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commit-graph: implement git commit-graph read

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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 <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Derrick Stolee
2018-04-10 08:56:02 -04:00
committed by Junio C Hamano
parent f237c8b6fe
commit 2a2e32bdc5
5 changed files with 254 additions and 6 deletions
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56
builtin/commit-graph.c
View File

@ -7,10 +7,16 @@
static char const * const builtin_commit_graph_usage[] = {
N_("git commit-graph [--object-dir <objdir>]"),
N_("git commit-graph read [--object-dir <objdir>]"),
N_("git commit-graph write [--object-dir <objdir>]"),
NULL
};
static const char * const builtin_commit_graph_read_usage[] = {
N_("git commit-graph read [--object-dir <objdir>]"),
NULL
};
static const char * const builtin_commit_graph_write_usage[] = {
N_("git commit-graph write [--object-dir <objdir>]"),
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 = NULL;
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);
}