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annotate mercurial/utils/storageutil.py @ 40003:ad8389ecd3f5

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storageutil: consistently raise LookupError (API) The interface docs say this is supposed to raise LookupError on failure. But for invalid revision number input, it could raise IndexError because ifileindex.node() is documented to raise IndexError. lookup() for files isn't used that much (pretty much just in basefilectx in core AFAICT). And callers should already be catching LookupError. So I don't anticipate that much fallout from this change. Differential Revision: https://phab.mercurial-scm.org/D4798
author Gregory Szorc <gregory.szorc@gmail.com>
date Fri, 28 Sep 2018 11:16:44 -0700
parents 0e8836be9541
children fa3dc85a747e
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1 # storageutil.py - Storage functionality agnostic of backend implementation.
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2 #
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3 # Copyright 2018 Gregory Szorc <gregory.szorc@gmail.com>
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4 #
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5 # This software may be used and distributed according to the terms of the
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6 # GNU General Public License version 2 or any later version.
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7
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8 from __future__ import absolute_import
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9
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10 import hashlib
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11 import re
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12
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13 from ..i18n import _
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14 from ..node import (
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15 bin,
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16 nullid,
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17 )
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18 from .. import (
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19 error,
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20 pycompat,
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21 )
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22
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23 _nullhash = hashlib.sha1(nullid)
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24
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25 def hashrevisionsha1(text, p1, p2):
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26 """Compute the SHA-1 for revision data and its parents.
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27
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28 This hash combines both the current file contents and its history
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29 in a manner that makes it easy to distinguish nodes with the same
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30 content in the revision graph.
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31 """
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32 # As of now, if one of the parent node is null, p2 is null
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33 if p2 == nullid:
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34 # deep copy of a hash is faster than creating one
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35 s = _nullhash.copy()
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36 s.update(p1)
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37 else:
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38 # none of the parent nodes are nullid
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39 if p1 < p2:
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40 a = p1
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41 b = p2
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42 else:
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43 a = p2
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44 b = p1
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45 s = hashlib.sha1(a)
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46 s.update(b)
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47 s.update(text)
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48 return s.digest()
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49
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50 METADATA_RE = re.compile(b'\x01\n')
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51
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52 def parsemeta(text):
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53 """Parse metadata header from revision data.
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54
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55 Returns a 2-tuple of (metadata, offset), where both can be None if there
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56 is no metadata.
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57 """
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58 # text can be buffer, so we can't use .startswith or .index
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59 if text[:2] != b'\x01\n':
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60 return None, None
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61 s = METADATA_RE.search(text, 2).start()
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62 mtext = text[2:s]
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63 meta = {}
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64 for l in mtext.splitlines():
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65 k, v = l.split(b': ', 1)
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66 meta[k] = v
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67 return meta, s + 2
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68
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69 def packmeta(meta, text):
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70 """Add metadata to fulltext to produce revision text."""
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71 keys = sorted(meta)
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72 metatext = b''.join(b'%s: %s\n' % (k, meta[k]) for k in keys)
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73 return b'\x01\n%s\x01\n%s' % (metatext, text)
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74
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75 def iscensoredtext(text):
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76 meta = parsemeta(text)[0]
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77 return meta and b'censored' in meta
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78
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79 def filtermetadata(text):
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80 """Extract just the revision data from source text.
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81
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82 Returns ``text`` unless it has a metadata header, in which case we return
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83 a new buffer without hte metadata.
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84 """
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85 if not text.startswith(b'\x01\n'):
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86 return text
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87
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88 offset = text.index(b'\x01\n', 2)
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89 return text[offset + 2:]
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90
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91 def iterrevs(storelen, start=0, stop=None):
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92 """Iterate over revision numbers in a store."""
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93 step = 1
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94
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95 if stop is not None:
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96 if start > stop:
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97 step = -1
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98 stop += step
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99 if stop > storelen:
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100 stop = storelen
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101 else:
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102 stop = storelen
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103
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104 return pycompat.xrange(start, stop, step)
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105
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106 def fileidlookup(store, fileid, identifier):
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107 """Resolve the file node for a value.
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108
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109 ``store`` is an object implementing the ``ifileindex`` interface.
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110
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111 ``fileid`` can be:
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112
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113 * A 20 byte binary node.
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114 * An integer revision number
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115 * A 40 byte hex node.
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116 * A bytes that can be parsed as an integer representing a revision number.
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117
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118 ``identifier`` is used to populate ``error.LookupError`` with an identifier
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119 for the store.
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120
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121 Raises ``error.LookupError`` on failure.
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122 """
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123 if isinstance(fileid, int):
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124 try:
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125 return store.node(fileid)
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126 except IndexError:
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127 raise error.LookupError(fileid, identifier, _('no match found'))
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128
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129 if len(fileid) == 20:
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130 try:
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131 store.rev(fileid)
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132 return fileid
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133 except error.LookupError:
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134 pass
0e8836be9541 storageutil: implement file identifier resolution method (BC)
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39881
diff changeset
135
0e8836be9541 storageutil: implement file identifier resolution method (BC)
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39881
diff changeset
136 if len(fileid) == 40:
0e8836be9541 storageutil: implement file identifier resolution method (BC)
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39881
diff changeset
137 try:
0e8836be9541 storageutil: implement file identifier resolution method (BC)
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39881
diff changeset
138 rawnode = bin(fileid)
0e8836be9541 storageutil: implement file identifier resolution method (BC)
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39881
diff changeset
139 store.rev(rawnode)
0e8836be9541 storageutil: implement file identifier resolution method (BC)
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39881
diff changeset
140 return rawnode
0e8836be9541 storageutil: implement file identifier resolution method (BC)
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39881
diff changeset
141 except TypeError:
0e8836be9541 storageutil: implement file identifier resolution method (BC)
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39881
diff changeset
142 pass
0e8836be9541 storageutil: implement file identifier resolution method (BC)
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39881
diff changeset
143
0e8836be9541 storageutil: implement file identifier resolution method (BC)
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39881
diff changeset
144 try:
0e8836be9541 storageutil: implement file identifier resolution method (BC)
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39881
diff changeset
145 rev = int(fileid)
0e8836be9541 storageutil: implement file identifier resolution method (BC)
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39881
diff changeset
146
0e8836be9541 storageutil: implement file identifier resolution method (BC)
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39881
diff changeset
147 if b'%d' % rev != fileid:
0e8836be9541 storageutil: implement file identifier resolution method (BC)
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39881
diff changeset
148 raise ValueError
0e8836be9541 storageutil: implement file identifier resolution method (BC)
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39881
diff changeset
149
0e8836be9541 storageutil: implement file identifier resolution method (BC)
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39881
diff changeset
150 try:
0e8836be9541 storageutil: implement file identifier resolution method (BC)
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39881
diff changeset
151 return store.node(rev)
0e8836be9541 storageutil: implement file identifier resolution method (BC)
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39881
diff changeset
152 except (IndexError, TypeError):
0e8836be9541 storageutil: implement file identifier resolution method (BC)
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39881
diff changeset
153 pass
0e8836be9541 storageutil: implement file identifier resolution method (BC)
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39881
diff changeset
154 except (ValueError, OverflowError):
0e8836be9541 storageutil: implement file identifier resolution method (BC)
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39881
diff changeset
155 pass
0e8836be9541 storageutil: implement file identifier resolution method (BC)
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39881
diff changeset
156
0e8836be9541 storageutil: implement file identifier resolution method (BC)
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39881
diff changeset
157 raise error.LookupError(fileid, identifier, _('no match found'))