Code

Fix typo in listExistingP4Branches that broke sync.
[git.git] / contrib / fast-import / git-p4
index 49114d2c6f3e377b2805f0e5e3442d71fb306f41..794286ee8e43394c93c0aae66d540efc2da8d26e 100755 (executable)
@@ -2,20 +2,63 @@
 #
 # git-p4.py -- A tool for bidirectional operation between a Perforce depot and git.
 #
-# Author: Simon Hausmann <hausmann@kde.org>
-# Copyright: 2007 Simon Hausmann <hausmann@kde.org>
+# Author: Simon Hausmann <simon@lst.de>
+# Copyright: 2007 Simon Hausmann <simon@lst.de>
 #            2007 Trolltech ASA
 # License: MIT <http://www.opensource.org/licenses/mit-license.php>
 #
 
 import optparse, sys, os, marshal, popen2, subprocess, shelve
 import tempfile, getopt, sha, os.path, time, platform
+import re
+
 from sets import Set;
 
 gitdir = os.environ.get("GIT_DIR", "")
+silent = True
+
+def write_pipe(c, str):
+    if not silent:
+        sys.stderr.write('writing pipe: %s\n' % c)
+
+    pipe = os.popen(c, 'w')
+    val = pipe.write(str)
+    if pipe.close():
+        sys.stderr.write('Command failed: %s' % c)
+        sys.exit(1)
+
+    return val
+
+def read_pipe(c):
+    if not silent:
+        sys.stderr.write('reading pipe: %s\n' % c)
+
+    pipe = os.popen(c, 'rb')
+    val = pipe.read()
+    if pipe.close():
+        sys.stderr.write('Command failed: %s' % c)
+        sys.exit(1)
 
-def mypopen(command):
-    return os.popen(command, "rb");
+    return val
+
+
+def read_pipe_lines(c):
+    if not silent:
+        sys.stderr.write('reading pipe: %s\n' % c)
+    ## todo: check return status
+    pipe = os.popen(c, 'rb')
+    val = pipe.readlines()
+    if pipe.close():
+        sys.stderr.write('Command failed: %s' % c)
+        sys.exit(1)
+
+    return val
+
+def system(cmd):
+    if not silent:
+        sys.stderr.write("executing %s" % cmd)
+    if os.system(cmd) != 0:
+        die("command failed: %s" % cmd)
 
 def p4CmdList(cmd):
     cmd = "p4 -G %s" % cmd
@@ -28,7 +71,11 @@ 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 +90,8 @@ 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")
@@ -60,7 +109,7 @@ def die(msg):
     sys.exit(1)
 
 def currentGitBranch():
-    return mypopen("git name-rev HEAD").read().split(" ")[1][:-1]
+    return read_pipe("git name-rev HEAD").split(" ")[1].strip()
 
 def isValidGitDir(path):
     if os.path.exists(path + "/HEAD") and os.path.exists(path + "/refs") and os.path.exists(path + "/objects"):
@@ -68,16 +117,14 @@ def isValidGitDir(path):
     return False
 
 def parseRevision(ref):
-    return mypopen("git rev-parse %s" % ref).read()[:-1]
-
-def system(cmd):
-    if os.system(cmd) != 0:
-        die("command failed: %s" % cmd)
+    return read_pipe("git rev-parse %s" % ref).strip()
 
 def extractLogMessageFromGitCommit(commit):
     logMessage = ""
+
+    ## fixme: title is first line of commit, not 1st paragraph.
     foundTitle = False
-    for log in mypopen("git cat-file commit %s" % commit).readlines():
+    for log in read_pipe_lines("git cat-file commit %s" % commit):
        if not foundTitle:
            if len(log) == 1:
                foundTitle = True
@@ -109,6 +156,9 @@ def gitBranchExists(branch):
     proc = subprocess.Popen(["git", "rev-parse", branch], stderr=subprocess.PIPE, stdout=subprocess.PIPE);
     return proc.wait() == 0;
 
