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revlog: add shallow header flag

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REVLOGSHALLOW header flag to mark revlog as shallow.
The _shallow attribute of the revlog is used to check if the header flag is set.
This commit is contained in:
Vishakh H 2010-08-03 19:38:19 +05:30
parent 22c7674a18
commit 04014eeaa3
1 changed files with 11 additions and 3 deletions
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14
mercurial/revlog.py
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@ -23,13 +23,17 @@ _compress = zlib.compress
_decompress = zlib.decompress
_sha = util.sha1
# revlog flags
# revlog header flags
REVLOGV0 = 0
REVLOGNG = 1
REVLOGNGINLINEDATA = (1 << 16)
REVLOGSHALLOW = (1 << 17)
REVLOG_DEFAULT_FLAGS = REVLOGNGINLINEDATA
REVLOG_DEFAULT_FORMAT = REVLOGNG
REVLOG_DEFAULT_VERSION = REVLOG_DEFAULT_FORMAT | REVLOG_DEFAULT_FLAGS
REVLOGNG_FLAGS = REVLOGNGINLINEDATA | REVLOGSHALLOW
# revlog index flags
REVIDX_PUNCHED_FLAG = 2
REVIDX_KNOWN_FLAGS = REVIDX_PUNCHED_FLAG
@ -422,7 +426,7 @@ class revlog(object):
remove data, and can use some simple techniques to avoid the need
for locking while reading.
"""
def __init__(self, opener, indexfile):
def __init__(self, opener, indexfile, shallowroot=None):
"""
create a revlog object
@ -436,12 +440,15 @@ class revlog(object):
self._chunkcache = (0, '')
self.nodemap = {nullid: nullrev}
self.index = []
self._shallowroot = shallowroot
v = REVLOG_DEFAULT_VERSION
if hasattr(opener, 'options') and 'defversion' in opener.options:
v = opener.options['defversion']
if v & REVLOGNG:
v |= REVLOGNGINLINEDATA
if shallowroot:
v |= REVLOGSHALLOW
i = ''
try:
@ -458,12 +465,13 @@ class revlog(object):
self.version = v
self._inline = v & REVLOGNGINLINEDATA
self._shallow = v & REVLOGSHALLOW
flags = v & ~0xFFFF
fmt = v & 0xFFFF
if fmt == REVLOGV0 and flags:
raise RevlogError(_("index %s unknown flags %#04x for format v0")
% (self.indexfile, flags >> 16))
elif fmt == REVLOGNG and flags & ~REVLOGNGINLINEDATA:
elif fmt == REVLOGNG and flags & ~REVLOGNG_FLAGS:
raise RevlogError(_("index %s unknown flags %#04x for revlogng")
% (self.indexfile, flags >> 16))
elif fmt > REVLOGNG: