Merge branch 'jc/sideband' into jc/archive

* jc/sideband:
Prepare larger packet buffer for upload-pack protocol.
Move sideband server side support into reusable form.
Move sideband client side support into reusable form.
get_sha1_hex() micro-optimization

diff --combined Makefile
index 4ac85fdc7b1585746fbdb11bdcbfda3b70467085,a46cd52713a7adfccbb240f6696b20c1ce7bc370..c724b481a4426ed3336c12289eafdcb581c09e42
--- 1/Makefile
--- 2/Makefile
+++ b/Makefile
@@@ -232,8 -232,8 +232,8 @@@ LIB_FILE=libgit.
  XDIFF_LIB=xdiff/lib.a
  
  LIB_H = \
 -      blob.h cache.h commit.h csum-file.h delta.h \
 +      archive.h blob.h cache.h commit.h csum-file.h delta.h \
-       diff.h object.h pack.h pkt-line.h quote.h refs.h \
+       diff.h object.h pack.h pkt-line.h quote.h refs.h sideband.h \
        run-command.h strbuf.h tag.h tree.h git-compat-util.h revision.h \
        tree-walk.h log-tree.h dir.h path-list.h unpack-trees.h builtin.h
  
@@@ -245,7 -245,7 +245,7 @@@ DIFF_OBJS = 
  LIB_OBJS = \
        blob.o commit.o connect.o csum-file.o cache-tree.o base85.o \
        date.o diff-delta.o entry.o exec_cmd.o ident.o lockfile.o \
-       object.o pack-check.o patch-delta.o path.o pkt-line.o \
+       object.o pack-check.o patch-delta.o path.o pkt-line.o sideband.o \
        quote.o read-cache.o refs.o run-command.o dir.o object-refs.o \
        server-info.o setup.o sha1_file.o sha1_name.o strbuf.o \
        tag.o tree.o usage.o config.o environment.o ctype.o copy.o \
@@@ -256,7 -256,6 +256,7 @@@
  BUILTIN_OBJS = \
        builtin-add.o \
        builtin-apply.o \
 +      builtin-archive.o \
        builtin-cat-file.o \
        builtin-checkout-index.o \
        builtin-check-ref-format.o \
@@@ -293,7 -292,6 +293,7 @@@
        builtin-unpack-objects.o \
        builtin-update-index.o \
        builtin-update-ref.o \
 +      builtin-upload-archive.o \
        builtin-upload-tar.o \
        builtin-verify-pack.o \
        builtin-write-tree.o \