Mercurial > hg
annotate hgext/censor.py @ 24880:5e111acc1170 stable
censor: remove meaningless explanation about .hgcensored
There is no code path handling ".hgcensored" in Mercurial source tree.
This meaningless explanation may make users misunderstand about
censor.
author | FUJIWARA Katsunori <foozy@lares.dti.ne.jp> |
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date | Thu, 30 Apr 2015 03:39:39 +0900 |
parents | 1bcfecbbf569 |
children | cba84b06b702 |
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1 # Copyright (C) 2015 - Mike Edgar <adgar@google.com> |
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2 # |
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3 # This extension enables removal of file content at a given revision, |
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4 # rewriting the data/metadata of successive revisions to preserve revision log |
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5 # integrity. |
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6 |
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7 """erase file content at a given revision |
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8 |
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9 The censor command instructs Mercurial to erase all content of a file at a given |
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10 revision *without updating the changeset hash.* This allows existing history to |
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11 remain valid while preventing future clones/pulls from receiving the erased |
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12 data. |
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13 |
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14 Typical uses for censor are due to security or legal requirements, including:: |
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15 |
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16 * Passwords, private keys, crytographic material |
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17 * Licensed data/code/libraries for which the license has expired |
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18 * Personally Identifiable Information or other private data |
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19 |
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20 Censored nodes can interrupt mercurial's typical operation whenever the excised |
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21 data needs to be materialized. Some commands, like ``hg cat``/``hg revert``, |
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22 simply fail when asked to produce censored data. Others, like ``hg verify`` and |
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23 ``hg update``, must be capable of tolerating censored data to continue to |
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24 function in a meaningful way. Such commands only tolerate censored file |
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25 revisions if they are allowed by the policy specified by the "censor.allow" |
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26 config option. |
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27 """ |
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28 |
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29 from mercurial.node import short |
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30 from mercurial import cmdutil, error, filelog, revlog, scmutil, util |
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31 from mercurial.i18n import _ |
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32 |
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33 cmdtable = {} |
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34 command = cmdutil.command(cmdtable) |
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35 testedwith = 'internal' |
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36 |
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37 @command('censor', |
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38 [('r', 'rev', '', _('censor file from specified revision'), _('REV')), |
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39 ('t', 'tombstone', '', _('replacement tombstone data'), _('TEXT'))], |
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40 _('-r REV [-t TEXT] [FILE]')) |
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41 def censor(ui, repo, path, rev='', tombstone='', **opts): |
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42 if not path: |
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43 raise util.Abort(_('must specify file path to censor')) |
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44 if not rev: |
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45 raise util.Abort(_('must specify revision to censor')) |
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46 |
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47 flog = repo.file(path) |
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48 if not len(flog): |
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49 raise util.Abort(_('cannot censor file with no history')) |
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50 |
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51 rev = scmutil.revsingle(repo, rev, rev).rev() |
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52 try: |
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53 ctx = repo[rev] |
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54 except KeyError: |
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55 raise util.Abort(_('invalid revision identifier %s') % rev) |
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56 |
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57 try: |
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58 fctx = ctx.filectx(path) |
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59 except error.LookupError: |
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60 raise util.Abort(_('file does not exist at revision %s') % rev) |
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61 |
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62 fnode = fctx.filenode() |
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63 headctxs = [repo[c] for c in repo.heads()] |
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64 heads = [c for c in headctxs if path in c and c.filenode(path) == fnode] |
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65 if heads: |
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66 headlist = ', '.join([short(c.node()) for c in heads]) |
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67 raise util.Abort(_('cannot censor file in heads (%s)') % headlist, |
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68 hint=_('clean/delete and commit first')) |
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69 |
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70 wctx = repo[None] |
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71 wp = wctx.parents() |
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72 if ctx.node() in [p.node() for p in wp]: |
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73 raise util.Abort(_('cannot censor working directory'), |
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74 hint=_('clean/delete/update first')) |
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75 |
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76 flogv = flog.version & 0xFFFF |
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77 if flogv != revlog.REVLOGNG: |
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78 raise util.Abort( |
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79 _('censor does not support revlog version %d') % (flogv,)) |
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80 |
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81 tombstone = filelog.packmeta({"censored": tombstone}, "") |
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82 |
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83 crev = fctx.filerev() |
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84 |
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85 if len(tombstone) > flog.rawsize(crev): |
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86 raise util.Abort(_( |
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87 'censor tombstone must be no longer than censored data')) |
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88 |
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89 # Using two files instead of one makes it easy to rewrite entry-by-entry |
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90 idxread = repo.svfs(flog.indexfile, 'r') |
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91 idxwrite = repo.svfs(flog.indexfile, 'wb', atomictemp=True) |
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92 if flog.version & revlog.REVLOGNGINLINEDATA: |
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93 dataread, datawrite = idxread, idxwrite |
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94 else: |
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95 dataread = repo.svfs(flog.datafile, 'r') |
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96 datawrite = repo.svfs(flog.datafile, 'wb', atomictemp=True) |
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97 |
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98 # Copy all revlog data up to the entry to be censored. |
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99 rio = revlog.revlogio() |
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100 offset = flog.start(crev) |
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101 |
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102 for chunk in util.filechunkiter(idxread, limit=crev * rio.size): |
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103 idxwrite.write(chunk) |
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104 for chunk in util.filechunkiter(dataread, limit=offset): |
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105 datawrite.write(chunk) |
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106 |
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107 def rewriteindex(r, newoffs, newdata=None): |
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108 """Rewrite the index entry with a new data offset and optional new data. |
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109 |
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110 The newdata argument, if given, is a tuple of three positive integers: |
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111 (new compressed, new uncompressed, added flag bits). |
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112 """ |
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113 offlags, comp, uncomp, base, link, p1, p2, nodeid = flog.index[r] |
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114 flags = revlog.gettype(offlags) |
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115 if newdata: |
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116 comp, uncomp, nflags = newdata |
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117 flags |= nflags |
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118 offlags = revlog.offset_type(newoffs, flags) |
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119 e = (offlags, comp, uncomp, r, link, p1, p2, nodeid) |
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120 idxwrite.write(rio.packentry(e, None, flog.version, r)) |
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121 idxread.seek(rio.size, 1) |
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122 |
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123 def rewrite(r, offs, data, nflags=revlog.REVIDX_DEFAULT_FLAGS): |
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124 """Write the given full text to the filelog with the given data offset. |
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125 |
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126 Returns: |
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127 The integer number of data bytes written, for tracking data offsets. |
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128 """ |
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129 flag, compdata = flog.compress(data) |
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130 newcomp = len(flag) + len(compdata) |
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131 rewriteindex(r, offs, (newcomp, len(data), nflags)) |
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132 datawrite.write(flag) |
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133 datawrite.write(compdata) |
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134 dataread.seek(flog.length(r), 1) |
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135 return newcomp |
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136 |
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137 # Rewrite censored revlog entry with (padded) tombstone data. |
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138 pad = ' ' * (flog.rawsize(crev) - len(tombstone)) |
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139 offset += rewrite(crev, offset, tombstone + pad, revlog.REVIDX_ISCENSORED) |
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140 |
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141 # Rewrite all following filelog revisions fixing up offsets and deltas. |
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142 for srev in xrange(crev + 1, len(flog)): |
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143 if crev in flog.parentrevs(srev): |
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144 # Immediate children of censored node must be re-added as fulltext. |
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145 try: |
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146 revdata = flog.revision(srev) |
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147 except error.CensoredNodeError, e: |
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148 revdata = e.tombstone |
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149 dlen = rewrite(srev, offset, revdata) |
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150 else: |
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151 # Copy any other revision data verbatim after fixing up the offset. |
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152 rewriteindex(srev, offset) |
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153 dlen = flog.length(srev) |
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154 for chunk in util.filechunkiter(dataread, limit=dlen): |
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155 datawrite.write(chunk) |
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156 offset += dlen |
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157 |
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158 idxread.close() |
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159 idxwrite.close() |
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160 if dataread is not idxread: |
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161 dataread.close() |
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162 datawrite.close() |