diff --git a/contrib/fast-import/git-p4 b/contrib/fast-import/git-p4 new file mode 100755 index 0000000000000000000000000000000000000000..54a05eb99c3eb747fcf26cfa3fc51a12f9055bd3 --- /dev/null +++ b/contrib/fast-import/git-p4 @@ -0,0 +1,1577 @@ +#!/usr/bin/env python +# +# git-p4.py -- A tool for bidirectional operation between a Perforce depot and git. +# +# Author: Simon Hausmann +# Copyright: 2007 Simon Hausmann +# 2007 Trolltech ASA +# License: MIT +# + +import optparse, sys, os, marshal, popen2, subprocess, shelve +import tempfile, getopt, sha, os.path, time, platform +import re + +from sets import Set; + +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) + + 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 = [] + try: + while True: + entry = marshal.load(pipe) + result.append(entry) + except EOFError: + pass + exitCode = pipe.close() + if exitCode != None: + entry = {} + entry["p4ExitCode"] = exitCode + result.append(entry) + + return result + +def p4Cmd(cmd): + list = p4CmdList(cmd) + result = {} + for entry in list: + result.update(entry) + return result; + +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") + elif "data" in output: + data = output.get("data") + lastSpace = data.rfind(" ") + clientPath = data[lastSpace + 1:] + + if clientPath.endswith("..."): + clientPath = clientPath[:-3] + return clientPath + +def currentGitBranch(): + 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")): + return True; + return False + +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 read_pipe_lines("git cat-file commit %s" % commit): + if not foundTitle: + if len(log) == 1: + foundTitle = True + continue + + logMessage += log + return logMessage + +def extractSettingsGitLog(log): + values = {} + for line in log.split("\n"): + line = line.strip() + 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") + if paths: + values['depot-paths'] = paths.split(',') + return values + +def gitBranchExists(branch): + 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() + +def findUpstreamBranchPoint(head = "HEAD"): + settings = None + branchPoint = "" + parent = 0 + while parent < 65535: + commit = head + "~%s" % parent + log = extractLogMessageFromGitCommit(commit) + settings = extractSettingsGitLog(log) + if not settings.has_key("depot-paths"): + parent = parent + 1 + continue + + names = read_pipe_lines("git name-rev \"--refs=refs/remotes/p4/*\" \"%s\"" % commit) + if len(names) <= 0: + continue + + # strip away the beginning of 'HEAD~42 refs/remotes/p4/foo' + branchPoint = names[0].strip()[len(commit) + 1:] + break + + return [branchPoint, settings] + +class Command: + def __init__(self): + self.usage = "usage: %prog [options]" + self.needsGit = True + +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 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) + settings = extractSettingsGitLog(log) + + 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 + + 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) + + + depotPaths = settings['depot-paths'] + change = settings['change'] + + if changed: + print "%s rewound to %s" % (ref, change) + + return True + +class P4Submit(Command): + def __init__(self): + 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("--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]" + self.firstTime = True + self.reset = False + self.interactive = True + self.dryRun = False + self.substFile = "" + self.firstTime = True + self.origin = "" + self.directSubmit = False + self.trustMeLikeAFool = False + self.verbose = False + self.isWindows = (platform.system() == "Windows") + + self.logSubstitutions = {} + self.logSubstitutions[""] = "%log%" + self.logSubstitutions["\tDetails:"] = "\tDetails: %log%" + + def check(self): + if len(p4CmdList("opened ...")) > 0: + die("You have files opened with perforce! Close them before starting the sync.") + + def start(self): + if len(self.config) > 0 and not self.reset: + 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 = [] + 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 + + def prepareLogMessage(self, template, message): + result = "" + + for line in template.split("\n"): + if line.startswith("#"): + result += line + "\n" + continue + + substituted = False + for key in self.logSubstitutions.keys(): + if line.find(key) != -1: + value = self.logSubstitutions[key] + value = value.replace("%log%", message) + if