Mercurial > hg
annotate tests/test-pathencode.py @ 27372:a79cba6cb206
help: add documentation for changegroup formats
There is no formal location for spec-like technical/internal docs. The
repository makes sense as such a location because spec-like
documentation should be reviewed (ruling out a wiki). mpm has also
stated that he would like this documentation to be part of the
built-in help system. So, we establish an "internals" sub-directory
to hold this class of documentation.
The format of changegroups does not appear to be documented anywhere,
even in source code. It therefore seemed like an appropriate first thing
to document.
This patch adds low-level documentation of versions 1 and 2 of the
changegroup foromat. It currently only describes the raw data format.
There is probably room to write higher-level documentation on strategies
for producing and consuming the data. We'll leave that for another day.
The added file is not yet accessible via `hg help` nor via hgweb.
Support for this will follow in subsequent patches.
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Sun, 25 Oct 2015 00:19:45 +0100 |
parents | a6eb4e481134 |
children | 72f683260f31 |
rev | line source |
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1 # This is a randomized test that generates different pathnames every |
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2 # time it is invoked, and tests the encoding of those pathnames. |
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3 # |
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4 # It uses a simple probabilistic model to generate valid pathnames |
26098 | 5 # that have proven likely to expose bugs and divergent behavior in |
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6 # different encoding implementations. |
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7 |
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8 from mercurial import store |
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9 import binascii, itertools, math, os, random, sys, time |
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10 import collections |
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11 |
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12 validchars = set(map(chr, range(0, 256))) |
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13 alphanum = range(ord('A'), ord('Z')) |
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14 |
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15 for c in '\0/': |
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16 validchars.remove(c) |
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17 |
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18 winreserved = ('aux con prn nul'.split() + |
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19 ['com%d' % i for i in xrange(1, 10)] + |
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20 ['lpt%d' % i for i in xrange(1, 10)]) |
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21 |
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22 def casecombinations(names): |
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23 '''Build all case-diddled combinations of names.''' |
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24 |
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25 combos = set() |
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26 |
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27 for r in names: |
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28 for i in xrange(len(r) + 1): |
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29 for c in itertools.combinations(xrange(len(r)), i): |
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30 d = r |
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31 for j in c: |
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32 d = ''.join((d[:j], d[j].upper(), d[j + 1:])) |
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33 combos.add(d) |
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34 return sorted(combos) |
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35 |
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36 def buildprobtable(fp, cmd='hg manifest tip'): |
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37 '''Construct and print a table of probabilities for path name |
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38 components. The numbers are percentages.''' |
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39 |
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40 counts = collections.defaultdict(lambda: 0) |
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41 for line in os.popen(cmd).read().splitlines(): |
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42 if line[-2:] in ('.i', '.d'): |
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43 line = line[:-2] |
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44 if line.startswith('data/'): |
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45 line = line[5:] |
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46 for c in line: |
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47 counts[c] += 1 |
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48 for c in '\r/\n': |
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49 counts.pop(c, None) |
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50 t = sum(counts.itervalues()) / 100.0 |
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51 fp.write('probtable = (') |
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52 for i, (k, v) in enumerate(sorted(counts.iteritems(), key=lambda x: x[1], |
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53 reverse=True)): |
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54 if (i % 5) == 0: |
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55 fp.write('\n ') |
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56 vt = v / t |
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57 if vt < 0.0005: |
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58 break |
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59 fp.write('(%r, %.03f), ' % (k, vt)) |
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60 fp.write('\n )\n') |
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61 |
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62 # A table of character frequencies (as percentages), gleaned by |
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63 # looking at filelog names from a real-world, very large repo. |
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64 |
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65 probtable = ( |
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66 ('t', 9.828), ('e', 9.042), ('s', 8.011), ('a', 6.801), ('i', 6.618), |
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67 ('g', 5.053), ('r', 5.030), ('o', 4.887), ('p', 4.363), ('n', 4.258), |
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68 ('l', 3.830), ('h', 3.693), ('_', 3.659), ('.', 3.377), ('m', 3.194), |
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69 ('u', 2.364), ('d', 2.296), ('c', 2.163), ('b', 1.739), ('f', 1.625), |
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70 ('6', 0.666), ('j', 0.610), ('y', 0.554), ('x', 0.487), ('w', 0.477), |
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71 ('k', 0.476), ('v', 0.473), ('3', 0.336), ('1', 0.335), ('2', 0.326), |
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72 ('4', 0.310), ('5', 0.305), ('9', 0.302), ('8', 0.300), ('7', 0.299), |
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73 ('q', 0.298), ('0', 0.250), ('z', 0.223), ('-', 0.118), ('C', 0.095), |
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74 ('T', 0.087), ('F', 0.085), ('B', 0.077), ('S', 0.076), ('P', 0.076), |
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75 ('L', 0.059), ('A', 0.058), ('N', 0.051), ('D', 0.049), ('M', 0.046), |
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76 ('E', 0.039), ('I', 0.035), ('R', 0.035), ('G', 0.028), ('U', 0.026), |
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77 ('W', 0.025), ('O', 0.017), ('V', 0.015), ('H', 0.013), ('Q', 0.011), |
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78 ('J', 0.007), ('K', 0.005), ('+', 0.004), ('X', 0.003), ('Y', 0.001), |
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79 ) |
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80 |
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81 for c, _ in probtable: |
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82 validchars.remove(c) |
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83 validchars = list(validchars) |
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84 |
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85 def pickfrom(rng, table): |
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86 c = 0 |
