Code

Make git-p4 work with packed refs (don't use os.path.exists to check for the
[git.git] / contrib / fast-import / git-p4
index 7d4273963725464776256b1ecda8fab97a25a5bc..e8a5c1fa316f2ac5be4fa32b145d233db31252a5 100755 (executable)
@@ -7,6 +7,9 @@
 #            2007 Trolltech ASA
 # License: MIT <http://www.opensource.org/licenses/mit-license.php>
 #
+# TODO: * Consider making --with-origin the default, assuming that the git
+#         protocol is always more efficient. (needs manual testing first :)
+#
 
 import optparse, sys, os, marshal, popen2, subprocess, shelve
 import tempfile, getopt, sha, os.path, time, platform
@@ -28,7 +31,11 @@ def p4CmdList(cmd):
             result.append(entry)
     except EOFError:
         pass
-    pipe.close()
+    exitCode = pipe.close()
+    if exitCode != None:
+        entry = {}
+        entry["p4ExitCode"] = exitCode
+        result.append(entry)
 
     return result
 
@@ -43,6 +50,8 @@ def p4Where(depotPath):
     if not depotPath.endswith("/"):
         depotPath += "/"
     output = p4Cmd("where %s..." % depotPath)
+    if output["code"] == "error":
+        return ""
     clientPath = ""
     if "path" in output:
         clientPath = output.get("path")
@@ -127,6 +136,57 @@ class P4Debug(Command):
             print output
         return True
 
+class P4RollBack(Command):
+    def __init__(self):
+        Command.__init__(self)
+        self.options = [
+            optparse.make_option("--verbose", dest="verbose", action="store_true"),
+            optparse.make_option("--local", dest="rollbackLocalBranches", action="store_true")
+        ]
+        self.description = "A tool to debug the multi-branch import. Don't use :)"
+        self.verbose = False
+        self.rollbackLocalBranches = False
+
+    def run(self, args):
+        if len(args) != 1:
+            return False
+        maxChange = int(args[0])
+
+        if "p4ExitCode" in p4Cmd("changes -m 1"):
+            die("Problems executing p4");
+
+        if self.rollbackLocalBranches:
+            refPrefix = "refs/heads/"
+            lines = mypopen("git rev-parse --symbolic --branches").readlines()
+        else:
+            refPrefix = "refs/remotes/"
+            lines = mypopen("git rev-parse --symbolic --remotes").readlines()
+
+        for line in lines:
+            if self.rollbackLocalBranches or (line.startswith("p4/") and line != "p4/HEAD\n"):
+                ref = refPrefix + line[:-1]
+                log = extractLogMessageFromGitCommit(ref)
+                depotPath, change = extractDepotPathAndChangeFromGitLog(log)
+                changed = False
+
+                if len(p4Cmd("changes -m 1 %s...@%s" % (depotPath, maxChange))) == 0:
+                    print "Branch %s did not exist at change %s, deleting." % (ref, maxChange)
+                    system("git update-ref -d %s `git rev-parse %s`" % (ref, ref))
+                    continue
+
+                while len(change) > 0 and int(change) > maxChange:
+                    changed = True
+                    if self.verbose:
+                        print "%s is at %s ; rewinding towards %s" % (ref, change, maxChange)
+                    system("git update-ref %s \"%s^\"" % (ref, ref))
+                    log = extractLogMessageFromGitCommit(ref)
+                    depotPath, change = extractDepotPathAndChangeFromGitLog(log)
+
+                if changed:
+                    print "%s rewound to %s" % (ref, change)
+
+        return True
+
 class P4Submit(Command):
     def __init__(self):
         Command.__init__(self)
@@ -137,6 +197,7 @@ class P4Submit(Command):
                 optparse.make_option("--log-substitutions", dest="substFile"),
                 optparse.make_option("--noninteractive", action="store_false"),
                 optparse.make_option("--dry-run", action="store_true"),
+                optparse.make_option("--direct", dest="directSubmit", action="store_true"),
         ]
         self.description = "Submit changes from git to the perforce depot."
         self.usage += " [name of git branch to submit into perforce depot]"
@@ -147,6 +208,7 @@ class P4Submit(Command):
         self.substFile = ""
         self.firstTime = True
         self.origin = ""
+        self.directSubmit = False
 
