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Author SHA1 Message Date
Junio C Hamano
20d16da5ca Merge branch 'qn/blame-show-email'
"git blame" learned blame.showEmail configuration variable.

* qn/blame-show-email:
  blame: add blame.showEmail configuration
2015-06-24 12:21:41 -07:00
Junio C Hamano
de04706e31 Merge branch 'jc/do-not-feed-tags-to-clear-commit-marks'
"git format-patch --ignore-if-upstream A..B" did not like to be fed
tags as boundary commits.

* jc/do-not-feed-tags-to-clear-commit-marks:
  format-patch: do not feed tags to clear_commit_marks()
2015-06-24 12:21:40 -07:00
Junio C Hamano
8c17d5a3c0 Merge branch 'es/send-email-sendmail-alias'
"git send-email" learned to handle more forms of sendmail style
aliases file.

* es/send-email-sendmail-alias:
  send-email: further warn about unsupported sendmail aliases features
  t9001: add sendmail aliases line continuation tests
  t9001: refactor sendmail aliases test infrastructure
  send-email: implement sendmail aliases line continuation support
  send-email: simplify sendmail aliases comment and blank line recognizer
  send-email: refactor sendmail aliases parser
  send-email: fix style: cuddle 'elsif' and 'else' with closing brace
  send-email: drop noise comments which merely repeat what code says
  send-email: visually distinguish sendmail aliases parser warnings
  send-email: further document missing sendmail aliases functionality
2015-06-24 12:21:39 -07:00
Junio C Hamano
59c465d5c0 Merge branch 'jc/apply-reject-noop-hunk'
"git apply" cannot diagnose a patch corruption when the breakage is
to mark the length of the hunk shorter than it really is on the
hunk header line "@@ -l,k +m,n @@"; one special case it could is
when the hunk becomes no-op (e.g. k == n == 2 for two-line context
patch output), and it learned how to do so.

* jc/apply-reject-noop-hunk:
  apply: reject a hunk that does not do anything
2015-06-24 12:21:39 -07:00
Junio C Hamano
103b6f9c2b Merge branch 'jk/die-on-bogus-worktree-late'
The setup code used to die when core.bare and core.worktree are set
inconsistently, even for commands that do not need working tree.

* jk/die-on-bogus-worktree-late:
  setup_git_directory: delay core.bare/core.worktree errors
2015-06-16 14:27:06 -07:00
Junio C Hamano
412e63f0fd Merge branch 'ah/send-email-sendmail-alias'
"git send-email" learned the alias file format used by the sendmail
program (in an abbreviated form).

* ah/send-email-sendmail-alias:
  t9001: write $HOME/, not ~/, to help shells without tilde expansion
  send-email: add sendmail email aliases format
2015-06-16 14:27:04 -07:00
Junio C Hamano
43262d8d65 Merge branch 'jk/squelch-missing-link-warning-for-unreachable'
Recent "git prune" traverses young unreachable objects to safekeep
old objects in the reachability chain from them, which sometimes
caused error messages that are unnecessarily alarming.

* jk/squelch-missing-link-warning-for-unreachable:
  suppress errors on missing UNINTERESTING links
  silence broken link warnings with revs->ignore_missing_links
  add quieter versions of parse_{tree,commit}
2015-06-11 09:29:59 -07:00
Junio C Hamano
0e04b248b5 Merge branch 'pt/pull-tests'
Add more test coverage to "git pull".

* pt/pull-tests:
  t5520: check reflog action in fast-forward merge
  t5521: test --dry-run does not make any changes
  t5520: test --rebase failure on unborn branch with index
  t5520: test --rebase with multiple branches
  t5520: test work tree fast-forward when fetch updates head
  t5520: test for failure if index has unresolved entries
  t5520: test no merge candidates cases
  t5520: prevent field splitting in content comparisons
2015-06-11 09:29:58 -07:00
Junio C Hamano
829f03e98c Merge branch 'mh/verify-lock-error-report'
Bring consistency to error reporting mechanism used in "refs" API.

* mh/verify-lock-error-report:
  ref_transaction_commit(): do not capitalize error messages
  verify_lock(): do not capitalize error messages
  verify_lock(): report errors via a strbuf
  verify_lock(): on errors, let the caller unlock the lock
  verify_lock(): return 0/-1 rather than struct ref_lock *
2015-06-11 09:29:54 -07:00
Junio C Hamano
709cd912d4 Merge branch 'jc/diff-ws-error-highlight'
Allow whitespace breakages in deleted and context lines to be also
painted in the output.

* jc/diff-ws-error-highlight:
  diff.c: --ws-error-highlight=<kind> option
  diff.c: add emit_del_line() and emit_context_line()
  t4015: separate common setup and per-test expectation
  t4015: modernise style
2015-06-11 09:29:51 -07:00
Junio C Hamano
9fb0a798a7 Merge branch 'ld/p4-editor-multi-words'
Unlike "$EDITOR" and "$GIT_EDITOR" that can hold the path to the
command and initial options (e.g. "/path/to/emacs -nw"), 'git p4'
did not let the shell interpolate the contents of the environment
variable that name the editor "$P4EDITOR" (and "$EDITOR", too).
Make it in line with the rest of Git, as well as with Perforce.

* ld/p4-editor-multi-words:
  git-p4: tests: use test-chmtime in place of touch
  git-p4: fix handling of multi-word P4EDITOR
  git-p4: add failing test for P4EDITOR handling
2015-06-05 12:17:38 -07:00
Junio C Hamano
c4a8354bc1 Merge branch 'jk/at-push-sha1'
Introduce <branch>@{push} short-hand to denote the remote-tracking
branch that tracks the branch at the remote the <branch> would be
pushed to.

* jk/at-push-sha1:
  for-each-ref: accept "%(push)" format
  for-each-ref: use skip_prefix instead of starts_with
  sha1_name: implement @{push} shorthand
  sha1_name: refactor interpret_upstream_mark
  sha1_name: refactor upstream_mark
  remote.c: add branch_get_push
  remote.c: return upstream name from stat_tracking_info
  remote.c: untangle error logic in branch_get_upstream
  remote.c: report specific errors from branch_get_upstream
  remote.c: introduce branch_get_upstream helper
  remote.c: hoist read_config into remote_get_1
  remote.c: provide per-branch pushremote name
  remote.c: hoist branch.*.remote lookup out of remote_get_1
  remote.c: drop "remote" pointer from "struct branch"
  remote.c: refactor setup of branch->merge list
  remote.c: drop default_remote_name variable
2015-06-05 12:17:36 -07:00
Junio C Hamano
9b7a61d7da format-patch: do not feed tags to clear_commit_marks()
"git format-patch --ignore-if-in-upstream A..B", when either A or B
is a tag, failed miserably.

This is because the code passes the tips it used for traversal to
clear_commit_marks(), after running a temporary revision traversal
to enumerate the commits on both branches to find if they have
commits that make equivalent changes.  The revision traversal
machinery knows how to enumerate commits reachable starting from a
tag, but clear_commit_marks() wants to take nothing but a commit.

In the longer term, it might be a more correct fix to teach
clear_commit_marks() to do the same "committish to commit"
dereferencing that is done in the revision traversal machinery,
but for now this fix should suffice.

Reported-by: Bruce Korb <bruce.korb@gmail.com>
Helped-by: Christian Couder <christian.couder@gmail.com>
Helped-by: brian m. carlson <sandals@crustytoothpaste.net>
Helped-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-06-01 16:02:52 -07:00
Eric Sunshine
6be0264030 t9001: add sendmail aliases line continuation tests
A line beginning with whitespace is folded into the preceding line.
A line ending with '\' consumes the following line.

While here, also test an empty sendmail aliases file.

Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-06-01 15:53:15 -07:00
Eric Sunshine
514554cf53 t9001: refactor sendmail aliases test infrastructure
Several new tests of sendmail aliases parsing will be added in a
subsequent patch, so factor out functionality common to all of them
into a new helper function.

Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-06-01 15:53:13 -07:00
Quentin Neill
8b504db309 blame: add blame.showEmail configuration
Complement existing --show-email option with fallback
configuration variable, with tests.

Signed-off-by: Quentin Neill <quentin.neill@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-06-01 15:50:43 -07:00
Junio C Hamano
a6be52e239 Merge branch 'mm/rebase-i-post-rewrite-exec'
"git rebase -i" fired post-rewrite hook when it shouldn't (namely,
when it was told to stop sequencing with 'exec' insn).

* mm/rebase-i-post-rewrite-exec:
  t5407: use <<- to align the expected output
  rebase -i: fix post-rewrite hook with failed exec command
  rebase -i: demonstrate incorrect behavior of post-rewrite
2015-06-01 12:45:20 -07:00
Junio C Hamano
a9d3493380 Merge branch 'fm/fetch-raw-sha1'
"git upload-pack" that serves "git fetch" can be told to serve
commits that are not at the tip of any ref, as long as they are
reachable from a ref, with uploadpack.allowReachableSHA1InWant
configuration variable.

* fm/fetch-raw-sha1:
  upload-pack: optionally allow fetching reachable sha1
  upload-pack: prepare to extend allow-tip-sha1-in-want
  config.txt: clarify allowTipSHA1InWant with camelCase
2015-06-01 12:45:19 -07:00
Junio C Hamano
67f0b6f3b2 Merge branch 'dt/cat-file-follow-symlinks'
"git cat-file --batch(-check)" learned the "--follow-symlinks"
option that follows an in-tree symbolic link when asked about an
object via extended SHA-1 syntax, e.g. HEAD:RelNotes that points at
Documentation/RelNotes/2.5.0.txt.  With the new option, the command
behaves as if HEAD:Documentation/RelNotes/2.5.0.txt was given as
input instead.

* dt/cat-file-follow-symlinks:
  cat-file: add --follow-symlinks to --batch
  sha1_name: get_sha1_with_context learns to follow symlinks
  tree-walk: learn get_tree_entry_follow_symlinks
2015-06-01 12:45:16 -07:00
Junio C Hamano
f693bb0bb0 Merge branch 'jk/stash-options'
Make "git stash something --help" error out, so that users can
safely say "git stash drop --help".

* jk/stash-options:
  stash: recognize "--help" for subcommands
  stash: complain about unknown flags
2015-06-01 12:45:14 -07:00
Junio C Hamano
152722f155 Merge branch 'jh/filter-empty-contents'
The clean/smudge interface did not work well when filtering an
empty contents (failed and then passed the empty input through).
It can be argued that a filter that produces anything but empty for
an empty input is nonsense, but if the user wants to do strange
things, then why not?

* jh/filter-empty-contents:
  sha1_file: pass empty buffer to index empty file
2015-06-01 12:45:11 -07:00
Junio C Hamano
777e75b605 Merge branch 'jk/http-backend-deadlock'
Communication between the HTTP server and http_backend process can
lead to a dead-lock when relaying a large ref negotiation request.
Diagnose the situation better, and mitigate it by reading such a
request first into core (to a reasonable limit).

* jk/http-backend-deadlock:
  http-backend: spool ref negotiation requests to buffer
  t5551: factor out tag creation
  http-backend: fix die recursion with custom handler
2015-06-01 12:45:09 -07:00
Junio C Hamano
ad6e8ed37b apply: reject a hunk that does not do anything
A hunk like this in a hand-edited patch without correctly adjusting
the line counts:

     @@ -660,2 +660,2 @@ inline struct sk_buff *ieee80211_authentic...
             auth = (struct ieee80211_authentication *)
                     skb_put(skb, sizeof(struct ieee80211_authentication));
     -       some old text
     +       some new text
     --
     2.1.0

     dev mailing list

at the end of the input does not have a good way for us to diagnose
it as a corrupt patch.  We just read two context lines and discard
the remainder as cruft, which we must do in order to ignore the
e-mail footer.  Notice that the patch does not change anything and
signal an error.

