#include "../git-compat-util.h" #include "win32.h" #include #include #include "../strbuf.h" #include "../run-command.h" #include "../cache.h" #include "win32/lazyload.h" #include "../config.h" #include "dir.h" #define HCAST(type, handle) ((type)(intptr_t)handle) static const int delay[] = { 0, 1, 10, 20, 40 }; int err_win_to_posix(DWORD winerr) { int error = ENOSYS; switch(winerr) { case ERROR_ACCESS_DENIED: error = EACCES; break; case ERROR_ACCOUNT_DISABLED: error = EACCES; break; case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break; case ERROR_ALREADY_ASSIGNED: error = EBUSY; break; case ERROR_ALREADY_EXISTS: error = EEXIST; break; case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break; case ERROR_BAD_COMMAND: error = EIO; break; case ERROR_BAD_DEVICE: error = ENODEV; break; case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break; case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break; case ERROR_BAD_FORMAT: error = ENOEXEC; break; case ERROR_BAD_LENGTH: error = EINVAL; break; case ERROR_BAD_PATHNAME: error = ENOENT; break; case ERROR_BAD_PIPE: error = EPIPE; break; case ERROR_BAD_UNIT: error = ENODEV; break; case ERROR_BAD_USERNAME: error = EINVAL; break; case ERROR_BROKEN_PIPE: error = EPIPE; break; case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break; case ERROR_BUSY: error = EBUSY; break; case ERROR_BUSY_DRIVE: error = EBUSY; break; case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break; case ERROR_CANNOT_MAKE: error = EACCES; break; case ERROR_CANTOPEN: error = EIO; break; case ERROR_CANTREAD: error = EIO; break; case ERROR_CANTWRITE: error = EIO; break; case ERROR_CRC: error = EIO; break; case ERROR_CURRENT_DIRECTORY: error = EACCES; break; case ERROR_DEVICE_IN_USE: error = EBUSY; break; case ERROR_DEV_NOT_EXIST: error = ENODEV; break; case ERROR_DIRECTORY: error = EINVAL; break; case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break; case ERROR_DISK_CHANGE: error = EIO; break; case ERROR_DISK_FULL: error = ENOSPC; break; case ERROR_DRIVE_LOCKED: error = EBUSY; break; case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break; case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break; case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break; case ERROR_FILE_EXISTS: error = EEXIST; break; case ERROR_FILE_INVALID: error = ENODEV; break; case ERROR_FILE_NOT_FOUND: error = ENOENT; break; case ERROR_GEN_FAILURE: error = EIO; break; case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break; case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break; case ERROR_INVALID_ACCESS: error = EACCES; break; case ERROR_INVALID_ADDRESS: error = EFAULT; break; case ERROR_INVALID_BLOCK: error = EFAULT; break; case ERROR_INVALID_DATA: error = EINVAL; break; case ERROR_INVALID_DRIVE: error = ENODEV; break; case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break; case ERROR_INVALID_FLAGS: error = EINVAL; break; case ERROR_INVALID_FUNCTION: error = ENOSYS; break; case ERROR_INVALID_HANDLE: error = EBADF; break; case ERROR_INVALID_LOGON_HOURS: error = EACCES; break; case ERROR_INVALID_NAME: error = EINVAL; break; case ERROR_INVALID_OWNER: error = EINVAL; break; case ERROR_INVALID_PARAMETER: error = EINVAL; break; case ERROR_INVALID_PASSWORD: error = EPERM; break; case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break; case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break; case ERROR_INVALID_TARGET_HANDLE: error = EIO; break; case ERROR_INVALID_WORKSTATION: error = EACCES; break; case ERROR_IO_DEVICE: error = EIO; break; case ERROR_IO_INCOMPLETE: error = EINTR; break; case ERROR_LOCKED: error = EBUSY; break; case ERROR_LOCK_VIOLATION: error = EACCES; break; case