Fix git-p4 submit
[gitweb.git] / contrib / fast-import / git-p4
index eba7a67c68542b94447e981381c54b0f58840f31..8be0afe8284f832e1058770a66c5b261e8ebd500 100755 (executable)
@@ -2,23 +2,71 @@
 #
 # 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", "")
+verbose = False
+
+def die(msg):
+    if verbose:
+        raise Exception(msg)
+    else:
+        sys.stderr.write(msg + "\n")
+        sys.exit(1)
+
+def write_pipe(c, str):
+    if verbose:
+        sys.stderr.write('Writing pipe: %s\n' % c)
+
+    pipe = os.popen(c, 'w')
+    val = pipe.write(str)
+    if pipe.close():
+        die('Command failed: %s' % c)
+
+    return val
+
+def read_pipe(c, ignore_error=False):
+    if verbose:
+        sys.stderr.write('Reading pipe: %s\n' % c)
 
-def mypopen(command):
-    return os.popen(command, "rb");
+    pipe = os.popen(c, 'rb')
+    val = pipe.read()
+    if pipe.close() and not ignore_error:
+        die('Command failed: %s' % c)
+
+    return val
+
+
+def read_pipe_lines(c):
+    if verbose:
+        sys.stderr.write('Reading pipe: %s\n' % c)
+    ## todo: check return status
+    pipe = os.popen(c, 'rb')
+    val = pipe.readlines()
+    if pipe.close():
+        die('Command failed: %s' % c)
+
+    return val
+
+def system(cmd):
+    if verbose:
+        sys.stderr.write("executing %s\n" % cmd)
+    if os.system(cmd) != 0:
+        die("command failed: %s" % cmd)
 
 def p4CmdList(cmd):
     cmd = "p4 -G %s" % cmd
+    if verbose:
+        sys.stderr.write("Opening pipe: %s\n" % cmd)
     pipe = os.popen(cmd, "rb")
 
     result = []
@@ -28,7 +76,11 @@ 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 +95,8 @@ 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")
@@ -55,26 +109,24 @@ def p4Where(depotPath):
         clientPath = clientPath[:-3]
     return clientPath
 
-def die(msg):
-    sys.stderr.write(msg + "\n")
-    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"):
+    if (os.path.exists(path + "/HEAD")
+        and os.path.exists(path + "/refs") and os.path.exists(path + "/objects")):
         return True;
     return False
 
-def system(cmd):
-    if os.system(cmd) != 0:
-        die("command failed: %s" % cmd)
+def parseRevision(ref):
+    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
@@ -83,29 +135,38 @@ def extractLogMessageFromGitCommit(commit):
        logMessage += log
     return logMessage
 
-def extractDepotPathAndChangeFromGitLog(log):
+def extractSettingsGitLog(log):
     values = {}
     for line in log.split("\n"):
         line = line.strip()
-        if line.startswith("[git-p4:") and line.endswith("]"):
-            line = line[8:-1].strip()
-            for assignment in line.split(":"):
-                variable = assignment.strip()
-                value = ""
-                equalPos = assignment.find("=")
-                if equalPos != -1:
-                    variable = assignment[:equalPos].strip()
-                    value = assignment[equalPos + 1:].strip()
-                    if value.startswith("\"") and value.endswith("\""):
-                        value = value[1:-1]
-                values[variable] = value
-
-    return values.get("depot-path"), values.get("change")
+        m = re.search (r"^ *\[git-p4: (.*)\]$", line)
+        if not m:
+            continue
+
+        assignments = m.group(1).split (':')
+        for a in assignments:
+            vals = a.split ('=')
+            key = vals[0].strip()
+            val = ('='.join (vals[1:])).strip()
+            if val.endswith ('\"') and val.startswith('"'):
+                val = val[1:-1]
+
+            values[key] = val
+
+    paths = values.get("depot-paths")
+    if not paths:
+        paths = values.get("depot-path")
+    values['depot-paths'] = paths.split(',')
+    return values
 
 def gitBranchExists(branch):
-    proc = subprocess.Popen(["git", "rev-parse", branch], stderr=subprocess.PIPE, stdout=subprocess.PIPE);
+    proc = subprocess.Popen(["git", "rev-parse", branch],
+                            stderr=subprocess.PIPE, stdout=subprocess.PIPE);
     return proc.wait() == 0;
 
+def gitConfig(key):
+    return read_pipe("git config %s" % key, ignore_error=True).strip()
+
 class Command:
     def __init__(self):
         self.usage = "usage: %prog [options]"
@@ -115,51 +176,80 @@ class P4Debug(Command):
     def __init__(self):
         Command.__init__(self)
         self.options = [
-        ]
+            optparse.make_option("--verbose", dest="verbose", action="store_true",
+                                 default=False),
+            ]
         self.description = "A tool to debug the output of p4 -G."
         self.needsGit = False
+        self.verbose = False
 
     def run(self, args):
+        j = 0
         for output in p4CmdList(" ".join(args)):
+            print 'Element: %d' % j
+            j += 1
             print output
         return True
 
-class P4CleanTags(Command):
+class P4RollBack(Command):
     def __init__(self):
         Command.__init__(self)
         self.options = [
-#                optparse.make_option("--branch", dest="branch", default="refs/heads/master")
+            optparse.make_option("--verbose", dest="verbose", action="store_true"),
+            optparse.make_option("--local", dest="rollbackLocalBranches", action="store_true")
         ]
-        self.description = "A tool to remove stale unused tags from incremental perforce imports."
+        self.description = "A tool to debug the multi-branch import. Don't use :)"
+        self.verbose = False
+        self.rollbackLocalBranches = False
+
     def run(self, args):
-        branch = currentGitBranch()
-        print "Cleaning out stale p4 import tags..."
-        sout, sin, serr = popen2.popen3("git name-rev --tags `git rev-parse %s`" % branch)
-        output = sout.read()
-        try:
-            tagIdx = output.index(" tags/p4/")
-        except:
-            print "Cannot find any p4/* tag. Nothing to do."
-            sys.exit(0)
+        if len(args) != 1:
+            return False
+        maxChange = int(args[0])
 
