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# sqlitestore.py - Storage backend that uses SQLite
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#
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# Copyright 2018 Gregory Szorc <gregory.szorc@gmail.com>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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"""store repository data in SQLite (EXPERIMENTAL)
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The sqlitestore extension enables the storage of repository data in SQLite.
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This extension is HIGHLY EXPERIMENTAL. There are NO BACKWARDS COMPATIBILITY
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GUARANTEES. This means that repositories created with this extension may
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only be usable with the exact version of this extension/Mercurial that was
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used. The extension attempts to enforce this in order to prevent repository
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corruption.
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In addition, several features are not yet supported or have known bugs:
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* Only some data is stored in SQLite. Changeset, manifest, and other repository
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data is not yet stored in SQLite.
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* Transactions are not robust. If the process is aborted at the right time
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during transaction close/rollback, the repository could be in an inconsistent
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state. This problem will diminish once all repository data is tracked by
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SQLite.
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* Bundle repositories do not work (the ability to use e.g.
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`hg -R <bundle-file> log` to automatically overlay a bundle on top of the
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existing repository).
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* Various other features don't work.
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This extension should work for basic clone/pull, update, and commit workflows.
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Some history rewriting operations may fail due to lack of support for bundle
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repositories.
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To use, activate the extension and set the ``storage.new-repo-backend`` config
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option to ``sqlite`` to enable new repositories to use SQLite for storage.
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"""
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# To run the test suite with repos using SQLite by default, execute the
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# following:
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#
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# HGREPOFEATURES="sqlitestore" run-tests.py \
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# --extra-config-opt extensions.sqlitestore= \
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# --extra-config-opt storage.new-repo-backend=sqlite
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from __future__ import absolute_import
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import hashlib
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import sqlite3
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import struct
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import threading
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import zlib
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from mercurial.i18n import _
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from mercurial.node import (
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nullid,
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nullrev,
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short,
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)
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from mercurial.thirdparty import (
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attr,
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)
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from mercurial import (
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ancestor,
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dagop,
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encoding,
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error,
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extensions,
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localrepo,
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mdiff,
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pycompat,
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registrar,
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util,
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verify,
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)
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from mercurial.interfaces import (
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repository,
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util as interfaceutil,
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)
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from mercurial.utils import (
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storageutil,
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)
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try:
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from mercurial import zstd
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zstd.__version__
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except ImportError:
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zstd = None
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configtable = {}
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configitem = registrar.configitem(configtable)
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# experimental config: storage.sqlite.compression
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configitem('storage', 'sqlite.compression',
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default='zstd' if zstd else 'zlib',
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experimental=True)
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# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
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# extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
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# be specifying the version(s) of Mercurial they are tested with, or
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# leave the attribute unspecified.
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testedwith = 'ships-with-hg-core'
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REQUIREMENT = b'exp-sqlite-001'
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REQUIREMENT_ZSTD = b'exp-sqlite-comp-001=zstd'
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REQUIREMENT_ZLIB = b'exp-sqlite-comp-001=zlib'
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REQUIREMENT_NONE = b'exp-sqlite-comp-001=none'
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REQUIREMENT_SHALLOW_FILES = b'exp-sqlite-shallow-files'
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CURRENT_SCHEMA_VERSION = 1
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COMPRESSION_NONE = 1
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COMPRESSION_ZSTD = 2
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COMPRESSION_ZLIB = 3
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FLAG_CENSORED = 1
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FLAG_MISSING_P1 = 2
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FLAG_MISSING_P2 = 4
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CREATE_SCHEMA = [
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# Deltas are stored as content-indexed blobs.
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# compression column holds COMPRESSION_* constant for how the
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# delta is encoded.
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r'CREATE TABLE delta ('
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r' id INTEGER PRIMARY KEY, '
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r' compression INTEGER NOT NULL, '
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r' hash BLOB UNIQUE ON CONFLICT ABORT, '
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r' delta BLOB NOT NULL '
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r')',
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# Tracked paths are denormalized to integers to avoid redundant
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# storage of the path name.
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r'CREATE TABLE filepath ('
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r' id INTEGER PRIMARY KEY, '
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r' path BLOB NOT NULL '
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r')',
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r'CREATE UNIQUE INDEX filepath_path '
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r' ON filepath (path)',
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# We have a single table for all file revision data.
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# Each file revision is uniquely described by a (path, rev) and
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# (path, node).
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#
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# Revision data is stored as a pointer to the delta producing this
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# revision and the file revision whose delta should be applied before
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# that one. One can reconstruct the delta chain by recursively following
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# the delta base revision pointers until one encounters NULL.
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#
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# flags column holds bitwise integer flags controlling storage options.
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# These flags are defined by the FLAG_* constants.
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r'CREATE TABLE fileindex ('
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r' id INTEGER PRIMARY KEY, '
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r' pathid INTEGER REFERENCES filepath(id), '
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r' revnum INTEGER NOT NULL, '
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r' p1rev INTEGER NOT NULL, '
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r' p2rev INTEGER NOT NULL, '
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r' linkrev INTEGER NOT NULL, '
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r' flags INTEGER NOT NULL, '
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r' deltaid INTEGER REFERENCES delta(id), '
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r' deltabaseid INTEGER REFERENCES fileindex(id), '
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r' node BLOB NOT NULL '
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r')',
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r'CREATE UNIQUE INDEX fileindex_pathrevnum '
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r' ON fileindex (pathid, revnum)',
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r'CREATE UNIQUE INDEX fileindex_pathnode '
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r' ON fileindex (pathid, node)',
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# Provide a view over all file data for convenience.
