git.git
13 years agoMerge branch 'jn/test-cleanup-7006'
Junio C Hamano [Thu, 22 Dec 2011 19:27:24 +0000 (11:27 -0800)]
Merge branch 'jn/test-cleanup-7006'

* jn/test-cleanup-7006:
  test: errors preparing for a test are not special

13 years agoMerge branch 'ef/setenv-putenv'
Junio C Hamano [Thu, 22 Dec 2011 19:27:24 +0000 (11:27 -0800)]
Merge branch 'ef/setenv-putenv'

* ef/setenv-putenv:
  compat/setenv.c: error if name contains '='
  compat/setenv.c: update errno when erroring out

13 years agoMerge branch 'jk/git-prompt'
Junio C Hamano [Thu, 22 Dec 2011 19:27:23 +0000 (11:27 -0800)]
Merge branch 'jk/git-prompt'

* jk/git-prompt:
  contrib: add credential helper for OS X Keychain
  Makefile: OS X has /dev/tty
  Makefile: linux has /dev/tty
  credential: use git_prompt instead of git_getpass
  prompt: use git_terminal_prompt
  add generic terminal prompt function
  refactor git_getpass into generic prompt function
  move git_getpass to its own source file
  imap-send: don't check return value of git_getpass
  imap-send: avoid buffer overflow

Conflicts:
Makefile

13 years agoMerge branch 'jk/http-push-to-empty'
Junio C Hamano [Thu, 22 Dec 2011 19:27:22 +0000 (11:27 -0800)]
Merge branch 'jk/http-push-to-empty'

* jk/http-push-to-empty:
  remote-curl: don't pass back fake refs

Conflicts:
remote-curl.c

13 years agoSync with v1.7.8.1
Junio C Hamano [Wed, 21 Dec 2011 20:02:39 +0000 (12:02 -0800)]
Sync with v1.7.8.1

13 years agoGit 1.7.8.1 v1.7.8.1
Junio C Hamano [Wed, 21 Dec 2011 20:02:13 +0000 (12:02 -0800)]
Git 1.7.8.1

Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agoMerge branch 'jl/submodule-status-failure-report' into maint
Junio C Hamano [Wed, 21 Dec 2011 19:42:45 +0000 (11:42 -0800)]
Merge branch 'jl/submodule-status-failure-report' into maint

* jl/submodule-status-failure-report:
  diff/status: print submodule path when looking for changes fails

13 years agoMerge branch 'tr/userdiff-c-returns-pointer' into maint
Junio C Hamano [Wed, 21 Dec 2011 19:42:45 +0000 (11:42 -0800)]
Merge branch 'tr/userdiff-c-returns-pointer' into maint

* tr/userdiff-c-returns-pointer:
  userdiff: allow * between cpp funcname words

13 years agoMerge branch 'bc/maint-apply-check-no-patch' into maint
Junio C Hamano [Wed, 21 Dec 2011 19:42:45 +0000 (11:42 -0800)]
Merge branch 'bc/maint-apply-check-no-patch' into maint

* bc/maint-apply-check-no-patch:
  builtin/apply.c: report error on failure to recognize input
  t/t4131-apply-fake-ancestor.sh: fix broken test

13 years agoMerge branch 'cn/maint-lf-to-crlf-filter' into maint
Junio C Hamano [Wed, 21 Dec 2011 19:42:44 +0000 (11:42 -0800)]
Merge branch 'cn/maint-lf-to-crlf-filter' into maint

* cn/maint-lf-to-crlf-filter:
  lf_to_crlf_filter(): tell the caller we added "\n" when draining
  convert: track state in LF-to-CRLF filter

13 years agoMerge branch 'jk/maint-upload-archive' into maint
Junio C Hamano [Wed, 21 Dec 2011 19:42:44 +0000 (11:42 -0800)]
Merge branch 'jk/maint-upload-archive' into maint

* jk/maint-upload-archive:
  archive: don't let remote clients get unreachable commits

13 years agoclone: the -o option has nothing to do with <branch>
Carlos Martín Nieto [Wed, 21 Dec 2011 18:14:09 +0000 (18:14 +0000)]
clone: the -o option has nothing to do with <branch>

It is to give an alternate <name> instead of "origin" to the remote
we are cloning from.

Signed-off-by: Carlos Martín Nieto <cmn@elego.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agobuiltin/log: remove redundant initialization
Michael Schubert [Wed, 21 Dec 2011 12:05:27 +0000 (13:05 +0100)]
builtin/log: remove redundant initialization

"abbrev" and "commit_format" in struct rev_info get initialized in
init_revisions - no need to reinit in cmd_log_init_defaults.

Signed-off-by: Michael Schubert <mschub@elegosoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agoMerge branch 'ms/commit-cc-option-helpstring' into maint
Junio C Hamano [Wed, 21 Dec 2011 18:50:20 +0000 (10:50 -0800)]
Merge branch 'ms/commit-cc-option-helpstring' into maint

* ms/commit-cc-option-helpstring:
  builtin/commit: add missing '/' in help message

13 years agobuiltin/commit: add missing '/' in help message
Michael Schubert [Wed, 21 Dec 2011 14:56:00 +0000 (15:56 +0100)]
builtin/commit: add missing '/' in help message

Signed-off-by: Michael Schubert <mschub@elegosoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agoMerge branch 'maint'
Junio C Hamano [Wed, 21 Dec 2011 00:34:20 +0000 (16:34 -0800)]
Merge branch 'maint'

* maint:
  builtin/init-db.c: eliminate -Wformat warning on Solaris

13 years agobuiltin/init-db.c: eliminate -Wformat warning on Solaris
Ævar Arnfjörð Bjarmason [Tue, 20 Dec 2011 23:27:41 +0000 (23:27 +0000)]
builtin/init-db.c: eliminate -Wformat warning on Solaris