+def gitConfig(key):
+    return os.popen("git config %s" % key, "rb").read()[:-1]
+
 class Command:
     def __init__(self):
         self.usage = "usage: %prog [options]"
@@ -127,6 +177,58 @@ 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 = read_pipe_lines("git rev-parse --symbolic --branches")
+        else:
+            refPrefix = "refs/remotes/"
+            lines = read_pipe_lines("git rev-parse --symbolic --remotes")
+
+        for line in lines:
+            if self.rollbackLocalBranches or (line.startswith("p4/") and line != "p4/HEAD\n"):
+                line = line.strip()
+                ref = refPrefix + line
+                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)
@@ -135,8 +237,9 @@ class P4Submit(Command):
                 optparse.make_option("--origin", dest="origin"),
                 optparse.make_option("--reset", action="store_true", dest="reset"),
                 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"),
+                optparse.make_option("--trust-me-like-a-fool", dest="trustMeLikeAFool", 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 +250,8 @@ class P4Submit(Command):
         self.substFile = ""
         self.firstTime = True
         self.origin = ""
+        self.directSubmit = False
+        self.trustMeLikeAFool = False
 
         self.logSubstitutions = {}
         self.logSubstitutions["<enter description here>"] = "%log%"
@@ -158,12 +263,17 @@ class P4Submit(Command):
 
     def start(self):
         if len(self.config) > 0 and not self.reset:
-            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)
+            die("Cannot start sync. Previous sync config found at %s\n"
+                "If 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 read_pipe_lines("git rev-list --no-merges %s..%s" % (self.origin, self.master)):
+                commits.append(line.strip())
+            commits.reverse()
 
         self.config["commits"] = commits
 
@@ -190,9 +300,13 @@ 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()
+    def applyCommit(self, id):
+        if self.directSubmit:
+            print "Applying local change in working directory/index"
+            diff = self.diffStatus
+        else:
+            print "Applying %s" % (read_pipe("git log --max-count=1 --pretty=oneline %s" % id))
+            diff = read_pipe_lines("git diff-tree -r --name-status \"%s^\" \"%s\"" % (id, id))
         filesToAdd = set()
         filesToDelete = set()
         editedFiles = set()
@@ -213,33 +327,41 @@ 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"
             while response != "s" and response != "a" and response != "w":
-                response = raw_input("[s]kip this patch / [a]pply the patch forcibly and with .rej files / [w]rite the patch to a file (patch.txt) ")
+                response = raw_input("[s]kip this patch / [a]pply the patch forcibly "
+                                     "and with .rej files / [w]rite the patch to a file (patch.txt) ")
             if response == "s":
                 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)
                 if len(filesToDelete):
                     print "The following files should be scheduled for deletion with p4 delete:"
                     print " ".join(filesToDelete)
-                die("Please resolve and submit the conflict manually and continue afterwards with git-p4 submit --continue")
+                die("Please resolve and submit the conflict manually and "
+                    + "continue afterwards with git-p4 submit --continue")
             elif response == "w":
                 system(diffcmd + " > patch.txt")
                 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")
+                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)
@@ -247,15 +369,17 @@ 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.strip()
 
-        template = mypopen("p4 change -o").read()
+        template = read_pipe("p4 change -o")
 
         if self.interactive:
             submitTemplate = self.prepareLogMessage(template, logMessage)
-            diff = mypopen("p4 diff -du ...").read()
+            diff = read_pipe("p4 diff -du ...")
 
             for newFile in filesToAdd:
                 diff += "==== new file ====\n"
@@ -272,6 +396,9 @@ class P4Submit(Command):
             separatorLine += "\n"
 
             response = "e"
+            if self.trustMeLikeAFool:
+                response = "y"
+
             firstIteration = True
             while response == "e":
                 if not firstIteration:
@@ -298,9 +425,13 @@ 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)
+                       write_pipe("git commit -a -F -", submitTemplate)
+                       os.chdir(self.clientPath)
+
+                   write_pipe("p4 submit -i", submitTemplate)
             elif response == "s":
                 for f in editedFiles:
                     system("p4 revert \"%s\"" % f);
@@ -318,7 +449,9 @@ class P4Submit(Command):
             file = open(fileName, "w+")
             file.write(self.prepareLogMessage(template, logMessage))
             file.close()
-            print "Perforce submit template written as %s. Please review/edit and then use p4 submit -i < %s to submit directly!" % (fileName, fileName)
+            print ("Perforce submit template written as %s. "
+                   + "Please review/edit and then use p4 submit -i < %s to submit directly!"
+                   % (fileName, fileName))
 
