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midx: implement midx_locate_pack()

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The multi-pack index API exposes a `midx_contains_pack()` function that
takes in a string ending in either ".idx" or ".pack" and returns whether
or not the MIDX contains a given pack corresponding to that string.

There is no corresponding function to locate the position of a pack
within the MIDX's pack order (sorted lexically by pack filename).

We could add an optional out parameter to `midx_contains_pack()` that is
filled out with the pack's position when the parameter is non-NULL. To
minimize the amount of fallout from this change, instead introduce a new
function by renaming `midx_contains_pack()` to `midx_locate_pack()`,
adding that output parameter, and then reimplementing
`midx_contains_pack()` in terms of it.

Future patches will make use of this new function.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Taylor Blau
2023-12-14 17:23:54 -05:00
committed by Junio C Hamano
parent 5f5ccd9595
commit 307d75bbe6
2 changed files with 15 additions and 3 deletions
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5
midx.h
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@@ -70,7 +70,10 @@ struct object_id *nth_midxed_object_oid(struct object_id *oid,
struct multi_pack_index *m,
uint32_t n);
int fill_midx_entry(struct repository *r, const struct object_id *oid, struct pack_entry *e, struct multi_pack_index *m);
int midx_contains_pack(struct multi_pack_index *m, const char *idx_or_pack_name);
int midx_contains_pack(struct multi_pack_index *m,
const char *idx_or_pack_name);
int midx_locate_pack(struct multi_pack_index *m, const char *idx_or_pack_name,
uint32_t *pos);
int prepare_multi_pack_index_one(struct repository *r, const char *object_dir, int local);
/*