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r'CREATE VIEW filedata AS '
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r'SELECT '
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r' fileindex.id AS id, '
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r' filepath.id AS pathid, '
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r' filepath.path AS path, '
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r' fileindex.revnum AS revnum, '
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r' fileindex.node AS node, '
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r' fileindex.p1rev AS p1rev, '
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r' fileindex.p2rev AS p2rev, '
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r' fileindex.linkrev AS linkrev, '
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r' fileindex.flags AS flags, '
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r' fileindex.deltaid AS deltaid, '
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r' fileindex.deltabaseid AS deltabaseid '
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r'FROM filepath, fileindex '
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r'WHERE fileindex.pathid=filepath.id',
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r'PRAGMA user_version=%d' % CURRENT_SCHEMA_VERSION,
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]
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def resolvedeltachain(db, pathid, node, revisioncache,
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stoprids, zstddctx=None):
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"""Resolve a delta chain for a file node."""
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# TODO the "not in ({stops})" here is possibly slowing down the query
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# because it needs to perform the lookup on every recursive invocation.
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# This could possibly be faster if we created a temporary query with
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# baseid "poisoned" to null and limited the recursive filter to
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# "is not null".
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res = db.execute(
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r'WITH RECURSIVE '
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r' deltachain(deltaid, baseid) AS ('
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r' SELECT deltaid, deltabaseid FROM fileindex '
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r' WHERE pathid=? AND node=? '
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r' UNION ALL '
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r' SELECT fileindex.deltaid, deltabaseid '
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r' FROM fileindex, deltachain '
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r' WHERE '
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r' fileindex.id=deltachain.baseid '
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r' AND deltachain.baseid IS NOT NULL '
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r' AND fileindex.id NOT IN ({stops}) '
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r' ) '
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r'SELECT deltachain.baseid, compression, delta '
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r'FROM deltachain, delta '
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r'WHERE delta.id=deltachain.deltaid'.format(
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stops=r','.join([r'?'] * len(stoprids))),
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tuple([pathid, node] + list(stoprids.keys())))
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deltas = []
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lastdeltabaseid = None
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for deltabaseid, compression, delta in res:
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lastdeltabaseid = deltabaseid
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if compression == COMPRESSION_ZSTD:
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delta = zstddctx.decompress(delta)
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elif compression == COMPRESSION_NONE:
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delta = delta
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elif compression == COMPRESSION_ZLIB:
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delta = zlib.decompress(delta)
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else:
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raise SQLiteStoreError('unhandled compression type: %d' %
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compression)
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deltas.append(delta)
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if lastdeltabaseid in stoprids:
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basetext = revisioncache[stoprids[lastdeltabaseid]]
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else:
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basetext = deltas.pop()
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deltas.reverse()
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fulltext = mdiff.patches(basetext, deltas)
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# SQLite returns buffer instances for blob columns on Python 2. This
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# type can propagate through the delta application layer. Because
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# downstream callers assume revisions are bytes, cast as needed.
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if not isinstance(fulltext, bytes):
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fulltext = bytes(delta)
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return fulltext
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def insertdelta(db, compression, hash, delta):
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try:
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return db.execute(
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r'INSERT INTO delta (compression, hash, delta) '
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r'VALUES (?, ?, ?)',
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(compression, hash, delta)).lastrowid
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except sqlite3.IntegrityError:
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return db.execute(
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r'SELECT id FROM delta WHERE hash=?',
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(hash,)).fetchone()[0]
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class SQLiteStoreError(error.StorageError):
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pass
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@attr.s
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class revisionentry(object):
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rid = attr.ib()
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rev = attr.ib()
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node = attr.ib()
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p1rev = attr.ib()
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p2rev = attr.ib()
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p1node = attr.ib()
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p2node = attr.ib()
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linkrev = attr.ib()
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flags = attr.ib()
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@interfaceutil.implementer(repository.irevisiondelta)
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@attr.s(slots=True)
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class sqliterevisiondelta(object):
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node = attr.ib()
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p1node = attr.ib()
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p2node = attr.ib()
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basenode = attr.ib()
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flags = attr.ib()
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baserevisionsize = attr.ib()
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revision = attr.ib()
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delta = attr.ib()
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linknode = attr.ib(default=None)
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@interfaceutil.implementer(repository.iverifyproblem)
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@attr.s(frozen=True)
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class sqliteproblem(object):
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warning = attr.ib(default=None)
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error = attr.ib(default=None)
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node = attr.ib(default=None)
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@interfaceutil.implementer(repository.ifilestorage)
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class sqlitefilestore(object):
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"""Implements storage for an individual tracked path."""
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def __init__(self, db, path, compression):
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self._db = db
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self._path = path
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self._pathid = None
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# revnum -> node
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self._revtonode = {}
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# node -> revnum
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self._nodetorev = {}
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# node -> data structure
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self._revisions = {}
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self._revisioncache = util.lrucachedict(10)
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self._compengine = compression
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if compression == 'zstd':
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self._cctx = zstd.ZstdCompressor(level=3)
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self._dctx = zstd.ZstdDecompressor()
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else:
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self._cctx = None
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self._dctx = None
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self._refreshindex()
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def _refreshindex(self):
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self._revtonode = {}
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self._nodetorev = {}
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self._revisions = {}
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res = list(self._db.execute(
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r'SELECT id FROM filepath WHERE path=?', (self._path,)))
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if not res:
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self._pathid = None
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return
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self._pathid = res[0][0]
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res = self._db.execute(
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r'SELECT id, revnum, node, p1rev, p2rev, linkrev, flags '
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r'FROM fileindex '
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r'WHERE pathid=? '
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r'ORDER BY revnum ASC',
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(self._pathid,))
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for i, row in enumerate(res):
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rid, rev, node, p1rev, p2rev, linkrev, flags = row
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if i != rev:
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raise SQLiteStoreError(_('sqlite database has inconsistent '
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'revision numbers'))
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if p1rev == nullrev:
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p1node = nullid
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else:
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p1node = self._revtonode[p1rev]
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if p2rev == nullrev:
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p2node = nullid
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else:
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p2node = self._revtonode[p2rev]
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entry = revisionentry(
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rid=rid,
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rev=rev,
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node=node,
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p1rev=p1rev,
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p2rev=p2rev,
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p1node=p1node,
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p2node=p2node,
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linkrev=linkrev,
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flags=flags)
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self._revtonode[rev] = node
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self._nodetorev[node] = rev
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self._revisions[node] = entry
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# Start of ifileindex interface.
