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# changelog.py - changelog class for mercurial
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#
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# Copyright 2005-2007 Matt Mackall <mpm@selenic.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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from node import bin, hex, nullid
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from i18n import _
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import util, error, revlog, encoding
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def _string_escape(text):
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"""
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>>> d = {'nl': chr(10), 'bs': chr(92), 'cr': chr(13), 'nul': chr(0)}
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>>> s = "ab%(nl)scd%(bs)s%(bs)sn%(nul)sab%(cr)scd%(bs)s%(nl)s" % d
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>>> s
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'ab\\ncd\\\\\\\\n\\x00ab\\rcd\\\\\\n'
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>>> res = _string_escape(s)
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>>> s == res.decode('string_escape')
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True
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"""
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# subset of the string_escape codec
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text = text.replace('\\', '\\\\').replace('\n', '\\n').replace('\r', '\\r')
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return text.replace('\0', '\\0')
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def decodeextra(text):
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extra = {}
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for l in text.split('\0'):
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if l:
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k, v = l.decode('string_escape').split(':', 1)
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extra[k] = v
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return extra
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def encodeextra(d):
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# keys must be sorted to produce a deterministic changelog entry
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items = [_string_escape('%s:%s' % (k, d[k])) for k in sorted(d)]
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return "\0".join(items)
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class appender(object):
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'''the changelog index must be updated last on disk, so we use this class
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to delay writes to it'''
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def __init__(self, fp, buf):
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self.data = buf
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self.fp = fp
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self.offset = fp.tell()
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self.size = util.fstat(fp).st_size
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def end(self):
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return self.size + len("".join(self.data))
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def tell(self):
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return self.offset
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def flush(self):
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pass
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def close(self):
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self.fp.close()
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def seek(self, offset, whence=0):
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'''virtual file offset spans real file and data'''
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if whence == 0:
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self.offset = offset
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elif whence == 1:
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self.offset += offset
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elif whence == 2:
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self.offset = self.end() + offset
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if self.offset < self.size:
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self.fp.seek(self.offset)
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def read(self, count=-1):
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'''only trick here is reads that span real file and data'''
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ret = ""
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if self.offset < self.size:
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s = self.fp.read(count)
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ret = s
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self.offset += len(s)
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if count > 0:
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count -= len(s)
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if count != 0:
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doff = self.offset - self.size
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self.data.insert(0, "".join(self.data))
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del self.data[1:]
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s = self.data[0][doff:doff + count]
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self.offset += len(s)
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ret += s
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return ret
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def write(self, s):
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self.data.append(str(s))
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self.offset += len(s)
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def delayopener(opener, target, divert, buf):
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def o(name, mode='r'):
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if name != target:
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return opener(name, mode)
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if divert:
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return opener(name + ".a", mode.replace('a', 'w'))
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# otherwise, divert to memory
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return appender(opener(name, mode), buf)
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return o
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class changelog(revlog.revlog):
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def __init__(self, opener):
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revlog.revlog.__init__(self, opener, "00changelog.i")
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self._realopener = opener
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self._delayed = False
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self._divert = False
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def delayupdate(self):
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"delay visibility of index updates to other readers"
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self._delayed = True
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self._divert = (len(self) == 0)
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self._delaybuf = []
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self.opener = delayopener(self._realopener, self.indexfile,
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self._divert, self._delaybuf)
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def finalize(self, tr):
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"finalize index updates"
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self._delayed = False
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self.opener = self._realopener
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# move redirected index data back into place
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if self._divert:
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n = self.opener(self.indexfile + ".a").name
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util.rename(n, n[:-2])
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elif self._delaybuf:
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fp = self.opener(self.indexfile, 'a')
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fp.write("".join(self._delaybuf))
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fp.close()
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self._delaybuf = []
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# split when we're done
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self.checkinlinesize(tr)
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def readpending(self, file):
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r = revlog.revlog(self.opener, file)
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self.index = r.index
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self.nodemap = r.nodemap
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self._chunkcache = r._chunkcache
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def writepending(self):
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"create a file containing the unfinalized state for pretxnchangegroup"
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if self._delaybuf:
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# make a temporary copy of the index
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fp1 = self._realopener(self.indexfile)
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fp2 = self._realopener(self.indexfile + ".a", "w")
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fp2.write(fp1.read())
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# add pending data
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fp2.write("".join(self._delaybuf))
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fp2.close()
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# switch modes so finalize can simply rename
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self._delaybuf = []
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self._divert = True
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if self._divert:
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return True
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return False
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def checkinlinesize(self, tr, fp=None):
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if not self._delayed:
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revlog.revlog.checkinlinesize(self, tr, fp)
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def read(self, node):
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"""
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format used:
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nodeid\n : manifest node in ascii
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user\n : user, no \n or \r allowed
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time tz extra\n : date (time is int or float, timezone is int)
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: extra is metadatas, encoded and separated by '\0'
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: older versions ignore it
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files\n\n : files modified by the cset, no \n or \r allowed
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(.*) : comment (free text, ideally utf-8)
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changelog v0 doesn't use extra
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"""
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text = self.revision(node)
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if not text:
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return (nullid, "", (0, 0), [], "", {'branch': 'default'})
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last = text.index("\n\n")
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desc = encoding.tolocal(text[last + 2:])
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l = text[:last].split('\n')
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manifest = bin(l[0])
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user = encoding.tolocal(l[1])
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extra_data = l[2].split(' ', 2)
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if len(extra_data) != 3:
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time = float(extra_data.pop(0))
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try:
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# various tools did silly things with the time zone field.
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timezone = int(extra_data[0])
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except:
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timezone = 0
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extra = {}
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else:
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time, timezone, extra = extra_data
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time, timezone = float(time), int(timezone)
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extra = decodeextra(extra)
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if not extra.get('branch'):
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extra['branch'] = 'default'
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files = l[3:]
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return (manifest, user, (time, timezone), files, desc, extra)
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def add(self, manifest, files, desc, transaction, p1, p2,
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user, date=None, extra=None):
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user = user.strip()
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# An empty username or a username with a "\n" will make the
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# revision text contain two "\n\n" sequences -> corrupt
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# repository since read cannot unpack the revision.
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if not user:
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raise error.RevlogError(_("empty username"))
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if "\n" in user:
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raise error.RevlogError(_("username %s contains a newline")
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% repr(user))
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# strip trailing whitespace and leading and trailing empty lines
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desc = '\n'.join([l.rstrip() for l in desc.splitlines()]).strip('\n')
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user, desc = encoding.fromlocal(user), encoding.fromlocal(desc)
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if date:
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parseddate = "%d %d" % util.parsedate(date)
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else:
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parseddate = "%d %d" % util.makedate()
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if extra:
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branch = extra.get("branch")
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if branch in ("default", ""):
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del extra["branch"]
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elif branch in (".", "null", "tip"):
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raise error.RevlogError(_('the name \'%s\' is reserved')
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% branch)
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if extra:
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extra = encodeextra(extra)
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parseddate = "%s %s" % (parseddate, extra)
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l = [hex(manifest), user, parseddate] + sorted(files) + ["", desc]
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text = "\n".join(l)
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return self.addrevision(text, transaction, len(self), p1, p2)
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