Add pack.depth option to git-pack-objects.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Junio C Hamano <junkio@cox.net>

Documentation/config.txt

@@ -546,6 +546,10 @@ pack.window::
 	The size of the window used by gitlink:git-pack-objects[1] when no
 	window size is given on the command line. Defaults to 10.
 
+pack.depth::
+	The maximum delta depth used by gitlink:git-pack-objects[1] when no
+	maximum depth is given on the command line. Defaults to 10.
+
 pull.octopus::
 	The default merge strategy to use when pulling multiple branches
 	at once.

Documentation/git-pack-objects.txt

@@ -83,7 +83,7 @@ base-name::
 	it too deep affects the performance on the unpacker
 	side, because delta data needs to be applied that many
 	times to get to the necessary object.
-	The default value for both --window and --depth is 10.
+	The default value for --window is 10 and --depth is 10.
 
 --incremental::
 	This flag causes an object already in a pack ignored

Documentation/git-repack.txt

@@ -63,7 +63,7 @@ OPTIONS
 	space. `--depth` limits the maximum delta depth; making it too deep
 	affects the performance on the unpacker side, because delta data needs
 	to be applied that many times to get to the necessary object.
-	The default value for both --window and --depth is 10.
+	The default value for --window is 10 and --depth is 10.
 
 
 Configuration

builtin-pack-objects.c

@@ -64,6 +64,7 @@ static char tmpname[PATH_MAX];
 static unsigned char pack_file_sha1[20];
 static int progress = 1;
 static int window = 10;
+static int depth = 10;
 static int pack_to_stdout;
 static int num_preferred_base;
 static struct progress progress_state;
@@ -1489,6 +1490,10 @@ static int git_pack_config(const char *k, const char *v)
 		window = git_config_int(k, v);
 		return 0;
 	}
+	if(!strcmp(k, "pack.depth")) {
+		depth = git_config_int(k, v);
+		return 0;
+	}
 	return git_default_config(k, v);
 }
 
@@ -1584,7 +1589,6 @@ static int adjust_perm(const char *path, mode_t mode)
 
 int cmd_pack_objects(int argc, const char **argv, const char *prefix)
 {
-	int depth = 10;
 	int use_internal_rev_list = 0;
 	int thin = 0;
 	uint32_t i;