On Solaris systems we'd warn about an implicit cast of mode_t when we
printed things out with the %d format. We'd get this warning under GCC
4.6.0 with Solaris headers:

    builtin/init-db.c: In function ‘separate_git_dir’:
    builtin/init-db.c:354:4: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘mode_t’ [-Wformat]

We've been doing this ever since v1.7.4.1-296-gb57fb80. Just work
around this by adding an explicit cast.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agoMerge branch 'mh/ref-api'
Junio C Hamano [Tue, 20 Dec 2011 21:25:53 +0000 (13:25 -0800)]
Merge branch 'mh/ref-api'

* mh/ref-api:
  add_ref(): take a (struct ref_entry *) parameter
  create_ref_entry(): extract function from add_ref()
  repack_without_ref(): remove temporary
  resolve_gitlink_ref_recursive(): change to work with struct ref_cache
  Pass a (ref_cache *) to the resolve_gitlink_*() helper functions
  resolve_gitlink_ref(): improve docstring
  get_ref_dir(): change signature
  refs: change signatures of get_packed_refs() and get_loose_refs()
  is_dup_ref(): extract function from sort_ref_array()
  add_ref(): add docstring
  parse_ref_line(): add docstring
  is_refname_available(): remove the "quiet" argument
  clear_ref_array(): rename from free_ref_array()
  refs: rename parameters result -> sha1
  refs: rename "refname" variables
  struct ref_entry: document name member

Conflicts:
cache.h
refs.c

13 years agoMerge branch 'jc/advice-doc'
Junio C Hamano [Tue, 20 Dec 2011 21:25:29 +0000 (13:25 -0800)]
Merge branch 'jc/advice-doc'

* jc/advice-doc:
  advice: Document that they all default to true

13 years agoMerge branch 'jc/request-pull-show-head-4'
Junio C Hamano [Tue, 20 Dec 2011 21:25:27 +0000 (13:25 -0800)]
Merge branch 'jc/request-pull-show-head-4'

* jc/request-pull-show-head-4:
  request-pull: do not emit "tag" before the tagname
  request-pull: update the "pull" command generation logic

13 years agoMerge branch 'jc/pull-signed-tag'
Junio C Hamano [Tue, 20 Dec 2011 21:24:12 +0000 (13:24 -0800)]
Merge branch 'jc/pull-signed-tag'

* jc/pull-signed-tag:
  commit: do not lose mergetag header when not amending

13 years agoMerge branch 'jc/checkout-m-twoway'
Junio C Hamano [Tue, 20 Dec 2011 21:24:08 +0000 (13:24 -0800)]
Merge branch 'jc/checkout-m-twoway'

* jc/checkout-m-twoway:
  t/t2023-checkout-m.sh: fix use of test_must_fail

13 years agot/t2023-checkout-m.sh: fix use of test_must_fail
Ævar Arnfjörð Bjarmason [Tue, 20 Dec 2011 20:37:45 +0000 (20:37 +0000)]
t/t2023-checkout-m.sh: fix use of test_must_fail

Change an invocation of test_must_fail() to be inside a
test_expect_success() as is our usual pattern. Having it outside
caused our tests to fail under prove(1) since we wouldn't print a
newline before TAP output:

    CONFLICT (content): Merge conflict in both.txt
    # GETTEXT POISON #ok 2 - -m restores 2-way conflicted+resolved file

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agocommit: do not lose mergetag header when not amending
Junio C Hamano [Tue, 20 Dec 2011 21:20:56 +0000 (13:20 -0800)]
commit: do not lose mergetag header when not amending

The earlier ed7a42a (commit: teach --amend to carry forward extra headers,
2011-11-08) broke "git merge/pull; edit to fix conflict; git commit"
workflow by forgetting that commit_tree_extended() takes the whole extra
header list.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agoMerge branch 'tr/cache-tree'
Junio C Hamano [Tue, 20 Dec 2011 20:16:04 +0000 (12:16 -0800)]
Merge branch 'tr/cache-tree'

* tr/cache-tree:
  t0090: be prepared that 'wc -l' writes leading blanks

13 years agot0090: be prepared that 'wc -l' writes leading blanks
Johannes Sixt [Tue, 20 Dec 2011 08:24:21 +0000 (09:24 +0100)]
t0090: be prepared that 'wc -l' writes leading blanks

Use 'printf %d $(whatever|wc -l)' so that the shell removes the blanks
for us.

Signed-off-by: Johannes Sixt <j6t@kdbg.org>
Acked-by: Thomas Rast <trast@student.ethz.ch>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agoUpdate draft release notes to 1.7.9
Junio C Hamano [Tue, 20 Dec 2011 00:39:54 +0000 (16:39 -0800)]
Update draft release notes to 1.7.9

Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agoMerge branch 'ab/enable-i18n'
Junio C Hamano [Tue, 20 Dec 2011 00:06:41 +0000 (16:06 -0800)]
Merge branch 'ab/enable-i18n'

* ab/enable-i18n:
  i18n: add infrastructure for translating Git with gettext

Conflicts:
Makefile

13 years agoMerge branch 'ew/keepalive'
Junio C Hamano [Tue, 20 Dec 2011 00:06:32 +0000 (16:06 -0800)]
Merge branch 'ew/keepalive'

* ew/keepalive:
  enable SO_KEEPALIVE for connected TCP sockets

13 years agoMerge branch 'jc/checkout-m-twoway'
Junio C Hamano [Tue, 20 Dec 2011 00:06:22 +0000 (16:06 -0800)]
Merge branch 'jc/checkout-m-twoway'

* jc/checkout-m-twoway:
  checkout_merged(): squelch false warning from some gcc
  Test 'checkout -m -- path'
  checkout -m: no need to insist on having all 3 stages

13 years agoMerge branch 'jk/maint-push-over-dav'
Junio C Hamano [Tue, 20 Dec 2011 00:05:59 +0000 (16:05 -0800)]
Merge branch 'jk/maint-push-over-dav'

* jk/maint-push-over-dav:
  http-push: enable "proactive auth"
  t5540: test DAV push with authentication

