repack: add -F flag to let user choose between --no-reuse-delta/object

In 479b56b ('make "repack -f" imply "pack-objects --no-reuse-object"'),
git repack -f was changed to include recompressing all objects on the
zlib level on the assumption that if the user wants to spend that much
time already, some more time won't hurt (and recompressing is useful if
the user changed the zlib compression level).

However, "some more time" can be quite long with very big repositories,
so some users are going to appreciate being able to choose. If we are
going to give them the choice, --no-reuse-object will probably be
interesting a lot less frequently than --no-reuse-delta. Hence, this
reverts -f to the old behaviour (--no-reuse-delta) and adds a new -F
option that replaces the current -f.

Measurements taken using this patch on a current clone of git.git
indicate a 17% decrease in time being made available to users:

git repack -Adf  34.84s user 0.56s system 145% cpu 24.388 total
git repack -AdF  38.79s user 0.56s system 133% cpu 29.394 total

Signed-off-by: Jan Krüger <jk@jk.gs>
Acked-by: Nicolas Pitre <nico@fluxnic.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-repack.txt

@@ -8,7 +8,7 @@ git-repack - Pack unpacked objects in a repository
 
 SYNOPSIS
 --------
-'git repack' [-a] [-A] [-d] [-f] [-l] [-n] [-q] [--window=N] [--depth=N]
+'git repack' [-a] [-A] [-d] [-f] [-F] [-l] [-n] [-q] [--window=N] [--depth=N]
 
 DESCRIPTION
 -----------
@@ -62,6 +62,10 @@ other objects in that pack they already have locally.
 	linkgit:git-pack-objects[1].
 
 -f::
+	Pass the `--no-reuse-delta` option to `git-pack-objects`, see
+	linkgit:git-pack-objects[1].
+
+-F::
 	Pass the `--no-reuse-object` option to `git-pack-objects`, see
 	linkgit:git-pack-objects[1].
 

git-repack.sh

@@ -10,7 +10,8 @@ git repack [options]
 a               pack everything in a single pack
 A               same as -a, and turn unreachable objects loose
 d               remove redundant packs, and run git-prune-packed
-f               pass --no-reuse-object to git-pack-objects
+f               pass --no-reuse-delta to git-pack-objects
+F               pass --no-reuse-object to git-pack-objects
 n               do not run git-update-server-info
 q,quiet         be quiet
 l               pass --local to git-pack-objects
@@ -34,7 +35,8 @@ do
 		unpack_unreachable=--unpack-unreachable ;;
 	-d)	remove_redundant=t ;;
 	-q)	GIT_QUIET=t ;;
-	-f)	no_reuse=--no-reuse-object ;;
+	-f)	no_reuse=--no-reuse-delta ;;
+	-F)	no_reuse=--no-reuse-object ;;
 	-l)	local=--local ;;
 	--max-pack-size|--window|--window-memory|--depth)
 		extra="$extra $1=$2"; shift ;;