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). If a commit graph file
already exists (and core.commitGraph=true), then this operation takes
only 1.8 seconds due to less time spent parsing commits.
Signed-off-by: Derrick Stolee <dsto...@microsoft.com>
---
Documentation/git-commit-graph.txt | 15 ++++++++++++++-
builtin/commit-graph.c | 27 +++++++++++++++++++++------
commit-graph.c | 26 ++++++++++++++++++++++++--
commit-graph.h | 4 +++-
t/t5318-commit-graph.sh | 19 +++++++++++++++++++
5 files changed, 81 insertions(+), 10 deletions(-)
diff --git a/Documentation/git-commit-graph.txt
b/Documentation/git-commit-graph.txt
index 93d50d1..43ac74b 100644
--- a/Documentation/git-commit-graph.txt
+++ b/Documentation/git-commit-graph.txt
@@ -45,7 +45,12 @@ graph-latest file if it is updated by the `--set-latest`
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'::
@@ -79,6 +84,14 @@ $ git commit-graph write --set-latest --delete-expired
$ echo <pack-index> | git commit-graph write --set-latest --delete-expired
--stdin-packs
------------------------------------------------
+* Write a graph file, extending the current graph file using all
+* commits reachable from refs/heads/*, update graph-latest, and delete
+* stale graph files.
++
+------------------------------------------------
+$ git show-ref -s | git commit-graph write --set-latest --delete-expired
--stdin-commits
+------------------------------------------------
+
* Read basic information from a graph file.
+
------------------------------------------------
diff --git a/builtin/commit-graph.c b/builtin/commit-graph.c
index 5f08c40..9b92549 100644
--- a/builtin/commit-graph.c
+++ b/builtin/commit-graph.c
@@ -8,7 +8,7 @@
static char const * const builtin_commit_graph_usage[] = {
N_("git commit-graph [--object-dir <objdir>]"),
N_("git commit-graph read [--object-dir <objdir>] [--file=<hash>]"),
- N_("git commit-graph write [--object-dir <objdir>] [--set-latest]
[--delete-expired] [--stdin-packs]"),
+ N_("git commit-graph write [--object-dir <objdir>] [--set-latest]
[--delete-expired] [--stdin-packs|--stdin-commits]"),
NULL
};
@@ -18,7 +18,7 @@ static const char * const builtin_commit_graph_read_usage[] =
{
};
static const char * const builtin_commit_graph_write_usage[] = {
- N_("git commit-graph write [--object-dir <objdir>] [--set-latest]
[--delete-expired] [--stdin-packs]"),
+ N_("git commit-graph write [--object-dir <objdir>] [--set-latest]
[--delete-expired] [--stdin-packs|--stdin-commits]"),
NULL
};
@@ -28,6 +28,7 @@ static struct opts_commit_graph {
int set_latest;
int delete_expired;
int stdin_packs;
+ int stdin_commits;
} opts;
static int graph_read(int argc, const char **argv)
@@ -152,6 +153,8 @@ static int graph_write(int argc, const char **argv)
char *old_graph_name;
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;
@@ -166,6 +169,8 @@ 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(),
};
@@ -173,12 +178,14 @@ 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.obj_dir)
opts.obj_dir = get_object_directory();
old_graph_name = get_graph_latest_contents(opts.obj_dir);
- if (opts.stdin_packs) {
+ if (opts.stdin_packs || opts.stdin_commits) {
struct strbuf buf = STRBUF_INIT;
nr_lines = 0;
alloc_lines = 128;
@@ -190,13 +197,21 @@ 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_name = write_commit_graph(opts.obj_dir,
pack_indexes,
- nr_packs);
+ nr_packs,
+ commit_hex,
+ nr_commits);
if (graph_name) {
if (opts.set_latest)
diff --git a/commit-graph.c b/commit-graph.c
index 943192c..b9e938c 100644
--- a/commit-graph.c
+++ b/commit-graph.c
@@ -556,7 +556,9 @@ static void close_reachable(struct packed_oid_list *oids)
char *write_commit_graph(const char *obj_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;
@@ -599,7 +601,27 @@ char *write_commit_graph(const char *obj_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);
+ oidcpy(&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 5617842..2582a3c 100644
--- a/commit-graph.h
+++ b/commit-graph.h
@@ -41,7 +41,9 @@ extern void prepare_commit_graph(void);
extern char *write_commit_graph(const char *obj_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 5bd1f77..2ed6b19 100755
--- a/t/t5318-commit-graph.sh
+++ b/t/t5318-commit-graph.sh
@@ -196,6 +196,25 @@ 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/2 &&
+ git rev-parse tag/merge >commits-in &&
+ git rev-parse merge/1 >>commits-in &&
+ rm $objdir/info/graph-latest &&
+ graph6=$(cat commits-in | git commit-graph write --set-latest
--delete-expired --stdin-commits) &&
+ test_path_is_file $objdir/info/$graph6 &&
+ test_path_is_missing $objdir/info/$graph5 &&
+ test_path_is_file $objdir/info/graph-latest &&
+ printf $graph6 >expect &&
+ test_cmp expect $objdir/info/graph-latest &&
+ git commit-graph read --file=$graph6 >output &&
+ graph_read_expect "6" &&
+ 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 &&
--
2.7.4
