allow forcing index v2 and 64-bit offset treshold

diff --git a/index-pack.c b/index-pack.c
index a833f640f6bb4e9eb2b876b65644b410b426dbb0..7aad261d485f209f7459362dbe5a7cf5f6a9cf42 100644 (file)
--- a/index-pack.c
+++ b/index-pack.c
@@ -671,6 +671,9 @@ static void readjust_pack_header_and_sha1(unsigned char *sha1)
        write_or_die(output_fd, sha1, 20);
 }
 
+static uint32_t index_default_version = 1;
+static uint32_t index_off32_limit = 0x7fffffff;
+
 static int sha1_compare(const void *_a, const void *_b)
 {
        struct object_entry *a = *(struct object_entry **)_a;
@@ -719,7 +722,7 @@ static const char *write_index_file(const char *index_name, unsigned char *sha1)
        f = sha1fd(fd, index_name);
 
        /* if last object's offset is >= 2^31 we should use index V2 */
-       index_version = (objects[nr_objects-1].offset >> 31) ? 2 : 1;
+       index_version = (objects[nr_objects-1].offset >> 31) ? 2 : index_default_version;
 
        /* index versions 2 and above need a header */
        if (index_version >= 2) {
@@ -779,7 +782,7 @@ static const char *write_index_file(const char *index_name, unsigned char *sha1)
                list = sorted_by_sha;
                for (i = 0; i < nr_objects; i++) {
                        struct object_entry *obj = *list++;
-                       uint32_t offset = (obj->offset <= 0x7fffffff) ?
+                       uint32_t offset = (obj->offset <= index_off32_limit) ?
                                obj->offset : (0x80000000 | nr_large_offset++);
                        offset = htonl(offset);
                        sha1write(f, &offset, 4);
@@ -790,7 +793,7 @@ static const char *write_index_file(const char *index_name, unsigned char *sha1)
                while (nr_large_offset) {
                        struct object_entry *obj = *list++;
                        uint64_t offset = obj->offset;
-                       if (offset > 0x7fffffff) {
+                       if (offset > index_off32_limit) {
                                uint32_t split[2];
                                split[0]        = htonl(offset >> 32);
                                split[1] = htonl(offset & 0xffffffff);
@@ -929,6 +932,15 @@ int main(int argc, char **argv)
                                if (index_name || (i+1) >= argc)
                                        usage(index_pack_usage);
                                index_name = argv[++i];
+                       } else if (!prefixcmp(arg, "--index-version=")) {
+                               char *c;
+                               index_default_version = strtoul(arg + 16, &c, 10);
+                               if (index_default_version > 2)
+                                       die("bad %s", arg);
+                               if (*c == ',')
+                                       index_off32_limit = strtoul(c+1, &c, 0);
+                               if (*c || index_off32_limit & 0x80000000)
+                                       die("bad %s", arg);
                        } else
                                usage(index_pack_usage);
                        continue;