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win32: add a helper to run
git.exe without a foreground window
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>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -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; | ||
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| dir_len -= suffix_len; | ||
| if (memcmp(dir + dir_len, suffix, suffix_len * sizeof(wchar_t))) | ||
| return 0; | ||
|
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| len = GetEnvironmentVariableW(L"PATH", NULL, 0); | ||
| if (!len) | ||
| return 0; | ||
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| 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; | ||
| } | ||
|
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||
| 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; | ||
|
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| 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; | ||
|
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| /* 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; | ||
|
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| if (slash >= size - 11) | ||
| return 127; /* Too long path */ | ||
|
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| /* If it is in Git's exec path, add the bin/ directory to the PATH */ | ||
| extend_path(_wpgmptr, slash); | ||
|
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| /* 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 */ | ||
|
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||
| 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; | ||
| } | ||
|
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| startup_info.hStdInput = GetStdHandle(STD_INPUT_HANDLE); | ||
| startup_info.hStdOutput = GetStdHandle(STD_OUTPUT_HANDLE); | ||
| startup_info.hStdError = GetStdHandle(STD_ERROR_HANDLE); | ||
|
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| 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? */ | ||
|
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| CloseHandle(process_info.hProcess); | ||
| CloseHandle(process_info.hThread); | ||
|
|
||
| return (int)exit_code; | ||
| } |
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