Note that this fix will not help if the hand-edited hunk header were
"@@ -660,3, +660,2" to include the removal.  We would just remove
the old text without adding the new one, and treat "+ some new text"
and everything after that line as trailing cruft.  So it is dubious
that this patch alone would help very much in practice, but it may
be better than nothing.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-06-01 12:12:04 -07:00
Jeff King
daf7d86783 silence broken link warnings with revs->ignore_missing_links
We set revs->ignore_missing_links to instruct the
revision-walking machinery that we know the history graph
may be incomplete. For example, we use it when walking
unreachable but recent objects; we want to add what we can,
but it's OK if the history is incomplete.

However, we still print error messages for the missing
objects, which can be confusing. This is not an error, but
just a normal situation when transitioning from a repository
last pruned by an older git (which can leave broken segments
of history) to a more recent one (where we try to preserve
whole reachable segments).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-06-01 09:29:50 -07:00
Jeff King
fada767463 setup_git_directory: delay core.bare/core.worktree errors
If both core.bare and core.worktree are set, we complain
about the bogus config and die. Dying is good, because it
avoids commands running and doing damage in a potentially
incorrect setup. But dying _there_ is bad, because it means
that commands which do not even care about the work tree
cannot run. This can make repairing the situation harder:

  [setup]
  $ git config core.bare true
  $ git config core.worktree /some/path

  [OK, expected.]
  $ git status
  fatal: core.bare and core.worktree do not make sense

  [Hrm...]
  $ git config --unset core.worktree
  fatal: core.bare and core.worktree do not make sense

  [Nope...]
  $ git config --edit
  fatal: core.bare and core.worktree do not make sense

  [Gaaah.]
  $ git help config
  fatal: core.bare and core.worktree do not make sense

Instead, let's issue a warning about the bogus config when
we notice it (i.e., for all commands), but only die when the
command tries to use the work tree (by calling setup_work_tree).
So we now get:

  $ git status
  warning: core.bare and core.worktree do not make sense
  fatal: unable to set up work tree using invalid config

  $ git config --unset core.worktree
  warning: core.bare and core.worktree do not make sense

We have to update t1510 to accomodate this; it uses
symbolic-ref to check whether the configuration works or
not, but of course that command does not use the working
tree. Instead, we switch it to use `git status`, as it
requires a work-tree, does not need any special setup, and
is read-only (so a failure will not adversely affect further
tests).

In addition, we add a new test that checks the desired
behavior (i.e., that running "git config" with the bogus
config does in fact work).

Reported-by: SZEDER Gábor <szeder@ira.uka.de>
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-05-29 09:27:27 -07:00
Paul Tan
80ea984da6 t5520: check reflog action in fast-forward merge
When testing a fast-forward merge with git-pull, check to see if the
reflog action is "pull" with the arguments passed to git-pull.

While we are in the vicinity, remove the empty line as well.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-05-29 09:16:11 -07:00
Paul Tan
5504f13a7c t5521: test --dry-run does not make any changes
Test that when --dry-run is provided to git-pull, it does not make any
changes, namely:

* --dry-run gets passed to git-fetch, so no FETCH_HEAD will be created
  and no refs will be fetched.

* The index and work tree will not be modified.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-05-29 09:16:01 -07:00
Paul Tan
fa14ee77ac t5520: test --rebase failure on unborn branch with index
Commit 19a7fcb (allow pull --rebase on branch yet to be born,
2009-08-11) special cases git-pull on an unborn branch in a different
code path such that git-pull --rebase is still valid even though there
is no HEAD yet.

This code path still ensures that there is no index in order not to lose
any staged changes. Implement a test to ensure that this check is
triggered.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-05-29 09:15:35 -07:00
Paul Tan
9570d67c00 t5520: test --rebase with multiple branches
Since rebasing on top of multiple upstream branches does not make sense,
since 51b2ead (disallow providing multiple upstream branches to rebase,
pull --rebase, 2009-02-18), git-pull explicitly disallowed specifying
multiple branches in the rebase case.

