When I do git fetch, git call file stats under .git/objects for each
refs. This takes time when there are many refs.
By enabling fscache, git takes file stats by directory traversing and that
improved the speed of fetch-pack for repository having large number of
refs.
In my windows workstation, this improves the time of `git fetch` for
chromium repository like below. I took stats 3 times.
* With this patch
TotalSeconds: 9.9825165
TotalSeconds: 9.1862075
TotalSeconds: 10.1956256
Avg: 9.78811653333333
* Without this patch
TotalSeconds: 15.8406702
TotalSeconds: 15.6248053
TotalSeconds: 15.2085938
Avg: 15.5580231
Signed-off-by: Takuto Ikuta <tikuta@chromium.org>
Git for Windows supports the core.longPaths config setting to allow
writing/reading long paths via the \\?\ trick for a long time now.
However, for that support to work, it is absolutely necessary that
git_default_config() is given a chance to parse the config. Otherwise
Git will be non the wiser.
So let's make sure that as many commands that previously failed to
parse the core.* settings now do that, implicitly enabling long path
support in a lot more places.
Note: this is not a perfect solution, and it cannot be, as there is
a chicken-and-egg problem in reading the config itself...
This fixes https://github.com/git-for-windows/git/issues/1218
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
From the documentation of said setting:
This boolean will enable fsync() when writing object files.
This is a total waste of time and effort on a filesystem that
orders data writes properly, but can be useful for filesystems
that do not use journalling (traditional UNIX filesystems) or
that only journal metadata and not file contents (OS X’s HFS+,
or Linux ext3 with "data=writeback").
The most common file system on Windows (NTFS) does not guarantee that
order, therefore a sudden loss of power (or any other event causing an
unclean shutdown) would cause corrupt files (i.e. files filled with
NULs). Therefore we need to change the default.
Note that the documentation makes it sound as if this causes really bad
performance. In reality, writing loose objects is something that is done
only rarely, and only a handful of files at a time.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
A ton of Git commands simply do not read (or at least parse) the core.*
settings. This is not good, as Git for Windows relies on the
core.longPaths setting to be read quite early on.
So let's just make sure that all commands read the config and give
platform_core_config() a chance.
This patch teaches tons of Git commands to respect the config setting
`core.longPaths = true`, including `pack-refs`, thereby fixing
https://github.com/git-for-windows/git/issues/1218
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Fix regression described in:
https://github.com/git-for-windows/git/issues/1392
which was introduced in:
b2353379bb
Problem Symptoms
================
When the user has a .gitignore file that is a symlink, the fscache
optimization introduced above caused the stat-data from the symlink,
rather that of the target file, to be returned. Later when the ignore
file was read, the buffer length did not match the stat.st_size field
and we called die("cannot use <path> as an exclude file")
Optimization Rationale
======================
The above optimization calls lstat() before open() primarily to ask
fscache if the file exists. It gets the current stat-data as a side
effect essentially for free (since we already have it in memory).
If the file does not exist, it does not need to call open(). And
since very few directories have .gitignore files, we can greatly
reduce time spent in the filesystem.
Discussion of Fix
=================
The above optimization calls lstat() rather than stat() because the
fscache only intercepts lstat() calls. Calls to stat() stay directed
to the mingw_stat() completly bypassing fscache. Furthermore, calls
to mingw_stat() always call {open, fstat, close} so that symlinks are
properly dereferenced, which adds *additional* open/close calls on top
of what the original code in dir.c is doing.
Since the problem only manifests for symlinks, we add code to overwrite
the stat-data when the path is a symlink. This preserves the effect of
the performance gains provided by the fscache in the normal case.
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Make fscache_enabled() function public rather than static.
Remove unneeded fscache_is_enabled() function.
Change is_fscache_enabled() macro to call fscache_enabled().
is_fscache_enabled() now takes a pathname so that the answer
is more precise and mean "is fscache enabled for this pathname",
since fscache only stores repo-relative paths and not absolute
paths, we can avoid attempting lookups for absolute paths.
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
The problem with not having, say, git-receive-pack.exe after a full
build is that the test suite will then happily use the *installed*
git-receive-pack.exe because it finds nothing else.
Absolutely not what we want. We want to have confidence that our test
covers the MSVC-built Git executables, and not some random stuff.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
The idea of the `vcxproj` target is to generate .sln/.vcxproj files and
then commit them, to be used elsewhere. Typically, this is done in a
VSTS job whenever `master` changes. So there is little use in
initializing vcpkg and building all the dependencies: they are not
necessary here.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
The `vcxproj` target does not, in fact, depend on MSVC being defined, so
let's just move it outside of that block.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
We just introduced a way to build Git for Windows with MSVC on the
command line using vcpkg-generated, up-to-date dependencies. Let's bring
that convenience to the Visual Studio project, too.
(The previous method, fetching NuGet packages, is fraught with problems:
as C++ libraries have to be built for every architecture and for every
toolset, the NuGet packages which we would like to consume fell behind
and are not up-to-date with the current versions of the libraries, e.g.
cURL and OpenSSL. By using vcpkg we avoid that problem, always building
the newest dependency versions.)
