Add "--incremental" flag to git-pack-objects

It won't add an object that is already in a pack to the new pack.

diff --git a/pack-objects.c b/pack-objects.c
index d95f45e..780418d 100644 (file)
--- a/pack-objects.c
+++ b/pack-objects.c
@@ -5,7 +5,7 @@
 #include "pack.h"
 #include "csum-file.h"
 
-static const char pack_usage[] = "git-pack-objects [--window=N] [--depth=N] {--stdout | base-name} < object-list";
+static const char pack_usage[] = "git-pack-objects [--incremental] [--window=N] [--depth=N] {--stdout | base-name} < object-list";
 
 struct object_entry {
        unsigned char sha1[20];
@@ -18,6 +18,7 @@ struct object_entry {
        struct object_entry *delta;
 };
 
+static int incremental = 0;
 static struct object_entry **sorted_by_sha, **sorted_by_type;
 static struct object_entry *objects = NULL;
 static int nr_objects = 0, nr_alloc = 0;
@@ -192,6 +193,9 @@ static void add_object_entry(unsigned char *sha1, unsigned int hash)
        unsigned int idx = nr_objects;
        struct object_entry *entry;
 
+       if (incremental && has_sha1_pack(sha1))
+               return;
+
        if (idx >= nr_alloc) {
                unsigned int needed = (idx + 1024) * 3 / 2;
                objects = xrealloc(objects, needed * sizeof(*entry));
@@ -387,6 +391,10 @@ int main(int argc, char **argv)
                const char *arg = argv[i];
 
                if (*arg == '-') {
+                       if (!strcmp("--incremental", arg)) {
+                               incremental = 1;
+                               continue;
+                       }
                        if (!strncmp("--window=", arg, 9)) {
                                char *end;
                                window = strtoul(arg+9, &end, 0);