-        try:
-            caretIdx = output.index("^")
-        except:
-            caretIdx = len(output) - 1
-        rev = int(output[tagIdx + 9 : caretIdx])
+        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")
 
-        allTags = mypopen("git tag -l p4/").readlines()
-        for i in range(len(allTags)):
-            allTags[i] = int(allTags[i][3:-1])
+        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)
+                settings = extractSettingsGitLog(log)
 
-        allTags.sort()
+                depotPaths = settings['depot-paths']
+                change = settings['change']
+
+                changed = False
+
+                if len(p4Cmd("changes -m 1 "  + ' '.join (['%s...@%s' % (p, maxChange)
+                                                           for p in depotPaths]))) == 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
 
-        allTags.remove(rev)
+                while change 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)
+                    settings =  extractSettingsGitLog(log)
 
-        for rev in allTags:
-            print mypopen("git tag -d p4/%s" % rev).read()
 
-        print "%s tags removed." % len(allTags)
+                    depotPaths = settings['depot-paths']
+                    change = settings['change']
+
+                if changed:
+                    print "%s rewound to %s" % (ref, change)
+
         return True
 
 class P4Submit(Command):
@@ -167,11 +257,13 @@ class P4Submit(Command):
         Command.__init__(self)
         self.options = [
                 optparse.make_option("--continue", action="store_false", dest="firstTime"),
+                optparse.make_option("--verbose", dest="verbose", action="store_true"),
                 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]"
@@ -182,6 +274,9 @@ class P4Submit(Command):
         self.substFile = ""
         self.firstTime = True
         self.origin = ""
+        self.directSubmit = False
+        self.trustMeLikeAFool = False
+        self.verbose = False
 
         self.logSubstitutions = {}
         self.logSubstitutions["<enter description here>"] = "%log%"
@@ -193,12 +288,17 @@ 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" % 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
 
@@ -225,9 +325,13 @@ 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()
@@ -248,33 +352,41 @@ 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)
@@ -282,15 +394,17 @@ 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"
@@ -307,6 +421,9 @@ class P4Submit(Command):
             separatorLine += "\n"
 
             response = "e"
+            if self.trustMeLikeAFool:
+                response = "y"
+
             firstIteration = True
             while response == "e":
                 if not firstIteration:
@@ -333,9 +450,13 @@ 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);
@@ -353,17 +474,14 @@ 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
-        # make gitdir absolute so we can cd out into the perforce checkout
-        gitdir = os.path.abspath(gitdir)
-        os.environ["GIT_DIR"] = gitdir
-
         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]
@@ -371,10 +489,12 @@ class P4Submit(Command):
             return False
 
         depotPath = ""
+        settings = None
         if gitBranchExists("p4"):
-            [depotPath, dummy] = extractDepotPathAndChangeFromGitLog(extractLogMessageFromGitCommit("p4"))
+            settings = extractSettingsGitLog(extractLogMessageFromGitCommit("p4"))
         if len(depotPath) == 0 and gitBranchExists("origin"):
-            [depotPath, dummy] = extractDepotPathAndChangeFromGitLog(extractLogMessageFromGitCommit("origin"))
+            settings = extractSettingsGitLog(extractLogMessageFromGitCommit("origin"))
+        depotPaths = settings['depot-paths']
 
         if len(depotPath) == 0:
             print "Internal error: cannot locate perforce depot path from existing branches"
@@ -387,7 +507,19 @@ 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 = self.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":
@@ -404,11 +536,11 @@ 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()
-        self.configFile = gitdir + "/p4-git-sync.cfg"
+        self.configFile = self.gitdir + "/p4-git-sync.cfg"
         self.config = shelve.open(self.configFile, writeback=True)
 
         if self.firstTime:
@@ -421,20 +553,23 @@ 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)
@@ -449,10 +584,13 @@ class P4Sync(Command):
                 optparse.make_option("--detect-branches", dest="detectBranches", action="store_true"),
                 optparse.make_option("--changesfile", dest="changesFile"),
                 optparse.make_option("--silent", dest="silent", action="store_true"),
-                optparse.make_option("--known-branches", dest="knownBranches"),
-                optparse.make_option("--data-cache", dest="dataCache", action="store_true"),
-                optparse.make_option("--command-cache", dest="commandCache", action="store_true"),
-                optparse.make_option("--detect-labels", dest="detectLabels", action="store_true")
+                optparse.make_option("--detect-labels", dest="detectLabels", action="store_true"),
+                optparse.make_option("--verbose", dest="verbose", action="store_true"),
+                optparse.make_option("--import-local", dest="importIntoRemotes", action="store_false",
+                                     help="Import into refs/heads/ , not refs/remotes"),
+                optparse.make_option("--max-changes", dest="maxChanges"),
+                optparse.make_option("--keep-path", dest="keepRepoPath", action='store_true',
+                                     help="Keep entire BRANCH/DIR/SUBDIR prefix during import")
         ]
         self.description = """Imports from Perforce into a git repository.\n
     example:
@@ -463,29 +601,33 @@ class P4Sync(Command):
     (a ... is not needed in the path p4 specification, it's added implicitly)"""
 
         self.usage += " //depot/path[@revRange]"
-
-        self.dataCache = False
-        self.commandCache = False
         self.silent = False
-        self.knownBranches = Set()
         self.createdBranches = Set()
         self.committedChanges = Set()
         self.branch = ""
         self.detectBranches = False
         self.detectLabels = False
         self.changesFile = ""
+        self.syncWithOrigin = True
+        self.verbose = False
+        self.importIntoRemotes = True
+        self.maxChanges = ""
+        self.isWindows = (platform.system() == "Windows")
+        self.keepRepoPath = False
+        self.depotPaths = None
 
-    def p4File(self, depotPath):
-        return os.popen("p4 print -q \"%s\"" % depotPath, "rb").read()
+        if gitConfig("git-p4.syncFromOrigin") == "false":
+            self.syncWithOrigin = False
 
     def extractFilesFromCommit(self, commit):
         files = []
         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)
+
+            found = [p for p in self.depotPaths
+                     if path.startswith (p)]
+            if not found:
                 fnum = fnum + 1
                 continue
 
