is None or isinstance(maxnum, int)):
        raise TypeError("maxnum(%s) must be integer or None" % maxnum)

    if not (keep is None or isinstance(keep, int)):
        raise TypeError("keep(%s) must be integer or None" % keep)

    # Ensure that all source items are passed through filters
    # In case the filters have changed from the last run
    for item in sorted(src, reverse=reverse):
        if itemfilter is None or itemfilter(item):
            if item not in target:
                add.append(item)

    for item in sorted(target, reverse=reverse):
        if item not in src:
            remove.append(item)

    if keep and len(remove):
        after_add = len(target) + len(add)
        while len(remove) and (maxnum > (after_add - len(remove))):
            remove.pop(0)

    mtarget = sorted([f for f in target + add if f not in remove],
                     reverse=reverse)
    if maxnum is not None and len(mtarget) > maxnum:
        for item in mtarget[maxnum:]:
            if item in target:
                remove.append(item)
            else:
                add.pop(add.index(item))
    remove = sorted(remove, reverse=bool(not reverse))
    return(add, remove)


def policy_read_signed(content, path, keyring=None):
    # convenience wrapper around 'read_signed' for use MirrorReader policy
    return read_signed(content=content, keyring=keyring)


def has_gpgv():
    global _HAS_GPGV
    if _HAS_GPGV is not None:
        return _HAS_GPGV

    if which('gpgv'):
        try:
            env = os.environ.copy()
            env['LANG'] = 'C'
            out, err = subp(["gpgv", "--help"], capture=True, env=env)
            _HAS_GPGV = 'gnupg' in out.lower() or 'gnupg' in err.lower()
        except subprocess.CalledProcessError:
            _HAS_GPGV = False
    else:
        _HAS_GPGV = False
    return _HAS_GPGV


def read_signed(content, keyring=None, checked=True):
    # ensure that content is signed by a key in keyring.
    # if no keyring given use default.
    if content.startswith(PGP_SIGNED_MESSAGE_HEADER):
        if checked and keyring and has_gpgv():
            cmd = ["gpgv", "--keyring=%s" % keyring, "-"]
        elif checked:
            # http://rfc-ref.org/RFC-TEXTS/2440/chapter7.html
            cmd = ["gpg", "--batch", "--verify"]
            if keyring:
                cmd.append("--keyring=%s" % keyring)
            cmd.append("-")
        if checked:
            try:
                subp(cmd, data=content)
            except subprocess.CalledProcessError as e:
                LOG.debug("failed: %s\n out=%s\n err=%s" %
                          (' '.join(cmd), e.output[0], e.output[1]))
                raise e

        ret = {'body': [], 'signature': [], 'garbage': []}
        lines = content.splitlines()
        i = 0
        for i in range(0, len(lines)):
            if lines[i] == PGP_SIGNED_MESSAGE_HEADER:
                mode = "header"
                continue
            elif mode == "header":
                if lines[i] != "":
                    mode = "body"
                continue
            elif lines[i] == PGP_SIGNATURE_HEADER:
                mode = "signature"
                continue
            elif lines[i] == PGP_SIGNATURE_FOOTER:
                mode = "garbage"
                continue

            # dash-escaped content in body
            if lines[i].startswith("- ") and mode == "body":
                ret[mode].append(lines[i][2:])
            else:
                ret[mode].append(lines[i])

        ret['body'].append('')  # need empty line at end
        return "\n".join(ret['body'])
    else:
        raise SignatureMissingException("No signature found!")