ERROR_LOGON_FAILURE: error = EACCES; break; case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break; case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break; case ERROR_MORE_DATA: error = EPIPE; break; case ERROR_NEGATIVE_SEEK: error = ESPIPE; break; case ERROR_NOACCESS: error = EFAULT; break; case ERROR_NONE_MAPPED: error = EINVAL; break; case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break; case ERROR_NOT_READY: error = EAGAIN; break; case ERROR_NOT_SAME_DEVICE: error = EXDEV; break; case ERROR_NO_DATA: error = EPIPE; break; case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break; case ERROR_NO_PROC_SLOTS: error = EAGAIN; break; case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break; case ERROR_OPEN_FAILED: error = EIO; break; case ERROR_OPEN_FILES: error = EBUSY; break; case ERROR_OPERATION_ABORTED: error = EINTR; break; case ERROR_OUTOFMEMORY: error = ENOMEM; break; case ERROR_PASSWORD_EXPIRED: error = EACCES; break; case ERROR_PATH_BUSY: error = EBUSY; break; case ERROR_PATH_NOT_FOUND: error = ENOENT; break; case ERROR_PIPE_BUSY: error = EBUSY; break; case ERROR_PIPE_CONNECTED: error = EPIPE; break; case ERROR_PIPE_LISTENING: error = EPIPE; break; case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break; case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break; case ERROR_READ_FAULT: error = EIO; break; case ERROR_SEEK: error = EIO; break; case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break; case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break; case ERROR_SHARING_VIOLATION: error = EACCES; break; case ERROR_STACK_OVERFLOW: error = ENOMEM; break; case ERROR_SWAPERROR: error = ENOENT; break; case ERROR_TOO_MANY_MODULES: error = EMFILE; break; case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break; case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break; case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break; case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break; case ERROR_WRITE_FAULT: error = EIO; break; case ERROR_WRITE_PROTECT: error = EROFS; break; } return error; } static inline int is_file_in_use_error(DWORD errcode) { switch (errcode) { case ERROR_SHARING_VIOLATION: case ERROR_ACCESS_DENIED: return 1; } return 0; } static int read_yes_no_answer(void) { char answer[1024]; if (fgets(answer, sizeof(answer), stdin)) { size_t answer_len = strlen(answer); int got_full_line = 0, c; /* remove the newline */ if (answer_len >= 2 && answer[answer_len-2] == '\r') { answer[answer_len-2] = '\0'; got_full_line = 1; } else if (answer_len >= 1 && answer[answer_len-1] == '\n') { answer[answer_len-1] = '\0'; got_full_line = 1; } /* flush the buffer in case we did not get the full line */ if (!got_full_line) while ((c = getchar()) != EOF && c != '\n') ; } else /* we could not read, return the * default answer which is no */ return 0; if (tolower(answer[0]) == 'y' && !answer[1]) return 1; if (!strncasecmp(answer, "yes", sizeof(answer))) return 1; if (tolower(answer[0]) == 'n' && !answer[1]) return 0; if (!strncasecmp(answer, "no", sizeof(answer))) return 0; /* did not find an answer we understand */ return -1; } static int ask_yes_no_if_possible(const char *format, ...) { char question[4096]; const char *retry_hook[] = { NULL, NULL, NULL }; va_list args; va_start(args, format); vsnprintf(question, sizeof(question), format, args); va_end(args); if ((retry_hook[0] = mingw_getenv("GIT_ASK_YESNO"))) { retry_hook[1] = question; return !run_command_v_opt(retry_hook, 0); } if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr))) return 0; while (1) { int answer; fprintf(stderr, "%s (y/n) ", question); if ((answer = read_yes_no_answer()) >= 0) return answer; fprintf(stderr, "Sorry, I did not understand your answer. " "Please type 'y' or 'n'\n"); } } /* Windows only */ enum hide_dotfiles_type { HIDE_DOTFILES_FALSE = 0, HIDE_DOTFILES_TRUE, HIDE_DOTFILES_DOTGITONLY }; static enum hide_dotfiles_type hide_dotfiles = HIDE_DOTFILES_DOTGITONLY; static char *unset_environment_variables; int mingw_core_config(const char *var, const char *value, void *cb) { if (!strcmp(var, "core.hidedotfiles")) { if (value && !strcasecmp(value, "dotgitonly")) hide_dotfiles = HIDE_DOTFILES_DOTGITONLY; else hide_dotfiles = git_config_bool(var, value); return 0; } if (!strcmp(var, "core.unsetenvvars")) { free(unset_environment_variables); unset_environment_variables = xstrdup(value); return 0; } return 0; } /* Normalizes NT paths as returned by some low-level APIs. */ static wchar_t *normalize_ntpath(wchar_t *wbuf) { int i; /* fix absolute path prefixes */ if (wbuf[0] == '\\') { /* strip NT namespace prefixes */ if (!wcsncmp(wbuf, L"\\??\\", 4) || !wcsncmp(wbuf, L"\\\\?\\", 4)) wbuf += 4; else if (!wcsnicmp(wbuf, L"\\DosDevices\\", 12)) wbuf += 12; /* replace remaining '...UNC\' with '\\' */ if (!wcsnicmp(wbuf, L"UNC\\", 4)) { wbuf += 2; *wbuf = '\\'; } } /* convert backslashes to slashes */ for (i = 0; wbuf[i]; i++) if (wbuf[i] == '\\') wbuf[i] = '/'; return wbuf; } int mingw_unlink(const char *pathname) { int ret, tries = 0; wchar_t wpathname[MAX_PATH]; if (xutftowcs_path(wpathname, pathname) < 0) return -1; /* read-only files cannot be removed */ _wchmod(wpathname, 0666); while ((ret = _wunlink(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) { if (!is_file_in_use_error(GetLastError())) break; /* * We assume that some other process had the source or * destination file open at the wrong moment and retry. * In order to give the other process a higher chance to * complete its operation, we give up our time slice now. * If we have to retry again, we do sleep a bit. */ Sleep(delay[tries]); tries++; } while (ret == -1 && is_file_in_use_error(GetLastError()) && ask_yes_no_if_possible("Unlink of file '%s' failed. " "Should I try again?", pathname)) ret = _wunlink(wpathname); return ret; } static int is_dir_empty(const wchar_t *wpath) { WIN32_FIND_DATAW findbuf; HANDLE handle; wchar_t wbuf[MAX_PATH + 2]; wcscpy(wbuf, wpath); wcscat(wbuf, L"\\*"); handle = FindFirstFileW(wbuf, &findbuf); if (handle == INVALID_HANDLE_VALUE) return GetLastError() == ERROR_NO_MORE_FILES; while (!wcscmp(findbuf.cFileName, L".") || !wcscmp(findbuf.cFileName, L"..")) if (!FindNextFileW(handle, &findbuf)) { DWORD err = GetLastError(); FindClose(handle); return err == ERROR_NO_MORE_FILES; } FindClose(handle); return 0; } int mingw_rmdir(const char *pathname) { int ret, tries = 0; wchar_t wpathname[MAX_PATH]; if (xutftowcs_path(wpathname, pathname) < 0) return -1; while ((ret = _wrmdir(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) { if (!is_file_in_use_error(GetLastError())) errno = err_win_to_posix(GetLastError()); if (errno != EACCES) break; if (!is_dir_empty(wpathname)) { errno = ENOTEMPTY; break; } /* * We assume that some other process had the source or * destination file open at the wrong moment and retry. * In order to give the other process a higher chance to * complete its operation, we give up our time slice now. * If we have to retry again, we do sleep a bit. */ Sleep(delay[tries]); tries++; } while (ret == -1 && errno == EACCES && is_file_in_use_error(GetLastError()) && ask_yes_no_if_possible("Deletion of directory '%s' failed. " "Should I try again?", pathname)) ret = _wrmdir(wpathname); return ret; } static inline int needs_hiding(const char *path) { const char *basename; if (hide_dotfiles == HIDE_DOTFILES_FALSE) return 0; /* We cannot use basename(), as it would remove trailing slashes */ win32_skip_dos_drive_prefix((char **)&path); if (!