         self.logSubstitutions = {}
         self.logSubstitutions["<enter description here>"] = "%log%"
@@ -161,9 +223,12 @@ class P4Submit(Command):
             die("Cannot start sync. Previous sync config found at %s\nIf you want to start submitting again from scratch maybe you want to call git-p4 submit --reset" % self.configFile)
 
         commits = []
-        for line in mypopen("git rev-list --no-merges %s..%s" % (self.origin, self.master)).readlines():
-            commits.append(line[:-1])
-        commits.reverse()
+        if self.directSubmit:
+            commits.append("0")
+        else:
+            for line in mypopen("git rev-list --no-merges %s..%s" % (self.origin, self.master)).readlines():
+                commits.append(line[:-1])
+            commits.reverse()
 
         self.config["commits"] = commits
 
@@ -191,8 +256,12 @@ class P4Submit(Command):
         return result
 
     def apply(self, id):
-        print "Applying %s" % (mypopen("git log --max-count=1 --pretty=oneline %s" % id).read())
-        diff = mypopen("git diff-tree -r --name-status \"%s^\" \"%s\"" % (id, id)).readlines()
+        if self.directSubmit:
+            print "Applying local change in working directory/index"
+            diff = self.diffStatus
+        else:
+            print "Applying %s" % (mypopen("git log --max-count=1 --pretty=oneline %s" % id).read())
+            diff = mypopen("git diff-tree -r --name-status \"%s^\" \"%s\"" % (id, id)).readlines()
         filesToAdd = set()
         filesToDelete = set()
         editedFiles = set()
@@ -213,10 +282,15 @@ class P4Submit(Command):
             else:
                 die("unknown modifier %s for %s" % (modifier, path))
 
-        diffcmd = "git diff-tree -p --diff-filter=ACMRTUXB \"%s^\" \"%s\"" % (id, id)
-        patchcmd = diffcmd + " | patch -p1"
+        if self.directSubmit:
+            diffcmd = "cat \"%s\"" % self.diffFile
+        else:
+            diffcmd = "git format-patch -k --stdout \"%s^\"..\"%s\"" % (id, id)
+        patchcmd = diffcmd + " | git apply "
+        tryPatchCmd = patchcmd + "--check -"
+        applyPatchCmd = patchcmd + "--check --apply -"
 
-        if os.system(patchcmd + " --dry-run --silent") != 0:
+        if os.system(tryPatchCmd) != 0:
             print "Unfortunately applying the change failed!"
             print "What do you want to do?"
             response = "x"
@@ -226,7 +300,7 @@ class P4Submit(Command):
                 print "Skipping! Good luck with the next patches..."
                 return
             elif response == "a":
-                os.system(patchcmd)
+                os.system(applyPatchCmd)
                 if len(filesToAdd) > 0:
                     print "You may also want to call p4 add on the following files:"
                     print " ".join(filesToAdd)
@@ -239,7 +313,7 @@ class P4Submit(Command):
                 print "Patch saved to patch.txt in %s !" % self.clientPath
                 die("Please resolve and submit the conflict manually and continue afterwards with git-p4 submit --continue")
 
-        system(patchcmd)
+        system(applyPatchCmd)
 
         for f in filesToAdd:
             system("p4 add %s" % f)
@@ -247,9 +321,11 @@ class P4Submit(Command):
             system("p4 revert %s" % f)
             system("p4 delete %s" % f)
 
-        logMessage = extractLogMessageFromGitCommit(id)
-        logMessage = logMessage.replace("\n", "\n\t")
-        logMessage = logMessage[:-1]
+        logMessage = ""
+        if not self.directSubmit:
+            logMessage = extractLogMessageFromGitCommit(id)
+            logMessage = logMessage.replace("\n", "\n\t")
+            logMessage = logMessage[:-1]
 
         template = mypopen("p4 change -o").read()
 
