author | Yuya Nishihara <yuya@tcha.org> |
Sat, 13 Feb 2016 20:13:45 +0900 | |
changeset 28272 | 760f9d04842a |
parent 28092 | 5166b7a84b72 |
child 29841 | d5883fd055c6 |
permissions | -rw-r--r-- |
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# Copyright (C) 2015 - Mike Edgar <adgar@google.com> |
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# |
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# This extension enables removal of file content at a given revision, |
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# rewriting the data/metadata of successive revisions to preserve revision log |
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# integrity. |
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"""erase file content at a given revision |
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The censor command instructs Mercurial to erase all content of a file at a given |
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revision *without updating the changeset hash.* This allows existing history to |
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remain valid while preventing future clones/pulls from receiving the erased |
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data. |
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Typical uses for censor are due to security or legal requirements, including:: |
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* Passwords, private keys, cryptographic material |
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* Licensed data/code/libraries for which the license has expired |
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* Personally Identifiable Information or other private data |
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Censored nodes can interrupt mercurial's typical operation whenever the excised |
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data needs to be materialized. Some commands, like ``hg cat``/``hg revert``, |
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simply fail when asked to produce censored data. Others, like ``hg verify`` and |
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``hg update``, must be capable of tolerating censored data to continue to |
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function in a meaningful way. Such commands only tolerate censored file |
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revisions if they are allowed by the "censor.policy=ignore" config option. |
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""" |
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from __future__ import absolute_import |
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from mercurial.i18n import _ |
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from mercurial.node import short |
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from mercurial import ( |
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cmdutil, |
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error, |
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filelog, |
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lock as lockmod, |
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revlog, |
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scmutil, |
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util, |
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) |
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cmdtable = {} |
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command = cmdutil.command(cmdtable) |
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# Note for extension authors: ONLY specify testedwith = 'internal' for |
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# extensions which SHIP WITH MERCURIAL. Non-mainline extensions should |
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# be specifying the version(s) of Mercurial they are tested with, or |
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# leave the attribute unspecified. |
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testedwith = 'internal' |
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@command('censor', |
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[('r', 'rev', '', _('censor file from specified revision'), _('REV')), |
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('t', 'tombstone', '', _('replacement tombstone data'), _('TEXT'))], |
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_('-r REV [-t TEXT] [FILE]')) |
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def censor(ui, repo, path, rev='', tombstone='', **opts): |
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wlock = lock = None |
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try: |
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wlock = repo.wlock() |
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lock = repo.lock() |
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return _docensor(ui, repo, path, rev, tombstone, **opts) |
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finally: |
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lockmod.release(lock, wlock) |
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def _docensor(ui, repo, path, rev='', tombstone='', **opts): |
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if not path: |
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raise error.Abort(_('must specify file path to censor')) |
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if not rev: |
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raise error.Abort(_('must specify revision to censor')) |
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wctx = repo[None] |
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m = scmutil.match(wctx, (path,)) |
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if m.anypats() or len(m.files()) != 1: |
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raise error.Abort(_('can only specify an explicit filename')) |
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path = m.files()[0] |
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flog = repo.file(path) |
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if not len(flog): |
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raise error.Abort(_('cannot censor file with no history')) |
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rev = scmutil.revsingle(repo, rev, rev).rev() |
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try: |
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ctx = repo[rev] |
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except KeyError: |
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raise error.Abort(_('invalid revision identifier %s') % rev) |
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try: |
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fctx = ctx.filectx(path) |
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except error.LookupError: |
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raise error.Abort(_('file does not exist at revision %s') % rev) |
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fnode = fctx.filenode() |
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headctxs = [repo[c] for c in repo.heads()] |
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heads = [c for c in headctxs if path in c and c.filenode(path) == fnode] |
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if heads: |
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headlist = ', '.join([short(c.node()) for c in heads]) |
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raise error.Abort(_('cannot censor file in heads (%s)') % headlist, |
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hint=_('clean/delete and commit first')) |
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wp = wctx.parents() |
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if ctx.node() in [p.node() for p in wp]: |
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raise error.Abort(_('cannot censor working directory'), |
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hint=_('clean/delete/update first')) |
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flogv = flog.version & 0xFFFF |
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if flogv != revlog.REVLOGNG: |
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raise error.Abort( |
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_('censor does not support revlog version %d') % (flogv,)) |
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109 |
tombstone = filelog.packmeta({"censored": tombstone}, "") |
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110 |
|
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111 |
