view tests/test-pathencode.py @ 50440:3a2df812e1c7

pull: add --remote-hidden option and pass it through peer creation

This option will allow to pull changesets that are hidden on the remote. This
is useful when looking into a changeset’s evolution history, resolving
evolution instability or mirroring a repository.

The option is best effort and will only affect the pull when it can. The option
will be ignored when it cannot be honored.

Support for each type of peer is yet to be implemented. They currently all warn
about lack of support. The warning code will get removed as peers gain
support for this option.

The option is still experimental, so we will have freedom to update the UI or
implementation before it graduates out of experimental.

Based on a changeset by Pierre-Yves David, which added the option.

# This is a randomized test that generates different pathnames every
# time it is invoked, and tests the encoding of those pathnames.
#
# It uses a simple probabilistic model to generate valid pathnames
# that have proven likely to expose bugs and divergent behavior in
# different encoding implementations.


import binascii
import collections
import itertools
import math
import os
import random
import sys
import time
from mercurial import (
    pycompat,
    store,
)

validchars = set(map(pycompat.bytechr, range(0, 256)))
alphanum = range(ord('A'), ord('Z'))

for c in (b'\0', b'/'):
    validchars.remove(c)

winreserved = (
    b'aux con prn nul'.split()
    + [b'com%d' % i for i in range(1, 10)]
    + [b'lpt%d' % i for i in range(1, 10)]
)


def casecombinations(names):
    '''Build all case-diddled combinations of names.'''

    combos = set()

    for r in names:
        for i in range(len(r) + 1):
            for c in itertools.combinations(range(len(r)), i):
                d = r
                for j in c:
                    d = b''.join((d[:j], d[j : j + 1].upper(), d[j + 1 :]))
                combos.add(d)
    return sorted(combos)


def buildprobtable(fp, cmd='hg manifest tip'):
    """Construct and print a table of probabilities for path name
    components.  The numbers are percentages."""

    counts = collections.defaultdict(lambda: 0)
    for line in os.popen(cmd).read().splitlines():
        if line[-2:] in ('.i', '.d'):
            line = line[:-2]
        if line.startswith('data/'):
            line = line[5:]
        for c in line:
            counts[c] += 1
    for c in '\r/\n':
        counts.pop(c, None)
    t = sum(counts.values()) / 100.0
    fp.write('probtable = (')
    for i, (k, v) in enumerate(
        sorted(counts.items(), key=lambda x: x[1], reverse=True)
    ):
        if (i % 5) == 0:
            fp.write('\n    ')
        vt = v / t
        if vt < 0.0005:
            break
        fp.write('(%r, %.03f), ' % (k, vt))
    fp.write('\n    )\n')


# A table of character frequencies (as percentages), gleaned by
# looking at filelog names from a real-world, very large repo.

probtable = (
    (b't', 9.828),
    (b'e', 9.042),
    (b's', 8.011),
    (b'a', 6.801),
    (b'i', 6.618),
    (b'g', 5.053),
    (b'r', 5.030),
    (b'o', 4.887),
    (b'p', 4.363),
    (b'n', 4.258),
    (b'l', 3.830),
    (b'h', 3.693),
    (b'_', 3.659),
    (b'.', 3.377),
    (b'm', 3.194),
    (b'u', 2.364),
    (b'd', 2.296),
    (b'c', 2.163),
    (b'b', 1.739),
    (b'f', 1.625),
    (b'6', 0.666),
    (b'j', 0.610),
    (b'y', 0.554),
    (b'x', 0.487),
    (b'w', 0.477),
    (b'k', 0.476),
    (b'v', 0.473),
    (b'3', 0.336),
    (b'1', 0.335),
    (b'2', 0.326),
    (b'4', 0.310),
    (b'5', 0.305),
    (b'9', 0.302),
    (b'8', 0.300),
    (b'7', 0.299),
    (b'q', 0.298),
    (b'0', 0.250),
    (b'z', 0.223),
    (b'-', 0.118),
    (b'C', 0.095),
    (b'T', 0.087),
    (b'F', 0.085),
    (b'B', 0.077),
    (b'S', 0.076),
    (b'P', 0.076),
    (b'L', 0.059),
    (b'A', 0.058),
    (b'N', 0.051),
    (b'D', 0.049),
    (b'M', 0.046),
    (b'E', 0.039),
    (b'I', 0.035),
    (b'R', 0.035),
    (b'G', 0.028),
    (b'U', 0.026),
    (b'W', 0.025),
    (b'O', 0.017),
    (b'V', 0.015),
    (b'H', 0.013),
    (b'Q', 0.011),
    (b'J', 0.007),
    (b'K', 0.005),
    (b'+', 0.004),
    (b'X', 0.003),
    (b'Y', 0.001),
)