@@ -298,9 +374,17 @@ class P4Submit(Command):
                    print submitTemplate
                    raw_input("Press return to continue...")
                else:
-                    pipe = os.popen("p4 submit -i", "wb")
-                    pipe.write(submitTemplate)
-                    pipe.close()
+                   if self.directSubmit:
+                       print "Submitting to git first"
+                       os.chdir(self.oldWorkingDirectory)
+                       pipe = os.popen("git commit -a -F -", "wb")
+                       pipe.write(submitTemplate)
+                       pipe.close()
+                       os.chdir(self.clientPath)
+
+                   pipe = os.popen("p4 submit -i", "wb")
+                   pipe.write(submitTemplate)
+                   pipe.close()
             elif response == "s":
                 for f in editedFiles:
                     system("p4 revert \"%s\"" % f);
@@ -328,7 +412,7 @@ class P4Submit(Command):
 
         if len(args) == 0:
             self.master = currentGitBranch()
-            if len(self.master) == 0 or not os.path.exists("%s/refs/heads/%s" % (gitdir, self.master)):
+            if len(self.master) == 0 or not gitBranchExists("refs/heads/%s" % self.master):
                 die("Detecting current git branch failed!")
         elif len(args) == 1:
             self.master = args[0]
@@ -352,7 +436,19 @@ class P4Submit(Command):
             sys.exit(128)
 
         print "Perforce checkout for depot path %s located at %s" % (depotPath, self.clientPath)
-        oldWorkingDirectory = os.getcwd()
+        self.oldWorkingDirectory = os.getcwd()
+
+        if self.directSubmit:
+            self.diffStatus = mypopen("git diff -r --name-status HEAD").readlines()
+            if len(self.diffStatus) == 0:
+                print "No changes in working directory to submit."
+                return True
+            patch = mypopen("git diff -p --binary --diff-filter=ACMRTUXB HEAD").read()
+            self.diffFile = gitdir + "/p4-git-diff"
+            f = open(self.diffFile, "wb")
+            f.write(patch)
+            f.close();
+
         os.chdir(self.clientPath)
         response = raw_input("Do you want to sync %s with p4 sync? [y]es/[n]o " % self.clientPath)
         if response == "y" or response == "yes":
@@ -392,14 +488,17 @@ class P4Submit(Command):
 
         self.config.close()
 
+        if self.directSubmit:
+            os.remove(self.diffFile)
+
         if len(commits) == 0:
             if self.firstTime:
                 print "No changes found to apply between %s and current HEAD" % self.origin
             else:
                 print "All changes applied!"
+                os.chdir(self.oldWorkingDirectory)
                 response = raw_input("Do you want to sync from Perforce now using git-p4 rebase? [y]es/[n]o ")
                 if response == "y" or response == "yes":
-                    os.chdir(oldWorkingDirectory)
                     rebase = P4Rebase()
                     rebase.run([])
             os.remove(self.configFile)
@@ -416,7 +515,9 @@ class P4Sync(Command):
                 optparse.make_option("--silent", dest="silent", action="store_true"),
                 optparse.make_option("--detect-labels", dest="detectLabels", action="store_true"),
                 optparse.make_option("--with-origin", dest="syncWithOrigin", action="store_true"),
-                optparse.make_option("--verbose", dest="verbose", action="store_true")
+                optparse.make_option("--verbose", dest="verbose", action="store_true"),
+                optparse.make_option("--import-local", dest="importIntoRemotes", action="store_false"),
+                optparse.make_option("--max-changes", dest="maxChanges")
         ]
         self.description = """Imports from Perforce into a git repository.\n
     example:
@@ -437,6 +538,9 @@ class P4Sync(Command):
         self.changesFile = ""
         self.syncWithOrigin = False
         self.verbose = False
+        self.importIntoRemotes = True
+        self.maxChanges = ""
+        self.isWindows = (platform.system() == "Windows")
 
     def p4File(self, depotPath):
         return os.popen("p4 print -q \"%s\"" % depotPath, "rb").read()
@@ -461,15 +565,32 @@ class P4Sync(Command):
             fnum = fnum + 1
         return files
 
-    def branchesForCommit(self, files):
-        branches = Set()
+    def splitFilesIntoBranches(self, commit):
+        branches = {}
 
-        for file in files:
-            path = file["path"][len(self.depotPath):]
+        fnum = 0
+        while commit.has_key("depotFile%s" % fnum):
+            path =  commit["depotFile%s" % fnum]
+            if not path.startswith(self.depotPath):
+    #            if not self.silent:
+    #                print "\nchanged files: ignoring path %s outside of %s in change %s" % (path, self.depotPath, change)
+                fnum = fnum + 1
+                continue
+
+            file = {}
+            file["path"] = path
+            file["rev"] = commit["rev%s" % fnum]
+            file["action"] = commit["action%s" % fnum]
+            file["type"] = commit["type%s" % fnum]
+            fnum = fnum + 1
+
+            relPath = path[len(self.depotPath):]
 