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def __len__(self):
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return len(self._revisions)
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def __iter__(self):
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return iter(pycompat.xrange(len(self._revisions)))
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def hasnode(self, node):
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if node == nullid:
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return False
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return node in self._nodetorev
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def revs(self, start=0, stop=None):
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return storageutil.iterrevs(len(self._revisions), start=start,
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stop=stop)
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def parents(self, node):
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if node == nullid:
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return nullid, nullid
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if node not in self._revisions:
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raise error.LookupError(node, self._path, _('no node'))
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entry = self._revisions[node]
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return entry.p1node, entry.p2node
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def parentrevs(self, rev):
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if rev == nullrev:
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return nullrev, nullrev
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if rev not in self._revtonode:
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raise IndexError(rev)
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entry = self._revisions[self._revtonode[rev]]
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return entry.p1rev, entry.p2rev
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def rev(self, node):
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if node == nullid:
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return nullrev
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if node not in self._nodetorev:
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raise error.LookupError(node, self._path, _('no node'))
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return self._nodetorev[node]
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def node(self, rev):
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if rev == nullrev:
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return nullid
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if rev not in self._revtonode:
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raise IndexError(rev)
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return self._revtonode[rev]
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def lookup(self, node):
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return storageutil.fileidlookup(self, node, self._path)
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def linkrev(self, rev):
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if rev == nullrev:
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return nullrev
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if rev not in self._revtonode:
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raise IndexError(rev)
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entry = self._revisions[self._revtonode[rev]]
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return entry.linkrev
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def iscensored(self, rev):
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if rev == nullrev:
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return False
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|
|
if rev not in self._revtonode:
|
|
|
raise IndexError(rev)
|
|
|
|
|
|
return self._revisions[self._revtonode[rev]].flags & FLAG_CENSORED
|
|
|
|
|
|
def commonancestorsheads(self, node1, node2):
|
|
|
rev1 = self.rev(node1)
|
|
|
rev2 = self.rev(node2)
|
|
|
|
|
|
ancestors = ancestor.commonancestorsheads(self.parentrevs, rev1, rev2)
|
|
|
return pycompat.maplist(self.node, ancestors)
|
|
|
|
|
|
def descendants(self, revs):
|
|
|
# TODO we could implement this using a recursive SQL query, which
|
|
|
# might be faster.
|
|
|
return dagop.descendantrevs(revs, self.revs, self.parentrevs)
|
|
|
|
|
|
def heads(self, start=None, stop=None):
|
|
|
if start is None and stop is None:
|
|
|
if not len(self):
|
|
|
return [nullid]
|
|
|
|
|
|
startrev = self.rev(start) if start is not None else nullrev
|
|
|
stoprevs = {self.rev(n) for n in stop or []}
|
|
|
|
|
|
revs = dagop.headrevssubset(self.revs, self.parentrevs,
|
|
|
startrev=startrev, stoprevs=stoprevs)
|
|
|
|
|
|
return [self.node(rev) for rev in revs]
|
|
|
|
|
|
def children(self, node):
|
|
|
rev = self.rev(node)
|
|
|
|
|
|
res = self._db.execute(
|
|
|
r'SELECT'
|
|
|
r' node '
|
|
|
r' FROM filedata '
|
|
|
r' WHERE path=? AND (p1rev=? OR p2rev=?) '
|
|
|
r' ORDER BY revnum ASC',
|
|
|
(self._path, rev, rev))
|
|
|
|
|
|
return [row[0] for row in res]
|
|
|
|
|
|
# End of ifileindex interface.
|
|
|
|
|
|
# Start of ifiledata interface.
|
|
|
|
|
|
def size(self, rev):
|
|
|
if rev == nullrev:
|
|
|
return 0
|
|
|
|
|
|
if rev not in self._revtonode:
|
|
|
raise IndexError(rev)
|
|
|
|
|
|
node = self._revtonode[rev]
|
|
|
|
|
|
if self.renamed(node):
|
|
|
return len(self.read(node))
|
|
|
|
|
|
return len(self.revision(node))
|
|
|
|
|
|
def revision(self, node, raw=False, _verifyhash=True):
|
|
|
if node in (nullid, nullrev):
|
|
|
return b''
|
|
|
|
|
|
if isinstance(node, int):
|
|
|
node = self.node(node)
|
|
|
|
|
|
if node not in self._nodetorev:
|
|
|
raise error.LookupError(node, self._path, _('no node'))
|
|
|
|
|
|
if node in self._revisioncache:
|
|
|
return self._revisioncache[node]
|
|
|
|
|
|
# Because we have a fulltext revision cache, we are able to
|
|
|
# short-circuit delta chain traversal and decompression as soon as
|
|
|
# we encounter a revision in the cache.
|
|
|
|
|
|
stoprids = {self._revisions[n].rid: n
|
|
|
for n in self._revisioncache}
|
|
|
|
|
|
if not stoprids:
|
|
|
stoprids[-1] = None
|
|
|
|
|
|
fulltext = resolvedeltachain(self._db, self._pathid, node,
|
|
|
self._revisioncache, stoprids,
|
|
|
zstddctx=self._dctx)
|
|
|
|
|
|
# Don't verify hashes if parent nodes were rewritten, as the hash
|
|
|
# wouldn't verify.
|
|
|
if self._revisions[node].flags & (FLAG_MISSING_P1 | FLAG_MISSING_P2):
|
|
|
_verifyhash = False
|
|
|
|
|
|
if _verifyhash:
|
|
|
self._checkhash(fulltext, node)
|
|
|
self._revisioncache[node] = fulltext
|
|
|
|
|
|
return fulltext
|
|
|
|
|
|
def rawdata(self, *args, **kwargs):
|
|
|
return self.revision(*args, **kwargs)
|
|
|
|
|
|
def read(self, node):
|
|
|
return storageutil.filtermetadata(self.revision(node))
|
|
|
|
|
|
def renamed(self, node):
|
|
|
return storageutil.filerevisioncopied(self, node)
|
|
|
|
|
|
def cmp(self, node, fulltext):
|
|
|
return not storageutil.filedataequivalent(self, node, fulltext)
|
|
|
|
|
|
def emitrevisions(self, nodes, nodesorder=None, revisiondata=False,
|
|
|
assumehaveparentrevisions=False,
|
|
|
deltamode=repository.CG_DELTAMODE_STD):
|
|
|
if nodesorder not in ('nodes', 'storage', 'linear', None):
|
|
|
raise error.ProgrammingError('unhandled value for nodesorder: %s' %
|
|
|
nodesorder)
|
|
|
|
|
|
nodes = [n for n in nodes if n != nullid]
|
|
|
|
|
|
if not nodes:
|
|
|
return
|
|
|
|
|
|
# TODO perform in a single query.
|
|
|
res = self._db.execute(
|
|
|
r'SELECT revnum, deltaid FROM fileindex '
|
|
|
r'WHERE pathid=? '
|
|
|
r' AND node in (%s)' % (r','.join([r'?'] * len(nodes))),
|
|
|
tuple([self._pathid] + nodes))
|
|
|
|
|
|
deltabases = {}
|
|
|
|
|
|
for rev, deltaid in res:
|
|
|
res = self._db.execute(
|
|
|
r'SELECT revnum from fileindex WHERE pathid=? AND deltaid=?',
|
|
|
(self._pathid, deltaid))
|
|
|
deltabases[rev] = res.fetchone()[0]
|
|
|
|
|
|
# TODO define revdifffn so we can use delta from storage.
|
|
|
for delta in storageutil.emitrevisions(
|
|
|
self, nodes, nodesorder, sqliterevisiondelta,
|
|
|
deltaparentfn=deltabases.__getitem__,
|
|
|
revisiondata=revisiondata,
|
|
|
assumehaveparentrevisions=assumehaveparentrevisions,
|
|
|
deltamode=deltamode):
|
|
|
|
|
|
yield delta
|
|
|
|
|
|
# End of ifiledata interface.
|
|
|
|
|
|
# Start of ifilemutation interface.
|
|
|
|
|
|
def add(self, filedata, meta, transaction, linkrev, p1, p2):
|
|
|
if meta or filedata.startswith(b'\x01\n'):
|
|
|
filedata = storageutil.packmeta(meta, filedata)
|
|
|
|
|
|
return self.addrevision(filedata, transaction, linkrev, p1, p2)
|
|
|
|
|
|
def addrevision(self, revisiondata, transaction, linkrev, p1, p2, node=None,
|
|
|
flags=0, cachedelta=None):
|
|
|
if flags:
|
|
|
raise SQLiteStoreError(_('flags not supported on revisions'))
|
|
|
|
|
|
validatehash = node is not None
|
|
|
node = node or storageutil.hashrevisionsha1(revisiondata, p1, p2)
|
|
|
|
|
|
if validatehash:
|
|
|
self._checkhash(revisiondata, node, p1, p2)
|
|
|
|
|
|
if node in self._nodetorev:
|
|
|
return node
|
|
|
|
|
|
node = self._addrawrevision(node, revisiondata, transaction, linkrev,
|
|
|
p1, p2)
|
|
|
|
|
|
self._revisioncache[node] = revisiondata
|
|
|
return node
|
|
|
|
|
|
def addgroup(self, deltas, linkmapper, transaction, addrevisioncb=None,
|
|
|
maybemissingparents=False):
|
|
|
nodes = []
|
|
|
|
|
|
for node, p1, p2, linknode, deltabase, delta, wireflags in deltas:
|
|
|
storeflags = 0
|
|
|
|
|
|
if wireflags & repository.REVISION_FLAG_CENSORED:
|
|
|
storeflags |= FLAG_CENSORED
|
|
|
|
|
|
if wireflags & ~repository.REVISION_FLAG_CENSORED:
|
|
|
raise SQLiteStoreError('unhandled revision flag')
|
|
|
|
|
|
if maybemissingparents:
|
|
|
if p1 != nullid and not self.hasnode(p1):
|
|
|
p1 = nullid
|
|
|
storeflags |= FLAG_MISSING_P1
|
|
|
|
|
|
if p2 != nullid and not self.hasnode(p2):
|
|
|
p2 = nullid
|
|
|
storeflags |= FLAG_MISSING_P2
|
|
|
|
|
|
baserev = self.rev(deltabase)
