Fix linking of changeset revs when merging

mercurial/hg.py

@@ -1,574 +1,575 b''
 # hg.py - repository classes 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 sys, struct, sha, socket, os, time, base64, re, urllib2, binascii
 from mercurial import byterange
 from mercurial.transaction import *
 from mercurial.revlog import *
 
 def hex(node): return binascii.hexlify(node)
 def bin(node): return binascii.unhexlify(node)
 
 class filelog(revlog):
     def __init__(self, opener, path):
         s = self.encodepath(path)
         revlog.__init__(self, opener, os.path.join("data", s + "i"),
                         os.path.join("data", s))
 
     def encodepath(self, path):
         s = sha.sha(path).digest()
         s = base64.encodestring(s)[:-3]
         s = re.sub("\+", "%", s)
         s = re.sub("/", "_", s)
         return s
 
     def read(self, node):
         return self.revision(node)
     def add(self, text, transaction, link, p1=None, p2=None):
         return self.addrevision(text, transaction, link, p1, p2)
 
     def resolvedag(self, old, new, transaction, link):
         """resolve unmerged heads in our DAG"""
         if old == new: return None
         a = self.ancestor(old, new)
         if old == a: return new
         return self.merge3(old, new, a, transaction, link)
 
     def merge3(self, my, other, base, transaction, link):
         """perform a 3-way merge and append the result"""
         def temp(prefix, node):
             (fd, name) = tempfile.mkstemp(prefix)
             f = os.fdopen(fd, "w")
             f.write(self.revision(node))
             f.close()
             return name
 
         a = temp("local", my)
         b = temp("remote", other)
         c = temp("parent", base)
 
         cmd = os.environ["HGMERGE"]
         r = os.system("%s %s %s %s" % (cmd, a, b, c))
         if r:
             raise "Merge failed, implement rollback!"
 
         t = open(a).read()
         os.unlink(a)
         os.unlink(b)
         os.unlink(c)
         return self.addrevision(t, transaction, link, my, other)
 
     def merge(self, other, transaction, linkseq, link):
         """perform a merge and resolve resulting heads"""
         (o, n) = self.mergedag(other, transaction, linkseq)
         return self.resolvedag(o, n, transaction, link)
 
 class manifest(revlog):
     def __init__(self, opener):
         self.mapcache = None
         self.listcache = None
         self.addlist = None
         revlog.__init__(self, opener, "00manifest.i", "00manifest.d")
 
     def read(self, node):
         if self.mapcache and self.mapcache[0] == node:
             return self.mapcache[1]
         text = self.revision(node)
         map = {}
         self.listcache = text.splitlines(1)
         for l in self.listcache:
             (f, n) = l.split('\0')
             map[f] = bin(n[:40])
         self.mapcache = (node, map)
         return map
 
     def diff(self, a, b):
         # this is sneaky, as we're not actually using a and b
         if self.listcache:
             return mdiff.diff(self.listcache, self.addlist, 1)
         else:
             return mdiff.diff(a, b)
 
     def add(self, map, transaction, link, p1=None, p2=None):
         files = map.keys()
         files.sort()
 
         self.addlist = ["%s\000%s\n" % (f, hex(map[f])) for f in files]
         text = "".join(self.addlist)
 
         n = self.addrevision(text, transaction, link, p1, p2)
         self.mapcache = (n, map)
         self.listcache = self.addlist
 
         return n
 
 class changelog(revlog):
     def __init__(self, opener):
         revlog.__init__(self, opener, "00changelog.i", "00changelog.d")
 
     def extract(self, text):
         last = text.index("\n\n")
         desc = text[last + 2:]
         l = text[:last].splitlines()
         manifest = bin(l[0])
         user = l[1]
         date = l[2]
         files = l[3:]
         return (manifest, user, date, files, desc)
 
     def read(self, node):
         return self.extract(self.revision(node))
 
