Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx> writes:
> @@ -1570,7 +1576,7 @@ static void drop_reused_delta(struct object_entry *entry)
> entry->depth = 0;
>
> oi.sizep = &entry->size;
> - oi.typep = &entry->type;
> + oi.typep = &type;
> if (packed_object_info(entry->in_pack, entry->in_pack_offset, &oi) < 0) {
> /*
> * We failed to get the info from this pack for some reason;
> @@ -1580,6 +1586,10 @@ static void drop_reused_delta(struct object_entry *entry)
> */
> entry->type = sha1_object_info(entry->idx.oid.hash,
> &entry->size);
The comment immediately before this pre-context reads as such:
/*
* We failed to get the info from this pack for some reason;
* fall back to sha1_object_info, which may find another copy.
* And if that fails, the error will be recorded in entry->type
* and dealt with in prepare_pack().
*/
The rest of the code relies on the ability of entry->type to record
the error by storing an invalid (negative) type; otherwise, it cannot
detect an error where (1) the entry in _this_ pack was corrupt, and
(2) we wished to find another copy of the object elsewhere (which
would overwrite the negative entry->type we assign here), but we
didn't find any.
How should we propagate the error we found here down the control
flow in this new code?
> + } else {
> + if (type < 0)
> + die("BUG: invalid type %d", type);
> + entry->type = type;
The BUG() on this side is sensible, as packed_object_info()
shouldn't report success when it stored negative result in *oi.typep
anyway.
> unsigned char in_pack_header_size;
> + unsigned type:TYPE_BITS;
> + unsigned in_pack_type:TYPE_BITS; /* could be delta */
