dirstate: make sure we read the dirstate before setting parents

mercurial/dirstate.py

@@ -1,424 +1,426
 """
 dirstate.py - working directory tracking for mercurial
 
 Copyright 2005 Matt Mackall <[e-mail]>
 
 This software may be used and distributed according to the terms
 of the GNU General Public License, incorporated herein by reference.
 """
 
 import struct, os
 from node import *
 from demandload import *
 demandload(globals(), "time bisect stat util re")
 
 class dirstate:
     def __init__(self, opener, ui, root):
         self.opener = opener
         self.root = root
         self.dirty = 0
         self.ui = ui
         self.map = None
         self.pl = None
         self.copies = {}
         self.ignorefunc = None
         self.blockignore = False
 
     def wjoin(self, f):
         return os.path.join(self.root, f)
 
     def getcwd(self):
         cwd = os.getcwd()
         if cwd == self.root: return ''
         return cwd[len(self.root) + 1:]
 
     def hgignore(self):
         '''return the contents of .hgignore as a list of patterns.
 
         trailing white space is dropped.
         the escape character is backslash.
         comments start with #.
         empty lines are skipped.
 
         lines can be of the following formats:
 
         syntax: regexp # defaults following lines to non-rooted regexps
         syntax: glob   # defaults following lines to non-rooted globs
         re:pattern     # non-rooted regular expression
         glob:pattern   # non-rooted glob
         pattern        # pattern of the current default type'''
         syntaxes = {'re': 'relre:', 'regexp': 'relre:', 'glob': 'relglob:'}
         def parselines(fp):
             for line in fp:
                 escape = False
                 for i in xrange(len(line)):
                     if escape: escape = False
                     elif line[i] == '\\': escape = True
                     elif line[i] == '#': break
                 line = line[:i].rstrip()
                 if line: yield line
         pats = []
         try:
             fp = open(self.wjoin('.hgignore'))
             syntax = 'relre:'
             for line in parselines(fp):
                 if line.startswith('syntax:'):
                     s = line[7:].strip()
                     try:
                         syntax = syntaxes[s]
                     except KeyError:
                         self.ui.warn("ignoring invalid syntax '%s'\n" % s)
                     continue
                 pat = syntax + line
                 for s in syntaxes.values():
                     if line.startswith(s):
                         pat = line
                         break
                 pats.append(pat)
         except IOError: pass
         return pats
 
     def ignore(self, fn):
         '''default match function used by dirstate and localrepository.
         this honours the .hgignore file, and nothing more.'''
         if self.blockignore:
             return False
         if not self.ignorefunc:
             ignore = self.hgignore()
             if ignore:
                 files, self.ignorefunc, anypats = util.matcher(self.root,
                                                                inc=ignore)
             else:
                 self.ignorefunc = util.never
         return self.ignorefunc(fn)
 
     def __del__(self):
         if self.dirty:
             self.write()
 
     def __getitem__(self, key):
         try:
             return self.map[key]
         except TypeError:
             self.read()
             return self[key]
 
     def __contains__(self, key):
         if not self.map: self.read()
         return key in self.map
 
     def parents(self):
         if not self.pl:
             self.read()
         return self.pl
 
     def markdirty(self):
         if not self.dirty:
             self.dirty = 1
 
     def setparents(self, p1, p2=nullid):
+        if not self.pl:
+            self.read()
         self.markdirty()
         self.pl = p1, p2
 
     def state(self, key):
         try:
             return self[key][0]
         except KeyError:
             return "?"
 