     def add(self, manifest, list, desc, transaction, p1=None, p2=None):
         try: user = os.environ["HGUSER"]
         except: user = os.environ["LOGNAME"] + '@' + socket.getfqdn()
         date = "%d %d" % (time.time(), time.timezone)
         list.sort()
         l = [hex(manifest), user, date] + list + ["", desc]
         text = "\n".join(l)
         return self.addrevision(text, transaction, self.count(), p1, p2)
 
     def merge3(self, my, other, base):
         pass
 
 class dircache:
     def __init__(self, opener):
         self.opener = opener
         self.dirty = 0
         self.map = None
     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 read(self):
         if self.map is not None: return self.map
 
         self.map = {}
         try:
             st = self.opener("dircache").read()
         except: return
 
         pos = 0
         while pos < len(st):
             e = struct.unpack(">llll", st[pos:pos+16])
             l = e[3]
             pos += 16
             f = st[pos:pos + l]
             self.map[f] = e[:3]
             pos += l
         
     def update(self, files):
         if not files: return
         self.read()
         self.dirty = 1
         for f in files:
             try:
                 s = os.stat(f)
                 self.map[f] = (s.st_mode, s.st_size, s.st_mtime)
             except IOError:
                 self.remove(f)
 
     def taint(self, files):
         if not files: return
         self.read()
         self.dirty = 1
         for f in files:
             self.map[f] = (0, -1, 0)
 
     def remove(self, files):
         if not files: return
         self.read()
         self.dirty = 1
         for f in files:
             try: del self[f]
             except: pass
 
     def clear(self):
         self.map = {}
         self.dirty = 1
 
     def write(self):
         st = self.opener("dircache", "w")
         for f, e in self.map.items():
             e = struct.pack(">llll", e[0], e[1], e[2], len(f))
             st.write(e + f)
         self.dirty = 0
 
     def copy(self):
         self.read()
         return self.map.copy()
 
 # used to avoid circular references so destructors work
 def opener(base):
     p = base
     def o(path, mode="r"):
         f = os.path.join(p, path)
         if p[:7] == "http://":
             return httprangereader(f)
 
         if mode != "r" and os.path.isfile(f):
             s = os.stat(f)
             if s.st_nlink > 1:
                 file(f + ".tmp", "w").write(file(f).read())
                 os.rename(f+".tmp", f)
 
         return file(f, mode)
 
     return o
 
 class repository:
     def __init__(self, ui, path=None, create=0):
         self.remote = 0
         if path and path[:7] == "http://":
             self.remote = 1
             self.path = path
         else:
             if not path:
                 p = os.getcwd()
                 while not os.path.isdir(os.path.join(p, ".hg")):
                     p = os.path.dirname(p)
                     if p == "/": raise "No repo found"
                 path = p
             self.path = os.path.join(path, ".hg")
 
         self.root = path
         self.ui = ui
 
         if create:
             os.mkdir(self.path)  
             os.mkdir(self.join("data"))
 
         self.opener = opener(self.path)
         self.manifest = manifest(self.opener)
         self.changelog = changelog(self.opener)
         self.ignorelist = None
 
         if not self.remote:
             self.dircache = dircache(self.opener)
             try:
                 self.current = bin(self.opener("current").read())
             except IOError:
                 self.current = None
 
     def setcurrent(self, node):
         self.current = node
         self.opener("current", "w").write(hex(node))
       
     def ignore(self, f):
         if self.ignorelist is None:
             self.ignorelist = []
             try:
                 l = open(os.path.join(self.root, ".hgignore")).readlines()
                 for pat in l:
                     if pat != "\n":
                         self.ignorelist.append(re.compile(pat[:-1]))
             except IOError: pass
         for pat in self.ignorelist:
             if pat.search(f): return True
         return False
 
     def join(self, f):
         return os.path.join(self.path, f)
 
     def file(self, f):
         return filelog(self.opener, f)
 
     def transaction(self):
         return transaction(self.opener, self.join("journal"))
 
     def merge(self, other):
         tr = self.transaction()
         changed = {}
         new = {}
-        nextrev = seqrev = self.changelog.count()
+        seqrev = self.changelog.count()
+        # some magic to allow fiddling in nested scope
+        nextrev = [seqrev]
 
