THIS IS A TEST INSTANCE ONLY! REPOSITORIES CAN BE DELETED AT ANY TIME!

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commit-graph: normalize commit-graph filenames

When writing commit-graph files, we append path data to an
object directory, which may be specified by the user via the
'--object-dir' option. If the user supplies a trailing slash,
or some other alternative path format, the resulting path may
be usable for writing to the correct location. However, when
expiring graph files from the <obj-dir>/info/commit-graphs
directory during a write, we need to compare paths with exact
string matches.

Normalize the commit-graph filenames to avoid ambiguity. This
creates extra allocations, but this is a constant multiple of
the number of commit-graph files, which should be a number in
the single digits.

Further normalize the object directory in the context. Due to
a comparison between g->obj_dir and ctx->obj_dir in
split_graph_merge_strategy(), a trailing slash would prevent
any merging of layers within the same object directory. The
check is there to ensure we do not merge across alternates.
Update the tests to include a case with this trailing slash
problem.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
tags/v2.23.0-rc0
Derrick Stolee Junio C Hamano 5 months ago
parent
commit
16110c9348
2 changed files with 29 additions and 8 deletions
  1. +23
    -7
      commit-graph.c
  2. +6
    -1
      t/t5324-split-commit-graph.sh

+ 23
- 7
commit-graph.c View File

@@ -43,15 +43,23 @@

char *get_commit_graph_filename(const char *obj_dir)
{
return xstrfmt("%s/info/commit-graph", obj_dir);
char *filename = xstrfmt("%s/info/commit-graph", obj_dir);
char *normalized = xmalloc(strlen(filename) + 1);
normalize_path_copy(normalized, filename);
free(filename);
return normalized;
}

static char *get_split_graph_filename(const char *obj_dir,
const char *oid_hex)
{
return xstrfmt("%s/info/commit-graphs/graph-%s.graph",
obj_dir,
oid_hex);
char *filename = xstrfmt("%s/info/commit-graphs/graph-%s.graph",
obj_dir,
oid_hex);
char *normalized = xmalloc(strlen(filename) + 1);
normalize_path_copy(normalized, filename);
free(filename);
return normalized;
}

static char *get_chain_filename(const char *obj_dir)
@@ -746,7 +754,7 @@ struct packed_oid_list {

struct write_commit_graph_context {
struct repository *r;
const char *obj_dir;
char *obj_dir;
char *graph_name;
struct packed_oid_list oids;
struct packed_commit_list commits;
@@ -1729,7 +1737,6 @@ static void expire_commit_graphs(struct write_commit_graph_context *ctx)

if (!found)
unlink(path.buf);

}
}

@@ -1741,6 +1748,7 @@ int write_commit_graph(const char *obj_dir,
{
struct write_commit_graph_context *ctx;
uint32_t i, count_distinct = 0;
size_t len;
int res = 0;

if (!commit_graph_compatible(the_repository))
@@ -1748,7 +1756,14 @@ int write_commit_graph(const char *obj_dir,

ctx = xcalloc(1, sizeof(struct write_commit_graph_context));
ctx->r = the_repository;
ctx->obj_dir = obj_dir;

/* normalize object dir with no trailing slash */
ctx->obj_dir = xmallocz(strlen(obj_dir) + 1);
normalize_path_copy(ctx->obj_dir, obj_dir);
len = strlen(ctx->obj_dir);
if (len && ctx->obj_dir[len - 1] == '/')
ctx->obj_dir[len - 1] = 0;

ctx->append = flags & COMMIT_GRAPH_APPEND ? 1 : 0;
ctx->report_progress = flags & COMMIT_GRAPH_PROGRESS ? 1 : 0;
ctx->split = flags & COMMIT_GRAPH_SPLIT ? 1 : 0;
@@ -1856,6 +1871,7 @@ cleanup:
free(ctx->graph_name);
free(ctx->commits.list);
free(ctx->oids.list);
free(ctx->obj_dir);

if (ctx->commit_graph_filenames_after) {
for (i = 0; i < ctx->num_commit_graphs_after; i++) {


+ 6
- 1
t/t5324-split-commit-graph.sh View File

@@ -163,7 +163,12 @@ test_expect_success 'create fork and chain across alternate' '
test_line_count = 1 graph-files &&
git -c core.commitGraph=true rev-list HEAD >expect &&
git -c core.commitGraph=false rev-list HEAD >actual &&
test_cmp expect actual
test_cmp expect actual &&
test_commit 14 &&
git commit-graph write --reachable --split --object-dir=.git/objects/ &&
test_line_count = 3 $graphdir/commit-graph-chain &&
ls $graphdir/graph-*.graph >graph-files &&
test_line_count = 1 graph-files
)
'



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