@@ -498,124 +640,102 @@ class P4Sync(Command):
             fnum = fnum + 1
         return files
 
-    def isSubPathOf(self, first, second):
-        if not first.startswith(second):
-            return False
-        if first == second:
-            return True
-        return first[len(second)] == "/"
+    def stripRepoPath(self, path, prefixes):
+        if self.keepRepoPath:
+            prefixes = [re.sub("^(//[^/]+/).*", r'\1', prefixes[0])]
 
-    def branchesForCommit(self, files):
-        branches = Set()
+        for p in prefixes:
+            if path.startswith(p):
+                path = path[len(p):]
 
-        for file in files:
-            relativePath = file["path"][len(self.depotPath):]
-            # strip off the filename
-            relativePath = relativePath[0:relativePath.rfind("/")]
-
-    #        if len(branches) == 0:
-    #            branches.add(relativePath)
-    #            knownBranches.add(relativePath)
-    #            continue
-
-            ###### this needs more testing :)
-            knownBranch = False
-            for branch in branches:
-                if relativePath == branch:
-                    knownBranch = True
-                    break
-    #            if relativePath.startswith(branch):
-                if self.isSubPathOf(relativePath, branch):
-                    knownBranch = True
-                    break
-    #            if branch.startswith(relativePath):
-                if self.isSubPathOf(branch, relativePath):
-                    branches.remove(branch)
-                    break
+        return path
 
-            if knownBranch:
+    def splitFilesIntoBranches(self, commit):
+        branches = {}
+        fnum = 0
+        while commit.has_key("depotFile%s" % fnum):
+            path =  commit["depotFile%s" % fnum]
+            found = [p for p in self.depotPaths
+                     if path.startswith (p)]
+            if not found:
+                fnum = fnum + 1
                 continue
 
-            for branch in self.knownBranches:
-                #if relativePath.startswith(branch):
-                if self.isSubPathOf(relativePath, branch):
-                    if len(branches) == 0:
-                        relativePath = branch
-                    else:
-                        knownBranch = True
-                    break
+            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
 
-            if knownBranch:
-                continue
+            relPath = self.stripRepoPath(path, self.depotPaths)
+
+            for branch in self.knownBranches.keys():
 
-            branches.add(relativePath)
-            self.knownBranches.add(relativePath)
+                # 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)
 
         return branches
 
-    def findBranchParent(self, branchPrefix, files):
-        for file in files:
-            path = file["path"]
-            if not path.startswith(branchPrefix):
-                continue
-            action = file["action"]
-            if action != "integrate" and action != "branch":
-                continue
-            rev = file["rev"]
-            depotPath = path + "#" + rev
-
-            log = p4CmdList("filelog \"%s\"" % depotPath)
-            if len(log) != 1:
-                print "eek! I got confused by the filelog of %s" % depotPath
-                sys.exit(1);
-
-            log = log[0]
-            if log["action0"] != action:
-                print "eek! wrong action in filelog for %s : found %s, expected %s" % (depotPath, log["action0"], action)
-                sys.exit(1);
-
-            branchAction = log["how0,0"]
-    #        if branchAction == "branch into" or branchAction == "ignored":
-    #            continue # ignore for branching
-
-            if not branchAction.endswith(" from"):
-                continue # ignore for branching
-    #            print "eek! file %s was not branched from but instead: %s" % (depotPath, branchAction)
-    #            sys.exit(1);
-
-            source = log["file0,0"]
-            if source.startswith(branchPrefix):
-                continue
+    ## Should move this out, doesn't use SELF.
+    def readP4Files(self, files):
+        files = [f for f in files
+                 if f['action'] != 'delete']
 
-            lastSourceRev = log["erev0,0"]
+        if not files:
+            return
 
-            sourceLog = p4CmdList("filelog -m 1 \"%s%s\"" % (source, lastSourceRev))
-            if len(sourceLog) != 1:
-                print "eek! I got confused by the source filelog of %s%s" % (source, lastSourceRev)
-                sys.exit(1);
-            sourceLog = sourceLog[0]
+        filedata = p4CmdList('print %s' % ' '.join(['"%s#%s"' % (f['path'],
+                                                                 f['rev'])
+                                                    for f in files]))
 
-            relPath = source[len(self.depotPath):]
-            # strip off the filename
-            relPath = relPath[0:relPath.rfind("/")]
+        j = 0;
+        contents = {}
+        while j < len(filedata):
+            stat = filedata[j]
+            j += 1
+            text = ''
+            while j < len(filedata) and filedata[j]['code'] in ('text',
+                                                                'binary'):
+                text += filedata[j]['data']
+                j += 1
 
-            for branch in self.knownBranches:
-                if self.isSubPathOf(relPath, branch):
-    #                print "determined parent branch branch %s due to change in file %s" % (branch, source)
-                    return branch
-    #            else:
-    #                print "%s is not a subpath of branch %s" % (relPath, branch)
+            contents[stat['depotFile']] = text
 
-        return ""
+        for f in files:
+            assert not f.has_key('data')
+            f['data'] = contents[f['path']]
 
-    def commit(self, details, files, branch, branchPrefix, parent = "", merged = ""):
+    def commit(self, details, files, branch, branchPrefixes, parent = ""):
         epoch = details["time"]
         author = details["user"]
 