Conflicts:
http.c

13 years agoMerge branch 'jk/fetch-no-tail-match-refs'
Junio C Hamano [Tue, 20 Dec 2011 00:05:55 +0000 (16:05 -0800)]
Merge branch 'jk/fetch-no-tail-match-refs'

* jk/fetch-no-tail-match-refs:
  connect.c: drop path_match function
  fetch-pack: match refs exactly
  t5500: give fully-qualified refs to fetch-pack
  drop "match" parameter from get_remote_heads

13 years agoMerge branch 'nd/resolve-ref'
Junio C Hamano [Tue, 20 Dec 2011 00:05:50 +0000 (16:05 -0800)]
Merge branch 'nd/resolve-ref'

* nd/resolve-ref:
  Rename resolve_ref() to resolve_ref_unsafe()
  Convert resolve_ref+xstrdup to new resolve_refdup function
  revert: convert resolve_ref() to read_ref_full()

13 years agoMerge branch 'jn/maint-sequencer-fixes'
Junio C Hamano [Tue, 20 Dec 2011 00:05:45 +0000 (16:05 -0800)]
Merge branch 'jn/maint-sequencer-fixes'

* jn/maint-sequencer-fixes:
  revert: stop creating and removing sequencer-old directory
  Revert "reset: Make reset remove the sequencer state"
  revert: do not remove state until sequence is finished
  revert: allow single-pick in the middle of cherry-pick sequence
  revert: pass around rev-list args in already-parsed form
  revert: allow cherry-pick --continue to commit before resuming
  revert: give --continue handling its own function

13 years agoMerge branch 'jk/maint-snprintf-va-copy'
Junio C Hamano [Tue, 20 Dec 2011 00:05:38 +0000 (16:05 -0800)]
Merge branch 'jk/maint-snprintf-va-copy'

* jk/maint-snprintf-va-copy:
  compat/snprintf: don't look at va_list twice

13 years agoMerge branch 'jk/maint-mv'
Junio C Hamano [Tue, 20 Dec 2011 00:05:34 +0000 (16:05 -0800)]
Merge branch 'jk/maint-mv'

* jk/maint-mv:
  mv: be quiet about overwriting
  mv: improve overwrite warning
  mv: make non-directory destination error more clear
  mv: honor --verbose flag
  docs: mention "-k" for both forms of "git mv"

13 years agoMerge branch 'ci/stripspace-docs'
Junio C Hamano [Tue, 20 Dec 2011 00:05:31 +0000 (16:05 -0800)]
Merge branch 'ci/stripspace-docs'

* ci/stripspace-docs:
  Update documentation for stripspace

13 years agoMerge branch 'rr/test-chaining'
Junio C Hamano [Tue, 20 Dec 2011 00:05:25 +0000 (16:05 -0800)]
Merge branch 'rr/test-chaining'

* rr/test-chaining:
  t3401: use test_commit in setup
  t3401: modernize style
  t3040 (subprojects-basic): fix '&&' chaining, modernize style
  t1510 (worktree): fix '&&' chaining
  t3030 (merge-recursive): use test_expect_code
  test: fix '&&' chaining
  t3200 (branch): fix '&&' chaining

13 years agoMerge branch 'tr/cache-tree'
Junio C Hamano [Tue, 20 Dec 2011 00:05:20 +0000 (16:05 -0800)]
Merge branch 'tr/cache-tree'

* tr/cache-tree:
  reset: update cache-tree data when appropriate
  commit: write cache-tree data when writing index anyway
  Refactor cache_tree_update idiom from commit
  Test the current state of the cache-tree optimization
  Add test-scrap-cache-tree

13 years agoMerge branch 'jk/credentials'
Junio C Hamano [Tue, 20 Dec 2011 00:05:16 +0000 (16:05 -0800)]
Merge branch 'jk/credentials'

* jk/credentials:
  t: add test harness for external credential helpers
  credentials: add "store" helper
  strbuf: add strbuf_add*_urlencode
  Makefile: unix sockets may not available on some platforms
  credentials: add "cache" helper
  docs: end-user documentation for the credential subsystem
  credential: make relevance of http path configurable
  credential: add credential.*.username
  credential: apply helper config
  http: use credential API to get passwords
  credential: add function for parsing url components
  introduce credentials API
  t5550: fix typo
  test-lib: add test_config_global variant

Conflicts:
strbuf.c

13 years agorequest-pull: do not emit "tag" before the tagname
Junio C Hamano [Mon, 19 Dec 2011 19:59:57 +0000 (11:59 -0800)]
request-pull: do not emit "tag" before the tagname

The whole point of the recent update to allow "git pull $url $tagname" is
so that the integrator does not have to store the (signed) tag that is
used to convey authenticity to be recorded in the resulting merge in the
local repository's tag namespace.  Asking for a merge be made with "git
pull $url tag $tagname" defeats it.

Note that the request can become ambiguous if the requestor has a branch
with the same name as the tag, but that is not a new problem limited to
pulling. I wouldn't mind if somebody wants to add disambiguation to the
find_matching_ref logic in the script as a separate patch, though.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agoremote-curl: don't pass back fake refs
Jeff King [Sat, 17 Dec 2011 10:45:39 +0000 (05:45 -0500)]
remote-curl: don't pass back fake refs

When receive-pack advertises its list of refs, it generally hides the
capabilities information after a NUL at the end of the first ref.

However, when we have an empty repository, there are no refs, and
therefore receive-pack writes a fake ref "capabilities^{}" with the
capabilities afterwards.

On the client side, git reads the result with get_remote_heads(). We pick
the capabilities from the end of the line, and then call check_ref() to
make sure the ref name is valid. We see that it isn't, and don't bother
adding it to our list of refs.

However, the call to check_ref() is enabled by passing the REF_NORMAL flag
to get_remote_heads. For the regular git transport, we pass REF_NORMAL in
get_refs_via_connect() if we are doing a push (since only receive-pack
uses this fake ref).  But in remote-curl, we never use this flag, and we
accept the fake ref as a real one, passing it back from the helper to the
parent git-push.

Most of the time this bug goes unnoticed, as the fake ref won't match our
refspecs. However, if "--mirror" is used, then we see it as remote cruft
to be pruned, and try to pass along a deletion refspec for it. Of course
this refspec has bogus syntax (because of the ^{}), and the helper
complains, aborting the push.

Let's have remote-curl mirror what the builtin get_refs_via_connect() does
(at least for the case of using git protocol; we can leave the dumb
info/refs reader as it is).

This also fixes pushing with --mirror to a smart-http remote that uses
alternates. The fake ".have" refs the server gives to avoid unnecessary
network transfer has a similar bad interactions with the machinery.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agoadvice: Document that they all default to true
Junio C Hamano [Mon, 19 Dec 2011 05:35:01 +0000 (21:35 -0800)]
advice: Document that they all default to true

By definition, the default value of "advice.*" variables must be true and
they all control various additional help messages that are designed to aid
new users. Setting one to false is to tell Git that the user understands
the nature of the error and does not need the additional verbose help
message.

Also fix the asciidoc markup for linkgit:git-checkout[1] in the
description of the detachedHead advice by removing an excess colon.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agogit-p4: fix skipSubmitEdit regression
Pete Wyckoff [Sat, 17 Dec 2011 17:39:03 +0000 (12:39 -0500)]
git-p4: fix skipSubmitEdit regression

Commit 7c766e5 (git-p4: introduce skipSubmitEdit, 2011-12-04)
made it easier to automate submission to p4, but broke the most
common case.

Add a test for when the user really does edit and save the change
template, and fix the bug that causes the test to fail.

Also add a confirmation message when submission is cancelled.

Reported-by: Michael Horowitz <michael.horowitz@ieee.org>
Signed-off-by: Pete Wyckoff <pw@padd.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agoUpdate draft release notes to 1.7.9
Junio C Hamano [Sat, 17 Dec 2011 06:45:03 +0000 (22:45 -0800)]
Update draft release notes to 1.7.9

Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agoMerge branch 'jc/commit-amend-no-edit'
Junio C Hamano [Sat, 17 Dec 2011 06:33:56 +0000 (22:33 -0800)]
Merge branch 'jc/commit-amend-no-edit'

* jc/commit-amend-no-edit:
  test: commit --amend should honor --no-edit
  commit: honour --no-edit
  t7501 (commit): modernize style
  test: remove a porcelain test that hard-codes commit names
  test: add missing "&&" after echo command

13 years agoMerge branch 'jc/stream-to-pack'
Junio C Hamano [Sat, 17 Dec 2011 06:33:40 +0000 (22:33 -0800)]
Merge branch 'jc/stream-to-pack'

* jc/stream-to-pack:
  bulk-checkin: replace fast-import based implementation
  csum-file: introduce sha1file_checkpoint
  finish_tmp_packfile(): a helper function
  create_tmp_packfile(): a helper function
  write_pack_header(): a helper function

Conflicts:
pack.h

13 years agoMerge branch 'aw/rebase-i-stop-on-failure-to-amend'
Junio C Hamano [Sat, 17 Dec 2011 06:33:37 +0000 (22:33 -0800)]
Merge branch 'aw/rebase-i-stop-on-failure-to-amend'

* aw/rebase-i-stop-on-failure-to-amend:
  rebase -i: interrupt rebase when "commit --amend" failed during "reword"

13 years agoMerge branch 'jh/fast-import-notes'
Junio C Hamano [Sat, 17 Dec 2011 06:33:34 +0000 (22:33 -0800)]
Merge branch 'jh/fast-import-notes'

* jh/fast-import-notes:
  fast-import: Fix incorrect fanout level when modifying existing notes refs
  t9301: Add 2nd testcase exposing bugs in fast-import's notes fanout handling
  t9301: Fix testcase covering up a bug in fast-import's notes fanout handling

13 years agoMerge branch 'jk/upload-archive-use-start-command'
Junio C Hamano [Sat, 17 Dec 2011 06:33:30 +0000 (22:33 -0800)]
Merge branch 'jk/upload-archive-use-start-command'

* jk/upload-archive-use-start-command:
  upload-archive: use start_command instead of fork

13 years agoMerge git://ozlabs.org/~paulus/gitk
Junio C Hamano [Sat, 17 Dec 2011 06:18:42 +0000 (22:18 -0800)]
Merge git://ozlabs.org/~paulus/gitk

* git://ozlabs.org/~paulus/gitk:
  gitk: Make vi-style keybindings more vi-like
  gitk: Make "touching paths" search support backslashes
  gitk: Show modified files with separate work tree
  gitk: Simplify calculation of gitdir
  gitk: Run 'git rev-parse --git-dir' only once
  gitk: Put temporary directory inside .git
  gitk: Fix "External diff" with separate work tree
  gitk: Fix "blame parent commit" with separate work tree
  gitk: Fix "show origin of this line" with separate work tree
  gitk: Fix file highlight when run in subdirectory
  gitk: Update copyright
  gitk: When a commit contains a note, mark it with a yellow box
  gitk: Remember time zones from author and commit timestamps
  gitk: Remove unused $cdate array

13 years agolf_to_crlf_filter(): tell the caller we added "\n" when draining
Junio C Hamano [Fri, 16 Dec 2011 22:39:37 +0000 (14:39 -0800)]
lf_to_crlf_filter(): tell the caller we added "\n" when draining

This can only happen when the input size is multiple of the
buffer size of the cascade filter (16k) and ends with an LF,
but in such a case, the code forgot to tell the caller that
it added the "\n" it could not add during the last round.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agorequest-pull: update the "pull" command generation logic
Junio C Hamano [Fri, 16 Dec 2011 17:00:11 +0000 (09:00 -0800)]
request-pull: update the "pull" command generation logic

The old code that insisted on asking for the tip of a branch to be pulled
were not updated when we started allowing for a tag to be pulled. When a
tag points at an older part of the history and there is no branch that
points at the tagged commit, the script failed to say which ref is to be
pulled.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agocheckout_merged(): squelch false warning from some gcc
Junio C Hamano [Thu, 15 Dec 2011 18:10:11 +0000 (10:10 -0800)]
checkout_merged(): squelch false warning from some gcc

gcc 4.6.2 (there may be others) does not realize that the variable "mode"
can never be used uninitialized in this function and issues a false warning
under -Wuninitialized option.

