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.
To complete the effectiveness, we need to use the filename
methods when iterating over the info/commit-graphs directory
instead of constructing the paths manually.
Signed-off-by: Derrick Stolee <dsto...@microsoft.com>
---
Junio,
I noticed the need for this patch while integrating the
split commit-graph series into VFS for Git, since our
C# code was storing the alternates directory with a trailing
slash, causing some confusion in the expire logic.
This could be added to ds/commit-graph-incremental (and I
could add it to a future revision, if necessary) or could
be a new branch on top of that series.
Thanks,
-Stolee
commit-graph.c | 29 +++++++++++++++++------------
1 file changed, 17 insertions(+), 12 deletions(-)
diff --git a/commit-graph.c b/commit-graph.c
index 8842f93910..e0f3e8a954 100644
--- a/commit-graph.c
+++ b/commit-graph.c
@@ -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)
@@ -1680,7 +1688,6 @@ static void expire_commit_graphs(struct
write_commit_graph_context *ctx)
struct strbuf path = STRBUF_INIT;
DIR *dir;
struct dirent *de;
- size_t dirnamelen;
timestamp_t expire_time = time(NULL);
if (ctx->split_opts && ctx->split_opts->expire_time)
@@ -1701,16 +1708,13 @@ static void expire_commit_graphs(struct
write_commit_graph_context *ctx)
return;
}
- strbuf_addch(&path, '/');
- dirnamelen = path.len;
while ((de = readdir(dir)) != NULL) {
struct stat st;
uint32_t i, found = 0;
- strbuf_setlen(&path, dirnamelen);
- strbuf_addstr(&path, de->d_name);
+ char *filename = get_split_graph_filename(path.buf, de->d_name);
- stat(path.buf, &st);
+ stat(filename, &st);
if (st.st_mtime > expire_time)
continue;
@@ -1719,15 +1723,16 @@ static void expire_commit_graphs(struct
write_commit_graph_context *ctx)
for (i = 0; i < ctx->num_commit_graphs_after; i++) {
if (!strcmp(ctx->commit_graph_filenames_after[i],
- path.buf)) {
+ filename)) {
found = 1;
break;
}
}
if (!found)
- unlink(path.buf);
+ unlink(filename);
+ free(filename);
}
}
--
2.22.0.430.g4f3aec613b