+        if self.verbose:
+            print "commit into %s" % branch
+
+        # start with reading files; if that fails, we should not
+        # create a commit.
+        new_files = []
+        for f in files:
+            if [p for p in branchPrefixes if f['path'].startswith(p)]:
+                new_files.append (f)
+            else:
+                sys.stderr.write("Ignoring file outside of prefix: %s\n" % path)
+        files = new_files
+        self.readP4Files(files)
+
+
+
+
         self.gitStream.write("commit %s\n" % branch)
-    #    gitStream.write("mark :%s\n" % details["change"])
+#        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:
@@ -625,40 +745,37 @@ class P4Sync(Command):
 
         self.gitStream.write("data <<EOT\n")
         self.gitStream.write(details["desc"])
-        self.gitStream.write("\n[git-p4: depot-path = \"%s\": change = %s]\n" % (branchPrefix, details["change"]))
+        self.gitStream.write("\n[git-p4: depot-paths = \"%s\": change = %s: "
+                             "options = %s]\n"
+                             % (','.join (branchPrefixes), details["change"],
+                                details['options']
+                                ))
         self.gitStream.write("EOT\n\n")
 
         if len(parent) > 0:
+            if self.verbose:
+                print "parent %s" % parent
             self.gitStream.write("from %s\n" % parent)
 
-        if len(merged) > 0:
-            self.gitStream.write("merge %s\n" % merged)
-
         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):]
-            action = file["action"]
-
             if file["type"] == "apple":
-                print "\nfile %s is a strange apple file that forks. Ignoring!" % path
+                print "\nfile %s is a strange apple file that forks. Ignoring!" % file['path']
                 continue
 
-            if action == "delete":
+            relPath = self.stripRepoPath(file['path'], branchPrefixes)
+            if file["action"] == "delete":
                 self.gitStream.write("D %s\n" % relPath)
             else:
                 mode = 644
                 if file["type"].startswith("x"):
                     mode = 755
 
-                data = self.p4File(depotPath)
+                data = file['data']
+
+                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("M %d inline %s\n" % (mode, relPath))
                 self.gitStream.write("data %s\n" % len(data))
                 self.gitStream.write(data)
                 self.gitStream.write("\n")
@@ -667,14 +784,15 @@ 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))
+            files = p4CmdList("files " + ' '.join (["%s...@%s" % (p, change)
+                                                    for p in branchPrefixes]))
 
             if len(files) == len(labelRevisions):
 
@@ -701,266 +819,354 @@ 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 extractFilesInCommitToBranch(self, files, branchPrefix):
-        newFiles = []
+    def getUserCacheFilename(self):
+        return os.environ["HOME"] + "/.gitp4-usercache.txt"
 
-        for file in files:
-            path = file["path"]
-            if path.startswith(branchPrefix):
-                newFiles.append(file)
-
-        return newFiles
+    def getUserMapFromPerforceServer(self):
+        if self.userMapFromPerforceServer:
+            return
+        self.users = {}
 
-    def findBranchSourceHeuristic(self, files, branch, branchPrefix):
-        for file in files:
-            action = file["action"]
-            if action != "integrate" and action != "branch":
+        for output in p4CmdList("users"):
+            if not output.has_key("User"):
                 continue
-            path = file["path"]
-            rev = file["rev"]
-            depotPath = path + "#" + rev
+            self.users[output["User"]] = output["FullName"] + " <" + output["Email"] + ">"
 
-            log = p4CmdList("filelog \"%s\"" % depotPath)
-            if len(log) != 1:
-                print "eek! I got confused by the filelog of %s" % depotPath
-                sys.exit(1);
 
-            log = log[0]
-            if log["action0"] != action:
-                print "eek! wrong action in filelog for %s : found %s, expected %s" % (depotPath, log["action0"], action)
-                sys.exit(1);
+        s = ''
+        for (key, val) in self.users.items():
+            s += "%s\t%s\n" % (key, val)
 
-            branchAction = log["how0,0"]
+        open(self.getUserCacheFilename(), "wb").write(s)
+        self.userMapFromPerforceServer = True
 
-            if not branchAction.endswith(" from"):
-                continue # ignore for branching
-    #            print "eek! file %s was not branched from but instead: %s" % (depotPath, branchAction)
-    #            sys.exit(1);
+    def loadUserMapFromCache(self):
+        self.users = {}
+        self.userMapFromPerforceServer = False
+        try:
+            cache = open(self.getUserCacheFilename(), "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()
 
-            source = log["file0,0"]
-            if source.startswith(branchPrefix):
-                continue
+    def getLabels(self):
+        self.labels = {}
 
-            lastSourceRev = log["erev0,0"]
+        l = p4CmdList("labels %s..." % ' '.join (self.depotPaths))
+        if len(l) > 0 and not self.silent:
+            print "Finding files belonging to labels in %s" % `self.depotPath`
 
-            sourceLog = p4CmdList("filelog -m 1 \"%s%s\"" % (source, lastSourceRev))
-            if len(sourceLog) != 1:
-                print "eek! I got confused by the source filelog of %s%s" % (source, lastSourceRev)
-                sys.exit(1);
-            sourceLog = sourceLog[0]
+        for output in l:
+            label = output["label"]
+            revisions = {}
+            newestChange = 0
+            if self.verbose:
+                print "Querying files for label %s" % label
+            for file in p4CmdList("files "
+                                  +  ' '.join (["%s...@%s" % (p, label)
+                                                for p in self.depotPaths])):
+                revisions[file["depotFile"]] = file["rev"]
+                change = int(file["change"])
+                if change > newestChange:
+                    newestChange = change
 
-            relPath = source[len(self.depotPath):]
-            # strip off the filename
-            relPath = relPath[0:relPath.rfind("/")]
+            self.labels[newestChange] = [output, revisions]
 
-            for candidate in self.knownBranches:
-                if self.isSubPathOf(relPath, candidate) and candidate != branch:
-                    return candidate
+        if self.verbose:
+            print "Label changes: %s" % self.labels.keys()
 
-        return ""
+    def guessProjectName(self):
+        for p in self.depotPaths:
+            return p [p.strip().rfind("/") + 1:]
 
