[PATCH 1/2] pack-objects: document --delta-base-offset option
Signed-off-by: Junio C Hamano <junkio@cox.net>
---
Documentation/git-pack-objects.txt | 13 ++++++++++++-
builtin-pack-objects.c | 2 +-
2 files changed, 13 insertions(+), 2 deletions(-)
diff --git a/Documentation/git-pack-objects.txt b/Documentation/git-pack-objects.txt
index d4661dd..5788709 100644
--- a/Documentation/git-pack-objects.txt
+++ b/Documentation/git-pack-objects.txt
@@ -9,7 +9,7 @@ git-pack-objects - Create a packed archi
SYNOPSIS
--------
[verse]
-'git-pack-objects' [-q] [--no-reuse-delta] [--non-empty]
+'git-pack-objects' [-q] [--no-reuse-delta] [--delta-base-offset] [--non-empty]
[--local] [--incremental] [--window=N] [--depth=N]
[--revs [--unpacked | --all]*] [--stdout | base-name] < object-list
@@ -110,6 +110,17 @@ base-name::
This flag tells the command not to reuse existing deltas
but compute them from scratch.
+--delta-base-offset::
+ A packed archive can express base object of a delta as
+ either 20-byte object name or as an offset in the
+ stream, but older version of git does not understand the
+ latter. By default, git-pack-objects only uses the
+ former format for better compatibility. This option
+ allows the command to use the latter format for
+ compactness. Depending on the average delta chain
+ length, this option typically shrinks the resulting
+ packfile by 3-5 per-cent.
+
Author
------
diff --git a/builtin-pack-objects.c b/builtin-pack-objects.c
index ee5f031..41e1e74 100644
--- a/builtin-pack-objects.c
+++ b/builtin-pack-objects.c
@@ -15,7 +15,7 @@ #include "list-objects.h"
#include <sys/time.h>
#include <signal.h>
-static const char pack_usage[] = "git-pack-objects [-q] [--no-reuse-delta] [--non-empty] [--local] [--incremental] [--window=N] [--depth=N] [--revs [--unpacked | --all]*] [--stdout | base-name] <ref-list | <object-list]";
+static const char pack_usage[] = "git-pack-objects [-q] [--no-reuse-delta] [--delta-base-offset] [--non-empty] [--local] [--incremental] [--window=N] [--depth=N] [--revs [--unpacked | --all]*] [--stdout | base-name] <ref-list | <object-list]";
struct object_entry {
unsigned char sha1[20];
--
1.4.3.rc2.g51ca
Junio C Hamano <junkio@cox.net>