             for branch in self.knownBranches.keys():
-                if path.startswith(branch):
-                    branches.add(branch)
+                if relPath.startswith(branch + "/"): # add a trailing slash so that a commit into qt/4.2foo doesn't end up in qt/4.2
+                    if branch not in branches:
+                        branches[branch] = []
+                    branches[branch].append(file)
 
         return branches
 
@@ -484,6 +605,8 @@ class P4Sync(Command):
     #    gitStream.write("mark :%s\n" % details["change"])
         self.committedChanges.add(int(details["change"]))
         committer = ""
+        if author not in self.users:
+            self.getUserMapFromPerforceServer()
         if author in self.users:
             committer = "%s %s %s" % (self.users[author], epoch, self.tz)
         else:
@@ -525,6 +648,9 @@ class P4Sync(Command):
 
                 data = self.p4File(depotPath)
 
+                if self.isWindows and file["type"].endswith("text"):
+                    data = data.replace("\r\n", "\n")
+
                 self.gitStream.write("M %s inline %s\n" % (mode, relPath))
                 self.gitStream.write("data %s\n" % len(data))
                 self.gitStream.write(data)
@@ -534,12 +660,12 @@ class P4Sync(Command):
 
         change = int(details["change"])
 
-        self.lastChange = change
-
-        if change in self.labels:
+        if self.labels.has_key(change):
             label = self.labels[change]
             labelDetails = label[0]
             labelRevisions = label[1]
+            if self.verbose:
+                print "Change %s is labelled %s" % (change, labelDetails)
 
             files = p4CmdList("files %s...@%s" % (branchPrefix, change))
 
@@ -574,17 +700,9 @@ class P4Sync(Command):
                 if not self.silent:
                     print "Tag %s does not match with change %s: file count is different." % (labelDetails["label"], change)
 
-    def extractFilesInCommitToBranch(self, files, branchPrefix):
-        newFiles = []
-
-        for file in files:
-            path = file["path"]
-            if path.startswith(branchPrefix):
-                newFiles.append(file)
-
-        return newFiles
-
-    def getUserMap(self):
+    def getUserMapFromPerforceServer(self):
+        if self.userMapFromPerforceServer:
+            return
         self.users = {}
 
         for output in p4CmdList("users"):
@@ -592,6 +710,25 @@ class P4Sync(Command):
                 continue
             self.users[output["User"]] = output["FullName"] + " <" + output["Email"] + ">"
 
+        cache = open(gitdir + "/p4-usercache.txt", "wb")
+        for user in self.users.keys():
+            cache.write("%s\t%s\n" % (user, self.users[user]))
+        cache.close();
+        self.userMapFromPerforceServer = True
+
+    def loadUserMapFromCache(self):
+        self.users = {}
+        self.userMapFromPerforceServer = False
+        try:
+            cache = open(gitdir + "/p4-usercache.txt", "rb")
+            lines = cache.readlines()
+            cache.close()
+            for line in lines:
+                entry = line[:-1].split("\t")
+                self.users[entry[0]] = entry[1]
+        except IOError:
+            self.getUserMapFromPerforceServer()
+
     def getLabels(self):
         self.labels = {}
 
@@ -603,7 +740,9 @@ class P4Sync(Command):
             label = output["label"]
             revisions = {}
             newestChange = 0
-            for file in p4CmdList("files //...@%s" % label):
+            if self.verbose:
+                print "Querying files for label %s" % label
+            for file in p4CmdList("files %s...@%s" % (self.depotPath, label)):
                 revisions[file["depotFile"]] = file["rev"]
                 change = int(file["change"])
                 if change > newestChange:
@@ -611,9 +750,11 @@ class P4Sync(Command):
 
             self.labels[newestChange] = [output, revisions]
 
+        if self.verbose:
+            print "Label changes: %s" % self.labels.keys()
+
     def getBranchMapping(self):
-        # map from branch depot path to parent branch
-        self.knownBranches = {}
+        self.projectName = self.depotPath[self.depotPath[:-1].rfind("/") + 1:]
 
