commit-graph: create git-commit-graph builtin

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 an '--object-dir' option. Signed-off-by: Derrick Stolee <dstolee@microsoft.com>

Author: derrickstolee

.gitignore

@@ -34,6 +34,7 @@
 /git-clone
 /git-column
 /git-commit
+/git-commit-graph
 /git-commit-tree
 /git-config
 /git-count-objects

Documentation/git-commit-graph.txt

@@ -0,0 +1,10 @@
+git-commit-graph(1)
+===================
+
+NAME
+----
+git-commit-graph - Write and verify Git commit graph files
+
+GIT
+---
+Part of the linkgit:git[1] suite

Makefile

@@ -952,6 +952,7 @@ BUILTIN_OBJS += builtin/clone.o
 BUILTIN_OBJS += builtin/column.o
 BUILTIN_OBJS += builtin/commit-tree.o
 BUILTIN_OBJS += builtin/commit.o
+BUILTIN_OBJS += builtin/commit-graph.o
 BUILTIN_OBJS += builtin/config.o
 BUILTIN_OBJS += builtin/count-objects.o
 BUILTIN_OBJS += builtin/credential.o

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);

builtin/commit-graph.c

@@ -0,0 +1,36 @@
+#include "builtin.h"
+#include "config.h"
+#include "parse-options.h"
+
+static char const * const builtin_commit_graph_usage[] = {
+N_("git commit-graph [--object-dir <objdir>]"),
+NULL
+};
+
+static struct opts_commit_graph {
+const char *obj_dir;
+} opts;
+
+
+int cmd_commit_graph(int argc, const char **argv, const char *prefix)
+{
+static struct option builtin_commit_graph_options[] = {
+OPT_STRING(0, "object-dir", &opts.obj_dir,
+N_("dir"),
+N_("The object 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);
+
+git_config(git_default_config, NULL);
+argc = parse_options(argc, argv, prefix,
+ builtin_commit_graph_options,
+ builtin_commit_graph_usage,
+ PARSE_OPT_STOP_AT_NON_OPTION);
+
+usage_with_options(builtin_commit_graph_usage,
+ builtin_commit_graph_options);
+}

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

contrib/completion/git-completion.bash

@@ -878,6 +878,7 @@ __git_list_porcelain_commands ()
 check-ref-format) : plumbing;;
 checkout-index) : plumbing;;
 column) : internal helper;;
+commit-graph) : plumbing;;
 commit-tree) : plumbing;;
 count-objects) : infrequent;;
 credential) : credentials;;
@@ -2350,6 +2351,7 @@ _git_config ()
 core.bigFileThreshold
 core.checkStat
 core.commentChar
+core.commitGraph
 core.compression
 core.createObject
 core.deltaBaseCacheLimit

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 | DELAY_PAGER_CONFIG },
 { "count-objects", cmd_count_objects, RUN_SETUP },