tests/test-storage.py
author Augie Fackler <augie@google.com>
Mon, 08 Jul 2019 13:12:20 -0400
branchstable
changeset 42562 97ada9b8d51b
parent 40453 1bf3e6041e2c
child 43076 2372284d9457
permissions -rw-r--r--
posix: always seek to EOF when opening a file in append mode Python 3 already does this, so skip it there. Consider the program: #include <stdio.h> int main() { FILE *f = fopen("narf", "w"); fprintf(f, "narf\n"); fclose(f); f = fopen("narf", "a"); printf("%ld\n", ftell(f)); fprintf(f, "troz\n"); printf("%ld\n", ftell(f)); return 0; } on macOS, FreeBSD, and Linux with glibc, this program prints 5 10 but on musl libc (Alpine Linux and probably others) this prints 0 10 By my reading of https://pubs.opengroup.org/onlinepubs/009695399/functions/fopen.html this is technically correct, specifically: > Opening a file with append mode (a as the first character in the > mode argument) shall cause all subsequent writes to the file to be > forced to the then current end-of-file, regardless of intervening > calls to fseek(). in other words, the file position doesn't really matter in append-mode files, and we can't depend on it being at all meaningful unless we perform a seek() before tell() after open(..., 'a'). Experimentally after a .write() we can do a .tell() and it'll always be reasonable, but I'm unclear from reading the specification if that's a smart thing to rely on. This matches what we do on Windows and what Python 3 does for free, so let's just be consistent. Thanks to Yuya for the idea.
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# This test verifies the conformance of various classes to various
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# storage interfaces.
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from __future__ import absolute_import
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import silenttestrunner
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from mercurial import (
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    error,
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    filelog,
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    revlog,
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    transaction,
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    ui as uimod,
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    vfs as vfsmod,
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)
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from mercurial.testing import (
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    storage as storagetesting,
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)
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try:
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    from hgext import (
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        sqlitestore,
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    )
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except ImportError:
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    sqlitestore = None
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try:
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    import sqlite3
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    if sqlite3.sqlite_version_info < (3, 8, 3):
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        # WITH clause not supported
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        sqlitestore = None
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except ImportError:
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    pass
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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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STATE = {
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    'lastindex': 0,
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    'ui': uimod.ui(),
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    'vfs': vfsmod.vfs(b'.', realpath=True),
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}
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def makefilefn(self):
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    """Factory for filelog instances."""
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    fl = filelog.filelog(STATE['vfs'], b'filelog-%d' % STATE['lastindex'])
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    STATE['lastindex'] += 1
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    return fl
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def maketransaction(self):
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    vfsmap = {b'plain': STATE['vfs'], b'store': STATE['vfs']}
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    return transaction.transaction(STATE['ui'].warn, STATE['vfs'], vfsmap,
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                                   b'journal', b'undo')
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def addrawrevision(self, fl, tr, node, p1, p2, linkrev, rawtext=None,
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                   delta=None, censored=False, ellipsis=False, extstored=False):
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    flags = 0
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    if censored:
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        flags |= revlog.REVIDX_ISCENSORED
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    if ellipsis:
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        flags |= revlog.REVIDX_ELLIPSIS
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    if extstored:
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        flags |= revlog.REVIDX_EXTSTORED
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    if rawtext is not None:
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        fl._revlog.addrawrevision(rawtext, tr, linkrev, p1, p2, node, flags)
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    elif delta is not None:
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        fl._revlog.addrawrevision(rawtext, tr, linkrev, p1, p2, node, flags,
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                                  cachedelta=delta)
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    else:
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        raise error.Abort('must supply rawtext or delta arguments')
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    # We may insert bad data. Clear caches to prevent e.g. cache hits to
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    # bypass hash verification.
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    fl._revlog.clearcaches()
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# Assigning module-level attributes that inherit from unittest.TestCase
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# is all that is needed to register tests.
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filelogindextests = storagetesting.makeifileindextests(makefilefn,
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                                                       maketransaction,
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                                                       addrawrevision)
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filelogdatatests = storagetesting.makeifiledatatests(makefilefn,
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                                                     maketransaction,
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                                                     addrawrevision)
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filelogmutationtests = storagetesting.makeifilemutationtests(makefilefn,
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                                                             maketransaction,
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                                                             addrawrevision)
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def makesqlitefile(self):
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    path = STATE['vfs'].join(b'db-%d.db' % STATE['lastindex'])
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    STATE['lastindex'] += 1
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    db = sqlitestore.makedb(path)
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    compression = b'zstd' if zstd else b'zlib'
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    return sqlitestore.sqlitefilestore(db, b'dummy-path', compression)
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def addrawrevisionsqlite(self, fl, tr, node, p1, p2, linkrev, rawtext=None,
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                         delta=None, censored=False, ellipsis=False,
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                         extstored=False):
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    flags = 0
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    if censored:
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        flags |= sqlitestore.FLAG_CENSORED
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    if ellipsis | extstored:
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        raise error.Abort(b'support for ellipsis and extstored flags not '
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                          b'supported')
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    if rawtext is not None:
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        fl._addrawrevision(node, rawtext, tr, linkrev, p1, p2, flags=flags)
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    elif delta is not None:
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        fl._addrawrevision(node, rawtext, tr, linkrev, p1, p2,
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                           storedelta=delta, flags=flags)
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    else:
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        raise error.Abort(b'must supply rawtext or delta arguments')
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if sqlitestore is not None:
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    sqlitefileindextests = storagetesting.makeifileindextests(
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        makesqlitefile, maketransaction, addrawrevisionsqlite)
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    sqlitefiledatatests = storagetesting.makeifiledatatests(
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        makesqlitefile, maketransaction, addrawrevisionsqlite)
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    sqlitefilemutationtests = storagetesting.makeifilemutationtests(
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        makesqlitefile, maketransaction, addrawrevisionsqlite)
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if __name__ == '__main__':
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    silenttestrunner.main(__name__)