| Commit message (Collapse) | Author | Age | Files | Lines |
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Instead of forcing iconv support on macOS (by forcing `USE_ICONV`
on), honor the `USE_ICONV` option only on macOS.
Although macOS includes iconv by default, some macOS users may have a
deficient installation for some reason and they should be provided a
workaround to use libgit2 even in this situation.
iconv support is now disabled entirely on non-macOS platforms. No other
platform supports core.precomposeunicode, and iconv should never be
linked.
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Under some circumstances the installed / system version of zlib may not
be desirable due to being too old or buggy. This patch adds the option
`USE_BUNDLED_ZLIB` that will cause the bundled version of zlib to be
used.
We may also want to add similar functionality to allow the user to
select other bundled 3rd-party dependencies instead of using the system
versions.
/cc @pks-t @ethomson
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patch_parse: implement state machine for parsing patch headers
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Patches which contain exact renames only will not contain an actual diff
body, but only a list of files that were renamed. Thus, the patch header
is immediately followed by the terminating sequence "-- ". We currently
do not recognize this character sequence as a possible terminating
sequence. Add it and create a test to catch the failure.
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Our code parsing Git patch headers is rather lax in parsing headers of a
Git-style patch. Most notably, we do not care for the exact order in
which header lines appear and as such, we may parse patch files which
are not really valid after all. Furthermore, the state transitions
inside of the parser are not as obvious as they could be, making it
harder than required to follow its logic.
To improve upon this situation, this patch introduces a real state
machine to parse the patches. Instead of simply parsing each line
without caring for previous state and the exact ordering, we define a
set of states with their allowed transitions. This makes the patch
parser more strict in only allowing valid successions of header lines.
As the transition table is defined inside of a single structure with
the expected line, required state as well as the state that we end up
in, all state transitions are immediately obvious from just having a
look at this structure. This improves both maintainability and eases
reasoning about the patch parser.
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CMake: make HTTPS support more generic
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This allows us to only link against CoreFoundation when using the SecureTransport backend
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It defaults to ON, e.g. "pick whatever default is appropriate for the platform".
It accepts one of SecureTransport, OpenSSL, WinHTTP, or OFF.
It errors if the backend library couldn't be found.
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ignore spaces in .gitignore files
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For sections we will still use the existing one even if the case disagrees, but
the variable always gets written with the case given by the caller.
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Implement a diff indent heuristic
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`inline` is not portable enough, and the `xdiff` code doesn't import
the `GIT_INLINE` macro. So introduce a new `XDL_INLINE` macro (with
the same definition as `GIT_INLINE`). Use the new macro to inline two
functions in `xdiffi.c`.
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Commit a49895b593 (xdl_change_compact(): introduce the concept
of a change group, 2016-08-22) added a "struct group" type
to xdiff/xdiffi.c. But the POSIX system header "grp.h"
already defines "struct group" (it is part of the getgrnam
interface).
Let's resolve by giving the xdiff variant a scoped name,
which is closer to other xdiff types anyway (e.g.,
xdlfile_t, though note that xdiff is fond if typedefs when
Git usually is not).
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Some groups of added/deleted lines in diffs can be slid up or down,
because lines at the edges of the group are not unique. Picking good
shifts for such groups is not a matter of correctness but definitely has
a big effect on aesthetics. For example, consider the following two
diffs. The first is what standard Git emits:
--- a/9c572b21dd090a1e5c5bb397053bf8043ffe7fb4:git-send-email.perl
+++ b/6dcfa306f2b67b733a7eb2d7ded1bc9987809edb:git-send-email.perl
@@ -231,6 +231,9 @@ if (!defined $initial_reply_to && $prompting) {
}
if (!$smtp_server) {
+ $smtp_server = $repo->config('sendemail.smtpserver');
+}
+if (!$smtp_server) {
foreach (qw( /usr/sbin/sendmail /usr/lib/sendmail )) {
if (-x $_) {
$smtp_server = $_;
The following diff is equivalent, but is obviously preferable from an
aesthetic point of view:
--- a/9c572b21dd090a1e5c5bb397053bf8043ffe7fb4:git-send-email.perl
+++ b/6dcfa306f2b67b733a7eb2d7ded1bc9987809edb:git-send-email.perl
@@ -230,6 +230,9 @@ if (!defined $initial_reply_to && $prompting) {
$initial_reply_to =~ s/(^\s+|\s+$)//g;
}
+if (!$smtp_server) {
+ $smtp_server = $repo->config('sendemail.smtpserver');
+}
if (!$smtp_server) {
foreach (qw( /usr/sbin/sendmail /usr/lib/sendmail )) {
if (-x $_) {
This patch teaches Git to pick better positions for such "diff sliders"
using heuristics that take the positions of nearby blank lines and the
indentation of nearby lines into account.
The existing Git code basically always shifts such "sliders" as far down
in the file as possible. The only exception is when the slider can be
aligned with a group of changed lines in the other file, in which case
Git favors depicting the change as one add+delete block rather than one
add and a slightly offset delete block. This naive algorithm often
yields ugly diffs.
Commit d634d61ed6 improved the situation somewhat by preferring to
position add/delete groups to make their last line a blank line, when
that is possible. This heuristic does more good than harm, but (1) it
can only help if there are blank lines in the right places, and (2)
always picks the last blank line, even if there are others that might be
better. The end result is that it makes perhaps 1/3 as many errors as
the default Git algorithm, but that still leaves a lot of ugly diffs.
This commit implements a new and much better heuristic for picking
optimal "slider" positions using the following approach: First observe
that each hypothetical positioning of a diff slider introduces two
splits: one between the context lines preceding the group and the first
added/deleted line, and the other between the last added/deleted line
and the first line of context following it. It tries to find the
positioning that creates the least bad splits.
Splits are evaluated based only on the presence and locations of nearby
blank lines, and the indentation of lines near the split. Basically, it
prefers to introduce splits adjacent to blank lines, between lines that
are indented less, and between lines with the same level of indentation.
In more detail:
1. It measures the following characteristics of a proposed splitting
position in a `struct split_measurement`:
* the number of blank lines above the proposed split
* whether the line directly after the split is blank
* the number of blank lines following that line
* the indentation of the nearest non-blank line above the split
* the indentation of the line directly below the split
* the indentation of the nearest non-blank line after that line
2. It combines the measured attributes using a bunch of
empirically-optimized weighting factors to derive a `struct
split_score` that measures the "badness" of splitting the text at
that position.
3. It combines the `split_score` for the top and the bottom of the
slider at each of its possible positions, and selects the position
that has the best `split_score`.
I determined the initial set of weighting factors by collecting a corpus
of Git histories from 29 open-source software projects in various
programming languages. I generated many diffs from this corpus, and
determined the best positioning "by eye" for about 6600 diff sliders. I
used about half of the repositories in the corpus (corresponding to
about 2/3 of the sliders) as a training set, and optimized the weights
against this corpus using a crude automated search of the parameter
space to get the best agreement with the manually-determined values.
Then I tested the resulting heuristic against the full corpus. The
results are summarized in the following table, in column `indent-1`:
| repository | count | Git 2.9.0 | compaction | compaction-fixed | indent-1 | indent-2 |
| --------------------- | ----- | -------------- | -------------- | ---------------- | -------------- | -------------- |
| afnetworking | 109 | 89 (81.7%) | 37 (33.9%) | 37 (33.9%) | 2 (1.8%) | 2 (1.8%) |
| alamofire | 30 | 18 (60.0%) | 14 (46.7%) | 15 (50.0%) | 0 (0.0%) | 0 (0.0%) |
| angular | 184 | 127 (69.0%) | 39 (21.2%) | 23 (12.5%) | 5 (2.7%) | 5 (2.7%) |
| animate | 313 | 2 (0.6%) | 2 (0.6%) | 2 (0.6%) | 2 (0.6%) | 2 (0.6%) |
| ant | 380 | 356 (93.7%) | 152 (40.0%) | 148 (38.9%) | 15 (3.9%) | 15 (3.9%) | *
| bugzilla | 306 | 263 (85.9%) | 109 (35.6%) | 99 (32.4%) | 14 (4.6%) | 15 (4.9%) | *
| corefx | 126 | 91 (72.2%) | 22 (17.5%) | 21 (16.7%) | 6 (4.8%) | 6 (4.8%) |
| couchdb | 78 | 44 (56.4%) | 26 (33.3%) | 28 (35.9%) | 6 (7.7%) | 6 (7.7%) | *
| cpython | 937 | 158 (16.9%) | 50 (5.3%) | 49 (5.2%) | 5 (0.5%) | 5 (0.5%) | *
| discourse | 160 | 95 (59.4%) | 42 (26.2%) | 36 (22.5%) | 18 (11.2%) | 13 (8.1%) |
| docker | 307 | 194 (63.2%) | 198 (64.5%) | 253 (82.4%) | 8 (2.6%) | 8 (2.6%) | *
| electron | 163 | 132 (81.0%) | 38 (23.3%) | 39 (23.9%) | 6 (3.7%) | 6 (3.7%) |
| git | 536 | 470 (87.7%) | 73 (13.6%) | 78 (14.6%) | 16 (3.0%) | 16 (3.0%) | *
| gitflow | 127 | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) |
| ionic | 133 | 89 (66.9%) | 29 (21.8%) | 38 (28.6%) | 1 (0.8%) | 1 (0.8%) |
| ipython | 482 | 362 (75.1%) | 167 (34.6%) | 169 (35.1%) | 11 (2.3%) | 11 (2.3%) | *
| junit | 161 | 147 (91.3%) | 67 (41.6%) | 66 (41.0%) | 1 (0.6%) | 1 (0.6%) | *
| lighttable | 15 | 5 (33.3%) | 0 (0.0%) | 2 (13.3%) | 0 (0.0%) | 0 (0.0%) |
| magit | 88 | 75 (85.2%) | 11 (12.5%) | 9 (10.2%) | 1 (1.1%) | 0 (0.0%) |
| neural-style | 28 | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) |
| nodejs | 781 | 649 (83.1%) | 118 (15.1%) | 111 (14.2%) | 4 (0.5%) | 5 (0.6%) | *
| phpmyadmin | 491 | 481 (98.0%) | 75 (15.3%) | 48 (9.8%) | 2 (0.4%) | 2 (0.4%) | *
| react-native | 168 | 130 (77.4%) | 79 (47.0%) | 81 (48.2%) | 0 (0.0%) | 0 (0.0%) |
| rust | 171 | 128 (74.9%) | 30 (17.5%) | 27 (15.8%) | 16 (9.4%) | 14 (8.2%) |
| spark | 186 | 149 (80.1%) | 52 (28.0%) | 52 (28.0%) | 2 (1.1%) | 2 (1.1%) |
| tensorflow | 115 | 66 (57.4%) | 48 (41.7%) | 48 (41.7%) | 5 (4.3%) | 5 (4.3%) |
| test-more | 19 | 15 (78.9%) | 2 (10.5%) | 2 (10.5%) | 1 (5.3%) | 1 (5.3%) | *
| test-unit | 51 | 34 (66.7%) | 14 (27.5%) | 8 (15.7%) | 2 (3.9%) | 2 (3.9%) | *
| xmonad | 23 | 22 (95.7%) | 2 (8.7%) | 2 (8.7%) | 1 (4.3%) | 1 (4.3%) | *
| --------------------- | ----- | -------------- | -------------- | ---------------- | -------------- | -------------- |
| totals | 6668 | 4391 (65.9%) | 1496 (22.4%) | 1491 (22.4%) | 150 (2.2%) | 144 (2.2%) |
| totals (training set) | 4552 | 3195 (70.2%) | 1053 (23.1%) | 1061 (23.3%) | 86 (1.9%) | 88 (1.9%) |
| totals (test set) | 2116 | 1196 (56.5%) | 443 (20.9%) | 430 (20.3%) | 64 (3.0%) | 56 (2.6%) |
In this table, the numbers are the count and percentage of human-rated
sliders that the corresponding algorithm got *wrong*. The columns are
* "repository" - the name of the repository used. I used the diffs
between successive non-merge commits on the HEAD branch of the
corresponding repository.
* "count" - the number of sliders that were human-rated. I chose most,
but not all, sliders to rate from those among which the various
algorithms gave different answers.
* "Git 2.9.0" - the default algorithm used by `git diff` in Git 2.9.0.
* "compaction" - the heuristic used by `git diff --compaction-heuristic`
in Git 2.9.0.
* "compaction-fixed" - the heuristic used by `git diff
--compaction-heuristic` after the fixes from earlier in this patch
series. Note that the results are not dramatically different than
those for "compaction". Both produce non-ideal diffs only about 1/3 as
often as the default `git diff`.
* "indent-1" - the new `--indent-heuristic` algorithm, using the first
set of weighting factors, determined as described above.
* "indent-2" - the new `--indent-heuristic` algorithm, using the final
set of weighting factors, determined as described below.
* `*` - indicates that repo was part of training set used to determine
the first set of weighting factors.
The fact that the heuristic performed nearly as well on the test set as
on the training set in column "indent-1" is a good indication that the
heuristic was not over-trained. Given that fact, I ran a second round of
optimization, using the entire corpus as the training set. The resulting
set of weights gave the results in column "indent-2". These are the
weights included in this patch.
The final result gives consistently and significantly better results
across the whole corpus than either `git diff` or `git diff
--compaction-heuristic`. It makes only about 1/30 as many errors as the
former and about 1/10 as many errors as the latter. (And a good fraction
of the remaining errors are for diffs that involve weirdly-formatted
code, sometimes apparently machine-generated.)
The tools that were used to do this optimization and analysis, along
with the human-generated data values, are recorded in a separate project
[1].
[1] https://github.com/mhagger/diff-slider-tools
Original Git commit: 433860f3d0beb0c6f205290bd16cda413148f098
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The idea of xdl_change_compact() is fairly simple:
* Proceed through groups of changed lines in the file to be compacted,
keeping track of the corresponding location in the "other" file.
* If possible, slide the group up and down to try to give the most
aesthetically pleasing diff. Whenever it is slid, the current location
in the other file needs to be adjusted.
But these simple concepts are obfuscated by a lot of index handling that
is written in terse, subtle, and varied patterns. I found it very hard
to convince myself that the function was correct.
So introduce a "struct group" that represents a group of changed lines
in a file. Add some functions that perform elementary operations on
groups:
* Initialize a group to the first group in a file
* Move to the next or previous group in a file
* Slide a group up or down
Even though the resulting code is longer, I think it is easier to
understand and review. Its performance is not changed
appreciably (though it would be if `group_next()` and `group_previous()`
were not inlined).
...and in fact, the rewriting helped me discover another bug in the
--compaction-heuristic code: The update of blank_lines was never done
for the highest possible position of the group. This means that it could
fail to slide the group to its highest possible position, even if that
position had a blank line as its last line. So for example, it yielded
the following diff:
$ git diff --no-index --compaction-heuristic a.txt b.txt
diff --git a/a.txt b/b.txt
index e53969f..0d60c5fe 100644
--- a/a.txt
+++ b/b.txt
@@ -1,3 +1,7 @@
1
A
+
+B
+
+A
2
when in fact the following diff is better (according to the rules of
--compaction-heuristic):
$ git diff --no-index --compaction-heuristic a.txt b.txt
diff --git a/a.txt b/b.txt
index e53969f..0d60c5fe 100644
--- a/a.txt
+++ b/b.txt
@@ -1,3 +1,7 @@
1
+A
+
+B
+
A
2
The new code gives the bottom answer.
Original Git commit: e8adf23d1ee97b57c8aea32ee8365203b77c0e42
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There is no reason for it to take an array and two indexes as argument,
as it only accesses two elements of the array.
Original Git commit: 152598cbb667471c8f5be16e199922a41452b2d5
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It is a common pattern in xdl_change_compact to check that hashes and
strings match. The resulting code to perform this change causes very
long lines and makes it hard to follow the intention. Introduce a helper
function recs_match which performs both checks to increase
code readability.
Original Git commit: 92e5b62fec0e9b647429e8d3736c571c434dd375
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When trying to decode the private key it looks like LibSSH2 returns a
LIBSSH2_ERROR_PUBLICKEY_UNVERIFIED when the passphrase is incorrect.
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Due to our split of CMake files into multiple modules, we had to replace
some uses of the `${CMAKE_CURRENT_SOURCE_DIR}` and
`${CMAKE_CURRENT_BINARY_DIR}` variables and replace them with
`${CMAKE_SOURCE_DIR}` and `${CMAKE_BINARY_DIR}`. This enabled us to
still be able to refer to top-level files when defining build
instructions inside of a subdirectory.
When replacing all variables, it was assumed that the absolute set of
variables is always relative to the current project. But in fact, this
is not the case, as these variables always point to the source and
binary directory as given by the top-levl project. So the change
actually broke the ability to include libgit2 directly as a subproject,
as source files cannot be found anymore.
Fix this by instead using project-specific source and binary directories
with `${libgit2_SOURCE_DIR}` and `${libgit2_BINARY_DIR}`.
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cmake: fix linking in Xcode with object libraries only
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CMake is unable to generate a correct Xcode project when trying to link
libraries with only object libraries as its input. As our new build
infrastructure makes heavy use of object libraries now, this affects our
libgit2 library target, as well, leading to linking errors.
Fix the issue by adding a dummy file to the libgit2 objects. As we
always have the "features.h" header ready which contains defines only,
we can simply link it into the resulting library without any effect
whatsoever. This fixes building with Xcode.
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transports: smart: fix memory leak when skipping symbolic refs
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When we setup the revision walk for negotiating references with a
remote, we iterate over all references, ignoring tags and symbolic
references. While skipping over symbolic references, we forget to free
the looked up reference, resulting in a memory leak when the next
iteration simply overwrites the variable.
Fix that issue by freeing the reference at the beginning of each
iteration and collapsing return paths for error and success.
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Next to the "gitdir" conditional for including other configuration
files, there's also a "gitdir/i" conditional. In contrast to the former
one, path matching with "gitdir/i" is done case-insensitively. This
commit implements the case-insensitive condition.
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Upstream git.git has implemented the ability to include other
configuration files based on conditions. Right now, this only includes
the ability to include a file based on the gitdir-location of the
repository the currently parsed configuration file belongs to. This
commit implements handling these conditional includes for the
case-sensitive "gitdir" condition.
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The reader machinery will be extended to handle conditional includes.
The only conditions that currently exist all match the against the git
directory of the repository the config file belongs to. As such, we need
to have access to the repository when reading configuration files to
properly handle these conditions.
One specialty of thes conditional includes is that the actual pattern
may also be a relative pattern starting with "./". In this case, we have
to match the pattern against the path relative to the config file which
is currently being parsed. So besides the repository, we also have to
pass down the path to the current config file that is being parsed.
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The logic inside this function will be required later on, when
implementing conditional includes. Extract it into its own function to
ease the implementation.
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Our current configuration logic is completely oblivious of any
repository, but only cares for actual file paths. Unfortunately, we are
forced to break this assumption by the introduction of conditional
includes, which are evaluated in the context of a repository. Right now,
only one conditional exists with "gitdir:" -- it will only include the
configuration if the current repository's git directory matches the
value passed to "gitdir:".
To support these conditionals, we have to break our API and make the
repository available when opening a configuration file. This commit
extends the `open` call of configuration backends to include another
repository and adjusts existing code to have it available. This includes
the user-visible functions `git_config_add_file_ondisk` and
`git_config_add_backend`.
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Several functions to retrieve variables from a repository only return
immutable values, which allows us to actually constify the passed-in
repository parameter. Do so to help a later patch, which will only have
access to a constant repository.
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This function has previously been implemented in Windows-specific path
handling code as `path__is_dirsep`. As we will need this functionality
in other parts, extract the logic into "path.h" alongside with a
non-Windows implementation.
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This function has previously been implemented in Windows-specific path
handling code as `path__is_absolute`. As we will need this functionality
in other parts, extract the logic into "path.h" alongside with a
non-Windows implementation.
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Checkout typechange-only deltas
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On Windows, we do not support file mode changes, so do not test
for type changes between the disk and tree being checked out.
We could have false positives since the on-disk file can only have
an (effective) mode of 0100644 since NTFS does not support executable
files. If the tree being checked out did have an executable file,
we would erroneously decide that the file on disk had been changed.
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When performing a forced checkout, treat files as modified when the
workdir or the index is identical except for the mode. This ensures
that force checkout will update the mode to the target. (Apply this
check for regular files only, if one of the items was a file and the
other was another type of item then this would be a typechange and
handled independently.)
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Plug some leaks in curl's proxy handling
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When we duplicate a user-provided options struct, we're stuck with freeing the
url in it. In case we add stuff to the proxy struct, let's add a function in
which to put the logic.
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refs: do not use peeled OID if peeling to a tag
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