Move most of the code from read_bundle_header() to parse_bundle_header()
that takes a file descriptor that is already opened for reading, and make
the former responsible only for opening the file and noticing errors.

As a logical consequence of this, is_bundle() helper function can be
implemented as a non-complaining variant of read_bundle_header() that
does not return an open file descriptor, and can be used to tighten
the check used to decide the use of bundle transport in transport_get()
function.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

We wished that "git bundle" to eventually learn to read from a network
socket which is not seekable. The current code opens with fopen(), reads
the file halfway and run ftell(), and reopens the same file with open()
and seeks, to skip the header.

This patch by itself does not reach that goal yet, but I think it is a
right step in that direction.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

Signed-off-by: Junio C Hamano <gitster@pobox.com>

* maint:
  completion: replace core.abbrevguard to core.abbrev

* maint-1.7.4:
  completion: replace core.abbrevguard to core.abbrev

The core.abbrevguard config variable had removed and
now core.abbrev has been used instead. Teach it.

Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Signed-off-by: Junio C Hamano <gitster@pobox.com>

* maint:
  Documentation: git diff --check respects core.whitespace

Fix documentation on "git diff --check" by adopting the description from
"git apply --whitespace".

Signed-off-by: Christof Krüger <git@christof-krueger.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

* maint:
  gitweb: 'pickaxe' and 'grep' features requires 'search' to be enabled