[RFC/PATCH] Add a new commit-raw command.

[Felipe Contreras <felipe.contreras@gmail.com>]

This command receives as input a raw commit object, and outputs the
generated sha1. This is very useful when doing some serious repo
reconstructions.

For example: git cat-file -p 343ee25 | git write-raw
343ee2589d1b94772f513cc699765622351acb19

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
---
 Makefile             |    1 +
 builtin-commit-raw.c |   23 +++++++++++++++++++++++
 builtin.h            |    1 +
 git.c                |    1 +
 4 files changed, 26 insertions(+), 0 deletions(-)
 create mode 100644 builtin-commit-raw.c

diff --git a/Makefile b/Makefile
index b040a96..94212b3 100644
--- a/Makefile
+++ b/Makefile
@@ -524,6 +524,7 @@ BUILTIN_OBJS += builtin-checkout-index.o
 BUILTIN_OBJS += builtin-checkout.o
 BUILTIN_OBJS += builtin-clean.o
 BUILTIN_OBJS += builtin-clone.o
+BUILTIN_OBJS += builtin-commit-raw.o
 BUILTIN_OBJS += builtin-commit-tree.o
 BUILTIN_OBJS += builtin-commit.o
 BUILTIN_OBJS += builtin-config.o
diff --git a/builtin-commit-raw.c b/builtin-commit-raw.c
new file mode 100644
index 0000000..66c41f4
--- /dev/null
+++ b/builtin-commit-raw.c
@@ -0,0 +1,23 @@
+/*
+ * Writes a raw commit object
+ */
+
+#include "cache.h"
+#include "commit.h"
+
+int cmd_commit_raw(int argc, const char **argv, const char *unused_prefix)
+{
+	unsigned char commit_sha1[20];
+	struct strbuf buffer;
+
+	strbuf_init(&buffer, 8192);
+
+	strbuf_read(&buffer, 0, 0);
+
+	if (!write_sha1_file(buffer.buf, buffer.len, "commit", commit_sha1)) {
+		printf("%s\n", sha1_to_hex(commit_sha1));
+		return 0;
+	}
+	else
+		return 1;
+}
diff --git a/builtin.h b/builtin.h
index 1495cf6..5c33e69 100644
--- a/builtin.h
+++ b/builtin.h
@@ -38,6 +38,7 @@ extern int cmd_cherry_pick(int argc, const char **argv, const char *prefix);
 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_commit(int argc, const char **argv, const char *prefix);
+extern int cmd_commit_raw(int argc, const char **argv, const char *prefix);
 extern int cmd_commit_tree(int argc, const char **argv, const char *prefix);
 extern int cmd_count_objects(int argc, const char **argv, const char *prefix);
 extern int cmd_describe(int argc, const char **argv, const char *prefix);
diff --git a/git.c b/git.c
index c2b181e..b033365 100644
--- a/git.c
+++ b/git.c
@@ -285,6 +285,7 @@ static void handle_internal_command(int argc, const char **argv)
 		{ "clone", cmd_clone },
 		{ "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
 		{ "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
+		{ "commit-raw", cmd_commit_raw, RUN_SETUP },
 		{ "commit-tree", cmd_commit_tree, RUN_SETUP },
 		{ "config", cmd_config },
 		{ "count-objects", cmd_count_objects, RUN_SETUP },
-- 
1.6.1.3