|
|
|
|
|
|
# If base is censored, delta must be full replacement in a single
|
|
|
# patch operation.
|
|
|
if baserev != nullrev and self.iscensored(baserev):
|
|
|
hlen = struct.calcsize('>lll')
|
|
|
oldlen = len(self.rawdata(deltabase, _verifyhash=False))
|
|
|
newlen = len(delta) - hlen
|
|
|
|
|
|
if delta[:hlen] != mdiff.replacediffheader(oldlen, newlen):
|
|
|
raise error.CensoredBaseError(self._path,
|
|
|
deltabase)
|
|
|
|
|
|
if (not (storeflags & FLAG_CENSORED)
|
|
|
and storageutil.deltaiscensored(
|
|
|
delta, baserev, lambda x: len(self.rawdata(x)))):
|
|
|
storeflags |= FLAG_CENSORED
|
|
|
|
|
|
linkrev = linkmapper(linknode)
|
|
|
|
|
|
nodes.append(node)
|
|
|
|
|
|
if node in self._revisions:
|
|
|
# Possibly reset parents to make them proper.
|
|
|
entry = self._revisions[node]
|
|
|
|
|
|
if entry.flags & FLAG_MISSING_P1 and p1 != nullid:
|
|
|
entry.p1node = p1
|
|
|
entry.p1rev = self._nodetorev[p1]
|
|
|
entry.flags &= ~FLAG_MISSING_P1
|
|
|
|
|
|
self._db.execute(
|
|
|
r'UPDATE fileindex SET p1rev=?, flags=? '
|
|
|
r'WHERE id=?',
|
|
|
(self._nodetorev[p1], entry.flags, entry.rid))
|
|
|
|
|
|
if entry.flags & FLAG_MISSING_P2 and p2 != nullid:
|
|
|
entry.p2node = p2
|
|
|
entry.p2rev = self._nodetorev[p2]
|
|
|
entry.flags &= ~FLAG_MISSING_P2
|
|
|
|
|
|
self._db.execute(
|
|
|
r'UPDATE fileindex SET p2rev=?, flags=? '
|
|
|
r'WHERE id=?',
|
|
|
(self._nodetorev[p1], entry.flags, entry.rid))
|
|
|
|
|
|
continue
|
|
|
|
|
|
if deltabase == nullid:
|
|
|
text = mdiff.patch(b'', delta)
|
|
|
storedelta = None
|
|
|
else:
|
|
|
text = None
|
|
|
storedelta = (deltabase, delta)
|
|
|
|
|
|
self._addrawrevision(node, text, transaction, linkrev, p1, p2,
|
|
|
storedelta=storedelta, flags=storeflags)
|
|
|
|
|
|
if addrevisioncb:
|
|
|
addrevisioncb(self, node)
|
|
|
|
|
|
return nodes
|
|
|
|
|
|
def censorrevision(self, tr, censornode, tombstone=b''):
|
|
|
tombstone = storageutil.packmeta({b'censored': tombstone}, b'')
|
|
|
|
|
|
# This restriction is cargo culted from revlogs and makes no sense for
|
|
|
# SQLite, since columns can be resized at will.
|
|
|
if len(tombstone) > len(self.rawdata(censornode)):
|
|
|
raise error.Abort(_('censor tombstone must be no longer than '
|
|
|
'censored data'))
|
|
|
|
|
|
# We need to replace the censored revision's data with the tombstone.
|
|
|
# But replacing that data will have implications for delta chains that
|
|
|
# reference it.
|
|
|
#
|
|
|
# While "better," more complex strategies are possible, we do something
|
|
|
# simple: we find delta chain children of the censored revision and we
|
|
|
# replace those incremental deltas with fulltexts of their corresponding
|
|
|
# revision. Then we delete the now-unreferenced delta and original
|
|
|
# revision and insert a replacement.
|
|
|
|
|
|
# Find the delta to be censored.
|
|
|
censoreddeltaid = self._db.execute(
|
|
|
r'SELECT deltaid FROM fileindex WHERE id=?',
|
|
|
(self._revisions[censornode].rid,)).fetchone()[0]
|
|
|
|
|
|
# Find all its delta chain children.
|
|
|
# TODO once we support storing deltas for !files, we'll need to look
|
|
|
# for those delta chains too.
|
|
|
rows = list(self._db.execute(
|
|
|
r'SELECT id, pathid, node FROM fileindex '
|
|
|
r'WHERE deltabaseid=? OR deltaid=?',
|
|
|
(censoreddeltaid, censoreddeltaid)))
|
|
|
|
|
|
for row in rows:
|
|
|
rid, pathid, node = row
|
|
|
|
|
|
fulltext = resolvedeltachain(self._db, pathid, node, {}, {-1: None},
|
|
|
zstddctx=self._dctx)
|
|
|
|
|
|
deltahash = hashlib.sha1(fulltext).digest()
|
|
|
|
|
|
if self._compengine == 'zstd':
|
|
|
deltablob = self._cctx.compress(fulltext)
|
|
|
compression = COMPRESSION_ZSTD
|
|
|
elif self._compengine == 'zlib':
|
|
|
deltablob = zlib.compress(fulltext)
|
|
|
compression = COMPRESSION_ZLIB
|
|
|
elif self._compengine == 'none':
|
|
|
deltablob = fulltext
|
|
|
compression = COMPRESSION_NONE
|
|
|
else:
|
|
|
raise error.ProgrammingError('unhandled compression engine: %s'
|
|
|
% self._compengine)
|
|
|
|
|
|
if len(deltablob) >= len(fulltext):
|
|
|
deltablob = fulltext
|
|
|
compression = COMPRESSION_NONE
|
|
|
|
|
|
deltaid = insertdelta(self._db, compression, deltahash, deltablob)
|
|
|
|
|
|
self._db.execute(
|
|
|
r'UPDATE fileindex SET deltaid=?, deltabaseid=NULL '
|
|
|
r'WHERE id=?', (deltaid, rid))
