Mercurial > hg
view mercurial/requirements.py @ 48652:6fd9a17c32ab
requirements: add an official `REVLOG_COMPRESSION_ZSTD` const
Such constant was missing and its value was missing from the set of requirements
that needs to be preserved through stream clone. This did not had any
consequence yet as the "bundle 2 does not filter its requirements" is shadowing
the issue.
However we are now in a situation where we can fix this issue. So lets do it
next.
With the preparation work on test, changing the streamreqs value only impact two
tests, where checking the full value seems to remains relevant.
Important note: Since older version of Mercurial used the old `supportedformat`
class attribute to check for stream requirement they supported, older version
will consider this requirements to prevent them from using streaming clone. Even
as they support this requirements for years. Pack for stable will be send to fix
it, but they will have to be backported to older version if needed.
Differential Revision: https://phab.mercurial-scm.org/D12083
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
---|---|
date | Mon, 24 Jan 2022 12:44:20 +0100 |
parents | 66b59fbb0cdd |
children | eb5c33f1d08f |
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# requirements.py - objects and functions related to repository requirements # # Copyright 2005-2007 Olivia Mackall <olivia@selenic.com> # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. from __future__ import absolute_import # obsolete experimental requirements: # - manifestv2: An experimental new manifest format that allowed # for stem compression of long paths. Experiment ended up not # being successful (repository sizes went up due to worse delta # chains), and the code was deleted in 4.6. GENERALDELTA_REQUIREMENT = b'generaldelta' DOTENCODE_REQUIREMENT = b'dotencode' STORE_REQUIREMENT = b'store' FNCACHE_REQUIREMENT = b'fncache' DIRSTATE_V2_REQUIREMENT = b'dirstate-v2' # When narrowing is finalized and no longer subject to format changes, # we should move this to just "narrow" or similar. NARROW_REQUIREMENT = b'narrowhg-experimental' # Enables sparse working directory usage SPARSE_REQUIREMENT = b'exp-sparse' # Enables the internal phase which is used to hide changesets instead # of stripping them INTERNAL_PHASE_REQUIREMENT = b'internal-phase' # Stores manifest in Tree structure TREEMANIFEST_REQUIREMENT = b'treemanifest' REVLOGV1_REQUIREMENT = b'revlogv1' # allow using ZSTD as compression engine for revlog content REVLOG_COMPRESSION_ZSTD = b'revlog-compression-zstd' # Increment the sub-version when the revlog v2 format changes to lock out old # clients. CHANGELOGV2_REQUIREMENT = b'exp-changelog-v2' # Increment the sub-version when the revlog v2 format changes to lock out old # clients. REVLOGV2_REQUIREMENT = b'exp-revlogv2.2' # A repository with the sparserevlog feature will have delta chains that # can spread over a larger span. Sparse reading cuts these large spans into # pieces, so that each piece isn't too big. # Without the sparserevlog capability, reading from the repository could use # huge amounts of memory, because the whole span would be read at once, # including all the intermediate revisions that aren't pertinent for the chain. # This is why once a repository has enabled sparse-read, it becomes required. SPARSEREVLOG_REQUIREMENT = b'sparserevlog' # A repository with the the copies-sidedata-changeset requirement will store # copies related information in changeset's sidedata. COPIESSDC_REQUIREMENT = b'exp-copies-sidedata-changeset' # The repository use persistent nodemap for the changelog and the manifest. NODEMAP_REQUIREMENT = b'persistent-nodemap' # Denotes that the current repository is a share SHARED_REQUIREMENT = b'shared' # Denotes that current repository is a share and the shared source path is # relative to the current repository root path RELATIVE_SHARED_REQUIREMENT = b'relshared' # A repository with share implemented safely. The repository has different # store and working copy requirements i.e. both `.hg/requires` and # `.hg/store/requires` are present. SHARESAFE_REQUIREMENT = b'share-safe' # Bookmarks must be stored in the `store` part of the repository and will be # share accross shares BOOKMARKS_IN_STORE_REQUIREMENT = b'bookmarksinstore' # List of requirements which are working directory specific # These requirements cannot be shared between repositories if they # share the same store # * sparse is a working directory specific functionality and hence working # directory specific requirement # * SHARED_REQUIREMENT and RELATIVE_SHARED_REQUIREMENT are requirements which # represents that the current working copy/repository shares store of another # repo. Hence both of them should be stored in working copy # * SHARESAFE_REQUIREMENT needs to be stored in working dir to mark that rest of # the requirements are stored in store's requires # * DIRSTATE_V2_REQUIREMENT affects .hg/dirstate, of which there is one per # working directory. WORKING_DIR_REQUIREMENTS = { SPARSE_REQUIREMENT, SHARED_REQUIREMENT, RELATIVE_SHARED_REQUIREMENT, SHARESAFE_REQUIREMENT, DIRSTATE_V2_REQUIREMENT, } # List of requirement that impact "stream-clone" (and hardlink clone) and # cannot be changed in such cases. # # requirements not in this list are safe to be altered during stream-clone. # # note: the list is currently inherited from previous code and miss some relevant requirement while containing some irrelevant ones. STREAM_FIXED_REQUIREMENTS = { BOOKMARKS_IN_STORE_REQUIREMENT, CHANGELOGV2_REQUIREMENT, COPIESSDC_REQUIREMENT, DIRSTATE_V2_REQUIREMENT, GENERALDELTA_REQUIREMENT, NODEMAP_REQUIREMENT, REVLOG_COMPRESSION_ZSTD, REVLOGV1_REQUIREMENT, REVLOGV2_REQUIREMENT, SHARESAFE_REQUIREMENT, SPARSEREVLOG_REQUIREMENT, TREEMANIFEST_REQUIREMENT, }