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midx: replace get_midx_rev_filename() with a generic helper

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Commit f894081dea (pack-revindex: read multi-pack reverse indexes,
2021-03-30) introduced the `get_midx_rev_filename()` helper (later
modified by commit 60980aed78 (midx.c: write MIDX filenames to
strbuf, 2021-10-26)).

This function returns the location of the classic ".rev" files we used
to write for MIDXs (prior to 95e8383bac (midx.c: make changing the
preferred pack safe, 2022-01-25)), which is always of the form:

    $GIT_DIR/objects/pack/multi-pack-index-$HASH.rev

Replace this function with a generic helper that populates a strbuf with
the above form, replacing the ".rev" extension with a caller-provided
argument.

This will allow us to remove a similarly-defined function in the
pack-bitmap code (used to determine the location of a MIDX .bitmap file)
by reimplementing it in terms of `get_midx_filename_ext()`.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Taylor Blau
2024-05-29 18:55:42 -04:00
committed by Junio C Hamano
parent d6a8c58675
commit defba632c1
3 changed files with 13 additions and 6 deletions
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10
midx.c
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@@ -25,13 +25,15 @@ const unsigned char *get_midx_checksum(struct multi_pack_index *m)
void get_midx_filename(struct strbuf *out, const char *object_dir)
{
strbuf_addf(out, "%s/pack/multi-pack-index", object_dir);
get_midx_filename_ext(out, object_dir, NULL, NULL);
}
void get_midx_rev_filename(struct strbuf *out, struct multi_pack_index *m)
void get_midx_filename_ext(struct strbuf *out, const char *object_dir,
const unsigned char *hash, const char *ext)
{
get_midx_filename(out, m->object_dir);
strbuf_addf(out, "-%s.rev", hash_to_hex(get_midx_checksum(m)));
strbuf_addf(out, "%s/pack/multi-pack-index", object_dir);
if (ext)
strbuf_addf(out, "-%s.%s", hash_to_hex(hash), ext);
}
static int midx_read_oid_fanout(const unsigned char *chunk_start,