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annotate mercurial/requirements.py @ 47274:6c84fc9c9a90

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changelogv2: introduce a "changelogv2" feature Right now, this means using revlogv2, but only for the changelog. We will have the format more unique in future changesets. Differential Revision: https://phab.mercurial-scm.org/D10660
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Mon, 29 Mar 2021 22:40:54 +0200
parents 21b3e6116bd1
children ed0d54b20c5b
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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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29 REVLOGV1_REQUIREMENT = b'revlogv1'
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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 CHANGELOGV2_REQUIREMENT = b'exp-changelog-v2'
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34
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35 # Increment the sub-version when the revlog v2 format changes to lock out old
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36 # clients.
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37 REVLOGV2_REQUIREMENT = b'exp-revlogv2.2'
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38
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39 # A repository with the sparserevlog feature will have delta chains that
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40 # can spread over a larger span. Sparse reading cuts these large spans into
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41 # pieces, so that each piece isn't too big.
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42 # Without the sparserevlog capability, reading from the repository could use
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43 # huge amounts of memory, because the whole span would be read at once,
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44 # including all the intermediate revisions that aren't pertinent for the chain.
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45 # This is why once a repository has enabled sparse-read, it becomes required.
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46 SPARSEREVLOG_REQUIREMENT = b'sparserevlog'
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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 }