Commit Graph

57355 Commits

Author SHA1 Message Date
Johannes Schindelin
e4347c9434 msvc: handle DEVELOPER=1
We frequently build Git using the `DEVELOPER=1` make setting as a
shortcut to enable all kinds of more stringent compiler warnings.

Those compiler warnings are relatively specific to GCC, though, so let's
try our best to translate them to the equivalent options to pass to MS
Visual C++'s `cl.exe`.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-06 09:07:44 +09:00
Johannes Schindelin
ed712ef8d5 msvc: ignore some libraries when linking
To build with MSVC, we "translate" GCC options to MSVC options, and part
of those options refer to the libraries to link into the final
executable. Currently, this part looks somewhat like this on Windows:

	-lcurl -lnghttp2 -lidn2 -lssl -lcrypto -lssl -lcrypto -lgdi32
	-lcrypt32 -lwldap32 -lz -lws2_32 -lexpat

Some of those are direct dependencies (such as curl and ssl) and others
are indirect (nghttp2 and idn2, for example, are dependencies of curl,
but need to be linked in for reasons).

We already handle the direct dependencies, e.g. `-liconv` is already
handled as adding `libiconv.lib` to the list of libraries to link
against.

Let's just ignore the remaining `-l*` options so that MSVC does not have
to warn us that it ignored e.g. the `/lnghttp2` option. We do that by
extending the clause that already "eats" the `-R*` options to also eat
the `-l*` options.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-06 09:07:44 +09:00
Johannes Schindelin
5b8f9e2417 compat/win32/path-utils.h: add #include guards
This adds the common guards that allow headers to be #include'd multiple
times.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-06 09:07:44 +09:00
Johannes Schindelin
41616ef618 winansi: use FLEX_ARRAY to avoid compiler warning
MSVC would complain thusly:

    C4200: nonstandard extension used: zero-sized array in struct/union

Let's just use the `FLEX_ARRAY` constant that we introduced for exactly
this type of scenario.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-06 09:07:44 +09:00
Johannes Schindelin
c097b95a26 msvc: avoid using minus operator on unsigned types
MSVC complains about this with `-Wall`, which can be taken as a sign
that this is indeed a real bug. The symptom is:

	C4146: unary minus operator applied to unsigned type, result
	still unsigned

Let's avoid this warning in the minimal way, e.g. writing `-1 -
<unsigned value>` instead of `-<unsigned value> - 1`.

Note that the change in the `estimate_cache_size()` function is
needed because MSVC considers the "return type" of the `sizeof()`
operator to be `size_t`, i.e. unsigned, and therefore it cannot be
negated using the unary minus operator.

Even worse, that arithmetic is doing extra work, in vain. We want to
calculate the entry extra cache size as the difference between the
size of the `cache_entry` structure minus the size of the
`ondisk_cache_entry` structure, padded to the appropriate alignment
boundary.

To that end, we start by assigning that difference to the `per_entry`
variable, and then abuse the `len` parameter of the
`align_padding_size()` macro to take the negative size of the ondisk
entry size. Essentially, we try to avoid passing the already calculated
difference to that macro by passing the operands of that difference
instead, when the macro expects operands of an addition:

	#define align_padding_size(size, len) \
		((size + (len) + 8) & ~7) - (size + len)

Currently, we pass A and -B to that macro instead of passing A - B and
0, where A - B is already stored in the `per_entry` variable, ready to
be used.

This is neither necessary, nor intuitive. Let's fix this, and have code
that is both easier to read and that also does not trigger MSVC's
warning.

While at it, we take care of reporting overflows (which are unlikely,
but hey, defensive programming is good!).

We _also_ take pains of casting the unsigned value to signed: otherwise,
the signed operand (i.e. the `-1`) would be cast to unsigned before
doing the arithmetic.

Helped-by: Denton Liu <liu.denton@gmail.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-06 09:07:44 +09:00
Johannes Schindelin
dfd557c978 stash apply: report status correctly even in a worktree's subdirectory
When Git wants to spawn a child Git process inside a worktree's
subdirectory while `GIT_DIR` is set, we need to take care of specifying
the work tree's top-level directory explicitly because it cannot be
discovered: the current directory is _not_ the top-level directory of
the work tree, and neither is it inside the parent directory of
`GIT_DIR`.

This fixes the problem where `git stash apply` would report pretty much
everything deleted or untracked when run inside a worktree's
subdirectory.

To make sure that we do not introduce the "reverse problem", i.e. when
`GIT_WORK_TREE` is defined but `GIT_DIR` is not, we simply make sure
that both are set.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-06 09:04:56 +09:00
Johannes Schindelin
d54dea77db fetch: let --jobs=<n> parallelize --multiple, too
So far, `--jobs=<n>` only parallelizes submodule fetches/clones, not
`--multiple` fetches, which is unintuitive, given that the option's name
does not say anything about submodules in particular.

Let's change that. With this patch, also fetches from multiple remotes
are parallelized.

For backwards-compatibility (and to prepare for a use case where
submodule and multiple-remote fetches may need different parallelization
limits), the config setting `submodule.fetchJobs` still only controls
the submodule part of `git fetch`, while the newly-introduced setting
`fetch.parallel` controls both (but can be overridden for submodules
with `submodule.fetchJobs`).

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-06 07:35:58 +09:00
Josh Steadmon
87db61a436 trace2: write discard message to sentinel files
Add a new "discard" event type for trace2 event destinations. When the
trace2 file count check creates a sentinel file, it will include the
normal trace2 output in the sentinel, along with this new discard
event.

Writing this message into the sentinel file is useful for tracking how
often the file count check triggers in practice.

Bump up the event format version since we've added a new event type.

Signed-off-by: Josh Steadmon <steadmon@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-05 17:53:51 +09:00
Josh Steadmon
83e57b04e6 trace2: discard new traces if target directory has too many files
trace2 can write files into a target directory. With heavy usage, this
directory can fill up with files, causing difficulty for
trace-processing systems.

This patch adds a config option (trace2.maxFiles) to set a maximum
number of files that trace2 will write to a target directory. The
following behavior is enabled when the maxFiles is set to a positive
integer:
  When trace2 would write a file to a target directory, first check
  whether or not the traces should be discarded. Traces should be
  discarded if:
    * there is a sentinel file declaring that there are too many files
    * OR, the number of files exceeds trace2.maxFiles.
  In the latter case, we create a sentinel file named git-trace2-discard
  to speed up future checks.

The assumption is that a separate trace-processing system is dealing
with the generated traces; once it processes and removes the sentinel
file, it should be safe to generate new trace files again.

The default value for trace2.maxFiles is zero, which disables the file
count check.

The config can also be overridden with a new environment variable:
GIT_TRACE2_MAX_FILES.

Signed-off-by: Josh Steadmon <steadmon@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-05 17:53:51 +09:00
Denton Liu
11c21f22de t4214: demonstrate octopus graph coloring failure
The graph coloring logic for octopus merges currently has a bug. This
can be seen git.git with 74c7cfa875 (Merge of
http://members.cox.net/junkio/git-jc.git, 2005-05-05), whose second
child is 211232bae6 (Octopus merge of the following five patches.,
2005-05-05).

If one runs

	git log --graph 74c7cfa875

one can see that the octopus merge is colored incorrectly. In
particular, the horizontal dashes are off by one color. Each horizontal
dash should be the color of the line to their bottom-right. Instead, they
are currently the color of the line to their bottom.

Demonstrate this breakage with a few sets of test cases. These test
cases should show not only simple cases of the bug occuring but trickier
situations that may not be handled properly in any attempt to fix the
bug.

While we're at it, include a passing test case as a canary in case an
attempt to fix the bug breaks existing operation.

Signed-off-by: Denton Liu <liu.denton@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-04 09:28:01 +09:00
Denton Liu
25eb905e14 t4214: explicitly list tags in log
In a future test case, we will be extending the commit graph. As a
result, explicitly list the tags that will generate the graph so that
when future additions are made, the current graph illustrations won't be
affected.

Signed-off-by: Denton Liu <liu.denton@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-04 09:28:00 +09:00
Denton Liu
63be8c8dd7 t4214: generate expect in their own test cases
Before, the expect files of the test case were being generated in the
setup method. However, it would make more sense to generate these files
within the test cases that actually use them so that it's obvious to
future readers where the expected values are coming from.

Move the generation of the expect files in their own respective test
cases.

While we're at it, we want to establish a pattern in this test suite
that, firstly, a non-colored test case is given then, immediately after,
the colored version is given.

Switch test cases "log --graph with tricky octopus merge, no color" and
"log --graph with tricky octopus merge with colors" so that the "no
color" version appears first.

This patch is best viewed with `--color-moved`.

Signed-off-by: Denton Liu <liu.denton@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-04 09:28:00 +09:00
Denton Liu
a7a5590c6e t4214: use test_merge
In the previous commit, we extended test_merge() so that it could
perform octopus merges. Now that the restriction is lifted, use
test_merge() to perform the octopus merge instead of manually
duplicating test_merge() functionality.

Signed-off-by: Denton Liu <liu.denton@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-04 09:28:00 +09:00
Denton Liu
94ba151300 test-lib: let test_merge() perform octopus merges
Currently test_merge() only allows developers to merge in one branch.
However, this restriction is artificial and there is no reason why it
needs to be this way.

Extend test_merge() to allow the specification of multiple branches so
that octopus merges can be performed.

Signed-off-by: Denton Liu <liu.denton@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-04 09:28:00 +09:00
Josh Steadmon
22541013d0 docs: clarify trace2 version invariants
Make it explicit that we always want trace2 "version" events to be the
first event of any trace session. Also list the changes that would or
would not cause the EVENT format version field to be incremented.

Signed-off-by: Josh Steadmon <steadmon@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-04 09:26:42 +09:00
Josh Steadmon
3d4548e7e2 docs: mention trace2 target-dir mode in git-config
Move the description of trace2's target-directory behavior into the
shared trace2-target-values file so that it is included in both the
git-config and api-trace2 docs. Leave the SID discussion only in
api-trace2 since it's a technical detail.

Signed-off-by: Josh Steadmon <steadmon@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-04 09:26:42 +09:00
René Scharfe
2fe44394c8 treewide: remove duplicate #include directives
Found with "git grep '^#include ' '*.c' | sort | uniq -d".

Signed-off-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-04 08:16:00 +09:00
Johannes Schindelin
dbcd970c27 push: do not pretend to return int from die_push_simple()
This function is marked as `NORETURN`, and it indeed does not want to
return anything. So let's not declare it with the return type `int`.
This fixes the following warning when building with MSVC:

	C4646: function declared with 'noreturn' has non-void return type

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-04 07:35:31 +09:00
Elijah Newren
941790d7de fast-export: handle nested tags
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-04 07:33:21 +09:00
Elijah Newren
8d7d33c1ce t9350: add tests for tags of things other than a commit
Multiple changes here:
  * add a test for a tag of a blob
  * add a test for a tag of a tag of a commit
  * add a comment to the tests for (possibly nested) tags of trees,
    making it clear that these tests are doing much less than you might
    expect

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-04 07:33:21 +09:00
Elijah Newren
a1638cfe12 fast-export: allow user to request tags be marked with --mark-tags
Add a new option, --mark-tags, which will output mark identifiers with
each tag object.  This improves the incremental export story with
--export-marks since it will allow us to record that annotated tags have
been exported, and it is also needed as a step towards supporting nested
tags.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-04 07:33:21 +09:00
Elijah Newren
208d69246e fast-export: add support for --import-marks-if-exists
fast-import has support for both an --import-marks flag and an
--import-marks-if-exists flag; the latter of which will not die() if the
file does not exist.  fast-export only had support for an --import-marks
flag; add an --import-marks-if-exists flag for consistency.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-04 07:33:21 +09:00
Elijah Newren
b8f50e5b60 fast-import: add support for new 'alias' command
fast-export and fast-import have nice --import-marks flags which allow
for incremental migrations.  However, if there is a mark in
fast-export's file of marks without a corresponding mark in the one for
fast-import, then we run the risk that fast-export tries to send new
objects relative to the mark it knows which fast-import does not,
causing fast-import to fail.

This arises in practice when there is a filter of some sort running
between the fast-export and fast-import processes which prunes some
commits programmatically.  Provide such a filter with the ability to
alias pruned commits to their most recent non-pruned ancestor.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-04 07:33:21 +09:00
Elijah Newren
f73b2aba05 fast-import: allow tags to be identified by mark labels
Mark identifiers are used in fast-export and fast-import to provide a
label to refer to earlier content.  Blobs are given labels because they
need to be referenced in the commits where they first appear with a
given filename, and commits are given labels because they can be the
parents of other commits.  Tags were never given labels, probably
because they were viewed as unnecessary, but that presents two problems:

   1. It leaves us without a way of referring to previous tags if we
      want to create a tag of a tag (or higher nestings).
   2. It leaves us with no way of recording that a tag has already been
      imported when using --export-marks and --import-marks.

Fix these problems by allowing an optional mark label for tags.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-04 07:33:21 +09:00
Elijah Newren
3164e6bd24 fast-import: fix handling of deleted tags
If our input stream includes a tag which is later deleted, we were not
properly deleting it.  We did have a step which would delete it, but we
left a tag in the tag list noting that it needed to be updated, and the
updating of annotated tags occurred AFTER ref deletion.  So, when we
record that a tag needs to be deleted, also remove it from the list of
annotated tags to update.

While this has likely been something that has not happened in practice,
it will come up more in order to support nested tags.  For nested tags,
we either need to give temporary names to the intermediate tags and then
delete them, or else we need to use the final name for the intermediate
tags.  If we use the final name for the intermediate tags, then in order
to keep the sanity check that someone doesn't try to update the same tag
twice, we need to delete the ref after creating the intermediate tag.
So, either way nested tags imply the need to delete temporary inner tag
references.

Helped-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-04 07:33:21 +09:00
Kunal Tyagi
8085050ab4 add -i: show progress counter in the prompt
Report the current hunk count and total number of hunks for the
current file in the prompt.  Also adjust the expected output in
some tests to match.

Signed-off-by: Kunal Tyagi <tyagi.kunal@live.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-04 07:12:19 +09:00
Pratyush Yadav
69fdb922ad Merge branch 'bw/diff3-conflict-style'
git-gui now highlights diff3 style conflicts properly. As an auxiliary
change, querying a path's attribute is done via the existing interface
instead of hand-rolling the code.

* bw/diff3-conflict-style:
  git-gui: support for diff3 conflict style
  git-gui: use existing interface to query a path's attribute
2019-10-04 03:27:53 +05:30
Bert Wesarg
b436825b9b git-gui: support for diff3 conflict style
This adds highlight support for the diff3 conflict style.

The common pre-image will be reversed to --, because it has been removed
and replaced with ours or theirs side respectively.

Signed-off-by: Bert Wesarg <bert.wesarg@googlemail.com>
Signed-off-by: Pratyush Yadav <me@yadavpratyush.com>
2019-10-04 03:26:15 +05:30
Johannes Schindelin
937b76ed49 range-diff: internally force diff.noprefix=true
When parsing the diffs, `range-diff` expects to see the prefixes `a/`
and `b/` in the diff headers.

These prefixes can be forced off via the config setting
`diff.noprefix=true`. As `range-diff` is not prepared for that
situation, this will cause a segmentation fault.

Let's avoid that by passing the `--no-prefix` option to the `git log`
process that generates the diffs that `range-diff` wants to parse.
And of course expect the output to have no prefixes, then.

Reported-by: Michal Suchánek <msuchanek@suse.de>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-03 11:10:33 +09:00
Johannes Schindelin
411e4f4735 ci: run hdr-check as part of the Static Analysis job
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-03 10:34:57 +09:00
Josh Steadmon
25e4b8099c push: add trace2 instrumentation
Add trace2 regions in transport.c and builtin/push.c to better track
time spent in various phases of pushing:

* Listing refs
* Checking submodules
* Pushing submodules
* Pushing refs

Signed-off-by: Josh Steadmon <steadmon@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-03 10:13:18 +09:00
Josh Steadmon
5fc31180d8 fetch: add trace2 instrumentation
Add trace2 regions to fetch-pack.c and builtins/fetch.c to better track
time spent in the various phases of a fetch:

* listing refs
* negotiation for protocol versions v0-v2
* fetching refs
* consuming refs

Signed-off-by: Josh Steadmon <steadmon@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-03 10:13:17 +09:00
Jeff King
53d687bf5f git_mkstemps_mode(): replace magic numbers with computed value
The magic number "6" appears several times in the function, and is
related to the size of the "XXXXXX" string we expect to find in the
template. Let's pull that "XXXXXX" into a constant array, whose size we
can get at compile time with ARRAY_SIZE().

Note that we probably can't just change this value, since callers will
be feeding us a certain number of X's, but it hopefully makes the
function itself easier to follow.

While we're here, let's do the same with the "letters" array (which we
_could_ modify if we wanted to include more characters).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-03 09:58:25 +09:00
Bert Wesarg
c3b57dc2a0 git-gui: use existing interface to query a path's attribute
Replace the hand-coded call to git check-attr with the already provided one.

Signed-off-by: Bert Wesarg <bert.wesarg@googlemail.com>
Signed-off-by: Pratyush Yadav <me@yadavpratyush.com>
2019-10-03 05:00:04 +05:30
Pratyush Yadav
45ab460d4a Merge branch 'js/git-bash-if-available'
git-gui will now use git-bash instead of bash on Windows, if it is
available.

* js/git-bash-if-available:
  git-gui (Windows): use git-bash.exe if it is available
2019-10-03 04:41:58 +05:30
Garima Singh
0bd7f578b2 commit-graph: emit trace2 cmd_mode for each sub-command
Emit trace2_cmd_mode() messages for each commit-graph
sub-command.

The commit graph commands were in flux when trace2 was
making it's way to git. Now that we have enough sub-commands
in commit-graph, we can label the various modes within them.
Distinguishing between read, write and verify is a great
start.

Signed-off-by: Garima Singh <garima.singh@microsoft.com>
Acked-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-02 18:36:19 +09:00
Alexandr Miloslavskiy
71f4960b91 t0061: fix test for argv[0] with spaces (MINGW only)
The test was originally designed for the case where user reported
that setting GIT_SSH to a .bat file with spaces in path fails on
Windows: https://github.com/git-for-windows/git/issues/692

The test has two different problems:

1. It succeeds with AND without fix eb7c7863 that addressed user's
   problem. This happens because the core problem was misunderstood,
   leading to conclusion that git is unable to start any programs with
   spaces in path on Win7. But in fact
     a) Bug only affected cmd.exe scripts, such as .bat scripts
     b) Bug only happened when cmd.exe received at least two quoted args
     c) Bug happened on any Windows (verified on Win10).
   Therefore, correct test must involve .bat script and two quoted args.
2. In Visual Studio build, it fails to run, because 'test-fake-ssh.exe'
   is copied away from its dependencies 'libiconv.dll' and 'zlib1.dll'.

Fix both problems by using .bat script instead of 'test-fake-ssh.exe'.
NOTE: With this change, the test now correctly fails without eb7c7863.

Signed-off-by: Alexandr Miloslavskiy <alexandr.miloslavskiy@syntevo.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-02 15:14:51 +09:00
Alex Henrie
54a80a9ad8 wrapper: use a loop instead of repetitive statements
A check into the history of this code revealed no particular reason for
the code to be written in this way. All popular compilers are capable of
unrolling loops if it benefits performance, and once this code is
replaced with a loop, the magic number 6 used in multiple places in this
function can be replaced with a named constant.

Reviewed-by: Derrick Stolee <stolee@gmail.com>
Reviewed-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Reviewed-by: Jeff King <peff@peff.net>
Signed-off-by: Alex Henrie <alexhenrie24@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-02 15:04:23 +09:00
Alex Henrie
baed6bbb5b diffcore-break: use a goto instead of a redundant if statement
The condition "if (q->nr <= j)" checks whether the loop exited normally
or via a break statement. Avoid this check by replacing the jump out of
the inner loop with a jump to the end of the outer loop, which makes it
obvious that diff_q is not executed when the peer survives.

Signed-off-by: Alex Henrie <alexhenrie24@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-02 15:04:21 +09:00
Alex Henrie
8da02ce62a commit-graph: remove a duplicate assignment
Leave the variable 'g' uninitialized before it is set just before its
first use in front of a loop, which is a much more appropriate place to
indicate what it is used for.

Also initialize the variable 'num_commits' just before the loop instead
of at the beginning of the function for the same reason.

Reviewed-by: Derrick Stolee <stolee@gmail.com>
Signed-off-by: Alex Henrie <alexhenrie24@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-02 15:04:16 +09:00
Ali Utku Selen
ddb3c856f3 shallow.c: don't free unallocated slabs
Fix possible segfault when cloning a submodule shallow.

Signed-off-by: Ali Utku Selen <auselen@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-02 15:03:47 +09:00
Elijah Newren
8e4ec3376e merge-recursive: fix the diff3 common ancestor label for virtual commits
In commit 743474cbfa ("merge-recursive: provide a better label for
diff3 common ancestor", 2019-08-17), the label for the common ancestor
was changed from always being

         "merged common ancestors"

to instead be based on the number of merge bases:

    >=2: "merged common ancestors"
      1: <abbreviated commit hash>
      0: "<empty tree>"

Unfortunately, this did not take into account that when we have a single
merge base, that merge base could be fake or constructed.  In such
cases, this resulted in a label of "00000000".  Of course, the previous
label of "merged common ancestors" was also misleading for this case.
Since we have an API that is explicitly about creating fake merge base
commits in merge_recursive_generic(), we should provide a better label
when using that API with one merge base.  So, when
merge_recursive_generic() is called with one merge base, set the label
to:

         "constructed merge base"

Note that callers of merge_recursive_generic() include the builtin
commands git-am (in combination with git apply --build-fake-ancestor),
git-merge-recursive, and git-stash.

Helped-by: Jeff King <peff@peff.net>
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-02 14:59:29 +09:00
Emily Shaffer
65904b8b2b promisor-remote: skip move_to_tail when no-op
Previously, when promisor_remote_move_to_tail() is called for a
promisor_remote which is currently the final element in promisors, a
cycle is created in the promisors linked list. This cycle leads to a
double free later on in promisor_remote_clear() when the final element
of the promisors list is removed: promisors is set to promisors->next (a
no-op, as promisors->next == promisors); the previous value of promisors
is free()'d; then the new value of promisors (which is equal to the
previous value of promisors) is also free()'d. This double-free error
was unrecoverable for the user without removing the filter or re-cloning
the repo and hoping to miss this edge case.

Now, when promisor_remote_move_to_tail() would be a no-op, just do a
no-op. In cases of promisor_remote_move_to_tail() where r is not already
at the tail of the list, it works as before.

Helped-by: Jeff King <peff@peff.net>
Signed-off-by: Emily Shaffer <emilyshaffer@google.com>
Acked-by: Christian Couder <christian.couder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-02 14:56:54 +09:00
Johannes Schindelin
2049b8dc65 diffcore_rename(): use a stable sort
During Git's rename detection, the file names are sorted. At the moment,
this job is performed by `qsort()`. As that function is not guaranteed
to implement a stable sort algorithm, this can lead to inconsistent
and/or surprising behavior: a rename might be detected differently
depending on the platform where Git was run.

The `qsort()` in MS Visual C's runtime does _not_ implement a stable
sort algorithm, and it even leads to an inconsistency leading to a test
failure in t3030.35 "merge-recursive remembers the names of all base
trees": a different code path than on Linux is taken in the rename
detection of an ambiguous rename between either `e` to `a` or
`a~Temporary merge branch 2_0` to `a` during a recursive merge,
unexpectedly resulting in a clean merge.

Let's use the stable sort provided by `git_stable_qsort()` to avoid this
inconsistency.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-02 14:44:54 +09:00
Johannes Schindelin
97fff61012 Move git_sort(), a stable sort, into into libgit.a
The `qsort()` function is not guaranteed to be stable, i.e. it does not
promise to maintain the order of items it is told to consider equal. In
contrast, the `git_sort()` function we carry in `compat/qsort.c` _is_
stable, by virtue of implementing a merge sort algorithm.

In preparation for using a stable sort in Git's rename detection, move
the stable sort into `libgit.a` so that it is compiled in
unconditionally, and rename it to `git_stable_qsort()`.

Note: this also makes the hack obsolete that was introduced in
fe21c6b285 (mingw: reencode environment variables on the fly (UTF-16
<-> UTF-8), 2018-10-30), where we included `compat/qsort.c` directly in
`compat/mingw.c` to use the stable sort.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-02 14:44:51 +09:00
Elijah Newren
69f272b922 dir: special case check for the possibility that pathspec is NULL
Commits 404ebceda0 ("dir: also check directories for matching
pathspecs", 2019-09-17) and 89a1f4aaf7 ("dir: if our pathspec might
match files under a dir, recurse into it", 2019-09-17) added calls to
match_pathspec() and do_match_pathspec() passing along their pathspec
parameter.  Both match_pathspec() and do_match_pathspec() assume the
pathspec argument they are given is non-NULL.  It turns out that
unpack-tree.c's verify_clean_subdirectory() calls read_directory() with
pathspec == NULL, and it is possible on case insensitive filesystems for
that NULL to make it to these new calls to match_pathspec() and
do_match_pathspec().  Add appropriate checks on the NULLness of pathspec
to avoid a segfault.

In case the negation throws anyone off (one of the calls was to
do_match_pathspec() while the other was to !match_pathspec(), yet no
negation of the NULLness of pathspec is used), there are two ways to
understand the differences:
  * The code already handled the pathspec == NULL cases before this
    series, and this series only tried to change behavior when there was
    a pathspec, thus we only want to go into the if-block if pathspec is
    non-NULL.
  * One of the calls is for whether to recurse into a subdirectory, the
    other is for after we've recursed into it for whether we want to
    remove the subdirectory itself (i.e. the subdirectory didn't match
    but something under it could have).  That difference in situation
    leads to the slight differences in logic used (well, that and the
    slightly unusual fact that we don't want empty pathspecs to remove
    untracked directories by default).

Denton found and analyzed one issue and provided the patch for the
match_pathspec() call, SZEDER figured out why the issue only reproduced
for some folks and not others and provided the testcase, and I looked
through the remainder of the series and noted the do_match_pathspec()
call that should have the same check.

Co-authored-by: Denton Liu <liu.denton@gmail.com>
Co-authored-by: SZEDER Gábor <szeder.dev@gmail.com>
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-02 12:06:58 +09:00
Thomas Klaeger
6a72d44fc2 git-gui (Windows): use git-bash.exe if it is available
Git for Windows 2.x ships with an executable that starts the Git Bash
with all the environment variables and what not properly set up. It is
also adjusted according to the Terminal emulator option chosen when
installing Git for Windows (while `bash.exe --login -i` would always
launch with Windows' default console).

So let's use that executable (usually C:\Program Files\Git\git-bash.exe)
instead of `bash.exe --login -i` if its presence was detected.

This fixes https://github.com/git-for-windows/git/issues/490

Signed-off-by: Thomas Kläger <thomas.klaeger@10a.ch>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Pratyush Yadav <me@yadavpratyush.com>
2019-10-01 19:10:34 +05:30
Junio C Hamano
bc12974a89 Fourth batch
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-09-30 13:30:46 +09:00
Junio C Hamano
5a5350940b Merge branch 'ds/commit-graph-on-fetch'
A configuration variable tells "git fetch" to write the commit
graph after finishing.

* ds/commit-graph-on-fetch:
  fetch: add fetch.writeCommitGraph config setting
2019-09-30 13:19:32 +09:00
Junio C Hamano
974bdb0205 Merge branch 'bw/rebase-autostash-keep-current-branch'
"git rebase --autostash <upstream> <branch>", when <branch> is
different from the current branch, incorrectly moved the tip of the
current branch, which has been corrected.

* bw/rebase-autostash-keep-current-branch:
  builtin/rebase.c: Remove pointless message
  builtin/rebase.c: make sure the active branch isn't moved when autostashing
2019-09-30 13:19:32 +09:00