value != "@remove@": + result += line.replace(key, value) + "\n" + substituted = True + break + + if not substituted: + result += line + "\n" + + return result + + 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() + for line in diff: + modifier = line[0] + path = line[1:].strip() + if modifier == "M": + system("p4 edit \"%s\"" % path) + editedFiles.add(path) + elif modifier == "A": + filesToAdd.add(path) + if path in filesToDelete: + filesToDelete.remove(path) + elif modifier == "D": + filesToDelete.add(path) + if path in filesToAdd: + filesToAdd.remove(path) + else: + die("unknown modifier %s for %s" % (modifier, path)) + + 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(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) ") + if response == "s": + print "Skipping! Good luck with the next patches..." + return + elif response == "a": + 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") + 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") + + system(applyPatchCmd) + + for f in filesToAdd: + system("p4 add \"%s\"" % f) + for f in filesToDelete: + system("p4 revert \"%s\"" % f) + system("p4 delete \"%s\"" % f) + + logMessage = "" + if not self.directSubmit: + logMessage = extractLogMessageFromGitCommit(id) + logMessage = logMessage.replace("\n", "\n\t") + if self.isWindows: + logMessage = logMessage.replace("\n", "\r\n") + logMessage = logMessage.strip() + + template = read_pipe("p4 change -o") + + if self.interactive: + submitTemplate = self.prepareLogMessage(template, logMessage) + diff = read_pipe("p4 diff -du ...") + + for newFile in filesToAdd: + diff += "==== new file ====\n" + diff += "--- /dev/null\n" + diff += "+++ %s\n" % newFile + f = open(newFile, "r") + for line in f.readlines(): + diff += "+" + line + f.close() + + separatorLine = "######## everything below this line is just the diff #######" + if platform.system() == "Windows": + separatorLine += "\r" + separatorLine += "\n" + + response = "e" + if self.trustMeLikeAFool: + response = "y" + + firstIteration = True + while response == "e": + if not firstIteration: + response = raw_input("Do you want to submit this change? [y]es/[e]dit/[n]o/[s]kip ") + firstIteration = False + if response == "e": + [handle, fileName] = tempfile.mkstemp() + tmpFile = os.fdopen(handle, "w+") + tmpFile.write(submitTemplate + separatorLine + diff) + tmpFile.close() + defaultEditor = "vi" + if platform.system() == "Windows": + defaultEditor = "notepad" + editor = os.environ.get("EDITOR", defaultEditor); + system(editor + " " + fileName) + tmpFile = open(fileName, "rb") + message = tmpFile.read() + tmpFile.close() + os.remove(fileName) + submitTemplate = message[:message.index(separatorLine)] + if self.isWindows: + submitTemplate = submitTemplate.replace("\r\n", "\n") + + if response == "y" or response == "yes": + if self.dryRun: + print submitTemplate + raw_input("Press return to continue...") + else: + 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); + for f in filesToAdd: + system("p4 revert \"%s\"" % f); + system("rm %s" %f) + for f in filesToDelete: + system("p4 delete \"%s\"" % f); + return + else: + print "Not submitting!" + self.interactive = False + else: + fileName = "submit.txt" + 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)) + + def run(self, args): + if len(args) == 0: + self.master = currentGitBranch() + 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] + else: + return False + + [upstream, settings] = findUpstreamBranchPoint() + depotPath = settings['depot-paths'][0] + if len(self.origin) == 0: + self.origin = upstream + + if self.verbose: + print "Origin branch is " + self.origin + + if len(depotPath) == 0: + print "Internal error: cannot locate perforce depot path from existing branches" + sys.exit(128) + + self.clientPath = p4Where(depotPath) + + if len(self.clientPath) == 0: + print "Error: Cannot locate perforce checkout of %s in client view" % depotPath + sys.exit(128) + + print "Perforce checkout for depot path %s located at %s" % (depotPath, self.clientPath) + 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": + system("p4 sync ...") + + if self.reset: + self.firstTime = True + + if len(self.substFile) > 0: + for line in open(self.substFile, "r").readlines(): + tokens = line.strip().split("=") + self.logSubstitutions[tokens[0]] = tokens[1] + + self.check() + self.configFile = self.gitdir + "/p4-git-sync.cfg" + self.config = shelve.open(self.configFile, writeback=True) + + if self.firstTime: + self.start() + + commits = self.config.get("commits", []) + + while len(commits) > 0: + self.firstTime = False + commit = commits[0] + commits = commits[1:] + self.config["commits"] = commits + 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": + rebase = P4Rebase() + rebase.run([]) + os.remove(self.configFile) + + return True + +class P4Sync(Command): + def __init__(self): + Command.