Mark http-fetch without -a as deprecated

As the use of http-fetch without -a can create an object store that is
invalid to the point where it cannot even be fsck'd, mark it as
deprecated.  A future release should change the default and then
remove the option entirely.

Signed-off-by: Ben Walton <bwalton@artsci.utoronto.ca>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-http-fetch.txt

diff --git a/Documentation/git-http-fetch.txt b/Documentation/git-http-fetch.txt
index 4d42073..070cd1e 100644
--- a/Documentation/git-http-fetch.txt
+++ b/Documentation/git-http-fetch.txt
@@ -15,6 +15,9 @@
 -----------
 Downloads a remote git repository via HTTP.
 
+*NOTE*: use of this command without -a is deprecated.  The -a
+behaviour will become the default in a future release.
+
 OPTIONS
 -------
 commit-id::

http-fetch.c

diff --git a/http-fetch.c b/http-fetch.c
index 3af4c71b..8c4c5d2 100644
--- a/http-fetch.c
+++ b/http-fetch.c
@@ -56,6 +56,10 @@
 		commits = 1;
 	}
 
+	if (get_all == 0)
+		warning("http-fetch: use without -a is deprecated.\n"
+			"In a future release, -a will become the default.");
+
 	if (argv[arg])
 		str_end_url_with_slash(argv[arg], &url);