mercurial/manifest.py
author mason@suse.com
Tue, 04 Apr 2006 16:38:43 -0400
changeset 2072 74d3f5336b66
parent 1651 cf40d2a30fef
child 2142 8a1e2a9c7013
permissions -rw-r--r--
Implement revlogng. revlogng results in smaller indexes, can address larger data files, and supports flags and version numbers. By default the original revlog format is used. To use the new format, use the following .hgrc field: [revlog] # format choices are 0 (classic revlog format) and 1 revlogng format=1
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# manifest.py - manifest revision class for mercurial
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#
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# Copyright 2005 Matt Mackall <mpm@selenic.com>
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#
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# This software may be used and distributed according to the terms
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# of the GNU General Public License, incorporated herein by reference.
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import struct
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from revlog import *
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from i18n import gettext as _
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from demandload import *
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demandload(globals(), "bisect array")
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class manifest(revlog):
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    def __init__(self, opener, defversion=0):
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        self.mapcache = None
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        self.listcache = None
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        revlog.__init__(self, opener, "00manifest.i", "00manifest.d",
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                        defversion)
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    def read(self, node):
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        if node == nullid: return {} # don't upset local cache
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        if self.mapcache and self.mapcache[0] == node:
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            return self.mapcache[1]
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        text = self.revision(node)
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        map = {}
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        flag = {}
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        self.listcache = array.array('c', text)
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        lines = text.splitlines(1)
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        for l in lines:
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            (f, n) = l.split('\0')
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            map[f] = bin(n[:40])
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            flag[f] = (n[40:-1] == "x")
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        self.mapcache = (node, map, flag)
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        return map
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    def readflags(self, node):
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        if node == nullid: return {} # don't upset local cache
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        if not self.mapcache or self.mapcache[0] != node:
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            self.read(node)
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        return self.mapcache[2]
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    def diff(self, a, b):
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        return mdiff.textdiff(str(a), str(b))
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    def add(self, map, flags, transaction, link, p1=None, p2=None,
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            changed=None):
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        # returns a tuple (start, end).  If the string is found
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        # m[start:end] are the line containing that string.  If start == end
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        # the string was not found and they indicate the proper sorted 
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        # insertion point.  This was taken from bisect_left, and modified
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        # to find line start/end as it goes along.
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        #
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        # m should be a buffer or a string
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        # s is a string
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        #
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        def manifestsearch(m, s, lo=0, hi=None):
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            def advance(i, c):
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                while i < lenm and m[i] != c:
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                    i += 1
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                return i
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            lenm = len(m)
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            if not hi:
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                hi = lenm
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            while lo < hi:
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                mid = (lo + hi) // 2
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                start = mid
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                while start > 0 and m[start-1] != '\n':
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                    start -= 1
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                end = advance(start, '\0')
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                if m[start:end] < s:
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                    # we know that after the null there are 40 bytes of sha1
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                    # this translates to the bisect lo = mid + 1
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                    lo = advance(end + 40, '\n') + 1
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                else:
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                    # this translates to the bisect hi = mid
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                    hi = start
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            end = advance(lo, '\0')
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            found = m[lo:end]
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            if cmp(s, found) == 0: 
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                # we know that after the null there are 40 bytes of sha1
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                end = advance(end + 40, '\n')
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                return (lo, end+1)
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            else:
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                return (lo, lo)
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        # apply the changes collected during the bisect loop to our addlist
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        # return a delta suitable for addrevision
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        def addlistdelta(addlist, x):
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            # start from the bottom up
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            # so changes to the offsets don't mess things up.
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            i = len(x)
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            while i > 0:
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                i -= 1
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                start = x[i][0]
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                end = x[i][1]
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                if x[i][2]:
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                    addlist[start:end] = array.array('c', x[i][2])
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                else:
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                    del addlist[start:end]
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            return "".join([struct.pack(">lll", d[0], d[1], len(d[2])) + d[2] \
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                            for d in x ])
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        # if we're using the listcache, make sure it is valid and
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        # parented by the same node we're diffing against
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        if not changed or not self.listcache or not p1 or \
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               self.mapcache[0] != p1:
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            files = map.keys()
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            files.sort()
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            # if this is changed to support newlines in filenames,
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            # be sure to check the templates/ dir again (especially *-raw.tmpl)
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            text = ["%s\000%s%s\n" %
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                            (f, hex(map[f]), flags[f] and "x" or '')
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                            for f in files]
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            self.listcache = array.array('c', "".join(text))
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            cachedelta = None
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        else:
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            addlist = self.listcache
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            # combine the changed lists into one list for sorting
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            work = [[x, 0] for x in changed[0]]
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            work[len(work):] = [[x, 1] for x in changed[1]]
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            work.sort()
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            delta = []
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            dstart = None
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            dend = None
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            dline = [""]
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            start = 0
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            # zero copy representation of addlist as a buffer
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            addbuf = buffer(addlist)
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            # start with a readonly loop that finds the offset of
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            # each line and creates the deltas
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            for w in work:
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                f = w[0]
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                # bs will either be the index of the item or the insert point
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                start, end = manifestsearch(addbuf, f, start)
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                if w[1] == 0:
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                    l = "%s\000%s%s\n" % (f, hex(map[f]),
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                                          flags[f] and "x" or '')
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                else:
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                    l = ""
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                if start == end and w[1] == 1:
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                    # item we want to delete was not found, error out
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                    raise AssertionError(
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                            _("failed to remove %s from manifest\n") % f)
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                if dstart != None and dstart <= start and dend >= start:
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                    if dend < end:
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                        dend = end
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                    if l:
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                        dline.append(l)
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                else:
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                    if dstart != None:
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                        delta.append([dstart, dend, "".join(dline)])
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                    dstart = start
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                    dend = end
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                    dline = [l]
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            if dstart != None:
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                delta.append([dstart, dend, "".join(dline)])
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            # apply the delta to the addlist, and get a delta for addrevision
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            cachedelta = addlistdelta(addlist, delta)
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            # the delta is only valid if we've been processing the tip revision
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            if self.mapcache[0] != self.tip():
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                cachedelta = None
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            self.listcache = addlist
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        n = self.addrevision(buffer(self.listcache), transaction, link, p1,  \
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                             p2, cachedelta)
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        self.mapcache = (n, map, flags)
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        return n