     def run(self, args):
         global gitdir
@@ -328,7 +461,7 @@ 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 +485,19 @@ 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 = read_pipe_lines("git diff -r --name-status HEAD")
+            if len(self.diffStatus) == 0:
+                print "No changes in working directory to submit."
+                return True
+            patch = read_pipe("git diff -p --binary --diff-filter=ACMRTUXB HEAD")
+            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":
@@ -369,7 +514,7 @@ class P4Submit(Command):
 
         if len(self.substFile) > 0:
             for line in open(self.substFile, "r").readlines():
-                tokens = line[:-1].split("=")
+                tokens = line.strip().split("=")
                 self.logSubstitutions[tokens[0]] = tokens[1]
 
         self.check()
@@ -386,20 +531,23 @@ class P4Submit(Command):
             commit = commits[0]
             commits = commits[1:]
             self.config["commits"] = commits
-            self.apply(commit)
+            self.applyCommit(commit)
             if not self.interactive:
                 break
 
         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)
@@ -415,8 +563,10 @@ class P4Sync(Command):
                 optparse.make_option("--changesfile", dest="changesFile"),
                 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"),
+                optparse.make_option("--keep-path", dest="keepRepoPath")
         ]
         self.description = """Imports from Perforce into a git repository.\n
     example:
@@ -427,7 +577,6 @@ class P4Sync(Command):
     (a ... is not needed in the path p4 specification, it's added implicitly)"""
 
         self.usage += " //depot/path[@revRange]"
-
         self.silent = False
         self.createdBranches = Set()
         self.committedChanges = Set()
@@ -435,11 +584,19 @@ class P4Sync(Command):
         self.detectBranches = False
         self.detectLabels = False
         self.changesFile = ""
-        self.syncWithOrigin = False
+        self.syncWithOrigin = True
         self.verbose = False
+        self.importIntoRemotes = True
+        self.maxChanges = ""
+        self.isWindows = (platform.system() == "Windows")
+        self.depotPath = None
+        self.keepRepoPath = False
+
+        if gitConfig("git-p4.syncFromOrigin") == "false":
+            self.syncWithOrigin = False
 
     def p4File(self, depotPath):
-        return os.popen("p4 print -q \"%s\"" % depotPath, "rb").read()
+        return read_pipe("p4 print -q \"%s\"" % depotPath)
 
     def extractFilesFromCommit(self, commit):
         files = []
@@ -461,9 +618,14 @@ class P4Sync(Command):
             fnum = fnum + 1
         return files
 
+    def stripRepoPath(self, path, prefix):
+        if self.keepRepoPath:
+            prefix = re.sub("^(//[^/]+/).*", r'\1', prefix)
+
+        return path[len(prefix):]
+
     def splitFilesIntoBranches(self, commit):
         branches = {}
-
         fnum = 0
         while commit.has_key("depotFile%s" % fnum):
             path =  commit["depotFile%s" % fnum]
@@ -480,10 +642,12 @@ class P4Sync(Command):
             file["type"] = commit["type%s" % fnum]
             fnum = fnum + 1
 
