Mercurial > hg
annotate mercurial/requirements.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 |
parents | d4ba4d51f85f |
children | 21b3e6116bd1 |
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1 # requirements.py - objects and functions related to repository requirements |
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2 # |
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3 # Copyright 2005-2007 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 |
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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 GENERALDELTA_REQUIREMENT = b'generaldelta' |
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11 DOTENCODE_REQUIREMENT = b'dotencode' |
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12 STORE_REQUIREMENT = b'store' |
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13 FNCACHE_REQUIREMENT = b'fncache' |
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14 |
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15 # When narrowing is finalized and no longer subject to format changes, |
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16 # we should move this to just "narrow" or similar. |
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17 NARROW_REQUIREMENT = b'narrowhg-experimental' |
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18 |
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19 # Enables sparse working directory usage |
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20 SPARSE_REQUIREMENT = b'exp-sparse' |
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21 |
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22 # Enables the internal phase which is used to hide changesets instead |
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23 # of stripping them |
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24 INTERNAL_PHASE_REQUIREMENT = b'internal-phase' |
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25 |
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26 # Stores manifest in Tree structure |
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27 TREEMANIFEST_REQUIREMENT = b'treemanifest' |
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28 |
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29 REVLOGV1_REQUIREMENT = b'revlogv1' |
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30 |
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31 # Increment the sub-version when the revlog v2 format changes to lock out old |
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32 # clients. |
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33 REVLOGV2_REQUIREMENT = b'exp-revlogv2.2' |
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34 |
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35 # A repository with the sparserevlog feature will have delta chains that |
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36 # can spread over a larger span. Sparse reading cuts these large spans into |
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37 # pieces, so that each piece isn't too big. |
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38 # Without the sparserevlog capability, reading from the repository could use |
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39 # huge amounts of memory, because the whole span would be read at once, |
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40 # including all the intermediate revisions that aren't pertinent for the chain. |
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41 # This is why once a repository has enabled sparse-read, it becomes required. |
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42 SPARSEREVLOG_REQUIREMENT = b'sparserevlog' |
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43 |
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44 # A repository with the sidedataflag requirement will allow to store extra |
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45 # information for revision without altering their original hashes. |
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46 SIDEDATA_REQUIREMENT = b'exp-sidedata-flag' |
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47 |
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48 # A repository with the the copies-sidedata-changeset requirement will store |
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49 # copies related information in changeset's sidedata. |
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50 COPIESSDC_REQUIREMENT = b'exp-copies-sidedata-changeset' |
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51 |
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52 # The repository use persistent nodemap for the changelog and the manifest. |
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53 NODEMAP_REQUIREMENT = b'persistent-nodemap' |
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54 |
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55 # Denotes that the current repository is a share |
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56 SHARED_REQUIREMENT = b'shared' |
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57 |
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58 # Denotes that current repository is a share and the shared source path is |
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59 # relative to the current repository root path |
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60 RELATIVE_SHARED_REQUIREMENT = b'relshared' |
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61 |
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62 # A repository with share implemented safely. The repository has different |
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63 # store and working copy requirements i.e. both `.hg/requires` and |
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64 # `.hg/store/requires` are present. |
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65 SHARESAFE_REQUIREMENT = b'share-safe' |
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66 |
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67 # List of requirements which are working directory specific |
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68 # These requirements cannot be shared between repositories if they |
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69 # share the same store |
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70 # * sparse is a working directory specific functionality and hence working |
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71 # directory specific requirement |
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72 # * SHARED_REQUIREMENT and RELATIVE_SHARED_REQUIREMENT are requirements which |
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73 # represents that the current working copy/repository shares store of another |
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74 # repo. Hence both of them should be stored in working copy |
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75 # * SHARESAFE_REQUIREMENT needs to be stored in working dir to mark that rest of |
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76 # the requirements are stored in store's requires |
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77 WORKING_DIR_REQUIREMENTS = { |
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78 SPARSE_REQUIREMENT, |
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79 SHARED_REQUIREMENT, |
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80 RELATIVE_SHARED_REQUIREMENT, |
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81 SHARESAFE_REQUIREMENT, |
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82 } |