On Fri, Oct 7, 2016 at 8:06 AM, Heiko Voigt <hvoigt@xxxxxxxxxx> wrote:
> To check whether a submodule needs to be pushed we need to collect all
> changed submodules. Lets collect them first and then execute the
> possibly expensive test whether certain revisions are already pushed
> only once per submodule.
>
> There is further potential for optimization since we can assemble one
> command and only issued that instead of one call for each remote ref in
> the submodule.
>
> Signed-off-by: Heiko Voigt <hvoigt@xxxxxxxxxx>
> ---
> submodule.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++-----
> 1 file changed, 58 insertions(+), 5 deletions(-)
>
> diff --git a/submodule.c b/submodule.c
> index 2de06a3351..59c9d15905 100644
> --- a/submodule.c
> +++ b/submodule.c
> @@ -554,19 +554,34 @@ static int submodule_needs_pushing(const char *path, const unsigned char sha1[20
> return 0;
> }
>
> +static struct sha1_array *get_sha1s_from_list(struct string_list *submodules,
> + const char *path)
So this will take the stringlist `submodules` and insert the path into it,
if it wasn't already in there. In case it is newly inserted, add a sha1_array
as util, so each inserted path has it's own empty array.
So it is both init of the data structures as well as retrieving them. I was
initially confused by the name as I assumed it would give you sha1s out
of a string list (e.g. transform strings to internal sha1 things).
Maybe it's just
me having a hard time to understand that, but I feel like the name could be
improved.
lookup_sha1_list_by_path,
insert_path_and_return_sha1_list ?
> +{
> + struct string_list_item *item;
> +
> + item = string_list_insert(submodules, path);
> + if (item->util)
> + return (struct sha1_array *) item->util;
> +
> + /* NEEDSWORK: should we have sha1_array_init()? */
> + item->util = xcalloc(1, sizeof(struct sha1_array));
> + return (struct sha1_array *) item->util;
> +}
> +
> static void collect_submodules_from_diff(struct diff_queue_struct *q,
> struct diff_options *options,
> void *data)
> {
> int i;
> - struct string_list *needs_pushing = data;
> + struct string_list *submodules = data;
>
> for (i = 0; i < q->nr; i++) {
> struct diff_filepair *p = q->queue[i];
> + struct sha1_array *hashes;
> if (!S_ISGITLINK(p->two->mode))
> continue;
> - if (submodule_needs_pushing(p->two->path, p->two->oid.hash))
> - string_list_insert(needs_pushing, p->two->path);
> + hashes = get_sha1s_from_list(submodules, p->two->path);
> + sha1_array_append(hashes, p->two->oid.hash);
> }
> }
>
> @@ -582,14 +597,41 @@ static void find_unpushed_submodule_commits(struct commit *commit,
> diff_tree_combined_merge(commit, 1, &rev);
> }
>
> +struct collect_submodule_from_sha1s_data {
> + char *submodule_path;
> + struct string_list *needs_pushing;
> +};
> +
> +static void collect_submodules_from_sha1s(const unsigned char sha1[20],
> + void *data)
> +{
> + struct collect_submodule_from_sha1s_data *me =
> + (struct collect_submodule_from_sha1s_data *) data;
> +
> + if (submodule_needs_pushing(me->submodule_path, sha1))
> + string_list_insert(me->needs_pushing, me->submodule_path);
> +}
> +
> +static void free_submodules_sha1s(struct string_list *submodules)
> +{
> + int i;
> + for (i = 0; i < submodules->nr; i++) {
> + struct string_list_item *item = &submodules->items[i];
You do not seem to make use of `i` explicitely, so
for_each_string_list_item might be more readable here?
> + struct sha1_array *hashes = (struct sha1_array *) item->util;
> + sha1_array_clear(hashes);
> + }
> + string_list_clear(submodules, 1);
> +}
> +
> int find_unpushed_submodules(unsigned char new_sha1[20],
> const char *remotes_name, struct string_list *needs_pushing)
> {
> struct rev_info rev;
> struct commit *commit;
> const char *argv[] = {NULL, NULL, "--not", "NULL", NULL};
> - int argc = ARRAY_SIZE(argv) - 1;
> + int argc = ARRAY_SIZE(argv) - 1, i;
> char *sha1_copy;
> + struct string_list submodules = STRING_LIST_INIT_DUP;
>
> struct strbuf remotes_arg = STRBUF_INIT;
>
> @@ -603,12 +645,23 @@ int find_unpushed_submodules(unsigned char new_sha1[20],
> die("revision walk setup failed");
>
> while ((commit = get_revision(&rev)) != NULL)
> - find_unpushed_submodule_commits(commit, needs_pushing);
> + find_unpushed_submodule_commits(commit, &submodules);
>
> reset_revision_walk();
> free(sha1_copy);
> strbuf_release(&remotes_arg);
>
> + for (i = 0; i < submodules.nr; i++) {
> + struct string_list_item *item = &submodules.items[i];
You do not seem to make use of `i` explicitely, so
for_each_string_list_item might be more readable here?
> + struct collect_submodule_from_sha1s_data data;
> + data.submodule_path = item->string;
> + data.needs_pushing = needs_pushing;
> + sha1_array_for_each_unique((struct sha1_array *) item->util,
> + collect_submodules_from_sha1s,
> + &data);
> + }
> + free_submodules_sha1s(&submodules);
> +
> return needs_pushing->nr;
> }
>
> --
> 2.10.1.637.g09b28c5
>