Mercurial > hg
annotate mercurial/node.py @ 47072:4c041c71ec01
revlog: introduce an explicit tracking of what the revlog is about
Since the dawn of time, people have been forced to rely to lossy introspection
of the index filename to determine what the purpose and role of the revlog they
encounter is. This is hacky, error prone, inflexible, abstraction-leaky,
<insert-your-own-complaints-here>.
In f63299ee7e4d Raphaël introduced a new attribute to track this information:
`revlog_kind`. However it is initialized in an odd place and various instances
end up not having it set. In addition is only tracking some of the information
we end up having to introspect in various pieces of code.
So we add a new attribute that holds more data and is more strictly enforced.
This work is done in collaboration with Raphaël.
The `revlog_kind` one will be removed/adapted in the next changeset. We expect
to be able to clean up various existing piece of code and to simplify coming
work around the newer revlog format.
Differential Revision: https://phab.mercurial-scm.org/D10352
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Tue, 06 Apr 2021 05:20:24 +0200 |
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1 # node.py - basic nodeid manipulation for mercurial |
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2 # |
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3 # Copyright 2005, 2006 Olivia Mackall <olivia@selenic.com> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
10263 | 6 # GNU General Public License version 2 or any later version. |
1089 | 7 |
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8 from __future__ import absolute_import |
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9 |
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10 import binascii |
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12 # This ugly style has a noticeable effect in manifest parsing |
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13 hex = binascii.hexlify |
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14 # Adapt to Python 3 API changes. If this ends up showing up in |
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15 # profiles, we can use this version only on Python 3, and forward |
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16 # binascii.unhexlify like we used to on Python 2. |
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17 def bin(s): |
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18 try: |
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19 return binascii.unhexlify(s) |
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20 except binascii.Error as e: |
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21 raise TypeError(e) |
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22 |
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23 |
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24 def short(node): |
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25 return hex(node[:6]) |
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26 |
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28 nullrev = -1 |
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29 |
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30 # pseudo identifier for working directory |
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31 # (experimental, so don't add too many dependencies on it) |
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32 wdirrev = 0x7FFFFFFF |
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33 |
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34 |
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35 class sha1nodeconstants(object): |
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36 nodelen = 20 |
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37 |
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38 # In hex, this is '0000000000000000000000000000000000000000' |
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39 nullid = b"\0" * nodelen |
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40 nullhex = hex(nullid) |
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41 |
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42 # Phony node value to stand-in for new files in some uses of |
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43 # manifests. |
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44 # In hex, this is '2121212121212121212121212121212121212121' |
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45 newnodeid = b'!!!!!!!!!!!!!!!!!!!!' |
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46 # In hex, this is '3030303030303030303030303030306164646564' |
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47 addednodeid = b'000000000000000added' |
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48 # In hex, this is '3030303030303030303030306d6f646966696564' |
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49 modifiednodeid = b'000000000000modified' |
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50 |
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51 wdirfilenodeids = {newnodeid, addednodeid, modifiednodeid} |
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52 |
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53 # pseudo identifier for working directory |
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54 # (experimental, so don't add too many dependencies on it) |
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55 # In hex, this is 'ffffffffffffffffffffffffffffffffffffffff' |
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56 wdirid = b"\xff" * nodelen |
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57 wdirhex = hex(wdirid) |
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58 |
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59 |
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60 # legacy starting point for porting modules |
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61 nullid = sha1nodeconstants.nullid |
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62 nullhex = sha1nodeconstants.nullhex |
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63 newnodeid = sha1nodeconstants.newnodeid |
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64 addednodeid = sha1nodeconstants.addednodeid |
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65 modifiednodeid = sha1nodeconstants.modifiednodeid |
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66 wdirfilenodeids = sha1nodeconstants.wdirfilenodeids |
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67 wdirid = sha1nodeconstants.wdirid |
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68 wdirhex = sha1nodeconstants.wdirhex |