This just makes things compile, the test suite needs extra tender loving
care in addition to this change. We will address these issues in later
commits.
While at it, also allow building MSys2 Git (i.e. a Git that uses MSys2's
POSIX emulation layer).
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Git for Windows lags a little bit behind with the 2.x releases because
the Git for Windows developers wanted to let that big jump coincide with
a well-needed overhaul of the context within which Git for Windows is
developed.
To understand why this is such a big issue, it needs to be noted that
many parts of Git are not written in portable C, but instead relies on a
POSIX shell and Perl to be available. Even in the portable C part, there
is the ingrained notion that we can work with UTF-8 encoded strings.
To support the scripts, Git for Windows has to ship a minimal POSIX
emulation layer with Bash and Perl thrown in, and when the Git for
Windows effort started originally, in August 2007, we settled on using
MSys, a stripped down version of Cygwin. Consequently, the original name
of the project was "msysGit" (which, sadly, caused a *lot* of confusion
because few Windows users know about MSys, and even less care).
To compile the C code of Git for Windows, we used MSys, too: it sports
an additional version of the GNU C Compiler that targets the plain
Win32 API (with a few convenience functions thrown in) instead of the
POSIX emulation layer that would require the MSys runtime to run the
compiled programs. That way, Git for Windows' executable(s) are really
just Win32 programs. To discern executables requiring the POSIX
emulation layer from the ones that do not, the latter are called MinGW
(Minimal GNU for Windows) when the former are called MSys executables.
This reliance on MSys incurred challenges, too, though: some of our
changes to the MSys runtime -- necessary to support Git for Windows
better -- were not accepted upstream, the MSys runtime was not developed
further to support e.g. UTF-8 or 64-bit, and apart from not having a
package management system until much later (when mingw-get was
introduced), many packages provided by the MSys/MinGW project lag behind
the respective source code versions, in particular Bash and OpenSSL. For
a while, the Git for Windows project tried to remedy the situation by
trying to build newer versions of those packages, but the situation
quickly became untenable, especially with problems like the Heartbleed
bug requiring swift action and Git for Windows contributors being scarce
-- despite millions of downloads suggesting that there are many users.
After a brief push in the direction of mingw-get, thanks to the
long-time contributor and co-maintainer Sebastian Schuberth, it became
clear that we need to look for alternatives.
Happily, in the meantime the MSys2 project (https://msys2.github.io/)
emerged, and was chosen to be the base of the Git for Windows 2.x. MSys2
is a rewrite of the spirit of MSys: it is again a stripped down version
of Cygwin, but it is actively kept up-to-date with Cygwin's source code.
Thereby, it already supports Unicode internally, and it also offers the
64-bit support that we yearned for since the beginning of the Git for
Windows project.
MSys2 also ported the Pacman package management system from Arch Linux
and uses it heavily. This brings the same convenience to which Linux
users are used to from `yum` or `apt-get`, and to which MacOSX users are
used to from Homebrew or MacPorts, or BSD users from the Ports system,
to MSys2: a simple `pacman -Syu` will update all installed packages to
the newest versions currently available.
MSys2 is also *very* active, typically providing package updates
multiple times per week.
It still required a two-month effort to bring everything to a state
where Git's test suite passes, and a couple of patches await their
submission to the respective upstream projects. Yet without MSys2, the
modernization of Git for Windows would simply not have happened.
This commit lays the ground work to supporting MSys2-based Git builds.
Assisted-by: Waldek Maleska <weakcamel@users.github.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
squash! config.mak.uname: support MSys2
Make sure that the nedmalloc patch is applied before.
With MSys2's GCC, `ReadWriteBarrier` is already defined, and FORCEINLINE
unfortunately gets defined incorrectly.
Let's work around both problems, using the MSys2-specific
__MINGW64_VERSION_MAJOR constant to guard them.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
The excellent MSys2 project brings a substantially updated MinGW
environment including newer GCC versions and new headers. To support
compiling Git, let's special-case the new MinGW (tell-tale: the
_MINGW64_VERSION_MAJOR constant is defined).
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
MSys2's strace facility is very useful for debugging... With this patch,
the bash will be executed through strace if the environment variable
GIT_STRACE_COMMANDS is set, which comes in real handy when investigating
issues in the test suite.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
This way the libraries get properly installed into the "site_perl"
directory and we just have to move them out of the "mingw" directory.
Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>
On Windows, we would like to be able to have a default http.sslCAinfo
that points to an MSys path (i.e. relative to the installation root of
Git). As Git is a MinGW program, it has to handle the conversion
of the MSys path into a MinGW32 path itself.
Since system_path() considers paths starting with '/' as absolute, we
have to convince it to make a Windows path by stripping the leading
slash.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Windows paths are typically limited to MAX_PATH = 260 characters, even
though the underlying NTFS file system supports paths up to 32,767 chars.
This limitation is also evident in Windows Explorer, cmd.exe and many
other applications (including IDEs).
Particularly annoying is that most Windows APIs return bogus error codes
if a relative path only barely exceeds MAX_PATH in conjunction with the
current directory, e.g. ERROR_PATH_NOT_FOUND / ENOENT instead of the
infinitely more helpful ERROR_FILENAME_EXCED_RANGE / ENAMETOOLONG.
Many Windows wide char APIs support longer than MAX_PATH paths through the
file namespace prefix ('\\?\' or '\\?\UNC\') followed by an absolute path.
Notable exceptions include functions dealing with executables and the
current directory (CreateProcess, LoadLibrary, Get/SetCurrentDirectory) as
well as the entire shell API (ShellExecute, SHGetSpecialFolderPath...).
Introduce a handle_long_path function to check the length of a specified
path properly (and fail with ENAMETOOLONG), and to optionally expand long
paths using the '\\?\' file namespace prefix. Short paths will not be
modified, so we don't need to worry about device names (NUL, CON, AUX).
Contrary to MSDN docs, the GetFullPathNameW function doesn't seem to be
limited to MAX_PATH (at least not on Win7), so we can use it to do the
heavy lifting of the conversion (translate '/' to '\', eliminate '.' and
'..', and make an absolute path).
Add long path error checking to xutftowcs_path for APIs with hard MAX_PATH
limit.
Add a new MAX_LONG_PATH constant and xutftowcs_long_path function for APIs
that support long paths.
While improved error checking is always active, long paths support must be
explicitly enabled via 'core.longpaths' option. This is to prevent end
users to shoot themselves in the foot by checking out files that Windows
Explorer, cmd/bash or their favorite IDE cannot handle.
Test suite:
Test the case is when the full pathname length of a dir is close
to 260 (MAX_PATH).
Bug report and an original reproducer by Andrey Rogozhnikov:
https://github.com/msysgit/git/pull/122#issuecomment-43604199
[jes: adjusted test number to avoid conflicts, reinstated && chain]
Thanks-to: Martin W. Kirst <maki@bitkings.de>
Thanks-to: Doug Kelly <dougk.ff7@gmail.com>
Signed-off-by: Karsten Blees <blees@dcon.de>
Original-test-by: Andrey Rogozhnikov <rogozhnikov.andrey@gmail.com>
Signed-off-by: Stepan Kasal <kasal@ucw.cz>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Windows paths are typically limited to MAX_PATH = 260 characters, even
though the underlying NTFS file system supports paths up to 32,767 chars.
This limitation is also evident in Windows Explorer, cmd.exe and many
other applications (including IDEs).
Particularly annoying is that most Windows APIs return bogus error codes
if a relative path only barely exceeds MAX_PATH in conjunction with the
current directory, e.g. ERROR_PATH_NOT_FOUND / ENOENT instead of the
infinitely more helpful ERROR_FILENAME_EXCED_RANGE / ENAMETOOLONG.
Many Windows wide char APIs support longer than MAX_PATH paths through the
file namespace prefix ('\\?\' or '\\?\UNC\') followed by an absolute path.
Notable exceptions include functions dealing with executables and the
current directory (CreateProcess, LoadLibrary, Get/SetCurrentDirectory) as
well as the entire shell API (ShellExecute, SHGetSpecialFolderPath...).
Introduce a handle_long_path function to check the length of a specified
path properly (and fail with ENAMETOOLONG), and to optionally expand long
paths using the '\\?\' file namespace prefix. Short paths will not be
modified, so we don't need to worry about device names (NUL, CON, AUX).
Contrary to MSDN docs, the GetFullPathNameW function doesn't seem to be
limited to MAX_PATH (at least not on Win7), so we can use it to do the
heavy lifting of the conversion (translate '/' to '\', eliminate '.' and
'..', and make an absolute path).
Add long path error checking to xutftowcs_path for APIs with hard MAX_PATH
limit.
Add a new MAX_LONG_PATH constant and xutftowcs_long_path function for APIs
that support long paths.
While improved error checking is always active, long paths support must be
explicitly enabled via 'core.longpaths' option. This is to prevent end
users to shoot themselves in the foot by checking out files that Windows
Explorer, cmd/bash or their favorite IDE cannot handle.
Test suite:
Test the case is when the full pathname length of a dir is close
to 260 (MAX_PATH).