for c, _ in probtable:
    validchars.remove(c)
validchars = list(validchars)


def pickfrom(rng, table):
    c = 0
    r = rng.random() * sum(i[1] for i in table)
    for i, p in table:
        c += p
        if c >= r:
            return i


reservedcombos = casecombinations(winreserved)

# The first component of a name following a slash.

firsttable = (
    (lambda rng: pickfrom(rng, probtable), 90),
    (lambda rng: rng.choice(validchars), 5),
    (lambda rng: rng.choice(reservedcombos), 5),
)

# Components of a name following the first.

resttable = firsttable[:-1]

# Special suffixes.

internalsuffixcombos = casecombinations(b'.hg .i .d'.split())

# The last component of a path, before a slash or at the end of a name.

lasttable = resttable + (
    (lambda rng: b'', 95),
    (lambda rng: rng.choice(internalsuffixcombos), 5),
)


def makepart(rng, k):
    '''Construct a part of a pathname, without slashes.'''

    p = pickfrom(rng, firsttable)(rng)
    l = len(p)
    ps = [p]
    maxl = rng.randint(1, k)
    while l < maxl:
        p = pickfrom(rng, resttable)(rng)
        l += len(p)
        ps.append(p)
    ps.append(pickfrom(rng, lasttable)(rng))
    return b''.join(ps)


def makepath(rng, j, k):
    '''Construct a complete pathname.'''

    return (
        b'data/'
        + b'/'.join(makepart(rng, k) for _ in range(j))
        + rng.choice([b'.d', b'.i'])
    )


def genpath(rng, count):
    '''Generate random pathnames with gradually increasing lengths.'''

    mink, maxk = 1, 4096

    def steps():
        for i in range(count):
            yield mink + int(round(math.sqrt((maxk - mink) * float(i) / count)))

    for k in steps():
        x = rng.randint(1, k)
        y = rng.randint(1, k)
        yield makepath(rng, x, y)


def runtests(rng, seed, count):
    nerrs = 0
    for p in genpath(rng, count):
        h = store._pathencode(p)  # uses C implementation, if available
        r = store._hybridencode(p, True)  # reference implementation in Python
        if h != r:
            if nerrs == 0:
                print('seed:', hex(seed)[:-1], file=sys.stderr)
            print("\np: '%s'" % p.encode("string_escape"), file=sys.stderr)
            print("h: '%s'" % h.encode("string_escape"), file=sys.stderr)
            print("r: '%s'" % r.encode("string_escape"), file=sys.stderr)
            nerrs += 1
    return nerrs


def main():
    import getopt

    # Empirically observed to take about a second to run
    count = 100
    seed = None
    opts, args = getopt.getopt(
        sys.argv[1:], 'c:s:', ['build', 'count=', 'seed=']
    )
    for o, a in opts:
        if o in ('-c', '--count'):
            count = int(a)
        elif o in ('-s', '--seed'):
            seed = int(a, base=0)  # accepts base 10 or 16 strings
        elif o == '--build':
            buildprobtable(
                sys.stdout,
                'find .hg/store/data -type f && '
                'cat .hg/store/fncache 2>/dev/null',
            )
            sys.exit(0)

    if seed is None:
        try:
            seed = int(binascii.hexlify(os.urandom(16)), 16)
        except AttributeError:
            seed = int(time.time() * 1000)

    rng = random.Random(seed)
    if runtests(rng, seed, count):
        sys.exit(1)


if __name__ == '__main__':
    main()