-    def changeIsBranchMerge(self, sourceBranch, destinationBranch, change):
-        sourceFiles = {}
-        for file in p4CmdList("files %s...@%s" % (self.depotPath + sourceBranch + "/", change)):
-            if file["action"] == "delete":
-                continue
-            sourceFiles[file["depotFile"]] = file
-
-        destinationFiles = {}
-        for file in p4CmdList("files %s...@%s" % (self.depotPath + destinationBranch + "/", change)):
-            destinationFiles[file["depotFile"]] = file
-
-        for fileName in sourceFiles.keys():
-            integrations = []
-            deleted = False
-            integrationCount = 0
-            for integration in p4CmdList("integrated \"%s\"" % fileName):
-                toFile = integration["fromFile"] # yes, it's true, it's fromFile
-                if not toFile in destinationFiles:
-                    continue
-                destFile = destinationFiles[toFile]
-                if destFile["action"] == "delete":
-    #                print "file %s has been deleted in %s" % (fileName, toFile)
-                    deleted = True
-                    break
-                integrationCount += 1
-                if integration["how"] == "branch from":
-                    continue
+    def getBranchMapping(self):
 
-                if int(integration["change"]) == change:
-                    integrations.append(integration)
-                    continue
-                if int(integration["change"]) > change:
-                    continue
+        ## FIXME - what's a P4 projectName ?
+        self.projectName = self.guessProjectName()
 
-                destRev = int(destFile["rev"])
+        for info in p4CmdList("branches"):
+            details = p4Cmd("branch -o %s" % info["branch"])
+            viewIdx = 0
+            while details.has_key("View%s" % viewIdx):
+                paths = details["View%s" % viewIdx].split(" ")
+                viewIdx = viewIdx + 1
+                # require standard //depot/foo/... //depot/bar/... mapping
+                if len(paths) != 2 or not paths[0].endswith("/...") or not paths[1].endswith("/..."):
+                    continue
+                source = paths[0]
+                destination = paths[1]
+                ## HACK
+                if source.startswith(self.depotPaths[0]) and destination.startswith(self.depotPaths[0]):
+                    source = source[len(self.depotPaths[0]):-4]
+                    destination = destination[len(self.depotPaths[0]):-4]
+                    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"
 
-                startRev = integration["startFromRev"][1:]
-                if startRev == "none":
-                    startRev = 0
-                else:
-                    startRev = int(startRev)
+        for line in read_pipe_lines(cmdline):
+            line = line.strip()
 
-                endRev = integration["endFromRev"][1:]
-                if endRev == "none":
-                    endRev = 0
-                else:
-                    endRev = int(endRev)
+            ## only import to p4/
+            if not line.startswith('p4/'):
+                continue
+            branch = line
+            if self.importIntoRemotes:
+                # strip off p4
+                branch = re.sub ("^p4/", "", line)
 
-                initialBranch = (destRev == 1 and integration["how"] != "branch into")
-                inRange = (destRev >= startRev and destRev <= endRev)
-                newer = (destRev > startRev and destRev > endRev)
+            self.p4BranchesInGit.append(branch)
+            self.initialParents[self.refPrefix + branch] = parseRevision(line)
 
-                if initialBranch or inRange or newer:
-                    integrations.append(integration)
+    def createOrUpdateBranchesFromOrigin(self):
+        if not self.silent:
+            print ("Creating/updating branch(es) in %s based on origin branch(es)"
+                   % self.refPrefix)
 
-            if deleted:
+        for line in read_pipe_lines("git rev-parse --symbolic --remotes"):
+            line = line.strip()
+            if (not line.startswith("origin/")) or line.endswith("HEAD\n"):
                 continue
 
-            if len(integrations) == 0 and integrationCount > 1:
-                print "file %s was not integrated from %s into %s" % (fileName, sourceBranch, destinationBranch)
-                return False
-
-        return True
-
-    def getUserMap(self):
-        self.users = {}
+            headName = line[len("origin/"):]
+            remoteHead = self.refPrefix + headName
+            originHead = "origin/" + headName
 
-        for output in p4CmdList("users"):
-            if not output.has_key("User"):
+            original = extractSettingsGitLog(extractLogMessageFromGitCommit(originHead))
+            if (not original.has_key('depot-paths')
+                or not original.has_key('change')):
                 continue
-            self.users[output["User"]] = output["FullName"] + " <" + output["Email"] + ">"
 
-    def getLabels(self):
-        self.labels = {}
+            update = False
+            if not gitBranchExists(remoteHead):
+                if self.verbose:
+                    print "creating %s" % remoteHead
+                update = True
+            else:
+                settings =  extractSettingsGitLog(extractLogMessageFromGitCommit(remoteHead))
+                if settings.has_key('change') > 0:
+                    if settings['depot-paths'] == original['depot-paths']:
+                        originP4Change = int(original['change'])
+                        p4Change = int(settings['change'])
+                        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, ','.join(original['depot-paths']),
+                                  remoteHead, ','.join(settings['depot-paths'])))
 
-        l = p4CmdList("labels %s..." % self.depotPath)
-        if len(l) > 0 and not self.silent:
-            print "Finding files belonging to labels in %s" % self.depotPath
+            if update:
+                system("git update-ref %s %s" % (remoteHead, originHead))
 
-        for output in l:
-            label = output["label"]
-            revisions = {}
-            newestChange = 0
-            for file in p4CmdList("files //...@%s" % label):
-                revisions[file["depotFile"]] = file["rev"]
-                change = int(file["change"])
-                if change > newestChange:
-                    newestChange = change
+    def updateOptionDict(self, d):
+        option_keys = {}
+        if self.keepRepoPath:
+            option_keys['keepRepoPath'] = 1
 
-            self.labels[newestChange] = [output, revisions]
+        d["options"] = ' '.join(sorted(option_keys.keys()))
+
+    def readOptions(self, d):
+        self.keepRepoPath = (d.has_key('options')
+                             and ('keepRepoPath' in d['options']))
 
     def run(self, args):
-        self.depotPath = ""
+        self.depotPaths = []
         self.changeRange = ""
         self.initialParent = ""
-        self.previousDepotPath = ""
+        self.previousDepotPaths = []
 
-        if len(self.branch) == 0:
-            self.branch = "p4"
+        # map from branch depot path to parent branch
+        self.knownBranches = {}
+        self.initialParents = {}
+        self.hasOrigin = gitBranchExists("origin")
 
-        if len(args) == 0:
-            if not gitBranchExists(self.branch) and gitBranchExists("origin"):
+        if self.importIntoRemotes:
+            self.refPrefix = "refs/remotes/p4/"
+        else:
+            self.refPrefix = "refs/heads/"
+
+        if self.syncWithOrigin and self.hasOrigin:
+            if not self.silent:
+                print "Syncing with origin first by calling git fetch origin"
+            system("git fetch origin")
+
+        if len(self.branch) == 0:
+            self.branch = self.refPrefix + "p4/master"
+            if gitBranchExists("refs/heads/p4") and self.importIntoRemotes:
+                system("git update-ref %s refs/heads/p4" % self.branch)
+                system("git branch -D p4");
+            # 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))
+
+        # TODO: should always look at previous commits,
+        # merge with previous imports, if possible.
+        if args == []:
+            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
-                system("git branch %s origin" % self.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:
+                logMsg =  extractLogMessageFromGitCommit(self.refPrefix + branch)
 
-            [self.previousDepotPath, p4Change] = extractDepotPathAndChangeFromGitLog(extractLogMessageFromGitCommit(self.branch))
-            if len(self.previousDepotPath) > 0 and len(p4Change) > 0:
-                p4Change = int(p4Change) + 1
-                self.depotPath = self.previousDepotPath
+                settings = extractSettingsGitLog(logMsg)
+
+                self.readOptions(settings)
+                if (settings.has_key('depot-paths')
+                    and settings.has_key ('change')):
+                    change = int(settings['change']) + 1
+                    p4Change = max(p4Change, change)
+
+                    depotPaths = sorted(settings['depot-paths'])
+                    if self.previousDepotPaths == []:
+                        self.previousDepotPaths = depotPaths
+                    else:
+                        paths = []
+                        for (prev, cur) in zip(self.previousDepotPaths, depotPaths):
+                            for i in range(0, min(len(cur), len(prev))):
+                                if cur[i] <> prev[i]:
+                                    i = i - 1
+                                    break
+
+                            paths.append (cur[:i + 1])
+
+                        self.previousDepotPaths = paths
+
+            if p4Change > 0:
+                self.depotPaths = sorted(self.previousDepotPaths)
                 self.changeRange = "@%s,#head" % p4Change
-                self.initialParent = self.branch
-                if not self.silent:
+                if not self.detectBranches:
+                    self.initialParent = parseRevision(self.branch)
+                if not self.silent and not self.detectBranches:
                     print "Performing incremental import into %s git branch" % self.branch
 
-        self.branch = "refs/heads/" + self.branch
+        if not self.branch.startswith("refs/"):
+            self.branch = "refs/heads/" + self.branch
 
-        if len(self.depotPath) != 0:
-            self.depotPath = self.depotPath[:-1]
-
-        if len(args) == 0 and len(self.depotPath) != 0:
+        if len(args) == 0 and self.depotPaths:
             if not self.silent:
-                print "Depot path: %s" % self.depotPath
-        elif len(args) != 1:
-            return False
+                print "Depot paths: %s" % ' '.join(self.depotPaths)
         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])
+            if self.depotPaths and self.depotPaths != args:
+                print ("previous import used depot path %s and now %s was specified. "
+                       "This doesn't work!" % (' '.join (self.depotPaths),
+                                               ' '.join (args)))
                 sys.exit(1)
-            self.depotPath = args[0]
+
+            self.depotPaths = sorted(args)
 
         self.revision = ""
         self.users = {}
-        self.lastChange = 0
-
-        if self.depotPath.find("@") != -1:
-            atIdx = self.depotPath.index("@")
-            self.changeRange = self.depotPath[atIdx:]
-            if self.changeRange == "@all":
-                self.changeRange = ""
-            elif self.changeRange.find(",") == -1:
-                self.revision = self.changeRange
-                self.changeRange = ""
-            self.depotPath = self.depotPath[0:atIdx]
-        elif self.depotPath.find("#") != -1:
-            hashIdx = self.depotPath.index("#")
-            self.revision = self.depotPath[hashIdx:]
-            self.depotPath = self.depotPath[0:hashIdx]
-        elif len(self.previousDepotPath) == 0:
-            self.revision = "#head"
-
-        if self.depotPath.endswith("..."):
-            self.depotPath = self.depotPath[:-3]
-
-        if not self.depotPath.endswith("/"):
-            self.depotPath += "/"
-
-        self.getUserMap()
+
+        newPaths = []
+        for p in self.depotPaths:
+            if p.find("@") != -1:
+                atIdx = p.index("@")
+                self.changeRange = p[atIdx:]
+                if self.changeRange == "@all":
+                    self.changeRange = ""
+                elif ',' not in self.changeRange:
+                    self.revision = self.changeRange
+                    self.changeRange = ""
+                p = p[0:atIdx]
+            elif p.find("#") != -1:
+                hashIdx = p.index("#")
+                self.revision = p[hashIdx:]
+                p = p[0:hashIdx]
+            elif self.previousDepotPaths == []:
+                self.revision = "#head"
+
+            p = re.sub ("\.\.\.$", "", p)
+            if not p.endswith("/"):
+                p += "/"
+
+            newPaths.append(p)
+
+        self.depotPaths = newPaths
+
+
+        self.loadUserMapFromCache()
         self.labels = {}
         if self.detectLabels:
             self.getLabels();
 
-        if len(self.changeRange) == 0:
-            try:
-                sout, sin, serr = popen2.popen3("git name-rev --tags `git rev-parse %s`" % self.branch)
-                output = sout.read()
-                if output.endswith("\n"):
-                    output = output[:-1]
-                tagIdx = output.index(" tags/p4/")
-                caretIdx = output.find("^")
-                endPos = len(output)
-                if caretIdx != -1:
-                    endPos = caretIdx
-                self.rev = int(output[tagIdx + 9 : endPos]) + 1
-                self.changeRange = "@%s,#head" % self.rev
-                self.initialParent = mypopen("git rev-parse %s" % self.branch).read()[:-1]
-            except:
-                pass
+        if self.detectBranches:
+            self.getBranchMapping();
+            if self.verbose:
+                print "p4-git branches: %s" % self.p4BranchesInGit
+                print "initial parents: %s" % self.initialParents
+            for b in self.p4BranchesInGit:
+                if b != "master":
+
+                    ## FIXME
+                    b = b[len(self.projectName):]
+                self.createdBranches.add(b)
 