The trick is to initialize the VCPKG system once, and then build Git's
dependencies using it. We do that by attaching a pre-build event to the
libgit project (which is now the base project on which all others
depend, therefore no other project is built in paralleli, side-stepping
issues with vcpkg being unprepared for being run in parallel).
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
The .vcxproj's text nodes do not actually need to URL-encode double
quotes. So let's not do that.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
It really does depend on libgit. It does not hurt to let it depend on
xdiff, and it makes the code simpler.
It is necessary to get this dependency chain right, because we will
introduce a change where the vcpkg system is initialized before building
libgit. The vcpkg system will then build the dependencies needed by Git
(and thereby make the include headers available):
As the vcpkg system cannot be run in parallel (it does not lock,
wreaking havoc with files being accessed and written at the same time,
letting the vcpkg processes stumble over each others' toes. We prevent
that by ensuring that only one project is built at first: libgit. And
this project's PreBuildEvent will be used to initialize vcpkg and build
all dependencies. Subsequently, the other projects can be built in
parallel.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
As we do not consume NuGet packages any longer, there is no sense to try
to point PATH to their unpacked .dll files, either.
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Dependencies such as cURL and OpenSSL are necessary to build and run
Git. Previously, we obtained those dependencies by fetching NuGet
packages.
However, it is notoriously hard to keep NuGet packages of C/C++
libraries up-to-date, as the toolsets for different Visual Studio
versions are different, and the NuGet packages would have to ship them
all.
That is the reason why the NuGet packages we use are quite old, and even
insecure in the case of cURL and OpenSSL (the versions contain known
security flaws that have been addressed by later versions for which no
NuGet packages are available).
The better way to handle this situation is to use the vcpkg system:
https://github.com/Microsoft/vcpkg
The idea is that a single Git repository contains enough supporting
files to build up-to-date versions of a large number of Open Source
libraries on demand, including cURL and OpenSSL.
We integrate this system via four new .bat files to
1) initialize the vcpkg system,
2) build the packages,
4) set up Git's Makefile system to find the build artifacts, and
3) copy the artifacts into the top-level directory
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
The script assumes that we're in the top-level directory of the
checkout. That does not need to be true.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
One time too many did this developer call the `generate` script passing
a `--make-out=<PATH>` option that was happily ignored (because there
should be a space, not an equal sign, between `--make-out` and the
path).
And one time too many, this script not only ignored it but did not even
complain. Let's fix that.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
The option is deprecated now, and we better make sure that keeps saying
so until we finally remove it.
Suggested by Kevin Willford.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
It was a bad idea to just remove that option from Git for Windows
v2.15.0, as early users of that (still experimental) option would have
been puzzled what they are supposed to do now.
So let's reintroduce the flag, but make sure to show the user good
advice how to fix this going forward.
We'll remove this option in a more orderly fashion either in v2.16.0 or
in v2.17.0.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Teach read_directory_recursive() and add_excludes() to
be aware of optional fscache and avoid trying to open()
and fstat() non-existant ".gitignore" files in every
directory in the worktree.
The current code in add_excludes() calls open() and then
fstat() for a ".gitignore" file in each directory present
in the worktree. Change that when fscache is enabled to
call lstat() first and if present, call open().
This seems backwards because both lstat needs to do more
work than fstat. But when fscache is enabled, fscache will
already know if the .gitignore file exists and can completely
avoid the IO calls. This works because of the lstat diversion
to mingw_lstat when fscache is enabled.
This reduced status times on a 350K file enlistment of the
Windows repo on a NVMe SSD by 0.25 seconds.
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
We used to install into $HOME/bin/, which wreaks havoc with installed
versions of Git for Windows (because $HOME/bin is *prepended* to the
PATH, hence would override `git.exe` in Git Bash).
Let's align the MSVC case with the non-MSVC case and install into
/mingw64/bin/ (or /mingw32/bin/ in 32-bit Git for Windows SDKs) instead.
Noticed by Derrick Stolee.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
It was observed that the current implementation of of get_proc_addr()
fails to load the kernel32.dll with code ERROR_INVALID_PARAMETER.
Probably the reason is that kernel32.dll is already loaded. The
behavior was seen at Windows SP1, both 32bit and 64bit. Probably it
would behave same way in some or all other Windows versions.
This breaks all usages of "clone --local", including the automatic
tests where they call it.
The function CreateHardLink is available in all supported Windows
versions (since Windows XP), so there is no more need to resolve it
in runtime.
Signed-off-by: Max Kirillov <max@max630.net>
A very common assumption in Git's source code base is that
offset_1st_component() returns either 0 for relative paths, or 1 for
absolute paths that start with a slash. In other words, the return value
is either 0 or points just after the dir separator.
This assumption is not fulfilled when calling offset_1st_component()
e.g. on UNC paths on Windows, e.g. "//my-server/my-share". In this case,
offset_1st_component() returns the length of the entire string (which is
correct, because stripping the last "component" would not result in a
valid directory), yet the return value still does not point just after a
dir separator.
This assumption is most prominently seen in the
setup_git_directory_gently_1() function, where we want to append a
".git" component and simply assume that there is already a dir
separator. In the UNC example given above, this assumption is incorrect.