         # helpers for back-linking file revisions to local changeset
         # revisions so we can immediately get to changeset from annotate
         def accumulate(text):
-            n = nextrev
             # track which files are added in which changeset and the
             # corresponding _local_ changeset revision
             files = self.changelog.extract(text)[3]
             for f in files:
-                changed.setdefault(f, []).append(n)
-            n += 1
+                changed.setdefault(f, []).append(nextrev[0])
+            nextrev[0] += 1
 
         def seq(start):
             while 1:
                 yield start
                 start += 1
 
         def lseq(l):
             for r in l:
                 yield r
 
         # begin the import/merge of changesets
         self.ui.status("merging new changesets\n")
         (co, cn) = self.changelog.mergedag(other.changelog, tr,
                                            seq(seqrev), accumulate)
         resolverev = self.changelog.count()
 
         # is there anything to do?
         if co == cn:
             tr.close()
             return
         
         # do we need to resolve?
         simple = (co == self.changelog.ancestor(co, cn))
 
         # merge all files changed by the changesets,
         # keeping track of the new tips
         changelist = changed.keys()
         changelist.sort()
         for f in changelist:
             sys.stdout.write(".")
             sys.stdout.flush()
             r = self.file(f)
             node = r.merge(other.file(f), tr, lseq(changed[f]), resolverev)
             if node:
                 new[f] = node
         sys.stdout.write("\n")
 
         # begin the merge of the manifest
         self.ui.status("merging manifests\n")
         (mm, mo) = self.manifest.mergedag(other.manifest, tr, seq(seqrev))
 
         # For simple merges, we don't need to resolve manifests or changesets
         if simple:
             tr.close()
             return
 
         ma = self.manifest.ancestor(mm, mo)
 
         # resolve the manifest to point to all the merged files
         self.ui.status("resolving manifests\n")
         mmap = self.manifest.read(mm) # mine
         omap = self.manifest.read(mo) # other
         amap = self.manifest.read(ma) # ancestor
         nmap = {}
 
         for f, mid in mmap.iteritems():
             if f in omap:
                 if mid != omap[f]: 
                     nmap[f] = new.get(f, mid) # use merged version
                 else:
                     nmap[f] = new.get(f, mid) # they're the same
                 del omap[f]
             elif f in amap:
                 if mid != amap[f]: 
                     pass # we should prompt here
                 else:
                     pass # other deleted it
             else:
                 nmap[f] = new.get(f, mid) # we created it
                 
         del mmap
 
         for f, oid in omap.iteritems():
             if f in amap:
                 if oid != amap[f]:
                     pass # this is the nasty case, we should prompt
                 else:
                     pass # probably safe
             else:
                 nmap[f] = new.get(f, oid) # remote created it
 
         del omap
         del amap
 
         node = self.manifest.add(nmap, tr, resolverev, mm, mo)
 
         # Now all files and manifests are merged, we add the changed files
         # and manifest id to the changelog
         self.ui.status("committing merge changeset\n")
         new = new.keys()
         new.sort()
         if co == cn: cn = -1
 
         edittext = "\n"+"".join(["HG: changed %s\n" % f for f in new])
         edittext = self.ui.edit(edittext)
         n = self.changelog.add(node, new, edittext, tr, co, cn)
 
         tr.close()
 
     def commit(self, update = None, text = ""):
         tr = self.transaction()
         
         try:
             remove = [ l[:-1] for l in self.opener("to-remove") ]
             os.unlink(self.join("to-remove"))
 
         except IOError:
             remove = []
 
         if update == None:
             update = self.diffdir(self.root)[0]
 
         # check in files
         new = {}
         linkrev = self.changelog.count()
         for f in update:
             try:
                 t = file(f).read()
             except IOError:
                 remove.append(f)
                 continue
             r = self.file(f)
             new[f] = r.add(t, tr, linkrev)
 
