git-p4: add option to disable syncing of p4/master with p4

Add an option to the git-p4 submit command to disable syncing
with Perforce.

This is useful for the case where a git-p4 mirror has been setup
on a server somewhere, running from (e.g.) cron, and developers
then clone from this. Having the local cloned copy also sync
from Perforce just isn't useful.

Signed-off-by: Luke Diamand <luke@diamand.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-p4.txt

@@ -344,6 +344,11 @@ These options can be used to modify 'git p4 submit' behavior.
     Disable the automatic rebase after all commits have been successfully
     submitted. Can also be set with git-p4.disableRebase.
 
+--disable-p4sync::
+    Disable the automatic sync of p4/master from Perforce after commits have
+    been submitted. Implies --disable-rebase. Can also be set with
+    git-p4.disableP4Sync. Sync with origin/master still goes ahead if possible.
+
 Rebase options
 ~~~~~~~~~~~~~~
 These options can be used to modify 'git p4 rebase' behavior.
@@ -661,6 +666,9 @@ git-p4.conflict::
 git-p4.disableRebase::
     Do not rebase the tree against p4/master following a submit.
 
+git-p4.disableP4Sync::
+    Do not sync p4/master with Perforce following a submit. Implies git-p4.disableRebase.
+
 IMPLEMENTATION DETAILS
 ----------------------
 * Changesets from p4 are imported using Git fast-import.

git-p4.py

@@ -1357,7 +1357,9 @@ def __init__(self):
                                      help="submit only the specified commit(s), one commit or xxx..xxx"),
                 optparse.make_option("--disable-rebase", dest="disable_rebase", action="store_true",
                                      help="Disable rebase after submit is completed. Can be useful if you "
-                                     "work from a local git branch that is not master")
+                                     "work from a local git branch that is not master"),
+                optparse.make_option("--disable-p4sync", dest="disable_p4sync", action="store_true",
+                                     help="Skip Perforce sync of p4/master after submit or shelve"),
         ]
         self.description = "Submit changes from git to the perforce depot."
         self.usage += " [name of git branch to submit into perforce depot]"
@@ -1369,6 +1371,7 @@ def __init__(self):
         self.update_shelve = list()
         self.commit = ""
         self.disable_rebase = gitConfigBool("git-p4.disableRebase")
+        self.disable_p4sync = gitConfigBool("git-p4.disableP4Sync")
         self.prepare_p4_only = False
         self.conflict_behavior = None
         self.isWindows = (platform.system() == "Windows")
@@ -2229,11 +2232,14 @@ def run(self, args):
             sync = P4Sync()
             if self.branch:
                 sync.branch = self.branch
-            sync.run([])
+            if self.disable_p4sync:
+                sync.sync_origin_only()
+            else:
+                sync.run([])
 
-            if self.disable_rebase is False:
+                if not self.disable_rebase:
-                rebase = P4Rebase()
+                    rebase = P4Rebase()
-                rebase.rebase()
+                    rebase.rebase()
 
         else:
             if len(applied) == 0:
@@ -3261,6 +3267,14 @@ def importChanges(self, changes):
                 print self.gitError.read()
                 sys.exit(1)
 
+    def sync_origin_only(self):
+        if self.syncWithOrigin:
+            self.hasOrigin = originP4BranchesExist()
+            if self.hasOrigin:
+                if not self.silent:
+                    print 'Syncing with origin first, using "git fetch origin"'
+                system("git fetch origin")
+
     def importHeadRevision(self, revision):
         print "Doing initial import of %s from revision %s into %s" % (' '.join(self.depotPaths), revision, self.branch)
 
@@ -3333,12 +3347,7 @@ def run(self, args):
         else:
             self.refPrefix = "refs/heads/p4/"
 
-        if self.syncWithOrigin:
+        self.sync_origin_only()
-            self.hasOrigin = originP4BranchesExist()
-            if self.hasOrigin:
-                if not self.silent:
-                    print 'Syncing with origin first, using "git fetch origin"'
-                system("git fetch origin")
 
         branch_arg_given = bool(self.branch)
         if len(self.branch) == 0: