Teach git-commit-graph to read commits from stdin when the
--stdin-commits flag is specified. Commits reachable from these
commits are added to the graph. This is a much faster way to construct
the graph than inspecting all packed objects, but is restricted to
known tips.
For the Linux repository, 700,000+ commits were added to the graph
file starting from 'master' in 7-9 seconds, depending on the number
of packfiles in the repo (1, 24, or 120).
Signed-off-by: Derrick Stolee <dsto...@microsoft.com>
---
Documentation/git-commit-graph.txt | 15 ++++++++++++++-
builtin/commit-graph.c | 26 +++++++++++++++++++++-----
commit-graph.c | 26 ++++++++++++++++++++++++--
commit-graph.h | 4 +++-
t/t5318-commit-graph.sh | 19 +++++++++++++++++++
5 files changed, 81 insertions(+), 9 deletions(-)
diff --git a/Documentation/git-commit-graph.txt
b/Documentation/git-commit-graph.txt
index 727d5d70bb..bd1c54025a 100644
--- a/Documentation/git-commit-graph.txt
+++ b/Documentation/git-commit-graph.txt
@@ -45,7 +45,12 @@ graph-head file if it is updated by the `--update-head`
option.
+
With the `--stdin-packs` option, generate the new commit graph by
walking objects only in the specified packfiles and any commits in
-the existing graph-head.
+the existing graph-head. (Cannot be combined with --stdin-commits.)
++
+With the `--stdin-commits` option, generate the new commit graph by
+walking commits starting at the commits specified in stdin as a list
+of OIDs in hex, one OID per line. (Cannot be combined with
+--stdin-packs.)
'read'::
@@ -83,6 +88,14 @@ $ git commit-graph write --update-head --delete-expired
$ echo <pack-index> | git commit-graph write --update-head --delete-expired
--stdin-packs
------------------------------------------------
+* Write a graph file, extending the current graph file using all
+* commits reachable from refs/heads/*, update graph-head, and delete
+* stale graph files.
++
+------------------------------------------------
+$ git show-ref --heads -s | git commit-graph write --update-head
--delete-expired --stdin-commits
+------------------------------------------------
+
* Read basic information from a graph file.
+
------------------------------------------------
diff --git a/builtin/commit-graph.c b/builtin/commit-graph.c
index fe5f00551c..28d043b5a8 100644
--- a/builtin/commit-graph.c
+++ b/builtin/commit-graph.c
@@ -9,7 +9,7 @@ static char const * const builtin_commit_graph_usage[] = {
N_("git commit-graph [--pack-dir <packdir>]"),
N_("git commit-graph clear [--pack-dir <packdir>]"),
N_("git commit-graph read [--graph-hash=<hash>]"),
- N_("git commit-graph write [--pack-dir <packdir>] [--update-head]
[--delete-expired] [--stdin-packs]"),
+ N_("git commit-graph write [--pack-dir <packdir>] [--update-head]
[--delete-expired] [--stdin-packs|--stdin-commits]"),
NULL
};
@@ -24,7 +24,7 @@ static const char * const builtin_commit_graph_read_usage[] =
{
};
static const char * const builtin_commit_graph_write_usage[] = {
- N_("git commit-graph write [--pack-dir <packdir>] [--update-head]
[--delete-expired] [--stdin-packs]"),
+ N_("git commit-graph write [--pack-dir <packdir>] [--update-head]
[--delete-expired] [--stdin-packs|--stdin-commits]"),
NULL
};
@@ -34,6 +34,7 @@ static struct opts_commit_graph {
int update_head;
int delete_expired;
int stdin_packs;
+ int stdin_commits;
} opts;
static int graph_clear(int argc, const char **argv)
@@ -219,6 +220,8 @@ static int graph_write(int argc, const char **argv)
int has_existing;
const char **pack_indexes = NULL;
int nr_packs = 0;
+ const char **commit_hex = NULL;
+ int nr_commits = 0;
const char **lines = NULL;
int nr_lines = 0;
int alloc_lines = 0;
@@ -233,6 +236,8 @@ static int graph_write(int argc, const char **argv)
N_("delete expired head graph file")),
OPT_BOOL('s', "stdin-packs", &opts.stdin_packs,