Squelch it with an unnecessary initialization; it is not like a single
assignment matters to the performance in this codepath that writes out
to the filesystem with checkout_entry() anyway.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agocompat/setenv.c: error if name contains '='
Erik Faye-Lund [Wed, 14 Dec 2011 14:07:09 +0000 (15:07 +0100)]
compat/setenv.c: error if name contains '='

According to POSIX, setenv should error out with EINVAL if it's
asked to set an environment variable whose name contains an equals
sign. Implement this detail in our compatibility-fallback.

Signed-off-by: Erik Faye-Lund <kusmabite@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agocompat/setenv.c: update errno when erroring out
Erik Faye-Lund [Wed, 14 Dec 2011 14:07:08 +0000 (15:07 +0100)]
compat/setenv.c: update errno when erroring out

Previously, gitsetenv didn't update errno as it should when
erroring out. Fix this.

Signed-off-by: Erik Faye-Lund <kusmabite@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agotest: errors preparing for a test are not special
Jonathan Nieder [Wed, 14 Dec 2011 08:22:03 +0000 (02:22 -0600)]
test: errors preparing for a test are not special

This script uses the following idiom to start each test in a known
good state:

test_expect_success 'some commands use a pager' '
rm -f paginated.out || cleanup_fail &&
test_terminal git log &&
test -e paginated.out
'

where "cleanup_fail" is a function that prints an error message and
errors out.

That is bogus on three levels:

 - Cleanup commands like "rm -f" and "test_unconfig" are designed not
   to fail, so this logic would never trip.

 - If they were to malfunction anyway, it is not useful to set apart
   cleanup commands as a special kind of failure with a special error
   message.  Whichever command fails, the next step is to investigate
   which command that was, for example by running tests with
   "prove -e 'sh -x'", and fix it.

 - Relying on left-associativity of mixed &&/|| lists makes the code
   somewhat cryptic.

The fix is simple: drop the "|| cleanup_fail" in each test and the
definition of the "cleanup_fail" function so no new callers can arise.

Reported-by: Johannes Sixt <j6t@kdbg.org>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agoUpdate draft release notes to 1.7.9
Junio C Hamano [Wed, 14 Dec 2011 07:09:27 +0000 (23:09 -0800)]
Update draft release notes to 1.7.9

Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agoMerge branch 'ks/tag-cleanup'
Junio C Hamano [Wed, 14 Dec 2011 07:03:00 +0000 (23:03 -0800)]
Merge branch 'ks/tag-cleanup'

* ks/tag-cleanup:
  git-tag: introduce --cleanup option

Conflicts:
builtin/tag.c

13 years agoMerge branch 'jl/submodule-status-failure-report'
Junio C Hamano [Wed, 14 Dec 2011 07:00:52 +0000 (23:00 -0800)]
Merge branch 'jl/submodule-status-failure-report'

* jl/submodule-status-failure-report:
  diff/status: print submodule path when looking for changes fails

13 years agoMerge branch 'tr/userdiff-c-returns-pointer'
Junio C Hamano [Wed, 14 Dec 2011 06:57:19 +0000 (22:57 -0800)]
Merge branch 'tr/userdiff-c-returns-pointer'

* tr/userdiff-c-returns-pointer:
  userdiff: allow * between cpp funcname words

13 years agoMerge branch 'bc/maint-apply-check-no-patch'
Junio C Hamano [Wed, 14 Dec 2011 06:56:22 +0000 (22:56 -0800)]
Merge branch 'bc/maint-apply-check-no-patch'

* bc/maint-apply-check-no-patch:
  builtin/apply.c: report error on failure to recognize input
  t/t4131-apply-fake-ancestor.sh: fix broken test

13 years agoMerge branch 'nd/ignore-might-be-precious'
Junio C Hamano [Wed, 14 Dec 2011 06:55:07 +0000 (22:55 -0800)]
Merge branch 'nd/ignore-might-be-precious'

* nd/ignore-might-be-precious:
  checkout,merge: disallow overwriting ignored files with --no-overwrite-ignore

13 years agoMerge branch 'jn/branch-move-to-self'
Junio C Hamano [Wed, 14 Dec 2011 06:53:08 +0000 (22:53 -0800)]
Merge branch 'jn/branch-move-to-self'

* jn/branch-move-to-self:
  Allow checkout -B <current-branch> to update the current branch
  branch: allow a no-op "branch -M <current-branch> HEAD"

13 years agoMerge branch 'cn/maint-lf-to-crlf-filter'
Junio C Hamano [Wed, 14 Dec 2011 06:49:45 +0000 (22:49 -0800)]
Merge branch 'cn/maint-lf-to-crlf-filter'

* cn/maint-lf-to-crlf-filter:
  convert: track state in LF-to-CRLF filter

13 years agoMerge branch 'tj/maint-imap-send-remove-unused'
Junio C Hamano [Wed, 14 Dec 2011 06:49:19 +0000 (22:49 -0800)]
Merge branch 'tj/maint-imap-send-remove-unused'

* tj/maint-imap-send-remove-unused:
  imap-send: Remove unused 'use_namespace' variable

13 years agoMerge branch 'jk/maint-upload-archive'
Junio C Hamano [Wed, 14 Dec 2011 06:47:38 +0000 (22:47 -0800)]
Merge branch 'jk/maint-upload-archive'

* jk/maint-upload-archive:
  archive: don't let remote clients get unreachable commits

13 years agoMerge branch 'jn/gitweb-side-by-side-diff'
Junio C Hamano [Wed, 14 Dec 2011 06:46:57 +0000 (22:46 -0800)]
Merge branch 'jn/gitweb-side-by-side-diff'

* jn/gitweb-side-by-side-diff:
  gitweb: Add navigation to select side-by-side diff
  gitweb: Use href(-replay=>1,...) for formats links in "commitdiff"
  t9500: Add basic sanity tests for side-by-side diff in gitweb
  t9500: Add test for handling incomplete lines in diff by gitweb
  gitweb: Give side-by-side diff extra CSS styling
  gitweb: Add a feature to show side-by-side diff
  gitweb: Extract formatting of diff chunk header
  gitweb: Refactor diff body line classification

13 years agoMerge branch 'maint'
Junio C Hamano [Wed, 14 Dec 2011 06:18:00 +0000 (22:18 -0800)]
Merge branch 'maint'

* maint:
  Update draft release notes for 1.7.8.1
  Git 1.7.7.5
  Git 1.7.6.5
  blame: don't overflow time buffer
  fetch: create status table using strbuf

Conflicts:
RelNotes

13 years agoUpdate draft release notes for 1.7.8.1
Junio C Hamano [Wed, 14 Dec 2011 06:08:52 +0000 (22:08 -0800)]
Update draft release notes for 1.7.8.1

Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agoMerge branch 'jc/maint-pack-object-cycle' into maint
Junio C Hamano [Wed, 14 Dec 2011 06:04:50 +0000 (22:04 -0800)]
Merge branch 'jc/maint-pack-object-cycle' into maint

* jc/maint-pack-object-cycle:
  pack-object: tolerate broken packs that have duplicated objects

Conflicts:
builtin/pack-objects.c

13 years agoMerge branch 'jc/index-pack-reject-dups' into maint
Junio C Hamano [Wed, 14 Dec 2011 06:03:36 +0000 (22:03 -0800)]
Merge branch 'jc/index-pack-reject-dups' into maint

* jc/index-pack-reject-dups:
  receive-pack, fetch-pack: reject bogus pack that records objects twice

13 years agoMerge branch 'mf/curl-select-fdset' into maint
Junio C Hamano [Wed, 14 Dec 2011 06:03:17 +0000 (22:03 -0800)]
Merge branch 'mf/curl-select-fdset' into maint

* mf/curl-select-fdset:
  http: drop "local" member from request struct
  http.c: Rely on select instead of tracking whether data was received
  http.c: Use timeout suggested by curl instead of fixed 50ms timeout
  http.c: Use curl_multi_fdset to select on curl fds instead of just sleeping

13 years agoMerge branch 'nd/misc-cleanups' into maint
Junio C Hamano [Wed, 14 Dec 2011 06:02:51 +0000 (22:02 -0800)]
Merge branch 'nd/misc-cleanups' into maint

* nd/misc-cleanups:
  unpack_object_header_buffer(): clear the size field upon error
  tree_entry_interesting: make use of local pointer "item"
  tree_entry_interesting(): give meaningful names to return values
  read_directory_recursive: reduce one indentation level
  get_tree_entry(): do not call find_tree_entry() on an empty tree
  tree-walk.c: do not leak internal structure in tree_entry_len()

13 years agoMerge branch 'maint-1.7.7' into maint
Junio C Hamano [Wed, 14 Dec 2011 05:58:51 +0000 (21:58 -0800)]
Merge branch 'maint-1.7.7' into maint

* maint-1.7.7:
  Git 1.7.7.5
  Git 1.7.6.5
  blame: don't overflow time buffer
  fetch: create status table using strbuf
  checkout,merge: loosen overwriting untracked file check based on info/exclude
  cast variable in call to free() in builtin/diff.c and submodule.c
  apply: get rid of useless x < 0 comparison on a size_t type

Conflicts:
Documentation/git.txt
GIT-VERSION-GEN
RelNotes
builtin/fetch.c

13 years agoGit 1.7.7.5 v1.7.7.5
Junio C Hamano [Wed, 14 Dec 2011 05:55:31 +0000 (21:55 -0800)]
Git 1.7.7.5

Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agoMerge branch 'ab/clang-lints' into maint-1.7.7
Junio C Hamano [Wed, 14 Dec 2011 05:47:51 +0000 (21:47 -0800)]
Merge branch 'ab/clang-lints' into maint-1.7.7

* ab/clang-lints:
  cast variable in call to free() in builtin/diff.c and submodule.c
  apply: get rid of useless x < 0 comparison on a size_t type

13 years agoMerge branch 'nd/maint-ignore-exclude' into maint-1.7.7
Junio C Hamano [Wed, 14 Dec 2011 05:47:08 +0000 (21:47 -0800)]
Merge branch 'nd/maint-ignore-exclude' into maint-1.7.7

* nd/maint-ignore-exclude:
  checkout,merge: loosen overwriting untracked file check based on info/exclude

13 years agoMerge branch 'maint-1.7.6' into maint-1.7.7
Junio C Hamano [Wed, 14 Dec 2011 05:44:56 +0000 (21:44 -0800)]
Merge branch 'maint-1.7.6' into maint-1.7.7

* maint-1.7.6:
  Git 1.7.6.5
  blame: don't overflow time buffer
  fetch: create status table using strbuf

Conflicts:
Documentation/git.txt
GIT-VERSION-GEN
RelNotes

13 years agoGit 1.7.6.5 v1.7.6.5
Junio C Hamano [Wed, 14 Dec 2011 05:30:40 +0000 (21:30 -0800)]
Git 1.7.6.5

Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agoMerge branch 'jk/maint-fetch-status-table' into maint-1.7.6
Junio C Hamano [Wed, 14 Dec 2011 05:21:30 +0000 (21:21 -0800)]
Merge branch 'jk/maint-fetch-status-table' into maint-1.7.6

