grep: stop looking at random places for .gitattributes

grep searches for .gitattributes using "name" field in struct
grep_source but that field is not real on-disk path name. For example,
"grep pattern rev" fills the field with "rev:path", and Git looks for
.gitattributes in the (non-existent but exploitable) path "rev:path"
instead of "path".

This patch passes real paths down to grep_source_load_driver() when:

 - grep on work tree
 - grep on the index
 - grep a commit (or a tag if it points to a commit)

so that these cases look up .gitattributes at proper paths.
.gitattributes lookup is disabled in all other cases.

Initial-work-by: Jeff King <peff@peff.net>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
remote-curl: do not call run_slot repeatedly

Commit b81401c (http: prompt for credentials on failed POST)
taught post_rpc to call run_slot in a loop in order to retry
a request after asking the user for credentials. However,
after a call to run_slot we will have called
finish_active_slot. This means we have released the slot,
and we should no longer look at it.

As it happens, this does not cause any bugs in the current
code, since we know that we are not using curl_multi in this
code path, and therefore nobody will have taken over our
slot in the meantime. However, it is good form to actually
call get_active_slot again. It also future proofs us against
changes in the http code.

We can do this by jumping back to a retry label at the top
of our function. We just need to reorder a few setup lines
that should not be repeated; everything else within the loop
is either idempotent, needs to be repeated, or in a path we
do not follow (e.g., we do not even try when large_request
is set, because we don't know how much data we might have
streamed from our helper program).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
http: do not set up curl auth after a 401

When we get an http 401, we prompt for credentials and put
them in our global credential struct. We also feed them to
the curl handle that produced the 401, with the intent that
they will be used on a retry.

When the code was originally introduced in commit 42653c0,
this was a necessary step. However, since dfa1725, we always
feed our global credential into every curl handle when we
initialize the slot with get_active_slot. So every further
request already feeds the credential to curl.

Moreover, accessing the slot here is somewhat dubious. After
the slot has produced a response, we don't actually control
it any more.  If we are using curl_multi, it may even have
been re-initialized to handle a different request.

It just so happens that we will reuse the curl handle within
the slot in such a case, and that because we only keep one
global credential, it will be the one we want.  So the
current code is not buggy, but it is misleading.

By cleaning it up, we can remove the slot argument entirely
from handle_curl_result, making it much more obvious that
slots should not be accessed after they are marked as
finished.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
l10n: vi.po: update translation upto cc76011

* translate all new messages (100%)
* review some others

Signed-off-by: Tran Ngoc Quan <vnwildman@gmail.com>
Merge branch 'master' of git://github.com/vnwildman/git

* 'master' of git://github.com/vnwildman/git:
  l10n: vi.po: update translation upto cc76011
l10n: Update git.pot (3 new, 6 removed messages)

This po/git.pot update is generated from v1.8.0-rc2-4-g42e55.

Signed-off-by: Jiang Xin <worldhello.net@gmail.com>
Merge branch 'jk/maint-http-half-auth-push'

Fixes a regression in maint-1.7.11 (v1.7.11.7), maint (v1.7.12.1)
and master (v1.8.0-rc0).

* jk/maint-http-half-auth-push:
  http: fix segfault in handle_curl_result
Update draft release notes to 1.8.0

We are almost there...

Signed-off-by: Junio C Hamano <gitster@pobox.com>
Merge branch 'master' into next

* master:
  Update draft release notes to 1.8.0
  l10n: Update git.pot (3 new, 6 removed messages)
  l10n: vi.po: update translation upto cc76011
Merge branch 'jk/maint-http-init-not-in-result-handler' into next

Further clean-up to the http codepath that picks up results after
cURL library is done with one request slot.

* jk/maint-http-init-not-in-result-handler:
  http: do not set up curl auth after a 401
  remote-curl: do not call run_slot repeatedly
Merge branch 'nd/grep-true-path' into next

* nd/grep-true-path:
  grep: stop looking at random places for .gitattributes