__init__(self) + self.options = [ + optparse.make_option("--branch", dest="branch"), + 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("--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: + //depot/my/project/ -- to import the current head + //depot/my/project/@all -- to import everything + //depot/my/project/@1,6 -- to import only from revision 1 to 6 + + (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() + 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 + self.p4BranchesInGit = [] + + 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] + + found = [p for p in self.depotPaths + if path.startswith (p)] + if not found: + fnum = fnum + 1 + continue + + file = {} + file["path"] = path + file["rev"] = commit["rev%s" % fnum] + file["action"] = commit["action%s" % fnum] + file["type"] = commit["type%s" % fnum] + files.append(file) + fnum = fnum + 1 + return files + + def stripRepoPath(self, path, prefixes): + if self.keepRepoPath: + prefixes = [re.sub("^(//[^/]+/).*", r'\1', prefixes[0])] + + for p in prefixes: + if path.startswith(p): + path = path[len(p):] + + return path + + 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 + + file = {} + file["path"] = path + file["rev"] = commit["rev%s" % fnum] + file["action"] = commit["action%s" % fnum] + file["type"] = commit["type%s" % fnum] + fnum = fnum + 1 + + relPath = self.stripRepoPath(path, self.depotPaths) + + for branch in self.knownBranches.keys(): + + # 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) + break + + return branches + + ## Should move this out, doesn't use SELF. + def readP4Files(self, files): + files = [f for f in files + if f['action'] != 'delete'] + + if not files: + return + + # We cannot put all the files on the command line + # OS have limitations on the max lenght of arguments + # POSIX says it's 4096 bytes, default for Linux seems to be 130 K. + # and all OS from the table below seems to be higher than POSIX. + # See http://www.in-ulm.de/~mascheck/various/argmax/ + argmax = min(4000, os.sysconf('SC_ARG_MAX')) + chunk = '' + filedata = [] + for i in xrange(len(files)): + f = files[i] + chunk += '"%s#%s" ' % (f['path'], f['rev']) + if len(chunk) > argmax or i == len(files)-1: + data = p4CmdList('print %s' % chunk) + if "p4ExitCode" in data[0]: + die("Problems executing p4. Error: [%d]." % (data[0]['p4ExitCode'])); + filedata.extend(data) + chunk = '' + + 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 + + + if not stat.has_key('depotFile'): + sys.stderr.write("p4 print fails with: %s\n" % repr(stat)) + continue + + contents[stat['depotFile']] = text + + for f in files: + assert not f.has_key('data') + f['data'] = contents[f['path']] + + 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"]) + 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: + committer = "%s %s %s" % (author, epoch, self.tz) + + self.gitStream.write("committer %s\n" % committer) + + self.gitStream.write("data < 0: + self.gitStream.write(": options = %s" % details['options']) + self.gitStream.write("]\nEOT\n\n") + + if len(parent) > 0: + if self.verbose: + print "parent %s" % parent + self.gitStream.write("from %s\n" % parent) + + for file in files: + if file["type"] == "apple": + print "\nfile %s is a strange apple file that forks. Ignoring!" % file['path'] + continue + + 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 = file['data'] + + if self.isWindows and file["type"].endswith("text"): + data = data.replace("\r\n", "\n") + + 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") + + self.gitStream.write("\n") + + change = int(details["change"]) + + 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 " + ' '.join (["%s...