[PATCH v4 4/6] update-index: use the bulk-checkin infrastructure

From: Neeraj Singh <redacted>

The update-index functionality is used internally by 'git stash push' to
setup the internal stashed commit.

This change enables bulk-checkin for update-index infrastructure to
speed up adding new objects to the object database by leveraging the
pack functionality and the new bulk-fsync functionality. This mode
is enabled when passing paths to update-index via the --stdin flag,
as is done by 'git stash'.

There is some risk with this change, since under batch fsync, the object
files will not be available until the update-index is entirely complete.
This usage is unlikely, since any tool invoking update-index and
expecting to see objects would have to snoop the output of --verbose to
find out when update-index has actually processed a given path.
Additionally the index is locked for the duration of the update.

Signed-off-by: Neeraj Singh <redacted>
---
 builtin/update-index.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/builtin/update-index.c b/builtin/update-index.c
index 187203e8bb5..b0689f2cdf6 100644
--- a/builtin/update-index.c
+++ b/builtin/update-index.c

@@ -5,6 +5,7 @@
  */
 #define USE_THE_INDEX_COMPATIBILITY_MACROS
 #include "cache.h"
+#include "bulk-checkin.h"
 #include "config.h"
 #include "lockfile.h"
 #include "quote.h"

@@ -1150,6 +1151,7 @@ int cmd_update_index(int argc, const char **argv, const char *prefix)
 		struct strbuf unquoted = STRBUF_INIT;
 
 		setup_work_tree();
+		plug_bulk_checkin();
 		while (getline_fn(&buf, stdin) != EOF) {
 			char *p;
 			if (!nul_term_line && buf.buf[0] == '"') {

@@ -1164,6 +1166,7 @@ int cmd_update_index(int argc, const char **argv, const char *prefix)
 				chmod_path(set_executable_bit, p);
 			free(p);
 		}
+		unplug_bulk_checkin(&lock_file);
 		strbuf_release(&unquoted);
 		strbuf_release(&buf);
 	}

-- 
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