[PATCH] Added hook in git-receive-pack

Just before updating a ref,

    $GIT_DIR/hooks/update refname old-sha1 new-sha1

is called if executable.  The hook can decline the ref to be
updated by exiting with a non-zero status, or allow it to be
updated by exiting with a zero status.  The mechanism also
allows e.g sending of a mail with pushed commits on the remote
repository.

Documentation update with an example hook is included.

jc: The credits of the basic idea and initial implementation go
to Josef, but I ended up rewriting major parts of his patch, so
bugs are all mine.  Also I changed the semantics for the hook
from his original version (which were post-update hook) so that
the hook can optionally decline to update the ref, and also can
be used to implement the overall cleanups.  The latter was
primarily to implement a suggestion from Linus that calling
update-server-info should be made optional.

Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 3 insertions, 0 deletions

diff --git a/Makefile b/Makefile
index 1b0ebb4ce8..b4aa706c77 100644
--- a/Makefile
+++ b/Makefile
@@ -98,6 +98,9 @@ LIB_OBJS=read-cache.o sha1_file.o usage.o object.o commit.o tree.o blob.o \
 LIB_H += rev-cache.h
 LIB_OBJS += rev-cache.o
 
+LIB_H += run-command.h
+LIB_OBJS += run-command.o
+
 LIB_H += strbuf.h
 LIB_OBJS += strbuf.o