* jk/maint-fetch-status-table:
  fetch: create status table using strbuf

13 years agoMerge branch 'jc/maint-name-rev-all' into maint-1.7.6
Junio C Hamano [Wed, 14 Dec 2011 05:12:34 +0000 (21:12 -0800)]
Merge branch 'jc/maint-name-rev-all' into maint-1.7.6

* jc/maint-name-rev-all:
  name-rev --all: do not even attempt to describe non-commit object

13 years agoMerge branch 'ml/mailmap' into maint-1.7.6
Junio C Hamano [Wed, 14 Dec 2011 05:12:14 +0000 (21:12 -0800)]
Merge branch 'ml/mailmap' into maint-1.7.6

* ml/mailmap:
  mailmap: xcalloc mailmap_info

Conflicts:
mailmap.c

13 years agoblame: don't overflow time buffer
Jeff King [Thu, 8 Dec 2011 10:25:54 +0000 (05:25 -0500)]
blame: don't overflow time buffer

When showing the raw timestamp, we format the numeric
seconds-since-epoch into a buffer, followed by the timezone
string. This string has come straight from the commit
object. A well-formed object should have a timezone string
of only a few bytes, but we could be operating on data
pushed by a malicious user.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agoMerge branch 'master' of git://repo.or.cz/git-gui
Junio C Hamano [Wed, 14 Dec 2011 00:48:24 +0000 (16:48 -0800)]
Merge branch 'master' of git://repo.or.cz/git-gui

* 'master' of git://repo.or.cz/git-gui: (28 commits)
  git-gui 0.16
  git-gui: handle shell script text filters when loading for blame.
  git-gui: Set both 16x16 and 32x32 icons on X to pacify Xming.
  git-gui: added config gui.gcwarning to disable the gc hint message
  git-gui: set whitespace warnings appropriate to this project
  git-gui: don't warn for detached head when rebasing
  git-gui: make config gui.warndetachedcommit a boolean
  git-gui: add config value gui.diffopts for passing additional diff options
  git-gui: sort the numeric ansi codes
  git-gui: support underline style when parsing diff output
  git-gui: fix spelling error in sshkey.tcl
  git-gui: include the file path in guitools confirmation dialog
  git-gui: span widgets over the full file output area in the blame view
  git-gui: use a tristate to control the case mode in the searchbar
  git-gui: set suitable extended window manager hints.
  git-gui: fix display of path in browser title
  git-gui: enable the smart case sensitive search only if gui.search.smartcase is true
  git-gui: catch invalid or complete regular expressions and treat as no match.
  git-gui: theme the search and line-number entry fields on blame screen
  git-gui: include the number of untracked files to stage when asking the user
  ...

13 years agohttp-push: enable "proactive auth"
Jeff King [Wed, 14 Dec 2011 00:11:56 +0000 (19:11 -0500)]
http-push: enable "proactive auth"

Before commit 986bbc08, git was proactive about asking for
http passwords. It assumed that if you had a username in
your URL, you would also want a password, and asked for it
before making any http requests.

However, this could interfere with the use of .netrc (see
986bbc08 for details). And it was also unnecessary, since
the http fetching code had learned to recognize an HTTP 401
and prompt the user then. Furthermore, the proactive prompt
could interfere with the usage of .netrc (see 986bbc08 for
details).

Unfortunately, the http push-over-DAV code never learned to
recognize HTTP 401, and so was broken by this change. This
patch does a quick fix of re-enabling the "proactive auth"
strategy only for http-push, leaving the dumb http fetch and
smart-http as-is.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agogit-gui 0.16 gitgui-0.16.0
Pat Thoyts [Tue, 13 Dec 2011 23:44:30 +0000 (23:44 +0000)]
git-gui 0.16

Signed-off-by: Pat Thoyts <patthoyts@users.sourceforge.net>
13 years agot5540: test DAV push with authentication
Jeff King [Tue, 13 Dec 2011 20:17:04 +0000 (15:17 -0500)]
t5540: test DAV push with authentication

We don't currently test this case at all, and instead just
test the DAV mechanism over an unauthenticated push. That
isn't very realistic, as most people will want to
authenticate pushes.

Two of the tests expect_failure as they reveal bugs:

  1. Pushing without a username in the URL fails to ask for
     credentials when we get an HTTP 401. This has always
     been the case, but it would be nice if it worked like
     smart-http.

  2. Pushing with a username fails to ask for the password
     since 986bbc0 (http: don't always prompt for password,
     2011-11-04). This is a severe regression in v1.7.8, as
     authenticated push-over-DAV is now totally unusable
     unless you have credentials in your .netrc.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agoconnect.c: drop path_match function
Jeff King [Tue, 13 Dec 2011 00:49:59 +0000 (19:49 -0500)]
connect.c: drop path_match function

This function was used for comparing local and remote ref
names during fetch (which makes it a candidate for "most
confusingly named function of the year").

It no longer has any callers, so let's get rid of it.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agofetch-pack: match refs exactly
Jeff King [Tue, 13 Dec 2011 00:48:08 +0000 (19:48 -0500)]
fetch-pack: match refs exactly

When we are determining the list of refs to fetch via
fetch-pack, we have two sets of refs to compare: those on
the remote side, and a "match" list of things we want to
fetch. We iterate through the remote refs alphabetically,
seeing if each one is wanted by the "match" list.

Since def88e9 (Commit first cut at "git-fetch-pack",
2005-07-04), we have used the "path_match" function to do a
suffix match, where a remote ref is considered wanted if
any of the "match" elements is a suffix of the remote
refname.

This enables callers of fetch-pack to specify unqualified
refs and have them matched up with remote refs (e.g., ask
for "A" and get remote's "refs/heads/A"). However, if you
provide a fully qualified ref, then there are corner cases
where we provide the wrong answer. For example, given a
remote with two refs:

   refs/foo/refs/heads/master
   refs/heads/master

asking for "refs/heads/master" will first match
"refs/foo/refs/heads/master" by the suffix rule, and we will
erroneously fetch it instead of refs/heads/master.