crev = fctx.filerev() |
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112 |
|
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113 |
if len(tombstone) > flog.rawsize(crev): |
26587
56b2bcea2529
error: get Abort from 'error' instead of 'util'
Pierre-Yves David <pierre-yves.david@fb.com>
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|
114 |
raise error.Abort(_( |
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115 |
'censor tombstone must be no longer than censored data')) |
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116 |
|
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117 |
# Using two files instead of one makes it easy to rewrite entry-by-entry |
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|
118 |
idxread = repo.svfs(flog.indexfile, 'r') |
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119 |
idxwrite = repo.svfs(flog.indexfile, 'wb', atomictemp=True) |
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120 |
if flog.version & revlog.REVLOGNGINLINEDATA: |
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121 |
dataread, datawrite = idxread, idxwrite |
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122 |
else: |
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123 |
dataread = repo.svfs(flog.datafile, 'r') |
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124 |
datawrite = repo.svfs(flog.datafile, 'wb', atomictemp=True) |
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125 |
|
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126 |
# Copy all revlog data up to the entry to be censored. |
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127 |
rio = revlog.revlogio() |
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128 |
offset = flog.start(crev) |
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129 |
|
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130 |
for chunk in util.filechunkiter(idxread, limit=crev * rio.size): |
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131 |
idxwrite.write(chunk) |
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132 |
for chunk in util.filechunkiter(dataread, limit=offset): |
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133 |
datawrite.write(chunk) |
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134 |
|
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135 |
def rewriteindex(r, newoffs, newdata=None): |
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136 |
"""Rewrite the index entry with a new data offset and optional new data. |
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137 |
|
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138 |
The newdata argument, if given, is a tuple of three positive integers: |
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|
139 |
(new compressed, new uncompressed, added flag bits). |
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|
140 |
""" |
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|
141 |
offlags, comp, uncomp, base, link, p1, p2, nodeid = flog.index[r] |
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|
142 |
flags = revlog.gettype(offlags) |
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|
143 |
if newdata: |
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144 |
comp, uncomp, nflags = newdata |
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|
145 |
flags |= nflags |
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146 |
offlags = revlog.offset_type(newoffs, flags) |
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147 |
e = (offlags, comp, uncomp, r, link, p1, p2, nodeid) |
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|
148 |
idxwrite.write(rio.packentry(e, None, flog.version, r)) |
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|
149 |
idxread.seek(rio.size, 1) |
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|
150 |
|
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|
151 |
def rewrite(r, offs, data, nflags=revlog.REVIDX_DEFAULT_FLAGS): |
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152 |
"""Write the given full text to the filelog with the given data offset. |
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|
153 |
|
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|
154 |
Returns: |
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155 |
The integer number of data bytes written, for tracking data offsets. |
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|
156 |
""" |
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|
157 |
flag, compdata = flog.compress(data) |
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|
158 |
newcomp = len(flag) + len(compdata) |
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|
159 |
rewriteindex(r, offs, (newcomp, len(data), nflags)) |
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|
160 |
datawrite.write(flag) |
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|
161 |
datawrite.write(compdata) |
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|
162 |
dataread.seek(flog.length(r), 1) |
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|
163 |
return newcomp |
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changeset
|
164 |
|
1bcfecbbf569
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parents:
diff
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|
165 |
# Rewrite censored revlog entry with (padded) tombstone data. |
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|
166 |
pad = ' ' * (flog.rawsize(crev) - len(tombstone)) |
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|
167 |
offset += rewrite(crev, offset, tombstone + pad, revlog.REVIDX_ISCENSORED) |
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parents:
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|
168 |
|
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|
169 |
# Rewrite all following filelog revisions fixing up offsets and deltas. |
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|
170 |
for srev in xrange(crev + 1, len(flog)): |
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|
171 |
if crev in flog.parentrevs(srev): |
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diff
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|
172 |
# Immediate children of censored node must be re-added as fulltext. |
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|
173 |
try: |
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parents:
diff
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|
174 |
revdata = flog.revision(srev) |
25660
328739ea70c3
global: mass rewrite to use modern exception syntax
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25186
diff
changeset
|
175 |
except error.CensoredNodeError as e: |
24347
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parents:
diff
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|
176 |
revdata = e.tombstone |
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|
177 |
dlen = rewrite(srev, offset, revdata) |
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parents:
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|
178 |
else: |
1bcfecbbf569
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|
179 |
# Copy any other revision data verbatim after fixing up the offset. |
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parents:
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changeset
|
180 |
rewriteindex(srev, offset) |
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|
181 |
dlen = flog.length(srev) |
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diff
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|
182 |
for chunk in util.filechunkiter(dataread, limit=dlen): |
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parents:
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|
183 |
datawrite.write(chunk) |
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parents:
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|
184 |
offset += dlen |
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parents:
diff
changeset
|
185 |
|
1bcfecbbf569
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Mike Edgar <adgar@google.com>
parents:
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|
186 |
idxread.close() |
1bcfecbbf569
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parents:
diff
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|
187 |
idxwrite.close() |
1bcfecbbf569
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parents:
diff
changeset
|
188 |
if dataread is not idxread: |
1bcfecbbf569
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parents:
diff
changeset
|
189 |
dataread.close() |
1bcfecbbf569
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parents:
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|
190 |
datawrite.close() |