@%s" % (p, change) + for p in branchPrefixes])) + + if len(files) == len(labelRevisions): + + cleanedFiles = {} + for info in files: + if info["action"] == "delete": + continue + cleanedFiles[info["depotFile"]] = info["rev"] + + if cleanedFiles == labelRevisions: + self.gitStream.write("tag tag_%s\n" % labelDetails["label"]) + self.gitStream.write("from %s\n" % branch) + + owner = labelDetails["Owner"] + tagger = "" + if author in self.users: + tagger = "%s %s %s" % (self.users[owner], epoch, self.tz) + else: + tagger = "%s %s %s" % (owner, epoch, self.tz) + self.gitStream.write("tagger %s\n" % tagger) + self.gitStream.write("data <" + + + s = '' + for (key, val) in self.users.items(): + s += "%s\t%s\n" % (key, val) + + open(self.getUserCacheFilename(), "wb").write(s) + self.userMapFromPerforceServer = True + + 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() + + def getLabels(self): + self.labels = {} + + 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` + + 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 + + self.labels[newestChange] = [output, revisions] + + if self.verbose: + print "Label changes: %s" % self.labels.keys() + + def guessProjectName(self): + for p in self.depotPaths: + if p.endswith("/"): + p = p[:-1] + p = p[p.strip().rfind("/") + 1:] + if not p.endswith("/"): + p += "/" + return p + + def getBranchMapping(self): + lostAndFoundBranches = set() + + 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 in self.knownBranches: + if not self.silent: + print "p4 branch %s defines a mapping from %s to %s" % (info["branch"], source, destination) + print "but there exists another mapping from %s to %s already!" % (self.knownBranches[destination], destination) + continue + + self.knownBranches[destination] = source + + lostAndFoundBranches.discard(destination) + + if source not in self.knownBranches: + lostAndFoundBranches.add(source) + + + for branch in lostAndFoundBranches: + self.knownBranches[branch] = branch + + def listExistingP4GitBranches(self): + self.p4BranchesInGit = [] + + cmdline = "git rev-parse --symbolic " + if self.importIntoRemotes: + cmdline += " --remotes" + else: + cmdline += " --branches" + + for line in read_pipe_lines(cmdline): + line = line.strip() + + ## only import to p4/ + if not line.startswith('p4/') or line == "p4/HEAD": + continue + branch = line + + # 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) + + originPrefix = "origin/p4/" + + for line in read_pipe_lines("git rev-parse --symbolic --remotes"): + line = line.strip() + if (not line.startswith(originPrefix)) or line.endswith("HEAD"): + continue + + headName = line[len(originPrefix):] + remoteHead = self.refPrefix + headName + originHead = line + + original = extractSettingsGitLog(extractLogMessageFromGitCommit(originHead)) + if (not original.has_key('depot-paths') + or not original.has_key('change')): + continue + + 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']))) + + if update: + system("git update-ref %s %s" % (remoteHead, originHead)) + + def updateOptionDict(self, d): + option_keys = {} + if self.keepRepoPath: + option_keys['keepRepoPath'] = 1 + + 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.depotPaths = [] + self.changeRange = "" + self.initialParent = "" + self.previousDepotPaths = [] + + # map from branch depot path to parent branch + self.knownBranches = {} + self.initialParents = {} + self.hasOrigin = gitBranchExists("origin") or gitBranchExists("origin/p4") or gitBranchExists("origin/p4/master") + if not self.syncWithOrigin: + self.hasOrigin = False + + if self.importIntoRemotes: + self.refPrefix = "refs/remotes/p4/" + else: + self.refPrefix = "refs/heads/p4/" + + 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 + "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 "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) + + 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 + 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 + + if not self.branch.startswith("refs/"): + self.branch = "refs/heads/" + self.branch + + if len(args) == 0 and self.depotPaths: + if not self.silent: + print "Depot paths: %s" % ' '.join(self.depotPaths) + else: + 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.depotPaths = sorted(args) + + self.revision = "" + self.users = {} + + 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 self.detectBranches: + ## FIXME - what's a P4 projectName ? + self.projectName = self.guessProjectName() + + if not self.hasOrigin: + 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); + self.gitOutput = importProcess.stdout + self.gitStream = importProcess.stdin + self.gitError = importProcess.stderr + + if self.revision: + print "Doing initial import of %s from revision %s into %s" % (' '.join(self.depotPaths), self.revision, self.branch) + + details = { "user" : "git perforce import user", "time" : int(time.time()) } + 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 " + + ' '.