-            relPath = path[len(self.depotPath):]
+            relPath = self.stripRepoPath(path, self.depotPath)
 
             for branch in self.knownBranches.keys():
-                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 relPath.startswith(branch + "/"):
                     if branch not in branches:
                         branches[branch] = []
                     branches[branch].append(file)
@@ -501,6 +665,8 @@ 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:
@@ -521,12 +687,11 @@ class P4Sync(Command):
         for file in files:
             path = file["path"]
             if not path.startswith(branchPrefix):
-    #            if not silent:
     #                print "\nchanged files: ignoring path %s outside of branch prefix %s in change %s" % (path, branchPrefix, details["change"])
                 continue
             rev = file["rev"]
             depotPath = path + "#" + rev
-            relPath = path[len(branchPrefix):]
+            relPath = self.stripRepoPath(path, branchPrefix)
             action = file["action"]
 
             if file["type"] == "apple":
@@ -542,6 +707,9 @@ 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)
@@ -551,9 +719,7 @@ 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]
@@ -587,13 +753,17 @@ class P4Sync(Command):
 
                 else:
                     if not self.silent:
-                        print "Tag %s does not match with change %s: files do not match." % (labelDetails["label"], change)
+                        print ("Tag %s does not match with change %s: files do not match."
+                               % (labelDetails["label"], change))
 
             else:
                 if not self.silent:
-                    print "Tag %s does not match with change %s: file count is different." % (labelDetails["label"], change)
+                    print ("Tag %s does not match with change %s: file count is different."
+                           % (labelDetails["label"], change))
 
-    def getUserMap(self):
+    def getUserMapFromPerforceServer(self):
+        if self.userMapFromPerforceServer:
+            return
         self.users = {}
 
         for output in p4CmdList("users"):
@@ -601,6 +771,25 @@ 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.strip().split("\t")
+                self.users[entry[0]] = entry[1]
+        except IOError:
+            self.getUserMapFromPerforceServer()
+
     def getLabels(self):
         self.labels = {}
 
@@ -620,10 +809,13 @@ class P4Sync(Command):
                 if change > newestChange:
                     newestChange = change
 
-            self.labels[int(newestChange)] = [output, revisions]
+            self.labels[newestChange] = [output, revisions]
+
+        if self.verbose:
+            print "Label changes: %s" % self.labels.keys()
 
     def getBranchMapping(self):
-        self.projectName = self.depotPath[self.depotPath[:-1].rfind("/") + 1:]
+        self.projectName = self.depotPath[self.depotPath.strip().rfind("/") + 1:]
 
         for info in p4CmdList("branches"):
             details = p4Cmd("branch -o %s" % info["branch"])
@@ -647,64 +839,107 @@ class P4Sync(Command):
     def listExistingP4GitBranches(self):
         self.p4BranchesInGit = []
 
-        for line in mypopen("git rev-parse --symbolic --remotes").readlines():
-            if line.startswith("p4/") and line != "p4/HEAD\n":
-                branch = line[3:-1]
-                self.p4BranchesInGit.append(branch)
-                self.initialParents["refs/remotes/p4/" + branch] = parseRevision(line[:-1])
+        cmdline = "git rev-parse --symbolic "
+        if self.importIntoRemotes:
+            cmdline += " --remotes"
+        else:
+            cmdline += " --branches"
+
+        for line in read_pipe_lines(cmdline):
+            line = line.strip()
+            if self.importIntoRemotes and ((not line.startswith("p4/")) or line == "p4/HEAD"):
+                continue
+
+            if self.importIntoRemotes:
+                # strip off p4
+                branch = re.sub ("^p4/", "", line)
+
+            self.p4BranchesInGit.append(branch)
+            self.initialParents[self.refPrefix + branch] = parseRevision(line)
+
+    def createOrUpdateBranchesFromOrigin(self):
+        if not self.silent:
+            print "Creating/updating branch(es) in %s based on origin branch(es)" % self.refPrefix
+
+        for line in read_pipe_lines("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 = {}
+        self.hasOrigin = gitBranchExists("origin")
 
-        self.listExistingP4GitBranches()
-
-        if self.syncWithOrigin and gitBranchExists("origin") and gitBranchExists("refs/remotes/p4/master") and not self.detectBranches:
-            ### needs to be ported to multi branch import
+        if self.importIntoRemotes:
+            self.refPrefix = "refs/remotes/p4/"
+        else:
+            self.refPrefix = "refs/heads/"
 