|
|
|
|
|
|
# Now create the tombstone delta and replace the delta on the censored
|
|
|
# node.
|
|
|
deltahash = hashlib.sha1(tombstone).digest()
|
|
|
tombstonedeltaid = insertdelta(self._db, COMPRESSION_NONE,
|
|
|
deltahash, tombstone)
|
|
|
|
|
|
flags = self._revisions[censornode].flags
|
|
|
flags |= FLAG_CENSORED
|
|
|
|
|
|
self._db.execute(
|
|
|
r'UPDATE fileindex SET flags=?, deltaid=?, deltabaseid=NULL '
|
|
|
r'WHERE pathid=? AND node=?',
|
|
|
(flags, tombstonedeltaid, self._pathid, censornode))
|
|
|
|
|
|
self._db.execute(
|
|
|
r'DELETE FROM delta WHERE id=?', (censoreddeltaid,))
|
|
|
|
|
|
self._refreshindex()
|
|
|
self._revisioncache.clear()
|
|
|
|
|
|
def getstrippoint(self, minlink):
|
|
|
return storageutil.resolvestripinfo(minlink, len(self) - 1,
|
|
|
[self.rev(n) for n in self.heads()],
|
|
|
self.linkrev,
|
|
|
self.parentrevs)
|
|
|
|
|
|
def strip(self, minlink, transaction):
|
|
|
if not len(self):
|
|
|
return
|
|
|
|
|
|
rev, _ignored = self.getstrippoint(minlink)
|
|
|
|
|
|
if rev == len(self):
|
|
|
return
|
|
|
|
|
|
for rev in self.revs(rev):
|
|
|
self._db.execute(
|
|
|
r'DELETE FROM fileindex WHERE pathid=? AND node=?',
|
|
|
(self._pathid, self.node(rev)))
|
|
|
|
|
|
# TODO how should we garbage collect data in delta table?
|
|
|
|
|
|
self._refreshindex()
|
|
|
|
|
|
# End of ifilemutation interface.
|
|
|
|
|
|
# Start of ifilestorage interface.
|
|
|
|
|
|
def files(self):
|
|
|
return []
|
|
|
|
|
|
def storageinfo(self, exclusivefiles=False, sharedfiles=False,
|
|
|
revisionscount=False, trackedsize=False,
|
|
|
storedsize=False):
|
|
|
d = {}
|
|
|
|
|
|
if exclusivefiles:
|
|
|
d['exclusivefiles'] = []
|
|
|
|
|
|
if sharedfiles:
|
|
|
# TODO list sqlite file(s) here.
|
|
|
d['sharedfiles'] = []
|
|
|
|
|
|
if revisionscount:
|
|
|
d['revisionscount'] = len(self)
|
|
|
|
|
|
if trackedsize:
|
|
|
d['trackedsize'] = sum(len(self.revision(node))
|
|
|
for node in self._nodetorev)
|
|
|
|
|
|
if storedsize:
|
|
|
# TODO implement this?
|
|
|
d['storedsize'] = None
|
|
|
|
|
|
return d
|
|
|
|
|
|
def verifyintegrity(self, state):
|
|
|
state['skipread'] = set()
|
|
|
|
|
|
for rev in self:
|
|
|
node = self.node(rev)
|
|
|
|
|
|
try:
|
|
|
self.revision(node)
|
|
|
except Exception as e:
|
|
|
yield sqliteproblem(
|
|
|
error=_('unpacking %s: %s') % (short(node), e),
|
|
|
node=node)
|
|
|
|
|
|
state['skipread'].add(node)
|
|
|
|
|
|
# End of ifilestorage interface.
|
|
|
|
|
|
def _checkhash(self, fulltext, node, p1=None, p2=None):
|
|
|
if p1 is None and p2 is None:
|
|
|
p1, p2 = self.parents(node)
|
|
|
|
|
|
if node == storageutil.hashrevisionsha1(fulltext, p1, p2):
|
|
|
return
|
|
|
|
|
|
try:
|
|
|
del self._revisioncache[node]
|
|
|
except KeyError:
|
|
|
pass
|
|
|
|
|
|
if storageutil.iscensoredtext(fulltext):
|
|
|
raise error.CensoredNodeError(self._path, node, fulltext)
|
|
|
|
|
|
raise SQLiteStoreError(_('integrity check failed on %s') %
|
|
|
self._path)
|
|
|
|
|
|
def _addrawrevision(self, node, revisiondata, transaction, linkrev,
|
|
|
p1, p2, storedelta=None, flags=0):
|
|
|
if self._pathid is None:
|
|
|
res = self._db.execute(
|
|
|
r'INSERT INTO filepath (path) VALUES (?)', (self._path,))
|
|
|
self._pathid = res.lastrowid
|
|
|
|
|
|
# For simplicity, always store a delta against p1.
|
|
|
# TODO we need a lot more logic here to make behavior reasonable.
|
|
|
|
|
|
if storedelta:
|
|
|
deltabase, delta = storedelta
|
|
|
|
|
|
if isinstance(deltabase, int):
|
|
|
deltabase = self.node(deltabase)
|
|
|
|
|
|
else:
|
|
|
assert revisiondata is not None
|
|
|
deltabase = p1
|
|
|
|
|
|
if deltabase == nullid:
|
|
|
delta = revisiondata
|
|
|
else:
|
|
|
delta = mdiff.textdiff(self.revision(self.rev(deltabase)),
|
|
|
revisiondata)
