[PATCH v2 03/14] commit-graph: create git-commit-graph builtin

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Teach git the 'commit-graph' builtin that will be used for writing and
reading packed graph files. The current implementation is mostly
empty, except for a '--pack-dir' option.

Signed-off-by: Derrick Stolee <dstolee@xxxxxxxxxxxxx>
---
 .gitignore                         |  1 +
 Documentation/git-commit-graph.txt |  7 +++++++
 Makefile                           |  1 +
 builtin.h                          |  1 +
 builtin/commit-graph.c             | 33 +++++++++++++++++++++++++++++++++
 command-list.txt                   |  1 +
 git.c                              |  1 +
 7 files changed, 45 insertions(+)
 create mode 100644 Documentation/git-commit-graph.txt
 create mode 100644 builtin/commit-graph.c

diff --git a/.gitignore b/.gitignore
index 833ef3b0b7..e82f90184d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -34,6 +34,7 @@
 /git-clone
 /git-column
 /git-commit
+/git-commit-graph
 /git-commit-tree
 /git-config
 /git-count-objects
diff --git a/Documentation/git-commit-graph.txt b/Documentation/git-commit-graph.txt
new file mode 100644
index 0000000000..c8ea548dfb
--- /dev/null
+++ b/Documentation/git-commit-graph.txt
@@ -0,0 +1,7 @@
+git-commit-graph(1)
+============
+
+NAME
+----
+git-commit-graph - Write and verify Git commit graphs (.graph files)
+
diff --git a/Makefile b/Makefile
index 1a9b23b679..aee5d3f7b9 100644
--- a/Makefile
+++ b/Makefile
@@ -965,6 +965,7 @@ BUILTIN_OBJS += builtin/for-each-ref.o
 BUILTIN_OBJS += builtin/fsck.o
 BUILTIN_OBJS += builtin/gc.o
 BUILTIN_OBJS += builtin/get-tar-commit-id.o
+BUILTIN_OBJS += builtin/commit-graph.o
 BUILTIN_OBJS += builtin/grep.o
 BUILTIN_OBJS += builtin/hash-object.o
 BUILTIN_OBJS += builtin/help.o
diff --git a/builtin.h b/builtin.h
index 42378f3aa4..079855b6d4 100644
--- a/builtin.h
+++ b/builtin.h
@@ -149,6 +149,7 @@ extern int cmd_clone(int argc, const char **argv, const char *prefix);
 extern int cmd_clean(int argc, const char **argv, const char *prefix);
 extern int cmd_column(int argc, const char **argv, const char *prefix);
 extern int cmd_commit(int argc, const char **argv, const char *prefix);
+extern int cmd_commit_graph(int argc, const char **argv, const char *prefix);
 extern int cmd_commit_tree(int argc, const char **argv, const char *prefix);
 extern int cmd_config(int argc, const char **argv, const char *prefix);
 extern int cmd_count_objects(int argc, const char **argv, const char *prefix);
diff --git a/builtin/commit-graph.c b/builtin/commit-graph.c
new file mode 100644
index 0000000000..2104550d25
--- /dev/null
+++ b/builtin/commit-graph.c
@@ -0,0 +1,33 @@
+#include "builtin.h"
+#include "cache.h"
+#include "config.h"
+#include "dir.h"
+#include "git-compat-util.h"
+#include "lockfile.h"
+#include "packfile.h"
+#include "parse-options.h"
+
+static char const * const builtin_commit_graph_usage[] = {
+	N_("git commit-graph [--pack-dir <packdir>]"),
+	NULL
+};
+
+static struct opts_commit_graph {
+	const char *pack_dir;
+} opts;
+
+int cmd_commit_graph(int argc, const char **argv, const char *prefix)
+{
+	static struct option builtin_commit_graph_options[] = {
+		{ OPTION_STRING, 'p', "pack-dir", &opts.pack_dir,
+			N_("dir"),
+			N_("The pack directory to store the graph") },
+		OPT_END(),
+	};
+
+	if (argc == 2 && !strcmp(argv[1], "-h"))
+		usage_with_options(builtin_commit_graph_usage,
+				   builtin_commit_graph_options);
+
+	return 0;
+}
diff --git a/command-list.txt b/command-list.txt
index a1fad28fd8..835c5890be 100644
--- a/command-list.txt
+++ b/command-list.txt
@@ -34,6 +34,7 @@ git-clean                               mainporcelain
 git-clone                               mainporcelain           init
 git-column                              purehelpers
 git-commit                              mainporcelain           history
+git-commit-graph                        plumbingmanipulators
 git-commit-tree                         plumbingmanipulators
 git-config                              ancillarymanipulators
 git-count-objects                       ancillaryinterrogators
diff --git a/git.c b/git.c
index c870b9719c..c7b5adae7b 100644
--- a/git.c
+++ b/git.c
@@ -388,6 +388,7 @@ static struct cmd_struct commands[] = {
 	{ "clone", cmd_clone },
 	{ "column", cmd_column, RUN_SETUP_GENTLY },
 	{ "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
+	{ "commit-graph", cmd_commit_graph, RUN_SETUP },
 	{ "commit-tree", cmd_commit_tree, RUN_SETUP },
 	{ "config", cmd_config, RUN_SETUP_GENTLY },
 	{ "count-objects", cmd_count_objects, RUN_SETUP },
-- 
2.16.0.15.g9c3cf44.dirty




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