-            print "Syncing with origin first as requested by calling git fetch origin"
+        if self.syncWithOrigin and self.hasOrigin:
+            if not self.silent:
+                print "Syncing with origin first 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)
 
         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:
+                system("git symbolic-ref %sHEAD %s" % (self.refPrefix, self.branch))
 
         if len(args) == 0:
-            if not gitBranchExists(self.branch) and gitBranchExists("origin") and not self.detectBranches:
-                ### needs to be ported to multi branch import
+            if self.hasOrigin:
+                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)
+                    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("refs/remotes/p4/" + branch))
+                logMsg =  extractLogMessageFromGitCommit(self.refPrefix + branch)
+                (depotPath, change) = extractDepotPathAndChangeFromGitLog(logMsg)
 
                 if self.verbose:
                     print "path %s change %s" % (depotPath, change)
@@ -726,14 +961,14 @@ class P4Sync(Command):
                 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/"):
             self.branch = "refs/heads/" + self.branch
 
         if len(self.depotPath) != 0:
-            self.depotPath = self.depotPath[:-1]
+            self.depotPath = self.depotPath.strip()
 
         if len(args) == 0 and len(self.depotPath) != 0:
             if not self.silent:
@@ -742,13 +977,13 @@ class P4Sync(Command):
             return False
         else:
             if len(self.depotPath) != 0 and self.depotPath != args[0]:
-                print "previous import used depot path %s and now %s was specified. this doesn't work!" % (self.depotPath, args[0])
+                print ("previous import used depot path %s and now %s was specified. "
+                       "This doesn't work!" % (self.depotPath, args[0]))
                 sys.exit(1)
             self.depotPath = args[0]
 
         self.revision = ""
         self.users = {}
-        self.lastChange = 0
 
         if self.depotPath.find("@") != -1:
             atIdx = self.depotPath.index("@")
@@ -766,13 +1001,11 @@ class P4Sync(Command):
         elif len(self.previousDepotPath) == 0:
             self.revision = "#head"
 
-        if self.depotPath.endswith("..."):
-            self.depotPath = self.depotPath[:-3]
-
+        self.depotPath = re.sub ("\.\.\.$", "", self.depotPath)
         if not self.depotPath.endswith("/"):
             self.depotPath += "/"
 
-        self.getUserMap()
+        self.loadUserMapFromCache()
         self.labels = {}
         if self.detectLabels:
             self.getLabels();
@@ -789,7 +1022,8 @@ class P4Sync(Command):
 
         self.tz = "%+03d%02d" % (- time.timezone / 3600, ((- time.timezone % 3600) / 60))
 
-        importProcess = subprocess.Popen(["git", "fast-import"], stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE);
+        importProcess = subprocess.Popen(["git", "fast-import"],
+                                         stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE);
         self.gitOutput = importProcess.stdout
         self.gitStream = importProcess.stdin
         self.gitError = importProcess.stderr
@@ -798,7 +1032,8 @@ class P4Sync(Command):
             print "Doing initial import of %s from revision %s" % (self.depotPath, self.revision)
 
             details = { "user" : "git perforce import user", "time" : int(time.time()) }
-            details["desc"] = "Initial import of %s from the state at revision %s" % (self.depotPath, self.revision)
+            details["desc"] = ("Initial import of %s from the state at revision %s"
+                               % (self.depotPath, self.revision))
             details["change"] = self.revision
             newestRevision = 0
 
@@ -842,7 +1077,7 @@ class P4Sync(Command):
             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()
+                output = read_pipe_lines("p4 changes %s...%s" % (self.depotPath, self.changeRange))
 
                 for line in output:
                     changeNum = line.split(" ")[1]
@@ -850,17 +1085,22 @@ 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
 
@@ -877,6 +1117,8 @@ class P4Sync(Command):
                             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]
@@ -896,9 +1138,9 @@ class P4Sync(Command):
                             elif len(parent) > 0:
                                 parent = self.projectName + parent
 
-                            branch = "refs/remotes/p4/" + branch
+                            branch = self.refPrefix + branch
                             if len(parent) > 0:
-                                parent = "refs/remotes/p4/" + parent
+                                parent = self.refPrefix + parent
 
