Mercurial > hgsubversion
diff hgsubversion/maps.py @ 1478:797c7b58a735
maps: add a config option to tweak sqlite
Sqlite is highly configurable by PRAGMA statements [1]. This patch adds
a config option to give the user changes to tweak them.
[1]: https://www.sqlite.org/pragma.html
| author | Jun Wu <quark@fb.com> |
|---|---|
| date | Thu, 23 Jun 2016 20:03:30 +0100 |
| parents | a4f77acf7051 |
| children | bc73b80baf98 |
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--- a/hgsubversion/maps.py +++ b/hgsubversion/maps.py @@ -558,7 +558,7 @@ class SqliteRevMap(collections.MutableMa rowcount = util.fileproperty('_rowcount', lambda x: x._rowcountpath, default=0, deserializer=int) - def __init__(self, revmap_path, lastpulled_path): + def __init__(self, revmap_path, lastpulled_path, sqlitepragmas=None): self._filepath = revmap_path self._dbpath = revmap_path + '.db' self._rowcountpath = self._dbpath + '.rowcount' @@ -566,6 +566,7 @@ class SqliteRevMap(collections.MutableMa self._db = None self._hashes = None + self._sqlitepragmas = sqlitepragmas self.firstpulled = 0 self._updatefirstlastpulled() # __iter__ is expensive and thus disabled by default @@ -720,6 +721,12 @@ class SqliteRevMap(collections.MutableMa cachesize += os.stat(path).st_size * ratio // 1000 self._db.execute('PRAGMA cache_size=%d' % (-cachesize)) + # PRAGMA statements provided by the user + for pragma in (self._sqlitepragmas or []): + # drop malicious ones + if re.match(r'\A\w+=\w+\Z', pragma): + self._db.execute('PRAGMA %s' % pragma) + # disable auto-commit. everything is inside a transaction self._db.isolation_level = 'DEFERRED'