As a consequence, Git will fail to handle a worktree at the top of a UNC
share correctly.
Let's fix this by adding a dir separator specifically for that case: we
found that there is no first component in the path and it does not end
in a dir separator? Then add it.
This fixes https://github.com/git-for-windows/git/issues/1320
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
When running an external diff from, say, a diff tool, it is safe to
assume that we want to write the files in question. On Windows, that
means that there cannot be any other process holding an open handle to
said files.
So let's make sure that `git diff` itself is not holding any open handle
to the files in question.
This fixes https://github.com/git-for-windows/git/issues/1315
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
We have this loop where we try to remove the read-only attribute when
rename() fails and try again. If it fails again, let's not try to remove
the read-only attribute and try *again*.
This fixes https://github.com/git-for-windows/git/issues/1299
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
These changes are necessary to support better Git for Windows' new
auto-update feature.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
"Question?" is maybe not the most informative thing to ask. In the
absence of better information, it is the best we can do, of course.
However, Git for Windows' auto updater just learned the trick to use
git-gui--askyesno to ask the user whether to update now or not. And in
this scripted scenario, we can easily pass a command-line option to
change the window title.
So let's support that with the new `--title <title>` option.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
The text wrapping seems to be aligned to the right side of the Yes
button, leaving an awful lot of empty space.
Let's try to counter this by using pixel units.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Add .LIBs for zlib and openssl to <AdditionalDependencies>
to help linker when building with VS2017.
This closes https://github.com/git-for-windows/git/issues/1234
Note: this patch still leaves a couple of TODOs:
- It should be possible to add GEN.DEPS\lib to
<AdditionalLibraryDependencies> and then just set
<AdditionalDependencies> to the library basenames.
- Likewise, you should be able to copy GEN.DEPS\bin\*.dll
to the destination directory rather than using the full
paths in the $afterTargets lines.
(This is in line with items in <AdditionalIncludeDirectories>
referencing GEN.DEPS\include.)
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Toolset v120 corresponds to Visual Studio 2013. We already used
dependencies that were hardcoded to v140 (i.e. Visual Studio 2015), so
let's just remove the cruft.
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
This topic branch teaches Git to accept UNC paths of the form
file://host/share/repository.git.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Teach the top-level git Makefile to use whatever VS compiler
tool chain is installed on the system.
When building git from the command line in a git-sdk BASH
window with MAKE, the shell environment has environment
variables for GCC tools, but not MSVC tools. MSVC bindings
are only avaliable from the various "VcVarsAll.bat" scripts
run by the "Developer Command Prompt" shortcuts.
Add compat/vcbuild/find_vs_env.bat to the Makefile. It
uses the various "VcVarsAll.bat" scripts in a background
Developer Command Prompt process to compute the proper
environment variables and publish them for use by the Makefile.
[jes: fixed typos, used %SystemRoot% instead of C:\WINDOWS]
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Extend the parser to accept file://server/share/repo in the way that
Windows users expect it to be parsed who are used to referring to file
shares by UNC paths of the form \\server\share\folder.
[jes: tightened check to avoid handling file://C:/some/path as a UNC
path.]
This closes https://github.com/git-for-windows/git/issues/1264.
Signed-off-by: Torsten Bögershausen <tboegi@web.de>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
This topic branch brings slightly experimental changes supporting Git
for Windows to use BusyBox-w32 to execute its shell scripts as well as
its test suite.
The test suite can be run by installing the test artifacts into a MinGit
that has busybox.exe (and using Git for Windows' SDK's Perl for now, as
the test suite requires Perl even when NO_PERL is set, go figure) by
using the `install-mingit-test-artifacts` Makefile target with the
DESTDIR variable pointing to the top-level directory of the MinGit
installation.
To facilitate running the test suite (without having `make` available,
as `make.exe` is not part of MinGit), this branch brings an experimental
patch to the `test-run-command` helper to run Git's test suite. It is
still very experimental, though: in this developer's tests it seemed
that the `poll()` emulation required for `run_parallel_processes()` to
work sometimes hiccups on Windows, causing infinite "hangs". It is also
possible that BusyBox itself has problems writing to the pipes opened by
`test-run-command` (and merging this branch will help investigate
further). Caveat emptor.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Win32 CONDITION_VARIABLE has better performance and is easier to
maintain.
Since CONDITION_VARIABLE is not available in Windows XP and below,
old implementation of pthread_cond_t is kept under define guard
'GIT_WIN_XP_SUPPORT'. To enable old implementation, build with
make CFLAGS="-DGIT_WIN_XP_SUPPORT".
Signed-off-by: Loo Rong Jie <loorongjie@gmail.com>
fast-forwarded.
The Makefile target `install-mingit-test-artifacts` simply copies stuff
and things directly into a MinGit directory, including an init.bat
script to set everything up so that the tests can be run in a cmd
window.
Sadly, Git's test suite still relies on a Perl interpreter even if
compiled with NO_PERL=YesPlease. We punt for now, installing a small
script into /usr/bin/perl that hands off to an existing Perl of a Git
for Windows SDK.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
