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 | 14 +++++++++++++-
builtin/commit-graph.c | 27 +++++++++++++++++++++------
commit-graph.c | 27 +++++++++++++++++++++++++--
commit-graph.h | 4 +++-
t/t5318-commit-graph.sh | 13 +++++++++++++
5 files changed, 75 insertions(+), 10 deletions(-)
diff --git a/Documentation/git-commit-graph.txt
b/Documentation/git-commit-graph.txt
index b945510..0710a68 100644
--- a/Documentation/git-commit-graph.txt
+++ b/Documentation/git-commit-graph.txt
@@ -34,7 +34,13 @@ COMMANDS
Write a commit graph file based on the commits found in packfiles.
+
With the `--stdin-packs` option, generate the new commit graph by
-walking objects only in the specified packfiles.
+walking objects only in the specified packfiles. (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'::
@@ -58,6 +64,12 @@ $ git commit-graph write
$ echo <pack-index> | git commit-graph write --stdin-packs
------------------------------------------------
+* Write a graph file containing all reachable commits.
++
+------------------------------------------------
+$ git show-ref -s | git commit-graph write --stdin-commits
+------------------------------------------------
+
* Read basic information from the commit-graph file.
+
------------------------------------------------
diff --git a/builtin/commit-graph.c b/builtin/commit-graph.c
index eebca57..1c7b7e7 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>]"),
- N_("git commit-graph write [--object-dir <objdir>] [--stdin-packs]"),
+ N_("git commit-graph write [--object-dir <objdir>]
[--stdin-packs|--stdin-commits]"),
NULL
};
@@ -18,13 +18,14 @@ 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>] [--stdin-packs]"),
+ N_("git commit-graph write [--object-dir <objdir>]
[--stdin-packs|--stdin-commits]"),
NULL
};
static struct opts_commit_graph {
const char *obj_dir;
int stdin_packs;
+ int stdin_commits;
} opts;
static int graph_read(int argc, const char **argv)
@@ -79,6 +80,8 @@ static int graph_write(int argc, const char **argv)
{
const char **pack_indexes = NULL;
int packs_nr = 0;
+ const char **commit_hex = NULL;
+ int commits_nr = 0;
const char **lines = NULL;
int lines_nr = 0;
int lines_alloc = 0;
@@ -89,6 +92,8 @@ static int graph_write(int argc, const char **argv)
N_("The object directory to store the graph")),
OPT_BOOL(0, "stdin-packs", &opts.stdin_packs,
N_("scan packfiles listed by stdin for commits")),
+ OPT_BOOL(0, "stdin-commits", &opts.stdin_commits,
+ N_("start walk at commits listed by stdin")),
OPT_END(),
};
@@ -96,10 +101,12 @@ 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();
- if (opts.stdin_packs) {
+ if (opts.stdin_packs || opts.stdin_commits) {
struct strbuf buf = STRBUF_INIT;
lines_nr = 0;
lines_alloc = 128;
@@ -110,13 +117,21 @@ static int graph_write(int argc, const char **argv)
lines[lines_nr++] = strbuf_detach(&buf, NULL);
}
- pack_indexes = lines;
- packs_nr = lines_nr;
+ if (opts.stdin_packs) {
+ pack_indexes = lines;
+ packs_nr = lines_nr;
+ }
+ if (opts.stdin_commits) {
+ commit_hex = lines;
+ commits_nr = lines_nr;
+ }
}
write_commit_graph(opts.obj_dir,
pack_indexes,
- packs_nr);
+ packs_nr,
+ commit_hex,
+ commits_nr);
return 0;
}
diff --git a/commit-graph.c b/commit-graph.c
index 4e9f1d5..dbb9801 100644
--- a/commit-graph.c
+++ b/commit-graph.c
@@ -531,7 +531,9 @@ static void close_reachable(struct packed_oid_list *oids)
void 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;
@@ -572,7 +574,28 @@ void write_commit_graph(const char *obj_dir,
close_pack(p);
}
strbuf_release(&packname);
- } 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(add_packed_commits, &oids, 0);
close_reachable(&oids);
diff --git a/commit-graph.h b/commit-graph.h
index 65fe770..4c70281 100644
--- a/commit-graph.h
+++ b/commit-graph.h
@@ -38,7 +38,9 @@ struct commit_graph *load_commit_graph_one(const char
*graph_file);
void 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 6bc529c..9589238 100755
--- a/t/t5318-commit-graph.sh
+++ b/t/t5318-commit-graph.sh
@@ -177,6 +177,19 @@ test_expect_success 'build graph from latest pack with
closure' '
graph_git_behavior 'graph from pack, commit 8 vs merge 1' full commits/8
merge/1
graph_git_behavior 'graph from pack, commit 8 vs merge 2' full commits/8
merge/2
+test_expect_success 'build graph from commits with closure' '
+ cd "$TRASH_DIRECTORY/full" &&
+ git tag -a -m "merge" tag/merge merge/2 &&
+ git rev-parse tag/merge >commits-in &&
+ git rev-parse merge/1 >>commits-in &&
+ cat commits-in | git commit-graph write --stdin-commits &&
+ test_path_is_file $objdir/info/commit-graph &&
+ graph_read_expect "6"
+'
+
+graph_git_behavior 'graph from commits, commit 8 vs merge 1' full commits/8
merge/1
+graph_git_behavior 'graph from commits, commit 8 vs merge 2' full commits/8
merge/2
+
test_expect_success 'setup bare repo' '
cd "$TRASH_DIRECTORY" &&
git clone --bare --no-local full bare &&
--
2.7.4