     def read(self):
         if self.map is not None: return self.map
 
         self.map = {}
         self.pl = [nullid, nullid]
         try:
             st = self.opener("dirstate").read()
             if not st: return
         except: return
 
         self.pl = [st[:20], st[20: 40]]
 
         pos = 40
         while pos < len(st):
             e = struct.unpack(">cllll", st[pos:pos+17])
             l = e[4]
             pos += 17
             f = st[pos:pos + l]
             if '\0' in f:
                 f, c = f.split('\0')
                 self.copies[f] = c
             self.map[f] = e[:4]
             pos += l
 
     def copy(self, source, dest):
         self.read()
         self.markdirty()
         self.copies[dest] = source
 
     def copied(self, file):
         return self.copies.get(file, None)
 
     def update(self, files, state, **kw):
         ''' current states:
         n  normal
         m  needs merging
         r  marked for removal
         a  marked for addition'''
 
         if not files: return
         self.read()
         self.markdirty()
         for f in files:
             if state == "r":
                 self.map[f] = ('r', 0, 0, 0)
             else:
                 s = os.lstat(os.path.join(self.root, f))
                 st_size = kw.get('st_size', s.st_size)
                 st_mtime = kw.get('st_mtime', s.st_mtime)
                 self.map[f] = (state, s.st_mode, st_size, st_mtime)
             if self.copies.has_key(f):
                 del self.copies[f]
 
     def forget(self, files):
         if not files: return
         self.read()
         self.markdirty()
         for f in files:
             try:
                 del self.map[f]
             except KeyError:
                 self.ui.warn("not in dirstate: %s!\n" % f)
                 pass
 
     def clear(self):
         self.map = {}
         self.markdirty()
 
     def write(self):
         st = self.opener("dirstate", "w")
         st.write("".join(self.pl))
         for f, e in self.map.items():
             c = self.copied(f)
             if c:
                 f = f + "\0" + c
             e = struct.pack(">cllll", e[0], e[1], e[2], e[3], len(f))
             st.write(e + f)
         self.dirty = 0
 
     def filterfiles(self, files):
         ret = {}
         unknown = []
 
         for x in files:
             if x is '.':
                 return self.map.copy()
             if x not in self.map:
                 unknown.append(x)
             else:
                 ret[x] = self.map[x]
 
         if not unknown:
             return ret
 
         b = self.map.keys()
         b.sort()
         blen = len(b)
 
         for x in unknown:
             bs = bisect.bisect(b, x)
             if bs != 0 and  b[bs-1] == x:
                 ret[x] = self.map[x]
                 continue
             while bs < blen:
                 s = b[bs]
                 if len(s) > len(x) and s.startswith(x) and s[len(x)] == '/':
                     ret[s] = self.map[s]
                 else:
                     break
                 bs += 1
         return ret
 
     def walk(self, files=None, match=util.always, dc=None):
         self.read()
 
         # walk all files by default
         if not files:
             files = [self.root]
             if not dc:
                 dc = self.map.copy()
         elif not dc:
             dc = self.filterfiles(files)
 
         def statmatch(file, stat):
             file = util.pconvert(file)
             if file not in dc and self.ignore(file):
                 return False
             return match(file)
 
         return self.walkhelper(files=files, statmatch=statmatch, dc=dc)
 
     # walk recursively through the directory tree, finding all files
     # matched by the statmatch function
     #
     # results are yielded in a tuple (src, filename), where src is one of:
     # 'f' the file was found in the directory tree
     # 'm' the file was only in the dirstate and not in the tree
     #
     # dc is an optional arg for the current dirstate.  dc is not modified
     # directly by this function, but might be modified by your statmatch call.
     #
     def walkhelper(self, files, statmatch, dc):
         def supported_type(f, st):
             if stat.S_ISREG(st.st_mode):
                 return True
             else:
                 kind = 'unknown'
                 if stat.S_ISCHR(st.st_mode): kind = 'character device'
                 elif stat.S_ISBLK(st.st_mode): kind = 'block device'
                 elif stat.S_ISFIFO(st.st_mode): kind = 'fifo'
                 elif stat.S_ISLNK(st.st_mode): kind = 'symbolic link'
                 elif stat.S_ISSOCK(st.st_mode): kind = 'socket'
                 elif stat.S_ISDIR(st.st_mode): kind = 'directory'
                 self.ui.warn('%s: unsupported file type (type is %s)\n' % (
                     util.pathto(self.getcwd(), f),
                     kind))
                 return False
 
