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comparison mercurial/revlogutils/rewrite.py @ 47473:5045ba2a3afd

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censor: split the core of the logic into its own function We now have a "generic" rewrite function (only able to do censoring for now) and a thin wrapper that implement the `censor` API with it. We are now ready to start incorporating strip specific changes. Differential Revision: https://phab.mercurial-scm.org/D10904
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Tue, 22 Jun 2021 22:52:08 +0200
parents c81a5297f185
children b30a53ffbf9b
comparison
equal deleted inserted replaced
47472:c81a5297f185 47473:5045ba2a3afd
125 rl._loadindex() 125 rl._loadindex()
126 126
127 127
128 def v2_censor(revlog, tr, censornode, tombstone=b''): 128 def v2_censor(revlog, tr, censornode, tombstone=b''):
129 """censors a revision in a "version 2" revlog""" 129 """censors a revision in a "version 2" revlog"""
130 # General principle
131 #
132 # We create new revlog files (index/data/sidedata) to copy the content of
133 # the existing data without the censored data.
134 #
135 # We need to recompute new delta for any revision that used the censored
136 # revision as delta base. As the cumulative size of the new delta may be
137 # large, we store them in a temporary file until they are stored in their
138 # final destination.
139 #
140 # All data before the censored data can be blindly copied. The rest needs
141 # to be copied as we go and the associated index entry needs adjustement.
142
143 assert revlog._format_version != REVLOGV0, revlog._format_version 130 assert revlog._format_version != REVLOGV0, revlog._format_version
144 assert revlog._format_version != REVLOGV1, revlog._format_version 131 assert revlog._format_version != REVLOGV1, revlog._format_version
145 132
133 censor_revs = {revlog.rev(censornode)}
134 _rewrite_v2(revlog, tr, censor_revs, tombstone)
135
136
137 def _rewrite_v2(revlog, tr, censor_revs, tombstone=b''):
138 """rewrite a revlog to censor some of its content
139
140 General principle
141
142 We create new revlog files (index/data/sidedata) to copy the content of
143 the existing data without the censored data.
144
145 We need to recompute new delta for any revision that used the censored
146 revision as delta base. As the cumulative size of the new delta may be
147 large, we store them in a temporary file until they are stored in their
148 final destination.
149
150 All data before the censored data can be blindly copied. The rest needs
151 to be copied as we go and the associated index entry needs adjustement.
152 """
153 assert revlog._format_version != REVLOGV0, revlog._format_version
154 assert revlog._format_version != REVLOGV1, revlog._format_version
155
146 old_index = revlog.index 156 old_index = revlog.index
147 docket = revlog._docket 157 docket = revlog._docket
148 158
149 censor_revs = {revlog.rev(censornode)}
150 tombstone = storageutil.packmeta({b'censored': tombstone}, b'') 159 tombstone = storageutil.packmeta({b'censored': tombstone}, b'')
151 160
152 first_excl_rev = min(censor_revs) 161 first_excl_rev = min(censor_revs)
153 162
154 first_excl_entry = revlog.index[first_excl_rev] 163 first_excl_entry = revlog.index[first_excl_rev]