[PATCH] Handle deltified object correctly in git-*-pull family.

When a remote repository is deltified, we need to get the
objects that a deltified object we want to obtain is based upon.
The initial parts of each retrieved SHA1 file is inflated and
inspected to see if it is deltified, and its base object is
asked from the remote side when it is.  Since this partial
inflation and inspection has a small performance hit, it can
optionally be skipped by giving -d flag to git-*-pull commands.
This flag should be used only when the remote repository is
known to have no deltified objects.

Rsync transport does not have this problem since it fetches
everything the remote side has.

Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Documentation/git-http-pull.txt

@@ -9,7 +9,7 @@ git-http-pull - Downloads a remote GIT repository via HTTP
 
 SYNOPSIS
 --------
-'git-http-pull' [-c] [-t] [-a] [-v] commit-id url
+'git-http-pull' [-c] [-t] [-a] [-v] [-d] commit-id url
 
 DESCRIPTION
 -----------
@@ -21,6 +21,10 @@ Downloads a remote GIT repository via HTTP.
 	Get trees associated with the commit objects.
 -a::
 	Get all the objects.
+-d::
+	Do not check for delta base objects (use this option
+	only when you know the remote repository is not
+	deltified).
 -v::
 	Report what is downloaded.
 

Documentation/git-local-pull.txt

@@ -9,7 +9,7 @@ git-local-pull - Duplicates another GIT repository on a local system
 
 SYNOPSIS
 --------
-'git-local-pull' [-c] [-t] [-a] [-l] [-s] [-n] [-v] commit-id path
+'git-local-pull' [-c] [-t] [-a] [-l] [-s] [-n] [-v] [-d] commit-id path
 
 DESCRIPTION
 -----------
@@ -23,6 +23,10 @@ OPTIONS
 	Get trees associated with the commit objects.
 -a::
 	Get all the objects.
+-d::
+	Do not check for delta base objects (use this option
+	only when you know the remote repository is not
+	deltified).
 -v::
 	Report what is downloaded.
 

Documentation/git-rpull.txt

@@ -10,7 +10,7 @@ git-rpull - Pulls from a remote repository over ssh connection
 
 SYNOPSIS
 --------
-'git-rpull' [-c] [-t] [-a] [-v] commit-id url
+'git-rpull' [-c] [-t] [-a] [-d] [-v] commit-id url
 
 DESCRIPTION
 -----------
@@ -25,6 +25,10 @@ OPTIONS
 	Get trees associated with the commit objects.
 -a::
 	Get all the objects.
+-d::
+	Do not check for delta base objects (use this option
+	only when you know the remote repository is not
+	deltified).
 -v::
 	Report what is downloaded.