Re: [PATCH 06/24] Convert check_connected to use struct object_id

[Stefan Beller <sbeller@google.com>]

On Sun, Oct 1, 2017 at 3:08 PM, brian m. carlson
<sandals@crustytoothpaste.net> wrote:
> Convert check_connected and the callbacks it takes to use struct
> object_id.
>

> diff --git a/connected.c b/connected.c
> index f416b05051..4a47f33270 100644
> --- a/connected.c
> +++ b/connected.c
> @@ -16,13 +16,13 @@
>   *
>   * Returns 0 if everything is connected, non-zero otherwise.
>   */
> -int check_connected(sha1_iterate_fn fn, void *cb_data,
> +int check_connected(oid_iterate_fn fn, void *cb_data,
>                     struct check_connected_options *opt)
>  {
>         struct child_process rev_list = CHILD_PROCESS_INIT;
>         struct check_connected_options defaults = CHECK_CONNECTED_INIT;
> -       char commit[41];
> -       unsigned char sha1[20];
> +       char commit[GIT_MAX_HEXSZ + 1];
> +       struct object_id oid;
>         int err = 0;
>         struct packed_git *new_pack = NULL;
>         struct transport *transport;

> @@ -77,7 +77,7 @@ int check_connected(sha1_iterate_fn fn, void *cb_data,
>
>         sigchain_push(SIGPIPE, SIG_IGN);
>
> -       commit[40] = '\n';
> +       commit[GIT_SHA1_HEXSZ] = '\n';

While we are using SHA1, this and below is correctly using
GIT_SHA1_HEXSZ, but the array is defined as GIT_MAX_HEXSZ.

Upon switching the hash function, we would plug in the
GIT_NEWHASH_HEXSZ here, or if we do it dynamically
(using a vtable for hash functions, to switch at run time)
we'd need to make the decision based on the hash function.

Makes sense.

>         do {
>                 /*
>                  * If index-pack already checked that:
> @@ -87,17 +87,17 @@ int check_connected(sha1_iterate_fn fn, void *cb_data,
>                  * are sure the ref is good and not sending it to
>                  * rev-list for verification.
>                  */
> -               if (new_pack && find_pack_entry_one(sha1, new_pack))
> +               if (new_pack && find_pack_entry_one(oid.hash, new_pack))
>                         continue;
>
> -               memcpy(commit, sha1_to_hex(sha1), 40);
> -               if (write_in_full(rev_list.in, commit, 41) < 0) {
> +               memcpy(commit, oid_to_hex(&oid), GIT_SHA1_HEXSZ);
> +               if (write_in_full(rev_list.in, commit, GIT_SHA1_HEXSZ + 1) < 0) {
>                         if (errno != EPIPE && errno != EINVAL)
>                                 error_errno(_("failed write to rev-list"));
>                         err = -1;
>                         break;
>                 }