In a push to polish Git for Windows more, we are moving away from
scripts toward proper binaries.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
The Git wrapper does one thing, and does it well: setting up the
environment required to run Git and its scripts, and then hand off to
another program.
We already do this for the Git executable itself; in Git for Windows'
context, we have exactly the same need also when calling the Git Bash or
Git CMD. However, both are tied to what particular shell environment you
use, though: MSys or MSys2 (or whatever else cunning developers make
work for them). This means that the Git Bash and Git CMD need to be
compiled in the respective context (e.g. when compiling the
mingw-w64-git package in the MSys2 context).
Happily, Windows offers a way to configure compiled executables:
resources. So let's just look whether the current executable has a
string resource and use it as the command-line to execute after the
environment is set up. To support MSys2's Git Bash better (where
`mintty` should, but might not, be available), we verify whether the
specified executable exists, and keep looking for string resources if it
does not.
For even more flexibility, we expand environment variables specified as
`@@<VARIABLE-NAME>@@`, and for convenience `@@EXEPATH@@` expands into
the directory in which the executable resides.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Otherwise the output of Git commands cannot be caught by, say, Git GUI
(because it is running detached from any console, which would make
`git.exe` inherit the standard handles implicitly).
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
We are about to use the Git wrapper to call the Git Bash of Git for
Windows. All the wrapper needs to do for that is to set up the
environment variables, use the home directory as working directory and
then hand off to a user-specified command-line.
We prepare the existing code for this change by introducing flags to set
up the environment variables, to launch a non-Git program, and to use
the home directory as working directory.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
The original purpose of the Git wrapper is to run from inside Git for
Windows' /cmd/ directory, to allow setting up some environment variables
before Git is allowed to take over.
Due to differences in the file system layout, MSys2 requires some
changes for that to work.
In addition, we must take care to set the `MSYSTEM` environment variable
to `MINGW32` or `MINGW64`, respectively, to allow MSys2 to be configured
correctly in case Git launches a shell or Perl script.
We also need to change the `TERM` variable to `cygwin` instead of
`msys`, otherwise the pager `less.exe` (spawned e.g. by `git log`) will
simply crash with a message similar to this one:
1 [main] less 9832 cygwin_exception::open_stackdumpfile:
Dumping stack trace to less.exe.stackdump
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
This reduces the disk footprint of a full Git for Windows setup
dramatically because on Windows, one cannot assume that hard links are
supported.
The net savings are calculated easily: the 32-bit `git.exe` file weighs
in with 7662 kB while the `git-wrapper.exe` file (modified to serve as a
drop-in replacement for builtins) weighs a scant 21 kB. At this point,
there are 109 builtins which results in a total of 813 MB disk space
being freed up by this commit.
Yes, that is really more than half a gigabyte.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Git started out as a bunch of separate commands, in the true Unix spirit.
Over time, more and more functionality was shared between the different
Git commands, though, so it made sense to introduce the notion of
"builtins": programs that are actually integrated into the main Git
executable.
These builtins can be called in two ways: either by specifying a
subcommand as the first command-line argument, or -- for backwards
compatibility -- by calling the Git executable hardlinked to a filename
of the form "git-<subcommand>". Example: the "log" command can be called
via "git log <parameters>" or via "git-log <parameters>". The latter
form is actually deprecated and only supported for scripts; calling
"git-log" interactively will not even work by default because the
libexec/git-core/ directory is not in the PATH.
All of this is well and groovy as long as hard links are supported.
Sadly, this is not the case in general on Windows. So it actually hurts
quite a bit when you have to fall back to copying all of git.exe's
currently 7.5MB 109 times, just for backwards compatibility.
The simple solution would be to install really trivial shell script
wrappers in place of the builtins:
for builtin in $BUILTINS
do
rm git-$builtin.exe
printf '#!/bin/sh\nexec git %s "$@"\n' $builtin > git-builtin
chmod a+x git-builtin
done
This method would work -- even on Windows because Git for Windows ships a
full-fledged Bash. However, the Windows Bash comes at a price: it needs to
spin up a full-fledged POSIX emulation layer everytime it starts.
Therefore, the shell script solution would incur a significant performance
penalty.
The best solution the Git for Windows team could come up with is to extend
the Git wrapper -- that is needed to call Git from cmd.exe anyway, and
that weighs in with a scant 19KB -- to also serve as a drop-in replacement
for the builtins so that the following workaround is satisfactory:
for builtin in $BUILTINS
do
cp git-wrapper.exe git-$builtin.exe
done
This commit allows for this, by extending the module file parsing to
turn builtin command names like `git-log.exe ...` into calls to the main
Git executable: `git.exe log ...`.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
This prepares the wrapper for modifications to serve as a drop-in
replacement for the builtins.
This commit's diff is best viewed with the `-w` flag.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
We take care to embed the manifest, too, because we will modify the
wrapper in the next few commits to serve as a drop-in replacement for
the built-ins, i.e. we will want to call the wrapper under names such
as 'git-patch-id.exe', too.
To allow 32-bit and 64-bit builds in the same directory, we let
git-wrapper.o depend on GIT-PREFIX so that it gets recompiled when
compiling for a different architecture.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
On Windows, Git is faced by the challenge that it has to set up certain
environment variables before running Git under special circumstances
such as when Git is called directly from cmd.exe (i.e. outside any
Bash environment).