def load_content(content):
    if isinstance(content, bytes):
        content = content.decode('utf-8')
    return json.loads(content)


def dump_data(data):
    return json.dumps(data, indent=1, sort_keys=True,
                      separators=(',', ': ')).encode('utf-8')


def timestamp(ts=None):
    return time.strftime("%a, %d %b %Y %H:%M:%S +0000", time.gmtime(ts))


def move_dups(src, target, sticky=None):
    # given src = {e1: {a:a, b:c}, e2: {a:a, b:d, e:f}}
    # update target with {a:a}, and delete 'a' from entries in dict1
    # if a key exists in target, it will not be copied or deleted.
    if len(src) == 0:
        return

    candidates = set.intersection(*[set(e.keys()) for e in src.values()])
    if sticky is not None:
        candidates.difference_update(sticky)

    updates = {}
    for entry in list(src.keys()):
        for k, v in src[entry].items():
            if k not in candidates:
                continue
            if k in updates:
                if v != updates[k] or not isinstance(v, _STRING_TYPES):
                    del updates[k]
                    candidates.remove(k)
            else:
                if isinstance(v, _STRING_TYPES) and target.get(k, v) == v:
                    updates[k] = v
                else:
                    candidates.remove(k)

    for entry in list(src.keys()):
        for k in list(src[entry].keys()):
            if k in updates:
                del src[entry][k]

    target.update(updates)


def products_condense(ptree, sticky=None, top='versions'):
    # walk a products tree, copying up item keys as far as they'll go
    # only move items to a sibling of the 'top'.

    if top not in ('versions', 'products'):
        raise ValueError("'top' must be one of: %s" %
                         ','.join(PRODUCTS_TREE_HIERARCHY))

    def call_move_dups(cur, _tree, pedigree):
        (_mtype, stname) = (("product", "versions"),
                            ("version", "items"))[len(pedigree) - 1]
        move_dups(cur.get(stname, {}), cur, sticky=sticky)

    walk_products(ptree, cb_version=call_move_dups)
    walk_products(ptree, cb_product=call_move_dups)
    if top == 'versions':
        return
    move_dups(ptree['products'], ptree)


def assert_safe_path(path):
    if path == "" or path is None:
        return
    path = str(path)
    if os.path.isabs(path):
        raise TypeError("Path '%s' is absolute path" % path)
    bad = (".." + os.path.sep, "..." + os.path.sep)
    for tok in bad:
        if path.startswith(tok):
            raise TypeError("Path '%s' starts with '%s'" % (path, tok))
    bad = (os.path.sep + ".." + os.path.sep, os.path.sep + "..." + os.path.sep)
    for tok in bad:
        if tok in path:
            raise TypeError("Path '%s' contains '%s'" % (path, tok))


def read_url(url):
    return cs.UrlContentSource(url).read()


def mkdir_p(path):
    try:
        os.makedirs(path)
    except OSError as exc:
        if exc.errno != errno.EEXIST:
            raise
    return


def get_local_copy(contentsource, read_size=READ_SIZE, progress_callback=None):
    (tfd, tpath) = tempfile.mkstemp()
    tfile = os.fdopen(tfd, "wb")
    try:
        LOG.debug("getting local copy of %s", contentsource.url)
        while True:
            buf = contentsource.read(read_size)
            if progress_callback:
                progress_callback(read_size)
            tfile.write(buf)
            if len(buf) != read_size:
                break
        return (tpath, True)

    except Exception as e:
        os.unlink(tpath)
        raise e


def subp(args, data=None, capture=True, shell=False, env=None):
    if not capture:
        stdout, stderr = (None, None)
    else:
        stdout, stderr = (subprocess.PIPE, subprocess.PIPE)

    sp = subprocess.Popen(args, stdout=stdout, stderr=stderr,
                          stdin=subprocess.PIPE, shell=shell, env=env)
    if isinstance(data, str):
        data = data.encode('utf-8')

    (out, err) = sp.communicate(data)
    if isinstance(out, bytes):
        out = out.decode('utf-8')
    if isinstance(err, bytes):
        err = err.decode('utf-8')

    rc = sp.returncode
    if rc != 0:
        raise subprocess.CalledProcessError(rc, args, output=(out, err))

    return (out, err)


def get_sign_cmd(path, output=None, inline=False):
    cmd = ['gpg']
    defkey = os.environ.get('SS_GPG_DEFAULT_KEY')
    if defkey:
        cmd.extend(['--default-key', defkey])

    batch = os.environ.get('SS_GPG_BATCH', "1").lower()
    if batch not in ("0", "false"):
        cmd.append('--batch')

    if output:
        cmd.extend(['--output', output])

    if inline:
        cmd.append('--clearsign')
    else:
        cmd.extend(['--armor', '--detach-sign'])

    cmd.extend([path])
    return cmd


def make_signed_content_paths(content):
    # loads json content.  If it is a products:1.0 file
    # then it fixes up 'path' elements to point to signed names (.sjson)
    # returns tuple of (changed, updated)
    data = json.loads(content)

    if data.get("format") != "index:1.0":
        return (False, None)

    for content_ent in list(data.get('index', {}).values()):
        path = content_ent.get('path')
        if path.endswith(".json"):
            content_ent['path'] = signed_fname(path, inline=True)

    return (True, json.dumps(data, indent=1))


def signed_fname(fname, inline=True):
    if inline:
        sfname = fname[0:-len(".json")] + ".sjson"
    else:
        sfname = fname + ".gpg"

    return sfname


def rm_f_file(fname, skip=None):
    if skip is None:
        skip = []
    if fname in skip:
        return
    try:
        os.unlink(fname)
    except OSError as exc:
        if exc.errno != errno.ENOENT:
            raise


def which(program):
    # Return path of program for execution if found in path
    def is_exe(fpath):
        return os.path.isfile(fpath) and os.access(fpath, os.X_OK)

    _fpath, _ = os.path.split(program)
    if _fpath:
        if is_exe(program):
            return program
    else:
        for path in os.environ.get("PATH", "").split(os.pathsep):
            path = path.strip('"')
            exe_file = os.path.join(path, program)
            if is_exe(exe_file):
                return exe_file

    return None


def sign_file(fname, inline=True, outfile=None):
    if outfile is None:
        outfile = signed_fname(fname, inline=inline)
    rm_f_file(outfile, skip=["-"])
    return subp(get_sign_cmd(path=fname, output=outfile, inline=inline))[0]


def sign_content(content, outfile="-", inline=True):
    rm_f_file(outfile, skip=["-"])
    return subp(args=get_sign_cmd(path="-", output=outfile, inline=inline),
                data=content)[0]


def path_from_mirror_url(mirror, path):
    if path is not None:
        return (mirror, path)

    path_regex = "streams/v1/.*[.](sjson|json)$"
    result = re.search(path_regex, mirror)
    if result:
        path = mirror[result.start():]
        mirror = mirror[:result.start()]
    else:
        path = "streams/v1/index.sjson"

    return (mirror, path)


class ProgressAggregator(object):
    def __init__(self, remaining_items=None):
        self.last_emitted = 0
        self.current_written = 0
        self.current_file = None
        self.remaining_items = remaining_items
        if self.remaining_items:
            self.total_image_count = len(self.remaining_items)
            self.total_size = sum(self.remaining_items.values())
        else:
            self.total_image_count = 0
            self.total_size = 0
        self.total_written = 0

    def progress_callback(self, progress):
        if self.current_file != progress['name']:
            if self.remaining_items and self.current_file is not None:
                del self.remaining_items[self.current_file]
            self.current_file = progress['name']
            self.last_emitted = 0
            self.current_written = 0

        size = float(progress['size'])
        written = float(progress['written'])
        self.current_written += written
        self.total_written += written
        interval = self.current_written - self.last_emitted
        if interval > size / 100:
            self.last_emitted = self.current_written
            progress['written'] = self.current_written
            self.emit(progress)

    def emit(self, progress):
        raise NotImplementedError()


# these are legacy
CHECKSUMS = checksum_util.CHECKSUMS
item_checksums = checksum_util.item_checksums
ALGORITHMS = checksum_util.ALGORITHMS
checksummer = checksum_util.checksummer


# vi: ts=4 expandtab