From: Derrick Stolee
Teach git-commit-graph to read commit graph files and summarize their contents.
Use the read subcommand to verify the contents of a commit graph file in the
tests.
Signed-off-by: Derrick Stolee
---
Documentation/git-commit-graph.txt | 12 +++
builtin/commit-graph.c | 56
commit-graph.c | 137 -
commit-graph.h | 23 +
t/t5318-commit-graph.sh| 32 +--
5 files changed, 254 insertions(+), 6 deletions(-)
diff --git a/Documentation/git-commit-graph.txt
b/Documentation/git-commit-graph.txt
index 47996e8f89..8aad8303f5 100644
--- a/Documentation/git-commit-graph.txt
+++ b/Documentation/git-commit-graph.txt
@@ -9,6 +9,7 @@ git-commit-graph - Write and verify Git commit graph files
SYNOPSIS
[verse]
+'git commit-graph read' [--object-dir ]
'git commit-graph write' [--object-dir ]
@@ -35,6 +36,11 @@ COMMANDS
Write a commit graph file based on the commits found in packfiles.
Includes all commits from the existing commit graph file.
+'read'::
+
+Read a graph file given by the commit-graph file and output basic
+details about the graph file. Used for debugging purposes.
+
EXAMPLES
@@ -45,6 +51,12 @@ EXAMPLES
$ git commit-graph write
+* Read basic information from the commit-graph file.
++
+
+$ git commit-graph read
+
+
GIT
---
diff --git a/builtin/commit-graph.c b/builtin/commit-graph.c
index 26b6360289..e3f67401fb 100644
--- a/builtin/commit-graph.c
+++ b/builtin/commit-graph.c
@@ -7,10 +7,16 @@
static char const * const builtin_commit_graph_usage[] = {
N_("git commit-graph [--object-dir ]"),
+ N_("git commit-graph read [--object-dir ]"),
N_("git commit-graph write [--object-dir ]"),
NULL
};
+static const char * const builtin_commit_graph_read_usage[] = {
+ N_("git commit-graph read [--object-dir ]"),
+ NULL
+};
+
static const char * const builtin_commit_graph_write_usage[] = {
N_("git commit-graph write [--object-dir ]"),
NULL
@@ -20,6 +26,54 @@ static struct opts_commit_graph {
const char *obj_dir;
} opts;
+static int graph_read(int argc, const char **argv)
+{
+ struct commit_graph *graph = 0;
+ char *graph_name;
+
+ static struct option builtin_commit_graph_read_options[] = {
+ OPT_STRING(0, "object-dir", &opts.obj_dir,
+ N_("dir"),
+ N_("The object directory to store the graph")),
+ OPT_END(),
+ };
+
+ argc = parse_options(argc, argv, NULL,
+builtin_commit_graph_read_options,
+builtin_commit_graph_read_usage, 0);
+
+ if (!opts.obj_dir)
+ opts.obj_dir = get_object_directory();
+
+ graph_name = get_commit_graph_filename(opts.obj_dir);
+ graph = load_commit_graph_one(graph_name);
+
+ if (!graph)
+ die("graph file %s does not exist", graph_name);
+ FREE_AND_NULL(graph_name);
+
+ printf("header: %08x %d %d %d %d\n",
+ ntohl(*(uint32_t*)graph->data),
+ *(unsigned char*)(graph->data + 4),
+ *(unsigned char*)(graph->data + 5),
+ *(unsigned char*)(graph->data + 6),
+ *(unsigned char*)(graph->data + 7));
+ printf("num_commits: %u\n", graph->num_commits);
+ printf("chunks:");
+
+ if (graph->chunk_oid_fanout)
+ printf(" oid_fanout");
+ if (graph->chunk_oid_lookup)
+ printf(" oid_lookup");
+ if (graph->chunk_commit_data)
+ printf(" commit_metadata");
+ if (graph->chunk_large_edges)
+ printf(" large_edges");
+ printf("\n");
+
+ return 0;
+}
+
static int graph_write(int argc, const char **argv)
{
static struct option builtin_commit_graph_write_options[] = {
@@ -60,6 +114,8 @@ int cmd_commit_graph(int argc, const char **argv, const char
*prefix)
PARSE_OPT_STOP_AT_NON_OPTION);
if (argc > 0) {
+ if (!strcmp(argv[0], "read"))
+ return graph_read(argc, argv);
if (!strcmp(argv[0], "write"))
return graph_write(argc, argv);
}
diff --git a/commit-graph.c b/commit-graph.c
index f3f7c4f189..b1bd3a892d 100644
--- a/commit-graph.c
+++ b/commit-graph.c
@@ -39,11 +39,146 @@
GRAPH_OID_LEN + 8)
-static char *get_commit_graph_filename(const char *obj_dir)
+char *get_commit_graph_filename(const char *obj_dir)
{
return xstrfmt("%s/info/commit-graph", obj_dir);
}
+static struct commit_graph *alloc_commit_graph(void)
+{
+ struct commit_graph *g = xcalloc(1, sizeof(*g));
+ g->grap