Derrick Stolee <stolee@xxxxxxxxx> writes:
> +#define MIDX_SIGNATURE 0x4d494458 /* "MIDX" */
> +#define MIDX_VERSION 1
> +#define MIDX_HASH_VERSION 1
> +#define MIDX_HEADER_SIZE 12
> +
> +static char *get_midx_filename(const char *object_dir)
> +{
> + return xstrfmt("%s/pack/multi-pack-index", object_dir);
> +}
> +
> +static size_t write_midx_header(struct hashfile *f,
> + unsigned char num_chunks,
> + uint32_t num_packs)
> +{
> + unsigned char byte_values[4];
> + hashwrite_be32(f, MIDX_SIGNATURE);
WARNING: Missing a blank line after declarations
#48: FILE: midx.c:21:
+ unsigned char byte_values[4];
+ hashwrite_be32(f, MIDX_SIGNATURE);
> + byte_values[0] = MIDX_VERSION;
> + byte_values[1] = MIDX_HASH_VERSION;
> + byte_values[2] = num_chunks;
> + byte_values[3] = 0; /* unused */
> + hashwrite(f, byte_values, sizeof(byte_values));
> + hashwrite_be32(f, num_packs);
> +
> + return MIDX_HEADER_SIZE;
> +}
> +
> int write_midx_file(const char *object_dir)
> {
> + unsigned char num_chunks = 0;
> + char *midx_name;
> + struct hashfile *f;
> + struct lock_file lk;
> +
> + midx_name = get_midx_filename(object_dir);
> + if (safe_create_leading_directories(midx_name)) {
> + UNLEAK(midx_name);
> + die_errno(_("unable to create leading directories of %s"),
> + midx_name);
> + }
> +
> + hold_lock_file_for_update(&lk, midx_name, LOCK_DIE_ON_ERROR);
> + f = hashfd(lk.tempfile->fd, lk.tempfile->filename.buf);
> + FREE_AND_NULL(midx_name);
I am not sure why people prefer FREE_AND_NULL over free() for things
like this. It is on stack; it's not like this is a static variable
visible after this function returns or anything like that.
> + write_midx_header(f, num_chunks, 0);
> +
> + finalize_hashfile(f, NULL, CSUM_FSYNC | CSUM_HASH_IN_STREAM);
> + commit_lock_file(&lk);
> +
> return 0;
> }
> diff --git a/t/t5319-multi-pack-index.sh b/t/t5319-multi-pack-index.sh
> index ec3ddbe79c..8622a7cdce 100755
> --- a/t/t5319-multi-pack-index.sh
> +++ b/t/t5319-multi-pack-index.sh
> @@ -4,7 +4,8 @@ test_description='multi-pack-indexes'
> . ./test-lib.sh
>
> test_expect_success 'write midx with no packs' '
> - git multi-pack-index --object-dir=. write
> + git multi-pack-index --object-dir=. write &&
> + test_path_is_file pack/multi-pack-index
> '
>
> test_done