N_("only scan packfiles listed by stdin")),
+ OPT_BOOL('C', "stdin-commits", &opts.stdin_commits,
+ N_("start walk at commits listed by stdin")),
OPT_END(),
};
@@ -240,6 +245,9 @@ static int graph_write(int argc, const char **argv)
builtin_commit_graph_write_options,
builtin_commit_graph_write_usage, 0);
+ if (opts.stdin_packs && opts.stdin_commits)
+ die(_("cannot use both --stdin-commits and --stdin-packs"));
+
if (!opts.pack_dir) {
struct strbuf path = STRBUF_INIT;
strbuf_addstr(&path, get_object_directory());
@@ -261,13 +269,21 @@ static int graph_write(int argc, const char **argv)
strbuf_detach(&buf, NULL);
}
- pack_indexes = lines;
- nr_packs = nr_lines;
+ if (opts.stdin_packs) {
+ pack_indexes = lines;
+ nr_packs = nr_lines;
+ }
+ if (opts.stdin_commits) {
+ commit_hex = lines;
+ nr_commits = nr_lines;
+ }
}
graph_hash = write_commit_graph(opts.pack_dir,
pack_indexes,
- nr_packs);
+ nr_packs,
+ commit_hex,
+ nr_commits);
if (opts.update_head)
update_head_file(opts.pack_dir, graph_hash);
diff --git a/commit-graph.c b/commit-graph.c
index 27a34f5eda..3ff3ab03ca 100644
--- a/commit-graph.c
+++ b/commit-graph.c
@@ -657,7 +657,9 @@ static void close_reachable(struct packed_oid_list *oids)
struct object_id *write_commit_graph(const char *pack_dir,
const char **pack_indexes,
- int nr_packs)
+ int nr_packs,
+ const char **commit_hex,
+ int nr_commits)
{
struct packed_oid_list oids;
struct packed_commit_list commits;
@@ -710,7 +712,27 @@ struct object_id *write_commit_graph(const char *pack_dir,
close_pack(p);
}
}
- else
+
+ if (commit_hex) {
+ for (i = 0; i < nr_commits; i++) {
+ const char *end;
+ struct object_id oid;
+ struct commit *result;
+
+ if (commit_hex[i] && parse_oid_hex(commit_hex[i], &oid,
&end))
+ continue;
+
+ result = lookup_commit_reference_gently(&oid, 1);
+
+ if (result) {
+ ALLOC_GROW(oids.list, oids.nr + 1, oids.alloc);
+ oids.list[oids.nr] = &(result->object.oid);
+ oids.nr++;
+ }
+ }
+ }
+
+ if (!pack_indexes && !commit_hex)
for_each_packed_object(if_packed_commit_add_to_list, &oids, 0);
close_reachable(&oids);
diff --git a/commit-graph.h b/commit-graph.h
index 918b34dd2b..c412f76707 100644
--- a/commit-graph.h
+++ b/commit-graph.h
@@ -52,7 +52,9 @@ extern struct object_id *get_nth_commit_oid(struct
commit_graph *g,
extern struct object_id *write_commit_graph(const char *pack_dir,
const char **pack_indexes,
- int nr_packs);
+ int nr_packs,
+ const char **commit_hex,
+ int nr_commits);
#endif
diff --git a/t/t5318-commit-graph.sh b/t/t5318-commit-graph.sh
index e3546e6844..d803c12afd 100755
--- a/t/t5318-commit-graph.sh
+++ b/t/t5318-commit-graph.sh
@@ -182,6 +182,25 @@ test_expect_success 'build graph from latest pack with
closure' '
graph_git_behavior 'graph from pack, commit 8 vs merge 1' commits/8 merge/1
graph_git_behavior 'graph from pack, commit 8 vs merge 2' commits/8 merge/2
+test_expect_success 'build graph from commits with closure' '
+ git tag -a -m "merge" tag/merge merge/3 &&
+ git rev-parse tag/merge >commits-in &&
+ git rev-parse commits/8 >>commits-in &&
+ git rev-parse merge/1 >>commits-in &&
+ git rev-parse merge/2 >>commits-in &&
+ graph6=$(cat commits-in | git commit-graph write --update-head
--delete-expired --stdin-commits) &&
+ test_path_is_file $packdir/graph-$graph6.graph &&
+ test_path_is_file $packdir/graph-$graph5.graph &&
+ test_path_is_file $packdir/graph-head &&
+ printf $graph6 >expect &&
+ test_cmp expect $packdir/graph-head &&
+ git commit-graph read --graph-hash=$graph6 >output &&
+ graph_read_expect "11" "$packdir" &&
+ test_cmp expect output'
+
+graph_git_behavior 'graph from commits, commit 8 vs merge 1' commits/8 merge/1
+graph_git_behavior 'graph from commits, commit 8 vs merge 2' commits/8 merge/2
+
test_expect_success 'setup bare repo' '
cd .. &&
git clone --bare --no-local full bare &&
--
2.15.1.45.g9b7079f