         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
 
-        if len(self.revision) > 0:
-            print "Doing initial import of %s from revision %s" % (self.depotPath, self.revision)
+        if self.revision:
+            print "Doing initial import of %s from revision %s" % (' '.join(self.depotPaths), 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"
+                               % (' '.join(self.depotPaths), self.revision))
             details["change"] = self.revision
             newestRevision = 0
 
             fileCnt = 0
-            for info in p4CmdList("files %s...%s" % (self.depotPath, self.revision)):
+            for info in p4CmdList("files "
+                                  +  ' '.join(["%s...%s"
+                                               % (p, self.revision)
+                                               for p in self.depotPaths])):
+
+                if info['code'] == 'error':
+                    sys.stderr.write("p4 returned an error: %s\n"
+                                     % info['data'])
+                    sys.exit(1)
+
+
                 change = int(info["change"])
                 if change > newestRevision:
                     newestRevision = change
@@ -970,15 +1176,15 @@ class P4Sync(Command):
                     #fileCnt = fileCnt + 1
                     continue
 
-                for prop in [ "depotFile", "rev", "action", "type" ]:
+                for prop in ["depotFile", "rev", "action", "type" ]:
                     details["%s%s" % (prop, fileCnt)] = info[prop]
 
                 fileCnt = fileCnt + 1
 
             details["change"] = newestRevision
-
+            self.updateOptionDict(details)
             try:
-                self.commit(details, self.extractFilesFromCommit(details), self.branch, self.depotPath)
+                self.commit(details, self.extractFilesFromCommit(details), self.branch, self.depotPaths)
             except IOError:
                 print "IO error with git fast-import. Is your git version recent enough?"
                 print self.gitError.read()
@@ -997,7 +1203,12 @@ class P4Sync(Command):
 
                 changes.sort()
             else:
-                output = mypopen("p4 changes %s...%s" % (self.depotPath, self.changeRange)).readlines()
+                if self.verbose:
+                    print "Getting p4 changes for %s...%s" % (', '.join(self.depotPaths),
+                                                              self.changeRange)
+                assert self.depotPaths
+                output = read_pipe_lines("p4 changes " + ' '.join (["%s...%s" % (p, self.changeRange)
+                                                                    for p in self.depotPaths]))
 
                 for line in output:
                     changeNum = line.split(" ")[1]
@@ -1005,68 +1216,99 @@ 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)
+                self.updateOptionDict(description)
 
                 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):
-                            self.knownBranches.add(branch)
-                            branchPrefix = self.depotPath + branch + "/"
+                        branches = self.splitFilesIntoBranches(description)
+                        for branch in branches.keys():
+                            ## HACK  --hwn
+                            branchPrefix = self.depotPaths[0] + branch + "/"
 
-                            filesForCommit = self.extractFilesInCommitToBranch(files, branchPrefix)
-
-                            merged = ""
                             parent = ""
-                            ########### remove cnt!!!
-                            if branch not in self.createdBranches and cnt > 2:
+
+                            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.findBranchParent(branchPrefix, files)
+                                parent = self.knownBranches[branch]
                                 if parent == branch:
                                     parent = ""
-            #                    elif len(parent) > 0:
-            #                        print "%s branched off of %s" % (branch, parent)
+                                elif self.verbose:
+                                    print "parent determined through known branches: %s" % parent
+
+                            # main branch? use master
+                            if branch == "main":
+                                branch = "master"
+                            else:
 
-                            if len(parent) == 0:
-                                merged = self.findBranchSourceHeuristic(filesForCommit, branch, branchPrefix)
-                                if len(merged) > 0:
-                                    print "change %s could be a merge from %s into %s" % (description["change"], merged, branch)
-                                    if not self.changeIsBranchMerge(merged, branch, int(description["change"])):
-                                        merged = ""
+                                ## FIXME
+                                branch = self.projectName + branch
 
-                            branch = "refs/heads/" + branch
+                            if parent == "main":
+                                parent = "master"
+                            elif len(parent) > 0:
+                                ## FIXME
+                                parent = self.projectName + parent
+
+                            branch = self.refPrefix + branch
                             if len(parent) > 0:
-                                parent = "refs/heads/" + parent
-                            if len(merged) > 0:
-                                merged = "refs/heads/" + merged
-                            self.commit(description, files, branch, branchPrefix, parent, merged)
+                                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:
-                        self.commit(description, files, self.branch, self.depotPath, self.initialParent)
+                        files = self.extractFilesFromCommit(description)
+                        self.commit(description, files, self.branch, self.depotPaths,
+                                    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()
 
         return True
 
@@ -1074,13 +1316,15 @@ class P4Rebase(Command):
     def __init__(self):
         Command.__init__(self)
         self.options = [ ]
-        self.description = "Fetches the latest revision from perforce and rebases the current work (branch) against it"
+        self.description = ("Fetches the latest revision from perforce and "
+                            + "rebases the current work (branch) against it")
+        self.verbose = False
 
     def run(self, args):
         sync = P4Sync()
         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
@@ -1089,50 +1333,53 @@ class P4Clone(P4Sync):
     def __init__(self):
         P4Sync.__init__(self)
         self.description = "Creates a new git repository and imports from Perforce into it"
-        self.usage = "usage: %prog [options] //depot/path[@revRange] [directory]"
+        self.usage = "usage: %prog [options] //depot/path[@revRange]"
+        self.options.append(
+            optparse.make_option("--destination", dest="cloneDestination",
+                                 action='store', default=None,
+                                 help="where to leave result of the clone"))
+        self.cloneDestination = None
         self.needsGit = False
 