         for info in p4CmdList("branches"):
             details = p4Cmd("branch -o %s" % info["branch"])
@@ -629,54 +770,133 @@ class P4Sync(Command):
                 if source.startswith(self.depotPath) and destination.startswith(self.depotPath):
                     source = source[len(self.depotPath):-4]
                     destination = destination[len(self.depotPath):-4]
-                    self.knownBranches[destination] = source
-                    self.knownBranches[source] = source
+                    if destination not in self.knownBranches:
+                        self.knownBranches[destination] = source
+                    if source not in self.knownBranches:
+                        self.knownBranches[source] = source
+
+    def listExistingP4GitBranches(self):
+        self.p4BranchesInGit = []
+
+        cmdline = "git rev-parse --symbolic "
+        if self.importIntoRemotes:
+            cmdline += " --remotes"
+        else:
+            cmdline += " --branches"
+
+        for line in mypopen(cmdline).readlines():
+            if self.importIntoRemotes and ((not line.startswith("p4/")) or line == "p4/HEAD\n"):
+                continue
+            if self.importIntoRemotes:
+                # strip off p4
+                branch = line[3:-1]
+            else:
+                branch = line[:-1]
+            self.p4BranchesInGit.append(branch)
+            self.initialParents[self.refPrefix + branch] = parseRevision(line[:-1])
+
+    def createOrUpdateBranchesFromOrigin(self):
+        if not self.silent:
+            print "Creating/updating branch(es) in %s based on origin branch(es)" % self.refPrefix
+
+        for line in mypopen("git rev-parse --symbolic --remotes"):
+            if (not line.startswith("origin/")) or line.endswith("HEAD\n"):
+                continue
+
+            headName = line[len("origin/"):-1]
+            remoteHead = self.refPrefix + headName
+            originHead = "origin/" + headName
+
+            [originPreviousDepotPath, originP4Change] = extractDepotPathAndChangeFromGitLog(extractLogMessageFromGitCommit(originHead))
+            if len(originPreviousDepotPath) == 0 or len(originP4Change) == 0:
+                continue
+
+            update = False
+            if not gitBranchExists(remoteHead):
+                if self.verbose:
+                    print "creating %s" % remoteHead
+                update = True
+            else:
+                [p4PreviousDepotPath, p4Change] = extractDepotPathAndChangeFromGitLog(extractLogMessageFromGitCommit(remoteHead))
+                if len(p4Change) > 0:
+                    if originPreviousDepotPath == p4PreviousDepotPath:
+                        originP4Change = int(originP4Change)
+                        p4Change = int(p4Change)
+                        if originP4Change > p4Change:
+                            print "%s (%s) is newer than %s (%s). Updating p4 branch from origin." % (originHead, originP4Change, remoteHead, p4Change)
+                            update = True
+                    else:
+                        print "Ignoring: %s was imported from %s while %s was imported from %s" % (originHead, originPreviousDepotPath, remoteHead, p4PreviousDepotPath)
+
+            if update:
+                system("git update-ref %s %s" % (remoteHead, originHead))
 
     def run(self, args):
         self.depotPath = ""
         self.changeRange = ""
         self.initialParent = ""
         self.previousDepotPath = ""
+        # map from branch depot path to parent branch
+        self.knownBranches = {}
+        self.initialParents = {}
+
+        if self.importIntoRemotes:
+            self.refPrefix = "refs/remotes/p4/"
+        else:
+            self.refPrefix = "refs/heads/"
 
-        if self.syncWithOrigin and gitBranchExists("origin") and gitBranchExists("refs/remotes/p4/master"):
+        if self.syncWithOrigin:
             print "Syncing with origin first as requested by calling git fetch origin"
             system("git fetch origin")
-            [originPreviousDepotPath, originP4Change] = extractDepotPathAndChangeFromGitLog(extractLogMessageFromGitCommit("origin"))
-            [p4PreviousDepotPath, p4Change] = extractDepotPathAndChangeFromGitLog(extractLogMessageFromGitCommit("p4"))
-            if len(originPreviousDepotPath) > 0 and len(originP4Change) > 0 and len(p4Change) > 0:
-                if originPreviousDepotPath == p4PreviousDepotPath:
-                    originP4Change = int(originP4Change)
-                    p4Change = int(p4Change)
-                    if originP4Change > p4Change:
-                        print "origin (%s) is newer than p4 (%s). Updating p4 branch from origin." % (originP4Change, p4Change)
-                        system("git update-ref refs/remotes/p4/master origin");
-                else:
-                    print "Cannot sync with origin. It was imported from %s while remotes/p4 was imported from %s" % (originPreviousDepotPath, p4PreviousDepotPath)
+
+        createP4HeadRef = False;
 