Implement tests to ensure that git-pull fails and prints out the
user-friendly error message in such a case.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-05-29 09:15:24 -07:00
Paul Tan
9f992262fb t5520: test work tree fast-forward when fetch updates head
Since b10ac50 (Fix pulling into the same branch., 2005-08-25), git-pull,
upon detecting that git-fetch updated the current head, will
fast-forward the working tree to the updated head commit.

Implement tests to ensure that the fast-forward occurs in such a case,
as well as to ensure that the user-friendly advice is printed upon
failure.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-05-29 09:15:10 -07:00
Paul Tan
05438afca7 t5520: test for failure if index has unresolved entries
Commit d38a30d (Be more user-friendly when refusing to do something
because of conflict., 2010-01-12) introduced code paths to git-pull
which will error out with user-friendly advices if the user is in the
middle of a merge or has unmerged files.

Implement tests to ensure that git-pull will not run, and will print
these advices, if the user is in the middle of a merge or has unmerged
files in the index.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-05-29 09:14:52 -07:00
Michael Haggerty
c2e0a718c6 ref_transaction_commit(): do not capitalize error messages
Our convention is for error messages to start with a lower-case
letter.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-05-27 15:58:42 -07:00
Junio C Hamano
77bd3ea9f5 Merge branch 'nd/untracked-cache'
* nd/untracked-cache:
  t7063: hide stderr from setup inside prereq
2015-05-27 13:14:38 -07:00
Jeff King
fa73a582b5 t7063: hide stderr from setup inside prereq
When t7063 starts, it runs "update-index --untracked-cache"
to see if we support the untracked cache. Its output goes
straight to stderr, even if the test is not run with "-v".
Let's wrap it in a prereq that will hide the output by
default, but show it with "-v".

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-05-27 13:14:29 -07:00
Junio C Hamano
587089c195 t9001: write $HOME/, not ~/, to help shells without tilde expansion
Even though it is in POSIX, we do not have to use it, only to hurt
shells that may lack the support.

The .mailrc test tries to define an alias in .mailrc in the home
directory by shell redirection, and then tries to see ~/.mailrc in
config is tilde-expanded by Git without help from shell.  So the
creation should become $HOME/ to be portable for shells that may
lack tilde expansion but the reference should be done as "~/.mailrc".

Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-05-27 13:03:44 -07:00
Allen Hubbe
3169e06daf send-email: add sendmail email aliases format
Teach send-email to read aliases in the sendmail aliases format, i.e.

	<alias>: <address|alias>[, <address|alias>...]

Examples:

	alice: Alice W Land <awol@example.com>
	bob: Robert Bobbyton <bob@example.com>
	# this is a comment
	   # this is also a comment
	chloe: chloe@example.com
	abgroup: alice, bob
	bcgrp: bob, chloe, Other <o@example.com>

 - Quoted aliases and quoted addresses are not supported.
 - Line continuations are not supported.

Warnings are printed for explicitly unsupported constructs, and any
other lines that are not matched by the parser.

Signed-off-by: Allen Hubbe <allenbh@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-05-27 13:01:48 -07:00
Junio C Hamano
b8767f791c diff.c: --ws-error-highlight=<kind> option
Traditionally, we only cared about whitespace breakages introduced
in new lines.  Some people want to paint whitespace breakages on old
lines, too.  When they see a whitespace breakage on a new line, they
can spot the same kind of whitespace breakage on the corresponding
old line and want to say "Ah, those breakages are there but they
were inherited from the original, so let's not touch them for now."

Introduce `--ws-error-highlight=<kind>` option, that lets them pass
a comma separated list of `old`, `new`, and `context` to specify
what lines to highlight whitespace errors on.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-05-26 23:00:01 -07:00
Junio C Hamano
38ccaf93bb Merge branch 'nd/untracked-cache'
Teach the index to optionally remember already seen untracked files
to speed up "git status" in a working tree with tons of cruft.

* nd/untracked-cache: (24 commits)
  git-status.txt: advertisement for untracked cache
  untracked cache: guard and disable on system changes
  mingw32: add uname()
  t7063: tests for untracked cache
  update-index: test the system before enabling untracked cache
  update-index: manually enable or disable untracked cache
  status: enable untracked cache
  untracked-cache: temporarily disable with $GIT_DISABLE_UNTRACKED_CACHE
  untracked cache: mark index dirty if untracked cache is updated
  untracked cache: print stats with $GIT_TRACE_UNTRACKED_STATS
  untracked cache: avoid racy timestamps
  read-cache.c: split racy stat test to a separate function
  untracked cache: invalidate at index addition or removal
  untracked cache: load from UNTR index extension
  untracked cache: save to an index extension
  ewah: add convenient wrapper ewah_serialize_strbuf()
  untracked cache: don't open non-existent .gitignore
  untracked cache: mark what dirs should be recursed/saved
  untracked cache: record/validate dir mtime and reuse cached output
  untracked cache: make a wrapper around {open,read,close}dir()
  ...
2015-05-26 13:24:46 -07:00
Junio C Hamano
22a1ae6ef2 Merge branch 'pt/pull-ff-vs-merge-ff'
The pull.ff configuration was supposed to override the merge.ff
configuration, but it didn't.

* pt/pull-ff-vs-merge-ff:
  pull: parse pull.ff as a bool or string
  pull: make pull.ff=true override merge.ff
2015-05-26 13:24:44 -07:00
Junio C Hamano
14230580af Merge branch 'pt/pull-log-n'
"git pull --log" and "git pull --no-log" worked as expected, but
"git pull --log=20" did not.

* pt/pull-log-n:
  pull: handle --log=<n>
2015-05-26 13:24:43 -07:00
Luke Diamand
f3b5b07c3c git-p4: tests: use test-chmtime in place of touch
Using "touch" for P4EDITOR means that the tests can be a bit
racy, since git-p4 checks the timestamp has been updated and
fails if the timestamp is not updated.

Use test-chmtime instead, which is designed for this.

Signed-off-by: Luke Diamand <luke@diamand.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-05-26 13:18:02 -07:00
Junio C Hamano
0ad782f240 t4015: separate common setup and per-test expectation
The last two tests in the script were to

 - set up color.diff.* slots
 - set up an expectation for a single test
 - run that test and check the result

but split in a wrong way.  It did the first two in the first test
and the third one in the second test.  The latter two belong to each
other.  This matters when you plan to add more of these tests that
share the common coloring.

While at it, make sure we use a color different from old, which is
also red.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-05-26 12:45:20 -07:00
Junio C Hamano
d55ef3e044 t4015: modernise style
Move the preparatory steps that create the expected output inside
the test bodies, remove unnecessary blank lines before and after the
test bodies, and drop SP between redirection operator and its target.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-05-26 12:45:20 -07:00
Junio C Hamano
636614f337 Merge branch 'jk/http-backend-deadlock-2.3' into jk/http-backend-deadlock
* jk/http-backend-deadlock-2.3:
  http-backend: spool ref negotiation requests to buffer
  t5551: factor out tag creation
  http-backend: fix die recursion with custom handler
2015-05-25 20:44:42 -07:00
Junio C Hamano
7419a03fdb Merge branch 'jk/http-backend-deadlock-2.2' into jk/http-backend-deadlock-2.3
* jk/http-backend-deadlock-2.2:
  http-backend: spool ref negotiation requests to buffer
  t5551: factor out tag creation
  http-backend: fix die recursion with custom handler
2015-05-25 20:44:04 -07:00
Jeff King
6bc0cb5176 http-backend: spool ref negotiation requests to buffer
When http-backend spawns "upload-pack" to do ref
negotiation, it streams the http request body to
upload-pack, who then streams the http response back to the
client as it reads. In theory, git can go full-duplex; the
client can consume our response while it is still sending
the request.  In practice, however, HTTP is a half-duplex
protocol. Even if our client is ready to read and write
simultaneously, we may have other HTTP infrastructure in the
way, including the webserver that spawns our CGI, or any
intermediate proxies.

In at least one documented case[1], this leads to deadlock
when trying a fetch over http. What happens is basically:

  1. Apache proxies the request to the CGI, http-backend.

  2. http-backend gzip-inflates the data and sends
     the result to upload-pack.

