receive-pack: allow deletion of corrupt refs

diff --git a/fast-import.c b/fast-import.c
index f93d7d6c9bf2db021ceb65766da87af32aecc1d1..98c2bd535957a45e5ef189875859d4788d937e7e 100644 (file)
--- a/fast-import.c
+++ b/fast-import.c
@@ -153,13 +153,16 @@ Format of STDIN stream:
 
 #define PACK_ID_BITS 16
 #define MAX_PACK_ID ((1<<PACK_ID_BITS)-1)
+#define DEPTH_BITS 13
+#define MAX_DEPTH ((1<<DEPTH_BITS)-1)
 
 struct object_entry
 {
        struct object_entry *next;
        uint32_t offset;
-       unsigned type : TYPE_BITS;
-       unsigned pack_id : PACK_ID_BITS;
+       uint32_t type : TYPE_BITS,
+               pack_id : PACK_ID_BITS,
+               depth : DEPTH_BITS;
        unsigned char sha1[20];
 };
 
@@ -1083,7 +1086,7 @@ static int store_object(
                unsigned pos = sizeof(hdr) - 1;
 
                delta_count_by_type[type]++;
-               last->depth++;
+               e->depth = last->depth + 1;
 
                hdrlen = encode_header(OBJ_OFS_DELTA, deltalen, hdr);
                write_or_die(pack_data->pack_fd, hdr, hdrlen);
@@ -1095,8 +1098,7 @@ static int store_object(
                write_or_die(pack_data->pack_fd, hdr + pos, sizeof(hdr) - pos);
                pack_size += sizeof(hdr) - pos;
        } else {
-               if (last)
-                       last->depth = 0;
+               e->depth = 0;
                hdrlen = encode_header(type, dat->len, hdr);
                write_or_die(pack_data->pack_fd, hdr, hdrlen);
                pack_size += hdrlen;
@@ -1114,6 +1116,7 @@ static int store_object(
                        strbuf_swap(&last->data, dat);
                }
                last->offset = e->offset;
+               last->depth = e->depth;
        }
        return 0;
 }
@@ -1160,7 +1163,7 @@ static void load_tree(struct tree_entry *root)
        if (myoe && myoe->pack_id != MAX_PACK_ID) {
                if (myoe->type != OBJ_TREE)
                        die("Not a tree: %s", sha1_to_hex(sha1));
-               t->delta_depth = 0;
+               t->delta_depth = myoe->depth;
                buf = gfi_unpack_entry(myoe, &size);
        } else {
                enum object_type type;
@@ -2289,8 +2292,11 @@ int main(int argc, const char **argv)
                }
                else if (!prefixcmp(a, "--max-pack-size="))
                        max_packsize = strtoumax(a + 16, NULL, 0) * 1024 * 1024;
-               else if (!prefixcmp(a, "--depth="))
+               else if (!prefixcmp(a, "--depth=")) {
                        max_depth = strtoul(a + 8, NULL, 0);
+                       if (max_depth > MAX_DEPTH)
+                               die("--depth cannot exceed %u", MAX_DEPTH);
+               }
                else if (!prefixcmp(a, "--active-branches="))
                        max_active_branches = strtoul(a + 18, NULL, 0);
                else if (!prefixcmp(a, "--import-marks="))