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annotate mercurial/requirements.py @ 46626:ee91966aec0f

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requirements: add constant for revlog v1 requirement Since this series is adding a new requirement, we might as well clean up while we're here. Differential Revision: https://phab.mercurial-scm.org/D10105
author Rapha?l Gom?s <rgomes@octobus.net>
date Wed, 03 Mar 2021 14:00:45 +0100
parents 4b0192f592cf
children f4c325bf80fc
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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 Matt Mackall <mpm@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 # When narrowing is finalized and no longer subject to format changes,
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11 # we should move this to just "narrow" or similar.
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12 NARROW_REQUIREMENT = b'narrowhg-experimental'
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13
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14 # Enables sparse working directory usage
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15 SPARSE_REQUIREMENT = b'exp-sparse'
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16
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17 # Enables the internal phase which is used to hide changesets instead
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18 # of stripping them
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19 INTERNAL_PHASE_REQUIREMENT = b'internal-phase'
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20
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21 # Stores manifest in Tree structure
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22 TREEMANIFEST_REQUIREMENT = b'treemanifest'
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23
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24 REVLOGV1_REQUIREMENT = b'revlogv1'
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25
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26 # Increment the sub-version when the revlog v2 format changes to lock out old
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27 # clients.
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28 REVLOGV2_REQUIREMENT = b'exp-revlogv2.1'
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29
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30 # A repository with the sparserevlog feature will have delta chains that
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31 # can spread over a larger span. Sparse reading cuts these large spans into
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32 # pieces, so that each piece isn't too big.
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33 # Without the sparserevlog capability, reading from the repository could use
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34 # huge amounts of memory, because the whole span would be read at once,
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35 # including all the intermediate revisions that aren't pertinent for the chain.
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36 # This is why once a repository has enabled sparse-read, it becomes required.
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37 SPARSEREVLOG_REQUIREMENT = b'sparserevlog'
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38
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39 # A repository with the sidedataflag requirement will allow to store extra
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40 # information for revision without altering their original hashes.
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41 SIDEDATA_REQUIREMENT = b'exp-sidedata-flag'
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42
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43 # A repository with the the copies-sidedata-changeset requirement will store
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44 # copies related information in changeset's sidedata.
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45 COPIESSDC_REQUIREMENT = b'exp-copies-sidedata-changeset'
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46
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47 # The repository use persistent nodemap for the changelog and the manifest.
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48 NODEMAP_REQUIREMENT = b'persistent-nodemap'
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49
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50 # Denotes that the current repository is a share
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51 SHARED_REQUIREMENT = b'shared'
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52
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53 # Denotes that current repository is a share and the shared source path is
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54 # relative to the current repository root path
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55 RELATIVE_SHARED_REQUIREMENT = b'relshared'
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56
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57 # A repository with share implemented safely. The repository has different
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58 # store and working copy requirements i.e. both `.hg/requires` and
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59 # `.hg/store/requires` are present.
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60 SHARESAFE_REQUIREMENT = b'share-safe'
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61
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62 # List of requirements which are working directory specific
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63 # These requirements cannot be shared between repositories if they
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64 # share the same store
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65 # * sparse is a working directory specific functionality and hence working
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66 # directory specific requirement
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67 # * SHARED_REQUIREMENT and RELATIVE_SHARED_REQUIREMENT are requirements which
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68 # represents that the current working copy/repository shares store of another
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69 # repo. Hence both of them should be stored in working copy
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70 # * SHARESAFE_REQUIREMENT needs to be stored in working dir to mark that rest of
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71 # the requirements are stored in store's requires
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72 WORKING_DIR_REQUIREMENTS = {
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73 SPARSE_REQUIREMENT,
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74 SHARED_REQUIREMENT,
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75 RELATIVE_SHARED_REQUIREMENT,
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76 SHARESAFE_REQUIREMENT,
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77 }