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87 r = rng.random() * sum(i[1] for i in table) |
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88 for i, p in table: |
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89 c += p |
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90 if c >= r: |
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91 return i |
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92 |
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93 reservedcombos = casecombinations(winreserved) |
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94 |
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95 # The first component of a name following a slash. |
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96 |
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97 firsttable = ( |
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98 (lambda rng: pickfrom(rng, probtable), 90), |
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99 (lambda rng: rng.choice(validchars), 5), |
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100 (lambda rng: rng.choice(reservedcombos), 5), |
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101 ) |
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102 |
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103 # Components of a name following the first. |
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104 |
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105 resttable = firsttable[:-1] |
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106 |
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107 # Special suffixes. |
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108 |
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109 internalsuffixcombos = casecombinations('.hg .i .d'.split()) |
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110 |
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111 # The last component of a path, before a slash or at the end of a name. |
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112 |
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113 lasttable = resttable + ( |
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114 (lambda rng: '', 95), |
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115 (lambda rng: rng.choice(internalsuffixcombos), 5), |
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116 ) |
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117 |
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118 def makepart(rng, k): |
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119 '''Construct a part of a pathname, without slashes.''' |
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120 |
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121 p = pickfrom(rng, firsttable)(rng) |
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122 l = len(p) |
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123 ps = [p] |
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124 maxl = rng.randint(1, k) |
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125 while l < maxl: |
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126 p = pickfrom(rng, resttable)(rng) |
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127 l += len(p) |
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128 ps.append(p) |
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129 ps.append(pickfrom(rng, lasttable)(rng)) |
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130 return ''.join(ps) |
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131 |
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132 def makepath(rng, j, k): |
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133 '''Construct a complete pathname.''' |
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134 |
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135 return ('data/' + '/'.join(makepart(rng, k) for _ in xrange(j)) + |
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136 rng.choice(['.d', '.i'])) |
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137 |
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138 def genpath(rng, count): |
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139 '''Generate random pathnames with gradually increasing lengths.''' |
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140 |
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141 mink, maxk = 1, 4096 |
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142 def steps(): |
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143 for i in xrange(count): |
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144 yield mink + int(round(math.sqrt((maxk - mink) * float(i) / count))) |
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145 for k in steps(): |
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146 x = rng.randint(1, k) |
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147 y = rng.randint(1, k) |
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148 yield makepath(rng, x, y) |
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149 |
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150 def runtests(rng, seed, count): |
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151 nerrs = 0 |
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152 for p in genpath(rng, count): |
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153 h = store._pathencode(p) # uses C implementation, if available |
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154 r = store._hybridencode(p, True) # reference implementation in Python |
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155 if h != r: |
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156 if nerrs == 0: |
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157 print >> sys.stderr, 'seed:', hex(seed)[:-1] |
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158 print >> sys.stderr, "\np: '%s'" % p.encode("string_escape") |
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159 print >> sys.stderr, "h: '%s'" % h.encode("string_escape") |
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160 print >> sys.stderr, "r: '%s'" % r.encode("string_escape") |
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161 nerrs += 1 |
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162 return nerrs |
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163 |
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164 def main(): |
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165 import getopt |
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166 |
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167 # Empirically observed to take about a second to run |
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168 count = 100 |
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169 seed = None |
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170 opts, args = getopt.getopt(sys.argv[1:], 'c:s:', |
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171 ['build', 'count=', 'seed=']) |
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172 for o, a in opts: |
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173 if o in ('-c', '--count'): |
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174 count = int(a) |
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175 elif o in ('-s', '--seed'): |
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176 seed = long(a, base=0) # accepts base 10 or 16 strings |
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177 elif o == '--build': |
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178 buildprobtable(sys.stdout, |
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179 'find .hg/store/data -type f && ' |
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180 'cat .hg/store/fncache 2>/dev/null') |
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181 sys.exit(0) |
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182 |
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183 if seed is None: |
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184 try: |
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185 seed = long(binascii.hexlify(os.urandom(16)), 16) |
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186 except AttributeError: |
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187 seed = long(time.time() * 1000) |
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188 |
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189 rng = random.Random(seed) |
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190 if runtests(rng, seed, count): |
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191 sys.exit(1) |
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192 |
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193 if __name__ == '__main__': |
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194 main() |