|
|
|
|
|
|
# File index stores a pointer to its delta and the parent delta.
|
|
|
# The parent delta is stored via a pointer to the fileindex PK.
|
|
|
if deltabase == nullid:
|
|
|
baseid = None
|
|
|
else:
|
|
|
baseid = self._revisions[deltabase].rid
|
|
|
|
|
|
# Deltas are stored with a hash of their content. This allows
|
|
|
# us to de-duplicate. The table is configured to ignore conflicts
|
|
|
# and it is faster to just insert and silently noop than to look
|
|
|
# first.
|
|
|
deltahash = hashlib.sha1(delta).digest()
|
|
|
|
|
|
if self._compengine == 'zstd':
|
|
|
deltablob = self._cctx.compress(delta)
|
|
|
compression = COMPRESSION_ZSTD
|
|
|
elif self._compengine == 'zlib':
|
|
|
deltablob = zlib.compress(delta)
|
|
|
compression = COMPRESSION_ZLIB
|
|
|
elif self._compengine == 'none':
|
|
|
deltablob = delta
|
|
|
compression = COMPRESSION_NONE
|
|
|
else:
|
|
|
raise error.ProgrammingError('unhandled compression engine: %s' %
|
|
|
self._compengine)
|
|
|
|
|
|
# Don't store compressed data if it isn't practical.
|
|
|
if len(deltablob) >= len(delta):
|
|
|
deltablob = delta
|
|
|
compression = COMPRESSION_NONE
|
|
|
|
|
|
deltaid = insertdelta(self._db, compression, deltahash, deltablob)
|
|
|
|
|
|
rev = len(self)
|
|
|
|
|
|
if p1 == nullid:
|
|
|
p1rev = nullrev
|
|
|
else:
|
|
|
p1rev = self._nodetorev[p1]
|
|
|
|
|
|
if p2 == nullid:
|
|
|
p2rev = nullrev
|
|
|
else:
|
|
|
p2rev = self._nodetorev[p2]
|
|
|
|
|
|
rid = self._db.execute(
|
|
|
r'INSERT INTO fileindex ('
|
|
|
r' pathid, revnum, node, p1rev, p2rev, linkrev, flags, '
|
|
|
r' deltaid, deltabaseid) '
|
|
|
r' VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)',
|
|
|
(self._pathid, rev, node, p1rev, p2rev, linkrev, flags,
|
|
|
deltaid, baseid)
|
|
|
).lastrowid
|
|
|
|
|
|
entry = revisionentry(
|
|
|
rid=rid,
|
|
|
rev=rev,
|
|
|
node=node,
|
|
|
p1rev=p1rev,
|
|
|
p2rev=p2rev,
|
|
|
p1node=p1,
|
|
|
p2node=p2,
|
|
|
linkrev=linkrev,
|
|
|
flags=flags)
|
|
|
|
|
|
self._nodetorev[node] = rev
|
|
|
self._revtonode[rev] = node
|
|
|
self._revisions[node] = entry
|
|
|
|
|
|
return node
|
|
|
|
|
|
class sqliterepository(localrepo.localrepository):
|
|
|
def cancopy(self):
|
|
|
return False
|
|
|
|
|
|
def transaction(self, *args, **kwargs):
|
|
|
current = self.currenttransaction()
|
|
|
|
|
|
tr = super(sqliterepository, self).transaction(*args, **kwargs)
|
|
|
|
|
|
if current:
|
|
|
return tr
|
|
|
|
|
|
self._dbconn.execute(r'BEGIN TRANSACTION')
|
|
|
|
|
|
def committransaction(_):
|
|
|
self._dbconn.commit()
|
|
|
|
|
|
tr.addfinalize('sqlitestore', committransaction)
|
|
|
|
|
|
return tr
|
|
|
|
|
|
@property
|
|
|
def _dbconn(self):
|
|
|
# SQLite connections can only be used on the thread that created
|
|
|
# them. In most cases, this "just works." However, hgweb uses
|
|
|
# multiple threads.
|
|
|
tid = threading.current_thread().ident
|
|
|
|
|
|
if self._db:
|
|
|
if self._db[0] == tid:
|
|
|
return self._db[1]
|
|
|
|
|
|
db = makedb(self.svfs.join('db.sqlite'))
|
|
|
self._db = (tid, db)
|
|
|
|
|
|
return db
|
|
|
|
|
|
def makedb(path):
|
|
|
"""Construct a database handle for a database at path."""
|
|
|
|
|
|
db = sqlite3.connect(encoding.strfromlocal(path))
|
|
|
db.text_factory = bytes
|
|
|
|
|
|
res = db.execute(r'PRAGMA user_version').fetchone()[0]
|
|
|
|
|
|
# New database.
|
|
|
if res == 0:
|
|
|
for statement in CREATE_SCHEMA:
|
|
|
db.execute(statement)
|
|
|
|
|
|
db.commit()
|
|
|
|
|
|
elif res == CURRENT_SCHEMA_VERSION:
|
|
|
pass
|
|
|
|
|
|
else:
|
|
|
raise error.Abort(_('sqlite database has unrecognized version'))
|
|
|
|
|
|
db.execute(r'PRAGMA journal_mode=WAL')
|
|
|
|
|
|
return db
|
|
|
|
|
|
def featuresetup(ui, supported):
|
|
|
supported.add(REQUIREMENT)
|
|
|
|
|
|
if zstd:
|
|
|
supported.add(REQUIREMENT_ZSTD)
|
|
|
|
|
|
supported.add(REQUIREMENT_ZLIB)
|
|
|
supported.add(REQUIREMENT_NONE)
|
|
|
supported.add(REQUIREMENT_SHALLOW_FILES)
|
|
|
supported.add(repository.NARROW_REQUIREMENT)
|
|
|
|
|
|
def newreporequirements(orig, ui, createopts):
|
|
|
if createopts['backend'] != 'sqlite':
|
|
|
return orig(ui, createopts)