         # recursion free walker, faster than os.walk.
         def findfiles(s):
             retfiles = []
             work = [s]
             while work:
                 top = work.pop()
                 names = os.listdir(top)
                 names.sort()
                 # nd is the top of the repository dir tree
                 nd = util.normpath(top[len(self.root) + 1:])
                 if nd == '.': nd = ''
                 for f in names:
                     np = os.path.join(nd, f)
                     if seen(np):
                         continue
                     p = os.path.join(top, f)
                     # don't trip over symlinks
                     st = os.lstat(p)
                     if stat.S_ISDIR(st.st_mode):
                         ds = os.path.join(nd, f +'/')
                         if statmatch(ds, st):
                             work.append(p)
                     elif supported_type(np, st):
                         if statmatch(np, st):
                             yield util.pconvert(np)
 
 
         known = {'.hg': 1}
         def seen(fn):
             if fn in known: return True
             known[fn] = 1
 
         # step one, find all files that match our criteria
         files.sort()
         for ff in util.unique(files):
             f = os.path.join(self.root, ff)
             try:
                 st = os.lstat(f)
             except OSError, inst:
                 if ff not in dc: self.ui.warn('%s: %s\n' % (
                     util.pathto(self.getcwd(), ff),
                     inst.strerror))
                 continue
             if stat.S_ISDIR(st.st_mode):
                 sorted = [ x for x in findfiles(f) ]
                 sorted.sort()
                 for fl in sorted:
                     yield 'f', fl
             else:
                 ff = util.normpath(ff)
                 if seen(ff):
                     continue
                 found = False
                 self.blockignore = True
                 if supported_type(ff, st) and statmatch(ff, st):
                     found = True
                 self.blockignore = False
                 if found:
                     yield 'f', ff
 
         # step two run through anything left in the dc hash and yield
         # if we haven't already seen it
         ks = dc.keys()
         ks.sort()
         for k in ks:
             if not seen(k) and (statmatch(k, None)):
                 yield 'm', k
 
     def changes(self, files=None, match=util.always):
         self.read()
         if not files:
             files = [self.root]
             dc = self.map.copy()
         else:
             dc = self.filterfiles(files)
         lookup, modified, added, unknown = [], [], [], []
         removed, deleted = [], []
 
         # statmatch function to eliminate entries from the dirstate copy
         # and put files into the appropriate array.  This gets passed
         # to the walking code
         def statmatch(fn, s):
             fn = util.pconvert(fn)
             def checkappend(l, fn):
                 if match is util.always or match(fn):
                     l.append(fn)
 
             if not s or stat.S_ISDIR(s.st_mode):
                 if self.ignore(fn): return False
                 return match(fn)
 
             c = dc.pop(fn, None)
             if c:
                 type, mode, size, time = c
                 # check the common case first
                 if type == 'n':
                     if size != s.st_size or (mode ^ s.st_mode) & 0100:
                         checkappend(modified, fn)
                     elif time != s.st_mtime:
                         checkappend(lookup, fn)
                 elif type == 'm':
                     checkappend(modified, fn)
                 elif type == 'a':
                     checkappend(added, fn)
                 elif type == 'r':
                     checkappend(unknown, fn)
             elif not self.ignore(fn) and match(fn):
                 unknown.append(fn)
             # return false because we've already handled all cases above.
             # there's no need for the walking code to process the file
             # any further.
             return False
 
         # because our statmatch always returns false, self.walk will only
         # return files in the dirstate map that are not present in the FS.
         # But, we still need to iterate through the results to force the
         # walk to complete
         for src, fn in self.walkhelper(files, statmatch, dc):
             pass
 
         # there may be patterns in the .hgignore file that prevent us
         # from examining entire directories in the dirstate map, so we
         # go back and explicitly examine any matching files we've
         # ignored
         unexamined = [fn for fn in dc.iterkeys()
                       if self.ignore(fn) and match(fn)]
 
         for src, fn in self.walkhelper(unexamined, statmatch, dc):
             pass
 
         # anything left in dc didn't exist in the filesystem
         for fn, c in dc.iteritems():
             if not match(fn): continue
             if c[0] == 'r':
                 removed.append(fn)
             else:
                 deleted.append(fn)
         return (lookup, modified, added, removed + deleted, unknown)