git-p4: set useClientSpec variable on initial clone

If --use-client-spec was given, set the matching configuration
variable.  This is necessary to ensure that future submits
work properly.

The alternatives of requiring the user to set it, or providing
a command-line option on every submit, are error prone.

Signed-off-by: Pete Wyckoff <pw@padd.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-p4.txt

@@ -303,9 +303,13 @@ CLIENT SPEC
 -----------
 The p4 client specification is maintained with the 'p4 client' command
 and contains among other fields, a View that specifies how the depot
-is mapped into the client repository.  Git-p4 can consult the client
+is mapped into the client repository.  The 'clone' and 'sync' commands
-spec when given the '--use-client-spec' option or useClientSpec
+can consult the client spec when given the '--use-client-spec' option or
-variable.
+when the useClientSpec variable is true.  After 'git p4 clone', the
+useClientSpec variable is automatically set in the repository
+configuration file.  This allows future 'git p4 submit' commands to
+work properly; the submit command looks only at the variable and does
+not have a command-line option.
 
 The full syntax for a p4 view is documented in 'p4 help views'.  Git-p4
 knows only a subset of the view syntax.  It understands multi-line

contrib/fast-import/git-p4

@@ -1428,6 +1428,7 @@ class P4Sync(Command, P4UserMap):
         self.p4BranchesInGit = []
         self.cloneExclude = []
         self.useClientSpec = False
+        self.useClientSpec_from_options = False
         self.clientSpecDirs = None
 
         if gitConfig("git-p4.syncFromOrigin") == "false":
@@ -2136,7 +2137,11 @@ class P4Sync(Command, P4UserMap):
             if not gitBranchExists(self.refPrefix + "HEAD") and self.importIntoRemotes and gitBranchExists(self.branch):
                 system("git symbolic-ref %sHEAD %s" % (self.refPrefix, self.branch))
 
-        if not self.useClientSpec:
+        # accept either the command-line option, or the configuration variable
+        if self.useClientSpec:
+            # will use this after clone to set the variable
+            self.useClientSpec_from_options = True
+        else:
             if gitConfig("git-p4.useclientspec", "--bool") == "true":
                 self.useClientSpec = True
         if self.useClientSpec:
@@ -2455,6 +2460,10 @@ class P4Clone(P4Sync):
             else:
                 print "Could not detect main branch. No checkout/master branch created."
 
+        # auto-set this variable if invoked with --use-client-spec
+        if self.useClientSpec_from_options:
+            system("git config --bool git-p4.useclientspec true")
+
         return True
 
 class P4Branches(Command):

t/t9809-git-p4-client-view.sh

@@ -240,6 +240,23 @@ test_expect_success 'quotes on rhs only' '
 	git_verify "cdir 1/file11" "cdir 1/file12"
 '
 
+#
+# Submit tests
+#
+
+# clone sets variable
+test_expect_success 'clone --use-client-spec sets useClientSpec' '
+	client_view "//depot/... //client/..." &&
+	test_when_finished cleanup_git &&
+	"$GITP4" clone --use-client-spec --dest="$git" //depot &&
+	(
+		cd "$git" &&
+		git config --bool git-p4.useClientSpec >actual &&
+		echo true >true &&
+		test_cmp actual true
+	)
+'
+
 #
 # Rename directories to test quoting in depot-side mappings
 # //depot