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 + + if info["action"] == "delete": + # don't increase the file cnt, otherwise details["depotFile123"] will have gaps! + #fileCnt = fileCnt + 1 + continue + + 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.depotPaths) + except IOError: + print "IO error with git fast-import. Is your git version recent enough?" + print self.gitError.read() + + else: + changes = [] + + if len(self.changesFile) > 0: + output = open(self.changesFile).readlines() + changeSet = Set() + for line in output: + changeSet.add(int(line)) + + for change in changeSet: + changes.append(change) + + changes.sort() + else: + 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] + changes.append(changeNum) + + 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!" + return True + + if not self.silent and not self.detectBranches: + print "Import destination: %s" % self.branch + + 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.flush() + cnt = cnt + 1 + + try: + if self.detectBranches: + branches = self.splitFilesIntoBranches(description) + for branch in branches.keys(): + ## HACK --hwn + branchPrefix = self.depotPaths[0] + branch + "/" + + parent = "" + + filesForCommit = branches[branch] + + if self.verbose: + print "branch is %s" % branch + + self.updatedBranches.add(branch) + + if branch not in self.createdBranches: + self.createdBranches.add(branch) + parent = self.knownBranches[branch] + if parent == branch: + parent = "" + elif self.verbose: + print "parent determined through known branches: %s" % parent + + # main branch? use master + if branch == "main": + branch = "master" + else: + + ## FIXME + branch = self.projectName + branch + + if parent == "main": + parent = "master" + elif len(parent) > 0: + ## FIXME + parent = self.projectName + parent + + branch = self.refPrefix + branch + if len(parent) > 0: + parent = self.refPrefix + parent + + if self.verbose: + print "looking for initial parent for %s; current parent is %s" % (branch, parent) + + if len(parent) == 0 and branch in self.initialParents: + parent = self.initialParents[branch] + del self.initialParents[branch] + + self.commit(description, filesForCommit, branch, [branchPrefix], parent) + else: + files = self.extractFilesFromCommit(description) + self.commit(description, files, self.branch, self.depotPaths, + self.initialParent) + self.initialParent = "" + except IOError: + print self.gitError.read() + sys.exit(1) + + 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() + + return True + +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.verbose = False + + def run(self, args): + sync = P4Sync() + sync.run([]) + + [upstream, settings] = findUpstreamBranchPoint() + if len(upstream) == 0: + die("Cannot find upstream branchpoint for rebase") + + # the branchpoint may be p4/foo~3, so strip off the parent + upstream = re.sub("~[0-9]+$", "", upstream) + + print "Rebasing the current branch onto %s" % upstream + oldHead = read_pipe("git rev-parse HEAD").strip() + system("git rebase %s" % upstream) + system("git diff-tree --stat --summary -M %s HEAD" % oldHead) + return True + +class P4Clone(P4Sync): + def __init__(self): + P4Sync.__init__(self) + self.description = "Creates a new git repository and imports from Perforce into it" + self.usage = "usage: %prog [options] //depot/path[@revRange]" + self.options.append( + optparse.make_option("--destination", dest="cloneDestination", + action='store', default=None, + help="where to leave result of the clone")) + self.cloneDestination = None + self.needsGit = False + + def defaultDestination(self, args): + ## TODO: use common prefix of args? + depotPath = args[0] + depotDir = re.sub("(@[^@]*)$", "", depotPath) + depotDir = re.sub("(#[^#]*)$", "", depotDir) + depotDir = re.sub(r"\.\.\.$,", "", depotDir) + depotDir = re.sub(r"/$", "", depotDir) + return os.path.split(depotDir)[1] + + def run(self, args): + if len(args) < 1: + return False + + if self.keepRepoPath and not self.cloneDestination: + sys.stderr.write("Must specify destination for --keep-path\n") + sys.exit(1) + + depotPaths = args + + if not self.cloneDestination and len(depotPaths) > 1: + self.cloneDestination = depotPaths[-1] + depotPaths = depotPaths[:-1] + + for p in depotPaths: + if not p.startswith("//"): + return False + + if not self.cloneDestination: + self.cloneDestination = self.defaultDestination(args) + + print "Importing from %s into %s" % (', '.join(depotPaths), self.cloneDestination) + if not os.path.exists(self.cloneDestination): + os.makedirs(self.cloneDestination) + os.chdir(self.cloneDestination) + system("git init") + self.gitdir = os.getcwd() + "/.git" + if not P4Sync.run(self, depotPaths): + return False + if self.branch != "master": + 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 P4Branches(Command): + def __init__(self): + Command.__init__(self) + self.options = [ ] + self.description = ("Shows the git branches that hold imports and their " + + "corresponding perforce depot paths") + self.verbose = False + + def run(self, args): + cmdline = "git rev-parse --symbolic " + cmdline += " --remotes" + + for line in read_pipe_lines(cmdline): + line = line.strip() + + if not line.startswith('p4/') or line == "p4/HEAD": + continue + branch = line + + log = extractLogMessageFromGitCommit("refs/remotes/%s" % branch) + settings = extractSettingsGitLog(log) + + print "%s <= %s (%s)" % (branch, ",".join(settings["depot-paths"]), settings["change"]) + return True + +class HelpFormatter(optparse.IndentedHelpFormatter): + def __init__(self): + optparse.IndentedHelpFormatter.__init__(self) + + def format_description(self, description): + if description: + return description + "\n" + else: + return "" + +def printUsage(commands): + print "usage: %s [options]" % sys.argv[0] + print "" + print "valid commands: %s" % ", ".join(commands) + print "" + print "Try %s --help for command specific help." % sys.argv[0] + print "" + +commands = { + "debug" : P4Debug, + "submit" : P4Submit, + "sync" : P4Sync, + "rebase" : P4Rebase, + "clone" : P4Clone, + "rollback" : P4RollBack, + "branches" : P4Branches +} + + +def main(): + if len(sys.argv[1:]) == 0: + printUsage(commands.keys()) + sys.exit(2) + + 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) + + os.environ["GIT_DIR"] = cmd.gitdir + + if not cmd.run(args): + parser.print_help() + + +if __name__ == '__main__': + main() diff --git a/contrib/fast-import/git-p4.bat b/contrib/fast-import/git-p4.bat new file mode 100644 index 0000000000000000000000000000000000000000..9f97e884f5c3cae9e89164c9590959ba487a89bd --- /dev/null +++ b/contrib/fast-import/git-p4.bat @@ -0,0 +1 @@ +@python "%~d0%~p0git-p4" %* diff --git a/contrib/fast-import/git-p4.txt b/contrib/fast-import/git-p4.txt new file mode 100644 index 0000000000000000000000000000000000000000..b16a8384bcfbfe33dc33e1076c64f5d36e75e803 --- /dev/null +++ b/contrib/fast-import/git-p4.txt @@ -0,0 +1,159 @@ +git-p4 - Perforce <-> Git converter using git-fast-import + +Usage +===== + +git-p4 supports two main modes: Importing from Perforce to a Git repository is +done using "git-p4 sync" or "git-p4 rebase". Submitting changes from Git back +to Perforce is done using "git-p4 submit". + +Importing +========= + +You can simply start with + + git-p4 clone //depot/path/project + +or + + git-p4 clone //depot/path/project myproject + +This will create an empty git repository in a subdirectory called "project" (or +"myproject" with the second command), import the head revision from the +specified perforce path into a git "p4" branch (remotes/p4 actually), create a +master branch off it and check it out. If you want the entire history (not just +the head revision) then you can simply append a "@all" to the depot path: + + git-p4 clone //depot/project/main@all myproject + + + +If you want more control you can also use the git-p4 sync command directly: + + mkdir repo-git + cd repo-git + git init + git-p4 sync //path/in/your/perforce/depot + +This will import the current head revision of the specified depot path into a +"remotes/p4/master" branch of your git repository. You can use the +--branch=mybranch option to use a different branch. + +If you want to import the entire history of a given depot path just use + + git-p4 sync //path/in/depot@all + +To achieve optimal compression you may want to run 'git repack -a -d -f' after +a big import. This may take a while. + +Support for Perforce integrations is still work in progress. Don't bother +trying it unless you want to hack on it :) + +Incremental Imports +=================== + +After an initial import you can easily synchronize your git repository with +newer changes from the Perforce depot by just calling + + git-p4 sync + +in your git repository. By default the "remotes/p4/master" branch is updated. + +It is recommended to run 'git repack -a -d -f' from time to time when using +incremental imports to optimally combine the individual git packs that each +incremental import creates through the use of git-fast-import. + + +A useful setup may be that you have a periodically updated git repository +somewhere that contains a complete import of a Perforce project. That git +repository can be used to clone the working repository from and one would +import from Perforce directly after cloning using git-p4. If the connection to +the Perforce server is slow and the working repository hasn't been synced for a +while it may be desirable to fetch changes from the origin git repository using +the efficient git protocol. git-p4 supports this setup by calling "git fetch origin" +by default if there is an origin branch. You can disable this using + + git config git-p4.syncFromOrigin false + +Updating +======== + +A common working pattern is to fetch the latest changes from the Perforce depot +and merge them with local uncommitted changes. The recommended way is to use +git's rebase mechanism to preserve linear history. git-p4 provides a convenient + + git-p4 rebase + +command that calls git-p4 sync followed by git rebase to rebase the current +working branch. + +Submitting +========== + +git-p4 has support for submitting changes from a git repository back to the +Perforce depot. This requires a Perforce checkout separate to your git +repository. To submit all changes that are in the current git branch but not in +the "p4" branch (or "origin" if "p4" doesn't exist) simply call + + git-p4 submit + +in your git repository. If you want to submit changes in a specific branch that +is not your current git branch you can also pass that as an argument: + + git-p4 submit mytopicbranch + +You can override the reference branch with the --origin=mysourcebranch option. + +If a submit fails you may have to "p4 resolve" and submit manually. You can +continue importing the remaining changes with + + git-p4 submit --continue + +After submitting you should sync your perforce import branch ("p4" or "origin") +from Perforce using git-p4's sync command. + +If you have changes in your working directory that you haven't committed into +git yet but that you want to commit to Perforce directly ("quick fixes") then +you do not have to go through the intermediate step of creating a git commit +first but you can just call + + git-p4 submit --direct + + +Example +======= + +# Clone a repository + git-p4 clone //depot/path/project +# Enter the newly cloned directory + cd project +# Do some work... + vi foo.h +# ... and commit locally to gi + git commit foo.h +# In the meantime somebody submitted changes to the Perforce depot. Rebase your latest +# changes against the latest changes in Perforce: + git-p4 rebase +# Submit your locally committed changes back to Perforce + git-p4 submit +# ... and synchronize with Perforce + git-p4 rebase + + +Implementation Details... +========================= + +* Changesets from Perforce are imported using git fast-import. +* The import does not require anything from the Perforce client view as it just uses + "p4 print //depot/path/file#revision" to get the actual file contents. +* Every imported changeset has a special [git-p4...] line at the + end of the log message that gives information about the corresponding + Perforce change number and is also used by git-p4 itself to find out + where to continue importing when doing incremental imports. + Basically when syncing it extracts the perforce change number of the + latest commit in the "p4" branch and uses "p4 changes //depot/path/...@changenum,#head" + to find out which changes need to be imported. +* git-p4 submit uses "git rev-list" to pick the commits between the "p4" branch + and the current branch. + The commits themselves are applied using git diff/format-patch ... | git apply +