This source code was taken from msysGit's commit 74a198d:
https://github.com/msysgit/msysgit/blob/74a198d/src/git-wrapper/git-wrapper.c
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Many a test requires either POSIXPERM (to change the executable bit) or
SYMLINKS, and neither are available on Windows.
This lets t9100-git-svn-basic.sh pass in Git for Windows' SDK.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
When running "git blame $path" with unnormalized data in the index
for the path, the data in the working tree was blamed, even though
"git add" would not have changed what is already in the index, due
to "safe crlf" that disables the line-end conversion. It has been
corrected.
* tb/blame-force-read-cache-to-workaround-safe-crlf:
correct blame for files commited with CRLF
"git send-pack --all <there>" was broken when its command line
option parsing was written in the 2.6 timeframe.
* sk/send-pack-all-fix:
git-send-pack: fix --all option when used with directory
"git diff -M" used to work better when two originally identical
files A and B got renamed to X/A and X/B by pairing A to X/A and B
to X/B, but this was broken in the 2.0 timeframe.
* sg/diff-multiple-identical-renames:
diffcore: fix iteration order of identical files during rename detection
Build updates for MSVC.
* ss/msvc:
MSVC: use shipped headers instead of fallback definitions
MSVC: vsnprintf in Visual Studio 2015 doesn't need SNPRINTF_SIZE_CORR any more
l10n-2.8.0-rnd3-fr
* tag 'l10n-2.8.0-rnd3-fr' of git://github.com/git-l10n/git-po:
l10n: fr: don't translate "merge" as a parameter
l10n: fr: change "id de clé" to match "id-clé"
l10n: fr: fix wrongly translated option name
l10n: fr: fix transcation of "dir"
* 'fr_v2.8.0_r3' of git://github.com/jnavila/git:
l10n: fr: don't translate "merge" as a parameter
l10n: fr: change "id de clé" to match "id-clé"
l10n: fr: fix wrongly translated option name
l10n: fr: fix transcation of "dir"
"git merge FETCH_HEAD" dereferenced NULL pointer when merging
nothing into an unborn history (which is arguably unusual usage,
which perhaps was the reason why nobody noticed it).
* jv/merge-nothing-into-void:
merge: fix NULL pointer dereference when merging nothing into void
When "git merge --squash" stopped due to conflict, the concluding
"git commit" failed to read in the SQUASH_MSG that shows the log
messages from all the squashed commits.
* ss/commit-squash-msg:
commit: do not lose SQUASH_MSG contents
"git send-email" had trouble parsing alias file in mailrc format
when lines in it had trailing whitespaces on them.
* jk/send-email-rtrim-mailrc-alias:
send-email: ignore trailing whitespace in mailrc alias file
"git mergetool" did not work well with conflicts that both sides
deleted.
* da/mergetool-delete-delete-conflict:
mergetool: honor tempfile configuration when resolving delete conflicts
mergetool: support delete/delete conflicts
The startup_info data, which records if we are working inside a
repository (among other things), are now uniformly available to Git
subcommand implementations, and Git avoids attempting to touch
references when we are not in a repository.
* jk/startup-info:
use setup_git_directory() in test-* programs
grep: turn off gitlink detection for --no-index
mailmap: do not resolve blobs in a non-repository
remote: don't resolve HEAD in non-repository
setup: set startup_info->have_repository more reliably
setup: make startup_info available everywhere
strbuf_getwholeline() did not NUL-terminate the buffer on certain
corner cases in its error codepath.
* jk/getwholeline-getdelim-empty:
strbuf_getwholeline: NUL-terminate getdelim buffer on error
A small memory leak in an error codepath has been plugged in xdiff
code.
* rj/xdiff-prepare-plug-leak-on-error-codepath:
xdiff/xprepare: fix a memory leak
xdiff/xprepare: use the XDF_DIFF_ALG() macro to access flag bits
Fetching of history by naming a commit object name directly didn't
work across remote-curl transport.
* gf/fetch-pack-direct-object-fetch:
fetch-pack: update the documentation for "<refs>..." arguments
fetch-pack: fix object_id of exact sha1
The "--local-env-vars" and "--resolve-git-dir" options of "git
rev-parse" failed to work outside a repository when the command's
option parsing was rewritten in 1.8.5 era.
* jk/rev-parse-local-env-vars:
rev-parse: let some options run outside repository
t1515: add tests for rev-parse out-of-repo helpers
"git config --get-urlmatch", unlike other variants of the "git
config --get" family, did not signal error with its exit status
when there was no matching configuration.
* jk/config-get-urlmatch:
Documentation/git-config: fix --get-all description
Documentation/git-config: use bulleted list for exit codes
config: fail if --get-urlmatch finds no value
The tests that involve running httpd leaked the system-wide
configuration in /etc/gitconfig to the tested environment.
* jk/test-httpd-config-nosystem:
t/lib-httpd: pass through GIT_CONFIG_NOSYSTEM env
The embedded args argv-array in the child process is used to build
the command line to run pack-objects instead of using a separate
array of strings.
* mp/upload-pack-use-embedded-args:
upload-pack: use argv_array for pack_objects
git commit --amend preserves the author details unless --reset-author is
given.
git-gui discards the author details on amend.
Fix by reading the author details along with the commit message, and
setting the appropriate environment variables required for preserving
them.
Reported long ago in the mailing list[1].
[1] http://article.gmane.org/gmane.comp.version-control.git/243921
Signed-off-by: Orgad Shaneh <orgad.shaneh@audiocodes.com>