Bug report and an original reproducer by Andrey Rogozhnikov:
https://github.com/msysgit/git/pull/122#issuecomment-43604199
[jes: adjusted test number to avoid conflicts]
Thanks-to: Martin W. Kirst <maki@bitkings.de>
Thanks-to: Doug Kelly <dougk.ff7@gmail.com>
Signed-off-by: Karsten Blees <blees@dcon.de>
Original-test-by: Andrey Rogozhnikov <rogozhnikov.andrey@gmail.com>
Signed-off-by: Stepan Kasal <kasal@ucw.cz>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
[jes: adusted test number to avoid conflicts, fixed non-portable use of
the 'export' statement]
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
If multiple threads access a directory that is not yet in the cache, the
directory will be loaded by each thread. Only one of the results is added
to the cache, all others are leaked. This wastes performance and memory.
On cache miss, add a future object to the cache to indicate that the
directory is currently being loaded. Subsequent threads register themselves
with the future object and wait. When the first thread has loaded the
directory, it replaces the future object with the result and notifies
waiting threads.
Signed-off-by: Karsten Blees <blees@dcon.de>
Checking the work tree status is quite slow on Windows, due to slow lstat
emulation (git calls lstat once for each file in the index). Windows
operating system APIs seem to be much better at scanning the status
of entire directories than checking single files.
Add an lstat implementation that uses a cache for lstat data. Cache misses
read the entire parent directory and add it to the cache. Subsequent lstat
calls for the same directory are served directly from the cache.
Also implement opendir / readdir / closedir so that they create and use
directory listings in the cache.
The cache doesn't track file system changes and doesn't plug into any
modifying file APIs, so it has to be explicitly enabled for git functions
that don't modify the working copy.
Note: in an earlier version of this patch, the cache was always active and
tracked file system changes via ReadDirectoryChangesW. However, this was
much more complex and had negative impact on the performance of modifying
git commands such as 'git checkout'.
Signed-off-by: Karsten Blees <blees@dcon.de>
Add a macro to mark code sections that only read from the file system,
along with a config option and documentation.
This facilitates implementation of relatively simple file system level
caches without the need to synchronize with the file system.
Enable read-only sections for 'git status' and preload_index.
Signed-off-by: Karsten Blees <blees@dcon.de>
Emulating the POSIX lstat API on Windows via GetFileAttributes[Ex] is quite
slow. Windows operating system APIs seem to be much better at scanning the
status of entire directories than checking single files. A caching
implementation may improve performance by bulk-reading entire directories
or reusing data obtained via opendir / readdir.
Make the lstat implementation pluggable so that it can be switched at
runtime, e.g. based on a config option.
Signed-off-by: Karsten Blees <blees@dcon.de>
Emulating the POSIX dirent API on Windows via FindFirstFile/FindNextFile is
pretty staightforward, however, most of the information provided in the
WIN32_FIND_DATA structure is thrown away in the process. A more
sophisticated implementation may cache this data, e.g. for later reuse in
calls to lstat.
Make the dirent implementation pluggable so that it can be switched at
runtime, e.g. based on a config option.
Define a base DIR structure with pointers to readdir/closedir that match
the opendir implementation (i.e. similar to vtable pointers in OOP).
Define readdir/closedir so that they call the function pointers in the DIR
structure. This allows to choose the opendir implementation on a
call-by-call basis.
Move the fixed sized dirent.d_name buffer to the dirent-specific DIR
structure, as d_name may be implementation specific (e.g. a caching
implementation may just set d_name to point into the cache instead of
copying the entire file name string).
Signed-off-by: Karsten Blees <blees@dcon.de>
When building the `doc` with `asciidoctor`, `asciidoctor` complains about
a nested code block in a callout list. This is a really dirty solution to
restore the callout list to function properly. There is a minimal visual
sideeffect; the *immitated* codeblock has no overall greyish background.
Instead the individual lines have it.
Note: When building this patch with `asciidoc` the background is totally
gone but the font is still monospaced.
Signed-off-by: nalla <nalla@hamal.uberspace.de>
The `user-manual.txt` ist designed as a `book` but the `Makefile` wants to
build it as an `article`. This seems to be a problem when building the
documentation with `asciidoctor`. Furthermore the parts *Git Glossary*
and *Apendix B* had no subsections which is not allowed when building with
`asciidoctor`. So lets add a *dummy* section.
Signed-off-by: nalla <nalla@hamal.uberspace.de>
With msysGit the .git directory is supposed to be hidden, unless it is
a bare git repository. Test this.
Signed-off-by: Pat Thoyts <patthoyts@users.sourceforge.net>
At least for cross-platform projects, it makes sense to hide the
files starting with a dot, as this is the behavior on Unix/MacOSX.
However, at least Eclipse has problems interpreting the hidden flag
correctly, so the default is to hide only the .git/ directory.
The config setting core.hideDotFiles therefore supports not only
'true' and 'false', but also 'dotGitOnly'.