  3. upload-pack acts on the data and generates output over
     the pipe back to Apache. Apache isn't reading because
     it's busy writing (step 1).

This works fine most of the time, because the upload-pack
output ends up in a system pipe buffer, and Apache reads
it as soon as it finishes writing. But if both the request
and the response exceed the system pipe buffer size, then we
deadlock (Apache blocks writing to http-backend,
http-backend blocks writing to upload-pack, and upload-pack
blocks writing to Apache).

We need to break the deadlock by spooling either the input
or the output. In this case, it's ideal to spool the input,
because Apache does not start reading either stdout _or_
stderr until we have consumed all of the input. So until we
do so, we cannot even get an error message out to the
client.

The solution is fairly straight-forward: we read the request
body into an in-memory buffer in http-backend, freeing up
Apache, and then feed the data ourselves to upload-pack. But
there are a few important things to note:

  1. We limit the in-memory buffer to prevent an obvious
     denial-of-service attack. This is a new hard limit on
     requests, but it's unlikely to come into play. The
     default value is 10MB, which covers even the ridiculous
     100,000-ref negotation in the included test (that
     actually caps out just over 5MB). But it's configurable
     on the off chance that you don't mind spending some
     extra memory to make even ridiculous requests work.

  2. We must take care only to buffer when we have to. For
     pushes, the incoming packfile may be of arbitrary
     size, and we should connect the input directly to
     receive-pack. There's no deadlock problem here, though,
     because we do not produce any output until the whole
     packfile has been read.

     For upload-pack's initial ref advertisement, we
     similarly do not need to buffer. Even though we may
     generate a lot of output, there is no request body at
     all (i.e., it is a GET, not a POST).

[1] http://article.gmane.org/gmane.comp.version-control.git/269020

Test-adapted-from: Dennis Kaarsemaker <dennis@kaarsemaker.net>
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-05-25 20:43:18 -07:00
Luke Diamand
2dade7a7b2 git-p4: fix handling of multi-word P4EDITOR
This teaches git-p4 to pass the P4EDITOR variable to the
shell for expansion, so that any command-line arguments are
correctly handled. Without this, git-p4 can only launch the
editor if P4EDITOR is solely the path to the binary, without
any arguments.

This also adjusts t9805, which relied on the previous behaviour.

Suggested-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Luke Diamand <luke@diamand.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-05-24 11:50:12 -07:00
Luke Diamand
9afbb2dc37 git-p4: add failing test for P4EDITOR handling
Add test case that git-p4 handles a setting of P4EDITOR
that takes arguments, e.g. "gvim -f". This currently fails.

Signed-off-by: Luke Diamand <luke@diamand.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-05-24 11:50:12 -07:00
Fredrik Medley
68ee628932 upload-pack: optionally allow fetching reachable sha1
With uploadpack.allowReachableSHA1InWant configuration option set on the
server side, "git fetch" can make a request with a "want" line that names
an object that has not been advertised (likely to have been obtained out
of band or from a submodule pointer). Only objects reachable from the
branch tips, i.e. the union of advertised branches and branches hidden by
transfer.hideRefs, will be processed. Note that there is an associated
cost of having to walk back the history to check the reachability.

This feature can be used when obtaining the content of a certain commit,
for which the sha1 is known, without the need of cloning the whole
repository, especially if a shallow fetch is used. Useful cases are e.g.
repositories containing large files in the history, fetching only the
needed data for a submodule checkout, when sharing a sha1 without telling
which exact branch it belongs to and in Gerrit, if you think in terms of
commits instead of change numbers. (The Gerrit case has already been
solved through allowTipSHA1InWant as every Gerrit change has a ref.)

Signed-off-by: Fredrik Medley <fredrik.medley@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-05-22 18:25:36 -07:00
Junio C Hamano
ce6ab232ca Merge branch 'sb/t1020-cleanup'
There was a commented-out (instead of being marked to expect
failure) test that documented a breakage that was fixed since the
test was written; turn it into a proper test.

* sb/t1020-cleanup:
  subdirectory tests: code cleanup, uncomment test
2015-05-22 12:42:00 -07:00