From: Johannes Schindelin <johannes.schindelin@gmx.de>
On Windows, there are two kinds of executables, console ones and non-console ones. Git's executables are all console ones.
When launching the former e.g. in a scheduled task, a CMD window pops up. This is not what we want for the tasks installed via the `git maintenance` command.
To work around this, let's introduce `headless-git.exe`, which is a non-console program that does _not_ pop up any window. All it does is to re-launch `git.exe`, suppressing that console window, passing through all command-line arguments as-are.
Helped-by: Carlo Marcelo Arenas Belón <carenas@gmail.com>
Helped-by: Yuyi Wang <Strawberry_Str@hotmail.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
---
Makefile | 9 ++
compat/win32/headless.c | 115 +++++++++++++++++++++
config.mak.uname | 3 +
contrib/buildsystems/CMakeLists.txt | 9 ++
contrib/buildsystems/Generators/Vcxproj.pm | 4 +-
contrib/buildsystems/engine.pl | 1 +
6 files changed, 139 insertions(+), 2 deletions(-)
create mode 100644 compat/win32/headless.c
Show changes to 6 files +139 −2
Makefile, compat/win32/headless.c, config.mak.uname, contrib/buildsystems/CMakeLists.txt, contrib/buildsystems/Generators/Vcxproj.pm, contrib/buildsystems/engine.pl
diff --git a/Makefile b/Makefile
index fb541dedc9f..15b327b72b9 100644
--- a/Makefile
+++ b/Makefile
@@ -2779,6 +2779,13 @@ compat/nedmalloc/nedmalloc.sp compat/nedmalloc/nedmalloc.o: EXTRA_CPPFLAGS = \
compat/nedmalloc/nedmalloc.sp: SP_EXTRA_FLAGS += -Wno-non-pointer-null
endif
+headless-git.o: compat/win32/headless.c GIT-CFLAGS
+ $(QUIET_CC)$(CC) $(ALL_CFLAGS) $(COMPAT_CFLAGS) \
+ -fno-stack-protector -o $@ -c -Wall -Wwrite-strings $<
+
+headless-git$X: headless-git.o git.res GIT-LDFLAGS
+ $(QUIET_LINK)$(CC) $(ALL_CFLAGS) $(ALL_LDFLAGS) -mwindows -o $@ $< git.res
+
git-%$X: %.o GIT-LDFLAGS $(GITLIBS)
$(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) $(LIBS)
@@ -3652,6 +3659,7 @@ clean: profile-clean coverage-clean cocciclean
$(RM) po/git.pot po/git-core.pot
$(RM) git.res
$(RM) $(OBJECTS)
+ $(RM) headless-git.o
$(RM) $(LIB_FILE) $(XDIFF_LIB) $(REFTABLE_LIB) $(REFTABLE_TEST_LIB)
$(RM) $(ALL_PROGRAMS) $(SCRIPT_LIB) $(BUILT_INS) $(OTHER_PROGRAMS)
$(RM) $(TEST_PROGRAMS)
@@ -3680,6 +3688,7 @@ endif
$(RM) GIT-SCRIPT-DEFINES GIT-PERL-DEFINES GIT-PERL-HEADER GIT-PYTHON-VARS
ifdef MSVC
$(RM) $(patsubst %.o,%.o.pdb,$(OBJECTS))
+ $(RM) headless-git.o.pdb
$(RM) $(patsubst %.exe,%.pdb,$(OTHER_PROGRAMS))
$(RM) $(patsubst %.exe,%.iobj,$(OTHER_PROGRAMS))
$(RM) $(patsubst %.exe,%.ipdb,$(OTHER_PROGRAMS))
diff --git a/compat/win32/headless.c b/compat/win32/headless.c
new file mode 100644
index 00000000000..8b00dfe3bd5
--- /dev/null
+++ b/compat/win32/headless.c
@@ -0,0 +1,115 @@
+/*
+ * headless Git - run Git without opening a console window on Windows
+ */
+
+#define STRICT
+#define WIN32_LEAN_AND_MEAN
+#define UNICODE
+#define _UNICODE
+#include <windows.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <wchar.h>
+
+/*
+ * If `dir` contains the path to a Git exec directory, extend `PATH` to
+ * include the corresponding `bin/` directory (which is where all those
+ * `.dll` files needed by `git.exe` are, on Windows).
+ */
+static int extend_path(wchar_t *dir, size_t dir_len)
+{
+ const wchar_t *suffix = L"\\libexec\\git-core";
+ size_t suffix_len = wcslen(suffix);
+ wchar_t *env;
+ DWORD len;
+
+ if (dir_len < suffix_len)
+ return 0;
+
+ dir_len -= suffix_len;
+ if (memcmp(dir + dir_len, suffix, suffix_len * sizeof(wchar_t)))
+ return 0;
+
+ len = GetEnvironmentVariableW(L"PATH", NULL, 0);
+ if (!len)
+ return 0;
+
+ env = _alloca((dir_len + 5 + len) * sizeof(wchar_t));
+ wcsncpy(env, dir, dir_len);
+ wcscpy(env + dir_len, L"\\bin;");
+ if (!GetEnvironmentVariableW(L"PATH", env + dir_len + 5, len))
+ return 0;
+
+ SetEnvironmentVariableW(L"PATH", env);
+ return 1;
+}
+
+int WINAPI wWinMain(_In_ HINSTANCE instance,
+ _In_opt_ HINSTANCE previous_instance,
+ _In_ LPWSTR command_line, _In_ int show)
+{
+ wchar_t git_command_line[32768];
+ size_t size = sizeof(git_command_line) / sizeof(wchar_t);
+ const wchar_t *needs_quotes = L"";
+ int slash = 0, i;
+
+ STARTUPINFO startup_info = {
+ .cb = sizeof(STARTUPINFO),
+ .dwFlags = STARTF_USESHOWWINDOW,
+ .wShowWindow = SW_HIDE,
+ };
+ PROCESS_INFORMATION process_info = { 0 };
+ DWORD creation_flags = CREATE_UNICODE_ENVIRONMENT |
+ CREATE_NEW_CONSOLE | CREATE_NO_WINDOW;
+ DWORD exit_code;
+
+ /* First, determine the full path of argv[0] */
+ for (i = 0; _wpgmptr[i]; i++)
+ if (_wpgmptr[i] == L' ')
+ needs_quotes = L"\"";
+ else if (_wpgmptr[i] == L'\\')
+ slash = i;
+
+ if (slash >= size - 11)
+ return 127; /* Too long path */
+
+ /* If it is in Git's exec path, add the bin/ directory to the PATH */
+ extend_path(_wpgmptr, slash);
+
+ /* Then, add the full path of `git.exe` as argv[0] */
+ i = swprintf_s(git_command_line, size, L"%ls%.*ls\\git.exe%ls",
+ needs_quotes, slash, _wpgmptr, needs_quotes);
+ if (i < 0)
+ return 127; /* Too long path */
+
+ if (*command_line) {
+ /* Now, append the command-line arguments */
+ i = swprintf_s(git_command_line + i, size - i,
+ L" %ls", command_line);
+ if (i < 0)
+ return 127;
+ }
+
+ startup_info.hStdInput = GetStdHandle(STD_INPUT_HANDLE);
+ startup_info.hStdOutput = GetStdHandle(STD_OUTPUT_HANDLE);
+ startup_info.hStdError = GetStdHandle(STD_ERROR_HANDLE);
+
+ if (!CreateProcess(NULL, /* infer argv[0] from the command line */
+ git_command_line, /* modified command line */
+ NULL, /* inherit process handles? */
+ NULL, /* inherit thread handles? */
+ FALSE, /* handles inheritable? */
+ creation_flags,
+ NULL, /* use this process' environment */
+ NULL, /* use this process' working directory */
+ &startup_info, &process_info))
+ return 129; /* could not start */
+ WaitForSingleObject(process_info.hProcess, INFINITE);
+ if (!GetExitCodeProcess(process_info.hProcess, &exit_code))
+ exit_code = 130; /* Could not determine exit code? */
+
+ CloseHandle(process_info.hProcess);
+ CloseHandle(process_info.hThread);
+
+ return (int)exit_code;
+}
diff --git a/config.mak.uname b/config.mak.uname
index 64c44db8058..3bb03f423a0 100644
--- a/config.mak.uname
+++ b/config.mak.uname
@@ -526,6 +526,8 @@ else
endif
X = .exe
+ EXTRA_PROGRAMS += headless-git$X
+
compat/msvc.o: compat/msvc.c compat/mingw.c GIT-CFLAGS
endif
ifeq ($(uname_S),Interix)
@@ -705,6 +707,7 @@ ifeq ($(uname_S),MINGW)
COMPAT_CFLAGS += -D__USE_MINGW_ANSI_STDIO=0 -DDETECT_MSYS_TTY \
-fstack-protector-strong
EXTLIBS += -lntdll
+ EXTRA_PROGRAMS += headless-git$X
INSTALL = /bin/install
INTERNAL_QSORT = YesPlease
HAVE_LIBCHARSET_H = YesPlease
diff --git a/contrib/buildsystems/CMakeLists.txt b/contrib/buildsystems/CMakeLists.txt
index 4faa419cc3d..6b819e2fbdf 100644
--- a/contrib/buildsystems/CMakeLists.txt
+++ b/contrib/buildsystems/CMakeLists.txt
@@ -738,6 +738,15 @@ if(WIN32)
else()
message(FATAL_ERROR "Unhandled compiler: ${CMAKE_C_COMPILER_ID}")
endif()
+
+ add_executable(headless-git ${CMAKE_SOURCE_DIR}/compat/win32/headless.c)
+ if(CMAKE_C_COMPILER_ID STREQUAL "GNU" OR CMAKE_C_COMPILER_ID STREQUAL "Clang")
+ target_link_options(headless-git PUBLIC -municode -Wl,-subsystem,windows)
+ elseif(CMAKE_C_COMPILER_ID STREQUAL "MSVC")
+ target_link_options(headless-git PUBLIC /NOLOGO /ENTRY:wWinMainCRTStartup /SUBSYSTEM:WINDOWS)
+ else()
+ message(FATAL_ERROR "Unhandled compiler: ${CMAKE_C_COMPILER_ID}")
+ endif()
elseif(UNIX)
target_link_libraries(common-main pthread rt)
endif()
diff --git a/contrib/buildsystems/Generators/Vcxproj.pm b/contrib/buildsystems/Generators/Vcxproj.pm
index 1a25789d285..b2e68a16715 100644
--- a/contrib/buildsystems/Generators/Vcxproj.pm
+++ b/contrib/buildsystems/Generators/Vcxproj.pm
@@ -76,7 +76,7 @@ sub createProject {
my $libs_release = "\n ";
my $libs_debug = "\n ";
- if (!$static_library) {
+ if (!$static_library && $name ne 'headless-git') {
$libs_release = join(";", sort(grep /^(?!libgit\.lib|xdiff\/lib\.lib|vcs-svn\/lib\.lib|reftable\/libreftable\.lib)/, @{$$build_structure{"$prefix${name}_LIBS"}}));
$libs_debug = $libs_release;
$libs_debug =~ s/zlib\.lib/zlibd\.lib/g;
@@ -230,7 +230,7 @@ EOM
print F << "EOM";
</ItemGroup>
EOM
- if (!$static_library || $target =~ 'vcs-svn' || $target =~ 'xdiff') {
+ if ((!$static_library || $target =~ 'vcs-svn' || $target =~ 'xdiff') && !($name =~ /headless-git/)) {
my $uuid_libgit = $$build_structure{"LIBS_libgit_GUID"};
my $uuid_libreftable = $$build_structure{"LIBS_reftable/libreftable_GUID"};
my $uuid_xdiff_lib = $$build_structure{"LIBS_xdiff/lib_GUID"};
diff --git a/contrib/buildsystems/engine.pl b/contrib/buildsystems/engine.pl
index ed6c45988a3..069be7e4bef 100755
--- a/contrib/buildsystems/engine.pl
+++ b/contrib/buildsystems/engine.pl
@@ -371,6 +371,7 @@ sub handleLinkLine
# exit(1);
foreach (@objfiles) {
my $sourcefile = $_;
+ $sourcefile =~ s/^headless-git\.o$/compat\/win32\/headless.c/;
$sourcefile =~ s/\.o$/.c/;
push(@sources, $sourcefile);
push(@cflags, @{$compile_options{"${sourcefile}_CFLAGS"}});
Derrick Stolee via GitGitGadget