                             if self.verbose:
                                 print "looking for initial parent for %s; current parent is %s" % (branch, parent)
@@ -916,8 +1158,13 @@ class P4Sync(Command):
                     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()
@@ -931,16 +1178,15 @@ class P4Sync(Command):
 class P4Rebase(Command):
     def __init__(self):
         Command.__init__(self)
-        self.options = [ optparse.make_option("--with-origin", dest="syncWithOrigin", action="store_true") ]
-        self.description = "Fetches the latest revision from perforce and rebases the current work (branch) against it"
-        self.syncWithOrigin = False
+        self.options = [ ]
+        self.description = ("Fetches the latest revision from perforce and "
+                            + "rebases the current work (branch) against it")
 
     def run(self, args):
         sync = P4Sync()
-        sync.syncWithOrigin = self.syncWithOrigin
         sync.run([])
         print "Rebasing the current branch"
-        oldHead = mypopen("git rev-parse HEAD").read()[:-1]
+        oldHead = read_pipe("git rev-parse HEAD").strip()
         system("git rebase p4")
         system("git diff-tree --stat --summary -M %s HEAD" % oldHead)
         return True
@@ -953,41 +1199,33 @@ class P4Clone(P4Sync):
         self.needsGit = False
 
     def run(self, args):
+        global gitdir
+
         if len(args) < 1:
             return False
         depotPath = args[0]
-        dir = ""
+        destination = ""
         if len(args) == 2:
-            dir = args[1]
+            destination = args[1]
         elif len(args) > 2:
             return False
 
         if not depotPath.startswith("//"):
             return False
 
-        if len(dir) == 0:
-            dir = depotPath
-            atPos = dir.rfind("@")
-            if atPos != -1:
-                dir = dir[0:atPos]
-            hashPos = dir.rfind("#")
-            if hashPos != -1:
-                dir = dir[0:hashPos]
-
-            if dir.endswith("..."):
-                dir = dir[:-3]
+        depotDir = re.sub("(@[^@]*)$", "", depotPath)
+        depotDir = re.sub("(#[^#]*)$", "", depotDir)
+        depotDir = re.sub(r"\.\.\.$,", "", depotDir)
+        depotDir = re.sub(r"/$", "", depotDir)
 
-            if dir.endswith("/"):
-               dir = dir[:-1]
+        if not destination:
+            destination = os.path.split(depotDir)[1]
 
-            slashPos = dir.rfind("/")
-            if slashPos != -1:
-                dir = dir[slashPos + 1:]
-
-        print "Importing from %s into %s" % (depotPath, dir)
-        os.makedirs(dir)
-        os.chdir(dir)
+        print "Importing from %s into %s" % (depotPath, destination)
+        os.makedirs(destination)
+        os.chdir(destination)
         system("git init")
+        gitdir = os.getcwd() + "/.git"
         if not P4Sync.run(self, [depotPath]):
             return False
         if self.branch != "master":
@@ -1021,7 +1259,8 @@ commands = {
     "submit" : P4Submit(),
     "sync" : P4Sync(),
     "rebase" : P4Rebase(),
-    "clone" : P4Clone()
+    "clone" : P4Clone(),
+    "rollback" : P4RollBack()
 }
 
 if len(sys.argv[1:]) == 0:
@@ -1058,9 +1297,9 @@ if cmd.needsGit:
     if len(gitdir) == 0:
         gitdir = ".git"
         if not isValidGitDir(gitdir):
-            gitdir = mypopen("git rev-parse --git-dir").read()[:-1]
+            gitdir = read_pipe("git rev-parse --git-dir").strip()
             if os.path.exists(gitdir):
-                cdup = mypopen("git rev-parse --show-cdup").read()[:-1];
+                cdup = read_pipe("git rev-parse --show-cdup").strip()
                 if len(cdup) > 0:
                     os.chdir(cdup);
 
@@ -1074,4 +1313,3 @@ if cmd.needsGit:
 
 if not cmd.run(args):
     parser.print_help()
-