Jonathan, do you see any issues with the use of lookup_commit() in
this change wrt lazy clone? I am wondering what happens when the
commit in question is at, an immediate parent of, or an immediate
child of a promisor object. I _think_ this change won't make it
worse for two features in playing together, but thought that it
would be better to double check.
"Johannes Schindelin via GitGitGadget" <gitgitgadget@xxxxxxxxx>
writes:
> From: Johannes Schindelin <johannes.schindelin@xxxxxx>
>
> The `prune_shallow()` function wants a full reachability check to be
> completed before it goes to work, to ensure that all unreachable entries
> are removed from the shallow file.
>
> However, in the upcoming patch we do not even want to go that far. We
> really only need to remove entries corresponding to pruned commits, i.e.
> to commits that no longer exist.
>
> Let's support that use case.
>
> Signed-off-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
> ---
> builtin/prune.c | 2 +-
> commit.h | 2 +-
> shallow.c | 22 +++++++++++++++++-----
> 3 files changed, 19 insertions(+), 7 deletions(-)
>
> diff --git a/builtin/prune.c b/builtin/prune.c
> index 41230f821..6d6ab6cf1 100644
> --- a/builtin/prune.c
> +++ b/builtin/prune.c
> @@ -161,7 +161,7 @@ int cmd_prune(int argc, const char **argv, const char *prefix)
> free(s);
>
> if (is_repository_shallow(the_repository))
> - prune_shallow(show_only);
> + prune_shallow(show_only, 0);
>
> return 0;
> }
> diff --git a/commit.h b/commit.h
> index 1d260d62f..ff34447ab 100644
> --- a/commit.h
> +++ b/commit.h
> @@ -249,7 +249,7 @@ extern void assign_shallow_commits_to_refs(struct shallow_info *info,
> uint32_t **used,
> int *ref_status);
> extern int delayed_reachability_test(struct shallow_info *si, int c);
> -extern void prune_shallow(int show_only);
> +extern void prune_shallow(int show_only, int quick_prune);
> extern struct trace_key trace_shallow;
>
> extern int interactive_add(int argc, const char **argv, const char *prefix, int patch);
> diff --git a/shallow.c b/shallow.c
> index 732e18d54..0a2671bc2 100644
> --- a/shallow.c
> +++ b/shallow.c
> @@ -247,6 +247,7 @@ static void check_shallow_file_for_update(struct repository *r)
>
> #define SEEN_ONLY 1
> #define VERBOSE 2
> +#define QUICK_PRUNE 4
>
> struct write_shallow_data {
> struct strbuf *out;
> @@ -261,7 +262,11 @@ static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
> const char *hex = oid_to_hex(&graft->oid);
> if (graft->nr_parent != -1)
> return 0;
> - if (data->flags & SEEN_ONLY) {
> + if (data->flags & QUICK_PRUNE) {
> + struct commit *c = lookup_commit(the_repository, &graft->oid);
> + if (!c || parse_commit(c))
> + return 0;
> + } else if (data->flags & SEEN_ONLY) {
> struct commit *c = lookup_commit(the_repository, &graft->oid);
> if (!c || !(c->object.flags & SEEN)) {
> if (data->flags & VERBOSE)
> @@ -371,16 +376,23 @@ void advertise_shallow_grafts(int fd)
>
> /*
> * mark_reachable_objects() should have been run prior to this and all
> - * reachable commits marked as "SEEN".
> + * reachable commits marked as "SEEN", except when quick_prune is non-zero,
> + * in which case lines are excised from the shallow file if they refer to
> + * commits that do not exist (any longer).
> */
> -void prune_shallow(int show_only)
> +void prune_shallow(int show_only, int quick_prune)
> {
> struct lock_file shallow_lock = LOCK_INIT;
> struct strbuf sb = STRBUF_INIT;
> + unsigned flags = SEEN_ONLY;
> int fd;
>
> + if (quick_prune)
> + flags |= QUICK_PRUNE;
> +
> if (show_only) {
> - write_shallow_commits_1(&sb, 0, NULL, SEEN_ONLY | VERBOSE);
> + flags |= VERBOSE;
> + write_shallow_commits_1(&sb, 0, NULL, flags);
> strbuf_release(&sb);
> return;
> }
> @@ -388,7 +400,7 @@ void prune_shallow(int show_only)
> git_path_shallow(the_repository),
> LOCK_DIE_ON_ERROR);
> check_shallow_file_for_update(the_repository);
> - if (write_shallow_commits_1(&sb, 0, NULL, SEEN_ONLY)) {
> + if (write_shallow_commits_1(&sb, 0, NULL, flags)) {
> if (write_in_full(fd, sb.buf, sb.len) < 0)
> die_errno("failed to write to %s",
> get_lock_file_path(&shallow_lock));