|
|
|
|
|
|
# This restriction can be lifted once we have more confidence.
|
|
|
if 'sharedrepo' in createopts:
|
|
|
raise error.Abort(_('shared repositories not supported with SQLite '
|
|
|
'store'))
|
|
|
|
|
|
# This filtering is out of an abundance of caution: we want to ensure
|
|
|
# we honor creation options and we do that by annotating exactly the
|
|
|
# creation options we recognize.
|
|
|
known = {
|
|
|
'narrowfiles',
|
|
|
'backend',
|
|
|
'shallowfilestore',
|
|
|
}
|
|
|
|
|
|
unsupported = set(createopts) - known
|
|
|
if unsupported:
|
|
|
raise error.Abort(_('SQLite store does not support repo creation '
|
|
|
'option: %s') % ', '.join(sorted(unsupported)))
|
|
|
|
|
|
# Since we're a hybrid store that still relies on revlogs, we fall back
|
|
|
# to using the revlogv1 backend's storage requirements then adding our
|
|
|
# own requirement.
|
|
|
createopts['backend'] = 'revlogv1'
|
|
|
requirements = orig(ui, createopts)
|
|
|
requirements.add(REQUIREMENT)
|
|
|
|
|
|
compression = ui.config('storage', 'sqlite.compression')
|
|
|
|
|
|
if compression == 'zstd' and not zstd:
|
|
|
raise error.Abort(_('storage.sqlite.compression set to "zstd" but '
|
|
|
'zstandard compression not available to this '
|
|
|
'Mercurial install'))
|
|
|
|
|
|
if compression == 'zstd':
|
|
|
requirements.add(REQUIREMENT_ZSTD)
|
|
|
elif compression == 'zlib':
|
|
|
requirements.add(REQUIREMENT_ZLIB)
|
|
|
elif compression == 'none':
|
|
|
requirements.add(REQUIREMENT_NONE)
|
|
|
else:
|
|
|
raise error.Abort(_('unknown compression engine defined in '
|
|
|
'storage.sqlite.compression: %s') % compression)
|
|
|
|
|
|
if createopts.get('shallowfilestore'):
|
|
|
requirements.add(REQUIREMENT_SHALLOW_FILES)
|
|
|
|
|
|
return requirements
|
|
|
|
|
|
@interfaceutil.implementer(repository.ilocalrepositoryfilestorage)
|
|
|
class sqlitefilestorage(object):
|
|
|
"""Repository file storage backed by SQLite."""
|
|
|
def file(self, path):
|
|
|
if path[0] == b'/':
|
|
|
path = path[1:]
|
|
|
|
|
|
if REQUIREMENT_ZSTD in self.requirements:
|
|
|
compression = 'zstd'
|
|
|
elif REQUIREMENT_ZLIB in self.requirements:
|
|
|
compression = 'zlib'
|
|
|
elif REQUIREMENT_NONE in self.requirements:
|
|
|
compression = 'none'
|
|
|
else:
|
|
|
raise error.Abort(_('unable to determine what compression engine '
|
|
|
'to use for SQLite storage'))
|
|
|
|
|
|
return sqlitefilestore(self._dbconn, path, compression)
|
|
|
|
|
|
def makefilestorage(orig, requirements, features, **kwargs):
|
|
|
"""Produce a type conforming to ``ilocalrepositoryfilestorage``."""
|
|
|
if REQUIREMENT in requirements:
|
|
|
if REQUIREMENT_SHALLOW_FILES in requirements:
|
|
|
features.add(repository.REPO_FEATURE_SHALLOW_FILE_STORAGE)
|
|
|
|
|
|
return sqlitefilestorage
|
|
|
else:
|
|
|
return orig(requirements=requirements, features=features, **kwargs)
|
|
|
|
|
|
def makemain(orig, ui, requirements, **kwargs):
|
|
|
if REQUIREMENT in requirements:
|
|
|
if REQUIREMENT_ZSTD in requirements and not zstd:
|
|
|
raise error.Abort(_('repository uses zstandard compression, which '
|
|
|
'is not available to this Mercurial install'))
|
|
|
|
|
|
return sqliterepository
|
|
|
|
|
|
return orig(requirements=requirements, **kwargs)
|
|
|
|
|
|
def verifierinit(orig, self, *args, **kwargs):
|
|
|
orig(self, *args, **kwargs)
|
|
|
|
|
|
# We don't care that files in the store don't align with what is
|
|
|
# advertised. So suppress these warnings.
|
|
|
self.warnorphanstorefiles = False
|
|
|
|
|
|
def extsetup(ui):
|
|
|
localrepo.featuresetupfuncs.add(featuresetup)
|
|
|
extensions.wrapfunction(localrepo, 'newreporequirements',
|
|
|
newreporequirements)
|
|
|
extensions.wrapfunction(localrepo, 'makefilestorage',
|
|
|
makefilestorage)
|
|
|
extensions.wrapfunction(localrepo, 'makemain',
|
|
|
makemain)
|
|
|
extensions.wrapfunction(verify.verifier, '__init__',
|
|
|
verifierinit)
|
|
|
|
|
|
def reposetup(ui, repo):
|
|
|
if isinstance(repo, sqliterepository):
|
|
|
repo._db = None
|
|
|
|
|
|
# TODO check for bundlerepository?
|
|
|
|
