[PATCH 2/2] update-index: upgrade/downgrade on-disk index version

From

Junio C Hamano <gitster@pobox.com>

Date

Apr 4, 2012, 16:58 UTC

Message-ID

<7vty0za0xn.fsf_-_@alter.siamese.dyndns.org>

In-Reply-To

<7vy5qba10j.fsf@alter.siamese.dyndns.org>

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 * And this is the second of the two-patch series to replace 9/9 from
   yesterday's series.

 Documentation/git-update-index.txt |    6 +++++-
 builtin/update-index.c             |   14 ++++++++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/Documentation/git-update-index.txt b/Documentation/git-update-index.txt
index a3081f4..fd9103b 100644
--- a/Documentation/git-update-index.txt
+++ b/Documentation/git-update-index.txt
@@ -19,7 +19,7 @@ SYNOPSIS
 	     [--ignore-submodules]
 	     [--really-refresh] [--unresolve] [--again | -g]
 	     [--info-only] [--index-info]
-	     [-z] [--stdin]
+	     [-z] [--stdin] [--index-version <n>]
 	     [--verbose]
 	     [--] [<file>...]
 
@@ -143,6 +143,10 @@ you will need to handle the situation manually.
 --verbose::
         Report what is being added and removed from index.
 
+--index-version <n>::
+	Write the resulting index out in the named on-disk format version.
+	The current default version is 2.
+
 -z::
 	Only meaningful with `--stdin` or `--index-info`; paths are
 	separated with NUL character instead of LF.
diff --git a/builtin/update-index.c b/builtin/update-index.c
index a6a23fa..5f038d6 100644
--- a/builtin/update-index.c
+++ b/builtin/update-index.c
@@ -708,6 +708,7 @@ int cmd_update_index(int argc, const char **argv, const char *prefix)
 	int newfd, entries, has_errors = 0, line_termination = '\n';
 	int read_from_stdin = 0;
 	int prefix_length = prefix ? strlen(prefix) : 0;
+	int preferred_index_format = 0;
 	char set_executable_bit = 0;
 	struct refresh_params refresh_args = {0, &has_errors};
 	int lock_error = 0;
@@ -791,6 +792,8 @@ int cmd_update_index(int argc, const char **argv, const char *prefix)
 			"(for porcelains) forget saved unresolved conflicts",
 			PARSE_OPT_NOARG | PARSE_OPT_NONEG,
 			resolve_undo_clear_callback},
+		OPT_INTEGER(0, "index-version", &preferred_index_format,
+			    "write index in this format"),
 		OPT_END()
 	};
 
@@ -851,6 +854,17 @@ int cmd_update_index(int argc, const char **argv, const char *prefix)
 		}
 	}
 	argc = parse_options_end(&ctx);
+	if (preferred_index_format) {
+		if (preferred_index_format < INDEX_FORMAT_LB ||
+		    INDEX_FORMAT_UB < preferred_index_format)
+			die("index-version %d not in range: %d..%d",
+			    preferred_index_format,
+			    INDEX_FORMAT_LB, INDEX_FORMAT_UB);
+
+		if (the_index.version != preferred_index_format)
+			active_cache_changed = 1;
+		the_index.version = preferred_index_format;
+	}
 
 	if (read_from_stdin) {
 		struct strbuf buf = STRBUF_INIT, nbuf = STRBUF_INIT;

-- 
1.7.10.rc4.54.g1d5dd3