[jes: clarified the commit message, made git init respect the setting
by marking the .git/ directory only after reading the config, and added
documentation, and rebased on top of current junio/next]
Signed-off-by: Erik Faye-Lund <kusmabite@gmail.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
This topic branch addresses the bug where Git for Windows 2.x' Git GUI
failed to generate a working shortcut via Repository>Create Desktop
Shortcut.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
When calling `Repository>Create Desktop Shortcut`, Git GUI assumes
that it is okay to call `wish.exe` directly on Windows. However, in
Git for Windows 2.x' context, that leaves several crucial environment
variables uninitialized, resulting in a shortcut that does not work.
To fix those environment variable woes, Git for Windows comes with a
convenient `git-gui.exe`, so let's just use it when it is available.
This fixes https://github.com/git-for-windows/git/issues/448
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
MSys2 might *look* like Cygwin, but it is *not* Cygwin... Unless it
is run with `MSYSTEM=MSYS`, that is.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
This topic branch fixes the "is inside work tree" test when it fails
solely due to lower/upper case differences despite the config setting
`core.ignoreCase = true` (Git for Windows' default).
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
`$HOME/bin/` is quite convenient a place to put user-specific Git
helpers, such as credential or remote helpers.
When run in Git Bash, it is therefore already appended to the PATH;
Let's do the equivalent when run in Git CMD: when `git.exe` is
called, Git is told to look also for scripts and programs in
`$HOME/bin` (this does not modify Git CMD's `PATH`, of course).
This fixes https://github.com/git-for-windows/git/issues/429
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Git has a config variable to indicate that it is operating on a file
system that is case-insensitive: core.ignoreCase. But the
`dir_inside_of()` function did not respect that. As a result, if Git's
idea of the current working directory disagreed in its upper/lower case
from the `GIT_WORK_TREE` variable (e.g. `C:\test` vs `c:\test`) the
user would be greeted by the error message
fatal: git-am cannot be used without a working tree.
when trying to run a rebase.
This fixes https://github.com/git-for-windows/git/issues/402 (reported by
Daniel Harding).
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
When `git clone` is asked to dissociate the repository from the
reference repository whose objects were used, it is quite possible that
the pack files need to be repacked. In that case, the pack files need to
be deleted that were originally hard-links to the reference repository's
pack files.
On platforms where a file cannot be deleted if another process still
holds a handle on it, we therefore need to take pains to release all
pack files and indexes before dissociating.
This fixes https://github.com/git-for-windows/git/issues/446
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
This makes sure that Git's idea of the current working directory matches
what is recorded on disk (which should be the same as Git's idea).
This helps in particular PowerShell users where the current working
directory can differ in case from what's stored on disk.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
The quoting rules of `cmd.exe` are really, really quirky. In particular,
if there are more than two quotes, the entire set of rules changes. That
is the reason why
CMD /C "C:\Program Files\Git\usr\bin\bash.exe" -l -i
works, but
CMD /C "C:\Program Files\Git\usr\bin\bash.exe" -l -i "test.sh"
fails with this error message:
'C:\Program' is not recognized as an internal or external command,
operable program or batch file.
The recommended fix is to pass the /S option to `cmd.exe` and surround
the entire command-line by an extra set of quotes. And here lies the
rub: for that to work, we have to append an extra quote. At the end of
the command-line. *After* the last argument was appended, if any.
This commit supports that use case by introducing the option
"APPEND_QUOTE". The intended usage is to use the following string
resource:
SHOW_CONSOLE=1 APPEND_QUOTE=1
@@COMSPEC@@ /S /C \"\"@@EXEPATH@@\\usr\\bin\\bash.exe\" --login -i
(Note that there are only three quotes on that command-line, the fourth
to be appended due to the `APPEND_QUOTE` setting.)
This is (1/3) to fix https://github.com/git-for-windows/git/issues/396
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
We no longer use any of MSVCRT's stat-functions, so there's no need to
stick to a CRT-compatible 'struct stat' either.
Define and use our own POSIX-2013-compatible 'struct stat' with nanosecond-
precision file times.
Note: Due to performance issues when using git variants with different file
time resolutions, this patch does *not* yet enable nanosecond precision in
the Makefile (use 'make USE_NSEC=1').
Signed-off-by: Karsten Blees <blees@dcon.de>
fstat() is the only stat-related CRT function for which we don't have a
full replacement yet (and thus the only reason to stick with MSVCRT's
'struct stat' definition).
Fully implement fstat(), in preparation of implementing a POSIX 2013
compatible 'struct stat' with nanosecond-precision file times.
Signed-off-by: Karsten Blees <blees@dcon.de>
This was probably missed because nobody had a left-over `trash/`
directory and the `-f` flag made sure that no error message was
produced when the file was not found that *actually* wanted to
be removed.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