         if len(self.branch) == 0:
-            self.branch = "refs/remotes/p4/master"
-            if gitBranchExists("refs/heads/p4"):
+            self.branch = self.refPrefix + "master"
+            if gitBranchExists("refs/heads/p4") and self.importIntoRemotes:
                 system("git update-ref %s refs/heads/p4" % self.branch)
                 system("git branch -D p4");
-            if not gitBranchExists("refs/remotes/p4/HEAD"):
-                system("git symbolic-ref refs/remotes/p4/HEAD %s" % self.branch)
+            # create it /after/ importing, when master exists
+            if not gitBranchExists(self.refPrefix + "HEAD") and self.importIntoRemotes:
+                createP4HeadRef = True
 
         if len(args) == 0:
-            if not gitBranchExists(self.branch) and gitBranchExists("origin"):
+            self.createOrUpdateBranchesFromOrigin()
+            self.listExistingP4GitBranches()
+
+            if len(self.p4BranchesInGit) > 1:
                 if not self.silent:
-                    print "Creating %s branch in git repository based on origin" % self.branch
-                branch = self.branch
-                if not branch.startswith("refs"):
-                    branch = "refs/heads/" + branch
-                system("git update-ref %s origin" % branch)
-
-            [self.previousDepotPath, p4Change] = extractDepotPathAndChangeFromGitLog(extractLogMessageFromGitCommit(self.branch))
-            if len(self.previousDepotPath) > 0 and len(p4Change) > 0:
-                p4Change = int(p4Change) + 1
+                    print "Importing from/into multiple branches"
+                self.detectBranches = True
+
+            if self.verbose:
+                print "branches: %s" % self.p4BranchesInGit
+
+            p4Change = 0
+            for branch in self.p4BranchesInGit:
+                depotPath, change = extractDepotPathAndChangeFromGitLog(extractLogMessageFromGitCommit(self.refPrefix + branch))
+
+                if self.verbose:
+                    print "path %s change %s" % (depotPath, change)
+
+                if len(depotPath) > 0 and len(change) > 0:
+                    change = int(change) + 1
+                    p4Change = max(p4Change, change)
+
+                    if len(self.previousDepotPath) == 0:
+                        self.previousDepotPath = depotPath
+                    else:
+                        i = 0
+                        l = min(len(self.previousDepotPath), len(depotPath))
+                        while i < l and self.previousDepotPath[i] == depotPath[i]:
+                            i = i + 1
+                        self.previousDepotPath = self.previousDepotPath[:i]
+
+            if p4Change > 0:
                 self.depotPath = self.previousDepotPath
                 self.changeRange = "@%s,#head" % p4Change
                 self.initialParent = parseRevision(self.branch)
-                if not self.silent:
+                if not self.silent and not self.detectBranches:
                     print "Performing incremental import into %s git branch" % self.branch
 
         if not self.branch.startswith("refs/"):
@@ -698,7 +918,6 @@ class P4Sync(Command):
 
         self.revision = ""
         self.users = {}
-        self.lastChange = 0
 
         if self.depotPath.find("@") != -1:
             atIdx = self.depotPath.index("@")
@@ -722,14 +941,20 @@ class P4Sync(Command):
         if not self.depotPath.endswith("/"):
             self.depotPath += "/"
 
-        self.getUserMap()
+        self.loadUserMapFromCache()
         self.labels = {}
         if self.detectLabels:
             self.getLabels();
 
         if self.detectBranches:
             self.getBranchMapping();
-            self.branchPrefix = self.depotPath[self.depotPath[:-1].rfind("/") + 1:]
+            if self.verbose:
+                print "p4-git branches: %s" % self.p4BranchesInGit
+                print "initial parents: %s" % self.initialParents
+            for b in self.p4BranchesInGit:
+                if b != "master":
+                    b = b[len(self.projectName):]
+                self.createdBranches.add(b)
 
         self.tz = "%+03d%02d" % (- time.timezone / 3600, ((- time.timezone % 3600) / 60))
 
@@ -784,6 +1009,8 @@ class P4Sync(Command):
 
                 changes.sort()
             else:
+                if self.verbose:
+                    print "Getting p4 changes for %s...%s" % (self.depotPath, self.changeRange)
                 output = mypopen("p4 changes %s...%s" % (self.depotPath, self.changeRange)).readlines()
 
                 for line in output:
@@ -792,66 +1019,96 @@ class P4Sync(Command):
 
                 changes.reverse()
 