-    def run(self, args):
-        if len(args) < 1:
-            return False
+    def defaultDestination(self, args):
+        ## TODO: use common prefix of args?
         depotPath = args[0]
-        dir = ""
-        if len(args) == 2:
-            dir = args[1]
-        elif len(args) > 2:
-            return False
+        depotDir = re.sub("(@[^@]*)$", "", depotPath)
+        depotDir = re.sub("(#[^#]*)$", "", depotDir)
+        depotDir = re.sub(r"\.\.\.$,", "", depotDir)
+        depotDir = re.sub(r"/$", "", depotDir)
+        return os.path.split(depotDir)[1]
 
-        if not depotPath.startswith("//"):
+    def run(self, args):
+        if len(args) < 1:
             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]
+        if self.keepRepoPath and not self.cloneDestination:
+            sys.stderr.write("Must specify destination for --keep-path\n")
+            sys.exit(1)
 
-            if dir.endswith("/"):
-               dir = dir[:-1]
+        depotPaths = args
+        for p in depotPaths:
+            if not p.startswith("//"):
+                return False
 
-            slashPos = dir.rfind("/")
-            if slashPos != -1:
-                dir = dir[slashPos + 1:]
+        if not self.cloneDestination:
+            self.cloneDestination = self.defaultDestination()
 
-        print "Importing from %s into %s" % (depotPath, dir)
-        os.makedirs(dir)
-        os.chdir(dir)
+        print "Importing from %s into %s" % (', '.join(depotPaths), self.cloneDestination)
+        os.makedirs(self.cloneDestination)
+        os.chdir(self.cloneDestination)
         system("git init")
-        if not P4Sync.run(self, [depotPath]):
+        self.gitdir = os.getcwd() + "/.git"
+        if not P4Sync.run(self, depotPaths):
             return False
         if self.branch != "master":
-            system("git branch master p4")
-            system("git checkout -f")
+            if gitBranchExists("refs/remotes/p4/master"):
+                system("git branch master refs/remotes/p4/master")
+                system("git checkout -f")
+            else:
+                print "Could not detect main branch. No checkout/master branch created."
+
         return True
 
 class HelpFormatter(optparse.IndentedHelpFormatter):
@@ -1154,58 +1401,68 @@ def printUsage(commands):
     print ""
 
 commands = {
-    "debug" : P4Debug(),
-    "clean-tags" : P4CleanTags(),
-    "submit" : P4Submit(),
-    "sync" : P4Sync(),
-    "rebase" : P4Rebase(),
-    "clone" : P4Clone()
+    "debug" : P4Debug,
+    "submit" : P4Submit,
+    "sync" : P4Sync,
+    "rebase" : P4Rebase,
+    "clone" : P4Clone,
+    "rollback" : P4RollBack
 }
 
-if len(sys.argv[1:]) == 0:
-    printUsage(commands.keys())
-    sys.exit(2)
-
-cmd = ""
-cmdName = sys.argv[1]
-try:
-    cmd = commands[cmdName]
-except KeyError:
-    print "unknown command %s" % cmdName
-    print ""
-    printUsage(commands.keys())
-    sys.exit(2)
-
-options = cmd.options
-cmd.gitdir = gitdir
 
-args = sys.argv[2:]
+def main():
+    if len(sys.argv[1:]) == 0:
+        printUsage(commands.keys())
+        sys.exit(2)
 
-if len(options) > 0:
-    options.append(optparse.make_option("--git-dir", dest="gitdir"))
-
-    parser = optparse.OptionParser(cmd.usage.replace("%prog", "%prog " + cmdName),
-                                   options,
-                                   description = cmd.description,
-                                   formatter = HelpFormatter())
-
-    (cmd, args) = parser.parse_args(sys.argv[2:], cmd);
-
-if cmd.needsGit:
-    gitdir = cmd.gitdir
-    if len(gitdir) == 0:
-        gitdir = ".git"
-        if not isValidGitDir(gitdir):
-            gitdir = mypopen("git rev-parse --git-dir").read()[:-1]
+    cmd = ""
+    cmdName = sys.argv[1]
+    try:
+        klass = commands[cmdName]
+        cmd = klass()
+    except KeyError:
+        print "unknown command %s" % cmdName
+        print ""
+        printUsage(commands.keys())
+        sys.exit(2)
+
+    options = cmd.options
+    cmd.gitdir = os.environ.get("GIT_DIR", None)
+
+    args = sys.argv[2:]
+
+    if len(options) > 0:
+        options.append(optparse.make_option("--git-dir", dest="gitdir"))
+
+        parser = optparse.OptionParser(cmd.usage.replace("%prog", "%prog " + cmdName),
+                                       options,
+                                       description = cmd.description,
+                                       formatter = HelpFormatter())
+
+        (cmd, args) = parser.parse_args(sys.argv[2:], cmd);
+    global verbose
+    verbose = cmd.verbose
+    if cmd.needsGit:
+        if cmd.gitdir == None:
+            cmd.gitdir = os.path.abspath(".git")
+            if not isValidGitDir(cmd.gitdir):
+                cmd.gitdir = read_pipe("git rev-parse --git-dir").strip()
+                if os.path.exists(cmd.gitdir):
+                    cdup = read_pipe("git rev-parse --show-cdup").strip()
+                    if len(cdup) > 0:
+                        os.chdir(cdup);
+
+        if not isValidGitDir(cmd.gitdir):
+            if isValidGitDir(cmd.gitdir + "/.git"):
+                cmd.gitdir += "/.git"
+            else:
+                die("fatal: cannot locate git repository at %s" % cmd.gitdir)
 
-    if not isValidGitDir(gitdir):
-        if isValidGitDir(gitdir + "/.git"):
-            gitdir += "/.git"
-        else:
-            die("fatal: cannot locate git repository at %s" % gitdir)
+        os.environ["GIT_DIR"] = cmd.gitdir
 
-    os.environ["GIT_DIR"] = gitdir
+    if not cmd.run(args):
+        parser.print_help()
 
-if not cmd.run(args):
-    parser.print_help()
 
+if __name__ == '__main__':
+    main()