As it turns out, all callers of fetch_pack do provide
fully-qualified refs for the match list. There are two ways
fetch_pack can get match lists:

  1. Through the transport code (i.e., via git-fetch)

  2. On the command-line of git-fetch-pack

In the first case, we will always be providing the names of
fully-qualified refs from "struct ref" objects. We will have
pre-matched those ref objects already (since we have to
handle more advanced matching, like wildcard refspecs), and
are just providing a list of the refs whose objects we need.

In the second case, users could in theory be providing
non-qualified refs on the command-line. However, the
fetch-pack documentation claims that refs should be fully
qualified (and has always done so since it was written in
2005).

Let's change this path_match call to simply check for string
equality, matching what the callers of fetch_pack are
expecting.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agot5500: give fully-qualified refs to fetch-pack
Jeff King [Tue, 13 Dec 2011 00:44:40 +0000 (19:44 -0500)]
t5500: give fully-qualified refs to fetch-pack

The fetch-pack documentation is very clear that refs given
on the command line are to be full refs:

  <refs>...::
          The remote heads to update from. This is relative to
          $GIT_DIR (e.g. "HEAD", "refs/heads/master").  When
          unspecified, update from all heads the remote side has.

and this has been the case since fetch-pack was originally documented in
8b3d9dc ([PATCH] Documentation: clone/fetch/upload., 2005-07-14).

Let's follow our own documentation to set a good example,
and to avoid breaking when this restriction is enforced in
the next patch.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agodrop "match" parameter from get_remote_heads
Jeff King [Tue, 13 Dec 2011 00:41:37 +0000 (19:41 -0500)]
drop "match" parameter from get_remote_heads

The get_remote_heads function reads the list of remote refs
during git protocol session. It dates all the way back to
def88e9 (Commit first cut at "git-fetch-pack", 2005-07-04).
At that time, the idea was to come up with a list of refs we
were interested in, and then filter the list as we got it
from the remote side.

Later, 1baaae5 (Make maximal use of the remote refs,
2005-10-28) stopped filtering at the get_remote_heads layer,
letting us use the non-matching refs to find common history.

As a result, all callers now simply pass an empty match
list (and any future callers will want to do the same). So
let's drop these now-useless parameters.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agoRename resolve_ref() to resolve_ref_unsafe()
Nguyễn Thái Ngọc Duy [Mon, 12 Dec 2011 11:20:32 +0000 (18:20 +0700)]
Rename resolve_ref() to resolve_ref_unsafe()

resolve_ref() may return a pointer to a shared buffer and can be
overwritten by the next resolve_ref() calls. Callers need to
pay attention, not to keep the pointer when the next call happens.

Rename with "_unsafe" suffix to warn developers (or reviewers) before
introducing new call sites.

This patch is generated using the following command

git grep -l 'resolve_ref(' -- '*.[ch]'|xargs sed -i 's/resolve_ref(/resolve_ref_unsafe(/g'

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agoConvert resolve_ref+xstrdup to new resolve_refdup function
Nguyễn Thái Ngọc Duy [Tue, 13 Dec 2011 14:17:48 +0000 (21:17 +0700)]
Convert resolve_ref+xstrdup to new resolve_refdup function

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agoUpdate documentation for stripspace
Conrad Irwin [Mon, 12 Dec 2011 23:52:51 +0000 (15:52 -0800)]
Update documentation for stripspace

Tell the user what this command is intended for, and expand the
description of what it does.

Signed-off-by: Conrad Irwin <conrad.irwin@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agocontrib: add credential helper for OS X Keychain
Jeff King [Sat, 10 Dec 2011 10:53:14 +0000 (05:53 -0500)]
contrib: add credential helper for OS X Keychain

With this installed in your $PATH, you can store
git-over-http passwords in your keychain by doing:

  git config credential.helper osxkeychain

The code is based in large part on the work of Jay Soffian,
who wrote the helper originally for the initial, unpublished
version of the credential helper protocol.

This version will pass t0303 if you do:

  GIT_TEST_CREDENTIAL_HELPER=osxkeychain \
  GIT_TEST_CREDENTIAL_HELPER_SETUP="export HOME=$HOME" \
  ./t0303-credential-external.sh

The "HOME" setup is unfortunately necessary. The test
scripts set HOME to the trash directory, but this causes the
keychain API to complain.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agoMakefile: OS X has /dev/tty
Jeff King [Sat, 10 Dec 2011 10:41:30 +0000 (05:41 -0500)]
Makefile: OS X has /dev/tty

We can use our enhanced getpass(). Tested by me.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agoMakefile: linux has /dev/tty
Jeff King [Sat, 10 Dec 2011 10:41:27 +0000 (05:41 -0500)]
Makefile: linux has /dev/tty

Therefore we can turn on our custom prompt function instead
of relying on getpass.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agocredential: use git_prompt instead of git_getpass
Jeff King [Sat, 10 Dec 2011 10:41:23 +0000 (05:41 -0500)]
credential: use git_prompt instead of git_getpass

We use git_getpass to retrieve the username and password
from the terminal. However, git_getpass will not echo the
username as the user types. We can fix this by using the
more generic git_prompt, which underlies git_getpass but
lets us specify an "echo" option.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
13 years agot: add test harness for external credential helpers
Jeff King [Sat, 10 Dec 2011 10:35:55 +0000 (05:35 -0500)]
t: add test harness for external credential helpers

We already have tests for the internal helpers, but it's
nice to give authors of external tools an easy way to
sanity-check their helpers.

If you have written the "git-credential-foo" helper, you can
do so with:

  GIT_TEST_CREDENTIAL_HELPER=foo \
  make t0303-credential-external.sh

This assumes that your helper is capable of both storing and
retrieving credentials (some helpers may be read-only, and
they will fail these tests).

If your helper supports time-based expiration with a
configurable timeout, you can test that feature like this:

  GIT_TEST_CREDENTIAL_HELPER_TIMEOUT="foo --timeout=1" \
  make t0303-credential-external.sh

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>