+                if len(self.maxChanges) > 0:
+                    changes = changes[0:min(int(self.maxChanges), len(changes))]
+
             if len(changes) == 0:
                 if not self.silent:
-                    print "no changes to import!"
+                    print "No changes to import!"
                 return True
 
+            self.updatedBranches = set()
+
             cnt = 1
             for change in changes:
                 description = p4Cmd("describe %s" % change)
 
                 if not self.silent:
-                    sys.stdout.write("\rimporting revision %s (%s%%)" % (change, cnt * 100 / len(changes)))
+                    sys.stdout.write("\rImporting revision %s (%s%%)" % (change, cnt * 100 / len(changes)))
                     sys.stdout.flush()
                 cnt = cnt + 1
 
                 try:
-                    files = self.extractFilesFromCommit(description)
                     if self.detectBranches:
-                        for branch in self.branchesForCommit(files):
+                        branches = self.splitFilesIntoBranches(description)
+                        for branch in branches.keys():
                             branchPrefix = self.depotPath + branch + "/"
 
                             parent = ""
 
-                            filesForCommit = self.extractFilesInCommitToBranch(files, branch)
+                            filesForCommit = branches[branch]
+
+                            if self.verbose:
+                                print "branch is %s" % branch
+
+                            self.updatedBranches.add(branch)
 
                             if branch not in self.createdBranches:
                                 self.createdBranches.add(branch)
                                 parent = self.knownBranches[branch]
                                 if parent == branch:
                                     parent = ""
+                                elif self.verbose:
+                                    print "parent determined through known branches: %s" % parent
 
                             # main branch? use master
                             if branch == "main":
                                 branch = "master"
                             else:
-                                branch = self.branchPrefix + branch
+                                branch = self.projectName + branch
 
                             if parent == "main":
                                 parent = "master"
                             elif len(parent) > 0:
-                                parent = self.branchPrefix + parent
+                                parent = self.projectName + parent
 
-                            branch = "refs/remotes/p4/" + branch
+                            branch = self.refPrefix + branch
                             if len(parent) > 0:
-                                parent = "refs/remotes/p4/" + parent
-                            self.commit(description, files, branch, branchPrefix, parent)
+                                parent = self.refPrefix + parent
+
+                            if self.verbose:
+                                print "looking for initial parent for %s; current parent is %s" % (branch, parent)
+
+                            if len(parent) == 0 and branch in self.initialParents:
+                                parent = self.initialParents[branch]
+                                del self.initialParents[branch]
+
+                            self.commit(description, filesForCommit, branch, branchPrefix, parent)
                     else:
+                        files = self.extractFilesFromCommit(description)
                         self.commit(description, files, self.branch, self.depotPath, self.initialParent)
                         self.initialParent = ""
                 except IOError:
                     print self.gitError.read()
                     sys.exit(1)
 
-        if not self.silent:
-            print ""
+            if not self.silent:
+                print ""
+                if len(self.updatedBranches) > 0:
+                    sys.stdout.write("Updated branches: ")
+                    for b in self.updatedBranches:
+                        sys.stdout.write("%s " % b)
+                    sys.stdout.write("\n")
 
 
         self.gitStream.close()
+        if importProcess.wait() != 0:
+            die("fast-import failed: %s" % self.gitError.read())
         self.gitOutput.close()
         self.gitError.close()
-        importProcess.wait()
+
+        if createP4HeadRef:
+            system("git symbolic-ref %sHEAD %s" % (self.refPrefix, self.branch))
 
         return True
 
@@ -880,6 +1137,8 @@ class P4Clone(P4Sync):
         self.needsGit = False
 
     def run(self, args):
+        global gitdir
+
         if len(args) < 1:
             return False
         depotPath = args[0]
@@ -915,6 +1174,7 @@ class P4Clone(P4Sync):
         os.makedirs(dir)
         os.chdir(dir)
         system("git init")
+        gitdir = os.getcwd() + "/.git"
         if not P4Sync.run(self, [depotPath]):
             return False
         if self.branch != "master":
@@ -948,7 +1208,8 @@ commands = {
     "submit" : P4Submit(),
     "sync" : P4Sync(),
     "rebase" : P4Rebase(),
-    "clone" : P4Clone()
+    "clone" : P4Clone(),
+    "rollback" : P4RollBack()
 }
 
 if len(sys.argv[1:]) == 0: