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commit-graph: check mixed generation validation when loading chain file

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In read_commit_graph_one(), we call validate_mixed_generation_chain()
after loading the graph. Even though we don't check the return value,
this has the side effect of clearing the read_generation_data flag,
which is important when working with mixed generation numbers.

But doing this in load_commit_graph_chain_fd_st() makes more sense:

  1. We are calling it even when we did not load a chain at all, which
     is pointless (you cannot have mixed generations in a single file).

  2. For now, all callers load the graph via read_commit_graph_one().
     But the point of factoring out the open/load in the previous commit
     was to let "commit-graph verify" call them separately. So it needs
     to trigger this function as part of the load.

     Without this patch, the mixed-generation tests in t5324 would start
     failing on "git commit-graph verify" calls, once we switch to using
     a separate open/load call there.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2023-09-28 00:38:17 -04:00 committed by Junio C Hamano
parent 7ed76b4eb2
commit 8298b54317
1 changed files with 27 additions and 27 deletions
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54
commit-graph.c
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@ -473,6 +473,31 @@ static struct commit_graph *load_commit_graph_v1(struct repository *r,
return g;
}
/*
* returns 1 if and only if all graphs in the chain have
* corrected commit dates stored in the generation_data chunk.
*/
static int validate_mixed_generation_chain(struct commit_graph *g)
{
int read_generation_data = 1;
struct commit_graph *p = g;
while (read_generation_data && p) {
read_generation_data = p->read_generation_data;
p = p->base_graph;
}
if (read_generation_data)
return 1;
while (g) {
g->read_generation_data = 0;
g = g->base_graph;
}
return 0;
}
static int add_graph_to_chain(struct commit_graph *g,
struct commit_graph *chain,
struct object_id *oids,
@ -581,6 +606,8 @@ struct commit_graph *load_commit_graph_chain_fd_st(struct repository *r,
}
}
validate_mixed_generation_chain(graph_chain);
free(oids);
fclose(fp);
strbuf_release(&line);
@ -605,31 +632,6 @@ static struct commit_graph *load_commit_graph_chain(struct repository *r,
return g;
}
/*
* returns 1 if and only if all graphs in the chain have
* corrected commit dates stored in the generation_data chunk.
*/
static int validate_mixed_generation_chain(struct commit_graph *g)
{
int read_generation_data = 1;
struct commit_graph *p = g;
while (read_generation_data && p) {
read_generation_data = p->read_generation_data;
p = p->base_graph;
}
if (read_generation_data)
return 1;
while (g) {
g->read_generation_data = 0;
g = g->base_graph;
}
return 0;
}
struct commit_graph *read_commit_graph_one(struct repository *r,
struct object_directory *odb)
{
@ -638,8 +640,6 @@ struct commit_graph *read_commit_graph_one(struct repository *r,
if (!g)
g = load_commit_graph_chain(r, odb);
validate_mixed_generation_chain(g);
return g;
}