[PATCH 0/4] Revisiting cache-tree

This series consists of a fix meant for maint branch, and two performance
fix.  The second one is a refactoring of the code to support the latter.

I was doing a rather huge import as a multi-step process by doing
something like this:

	$ rm -f $GIT_DIR/index
	$ git add some ;# this one is huge
	$ git tag one $(git write-tree)
	$ git repack -a -d
	$ rm -f $GIT_DIR/index
	$ git add other ;# this one is also huge
	$ git tag two $(git write-tree)
	$ git repack -a -d

	$ git read-tree some other
	$ git tag both $(git write-tree)
	$ git repack -a -d

The binding of two distinct subtrees is done with the read-tree but it
wrote out an incorrect index (notice the lack of -m; with -m option the
command correctly does a different thing) and resulted in a corrupt tree
object.

Junio C Hamano (4):
  read-tree A B: do not corrupt cache-tree
  Move prime_cache_tree() to cache-tree.c
  read-tree -m A B: prime cache-tree from the switched-to tree
  checkout branch: prime cache-tree fully

 builtin-checkout.c  |   10 +++++++++-
 builtin-read-tree.c |   48 ++++++++----------------------------------------
 cache-tree.c        |   34 ++++++++++++++++++++++++++++++++++
 cache-tree.h        |    4 ++++
 4 files changed, 55 insertions(+), 41 deletions(-)