         # update manifest
         mmap = self.manifest.read(self.manifest.tip())
         mmap.update(new)
         for f in remove:
             del mmap[f]
         mnode = self.manifest.add(mmap, tr, linkrev)
 
         # add changeset
         new = new.keys()
         new.sort()
 
         edittext = text + "\n"+"".join(["HG: changed %s\n" % f for f in new])
         edittext = self.ui.edit(edittext)
 
         n = self.changelog.add(mnode, new, edittext, tr)
         tr.close()
 
         self.setcurrent(n)
         self.dircache.update(new)
         self.dircache.remove(remove)
 
     def checkdir(self, path):
         d = os.path.dirname(path)
         if not d: return
         if not os.path.isdir(d):
             self.checkdir(d)
             os.mkdir(d)
 
     def checkout(self, node):
         # checkout is really dumb at the moment
         # it ought to basically merge
         change = self.changelog.read(node)
         mmap = self.manifest.read(change[0])
 
         l = mmap.keys()
         l.sort()
         stats = []
         for f in l:
             r = self.file(f)
             t = r.revision(mmap[f])
             try:
                 file(f, "w").write(t)
             except:
                 self.checkdir(f)
                 file(f, "w").write(t)
 
         self.setcurrent(node)
         self.dircache.clear()
         self.dircache.update(l)
 
     def diffdir(self, path):
         dc = self.dircache.copy()
         changed = []
         mf = {}
         added = []
 
         if self.current:
             change = self.changelog.read(self.current)
             mf = self.manifest.read(change[0])
 
         for dir, subdirs, files in os.walk(self.root):
             d = dir[len(self.root)+1:]
             if ".hg" in subdirs: subdirs.remove(".hg")
             
             for f in files:
                 fn = os.path.join(d, f)
                 try: s = os.stat(fn)
                 except: continue
                 if fn in dc:
                     c = dc[fn]
                     del dc[fn]
                     if c[1] != s.st_size:
                         changed.append(fn)
                     elif c[0] != s.st_mode or c[2] != s.st_mtime:
                         t1 = file(fn).read()
                         t2 = self.file(fn).revision(mf[fn])
                         if t1 != t2:
                             changed.append(fn)
                 else:
                     if self.ignore(fn): continue
                     added.append(fn)
 
         deleted = dc.keys()
         deleted.sort()
 
         return (changed, added, deleted)
 
     def add(self, list):
         self.dircache.taint(list)
 
     def remove(self, list):
         dl = self.opener("to-remove", "a")
         for f in list:
             dl.write(f + "\n")
 
 class ui:
     def __init__(self, verbose=False, debug=False):
         self.verbose = verbose
     def write(self, *args):
         for a in args:
             sys.stdout.write(str(a))
     def prompt(self, msg, pat):
         while 1:
             sys.stdout.write(msg)
             r = sys.stdin.readline()[:-1]
             if re.match(pat, r):
                 return r
     def status(self, *msg):
         self.write(*msg)
     def warn(self, msg):
         self.write(*msg)
     def note(self, msg):
         if self.verbose: self.write(*msg)
     def debug(self, msg):
         if self.debug: self.write(*msg)
     def edit(self, text):
         (fd, name) = tempfile.mkstemp("hg")
         f = os.fdopen(fd, "w")
         f.write(text)
         f.close()
 
         editor = os.environ.get("EDITOR", "vi")
         r = os.system("%s %s" % (editor, name))
         if r:
             raise "Edit failed!"
 
         t = open(name).read()
         t = re.sub("(?m)^HG:.*\n", "", t)
 
         return t
 
     
 class httprangereader:
     def __init__(self, url):
         self.url = url
         self.pos = 0
     def seek(self, pos):
         self.pos = pos
     def read(self, bytes=None):
         opener = urllib2.build_opener(byterange.HTTPRangeHandler())
         urllib2.install_opener(opener)
         req = urllib2.Request(self.url)
         end = ''
         if bytes: end = self.pos + bytes
         req.add_header('Range', 'bytes=%d-%s' % (self.pos, end))
         f = urllib2.urlopen(req)
         return f.read()