Add git-index-pack utility

git-index-pack builds a pack index file for an existing packed
archive.  With this utility a packed archive which was transferred
without the corresponding pack index can be added to objects/pack/
without repacking.

Signed-off-by: Sergey Vlasov <vsu@altlinux.ru>
Signed-off-by: Junio C Hamano <junkio@cox.net>

Documentation/git-index-pack.txt

@@ -0,0 +1,44 @@
+git-index-pack(1)
+=================
+
+NAME
+----
+git-index-pack - Build pack index file for an existing packed archive
+
+
+SYNOPSIS
+--------
+'git-index-pack' [-o <index-file>] <pack-file>
+
+
+DESCRIPTION
+-----------
+Reads a packed archive (.pack) from the specified file, and
+builds a pack index file (.idx) for it.  The packed archive
+together with the pack index can then be placed in the
+objects/pack/ directory of a git repository.
+
+
+OPTIONS
+-------
+-o <index-file>::
+	Write the generated pack index into the specified
+	file.  Without this option the name of pack index
+	file is constructed from the name of packed archive
+	file by replacing .pack with .idx (and the program
+	fails if the name of packed archive does not end
+	with .pack).
+
+
+Author
+------
+Written by Sergey Vlasov <vsu@altlinux.ru>
+
+Documentation
+-------------
+Documentation by Sergey Vlasov
+
+GIT
+---
+Part of the gitlink:git[7] suite
+

Documentation/git.txt

@@ -68,6 +68,9 @@ gitlink:git-commit-tree[1]::
 gitlink:git-hash-object[1]::
 	Computes the object ID from a file.
 
+gitlink:git-index-pack.html[1]::
+	Build pack index file for an existing packed archive.
+
 gitlink:git-init-db[1]::
 	Creates an empty git object database
 

Makefile

@@ -110,7 +110,7 @@ PROGRAMS = \
 	git-convert-objects$X git-diff-files$X \
 	git-diff-index$X git-diff-stages$X \
 	git-diff-tree$X git-fetch-pack$X git-fsck-objects$X \
-	git-hash-object$X git-init-db$X \
+	git-hash-object$X git-index-pack$X git-init-db$X \
 	git-local-fetch$X git-ls-files$X git-ls-tree$X git-merge-base$X \
 	git-merge-index$X git-mktag$X git-pack-objects$X git-patch-id$X \
 	git-peek-remote$X git-prune-packed$X git-read-tree$X \