*path) return 0; for (basename = path; *path; path++) if (is_dir_sep(*path)) { do { path++; } while (is_dir_sep(*path)); /* ignore trailing slashes */ if (*path) basename = path; } if (hide_dotfiles == HIDE_DOTFILES_TRUE) return *basename == '.'; assert(hide_dotfiles == HIDE_DOTFILES_DOTGITONLY); return !strncasecmp(".git", basename, 4) && (!basename[4] || is_dir_sep(basename[4])); } static int set_hidden_flag(const wchar_t *path, int set) { DWORD original = GetFileAttributesW(path), modified; if (set) modified = original | FILE_ATTRIBUTE_HIDDEN; else modified = original & ~FILE_ATTRIBUTE_HIDDEN; if (original == modified || SetFileAttributesW(path, modified)) return 0; errno = err_win_to_posix(GetLastError()); return -1; } int mingw_mkdir(const char *path, int mode) { int ret; wchar_t wpath[MAX_PATH]; if (xutftowcs_path(wpath, path) < 0) return -1; ret = _wmkdir(wpath); if (!ret && needs_hiding(path)) return set_hidden_flag(wpath, 1); return ret; } /* * Calling CreateFile() using FILE_APPEND_DATA and without FILE_WRITE_DATA * is documented in [1] as opening a writable file handle in append mode. * (It is believed that) this is atomic since it is maintained by the * kernel unlike the O_APPEND flag which is racily maintained by the CRT. * * [1] https://docs.microsoft.com/en-us/windows/desktop/fileio/file-access-rights-constants * * This trick does not appear to work for named pipes. Instead it creates * a named pipe client handle that cannot be written to. Callers should * just use the regular _wopen() for them. (And since client handle gets * bound to a unique server handle, it isn't really an issue.) */ static int mingw_open_append(wchar_t const *wfilename, int oflags, ...) { HANDLE handle; int fd; DWORD create = (oflags & O_CREAT) ? OPEN_ALWAYS : OPEN_EXISTING; /* only these flags are supported */ if ((oflags & ~O_CREAT) != (O_WRONLY | O_APPEND)) return errno = ENOSYS, -1; /* * FILE_SHARE_WRITE is required to permit child processes * to append to the file. */ handle = CreateFileW(wfilename, FILE_APPEND_DATA, FILE_SHARE_WRITE | FILE_SHARE_READ, NULL, create, FILE_ATTRIBUTE_NORMAL, NULL); if (handle == INVALID_HANDLE_VALUE) return errno = err_win_to_posix(GetLastError()), -1; /* * No O_APPEND here, because the CRT uses it only to reset the * file pointer to EOF before each write(); but that is not * necessary (and may lead to races) for a file created with * FILE_APPEND_DATA. */ fd = _open_osfhandle((intptr_t)handle, O_BINARY); if (fd < 0) CloseHandle(handle); return fd; } /* * Does the pathname map to the local named pipe filesystem? * That is, does it have a "//./pipe/" prefix? */ static int is_local_named_pipe_path(const char *filename) { return (is_dir_sep(filename[0]) && is_dir_sep(filename[1]) && filename[2] == '.' && is_dir_sep(filename[3]) && !strncasecmp(filename+4, "pipe", 4) && is_dir_sep(filename[8]) && filename[9]); } int mingw_open (const char *filename, int oflags, ...) { typedef int (*open_fn_t)(wchar_t const *wfilename, int oflags, ...); va_list args; unsigned mode; int fd; wchar_t wfilename[MAX_PATH]; open_fn_t open_fn; va_start(args, oflags); mode = va_arg(args, int); va_end(args); if (filename && !strcmp(filename, "/dev/null")) filename = "nul"; if ((oflags & O_APPEND) && !is_local_named_pipe_path(filename)) open_fn = mingw_open_append; else open_fn = _wopen; if (xutftowcs_path(wfilename, filename) < 0) return -1; fd = open_fn(wfilename, oflags, mode); if (fd < 0 && (oflags & O_ACCMODE) != O_RDONLY && errno == EACCES) { DWORD attrs = GetFileAttributesW(wfilename); if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY)) errno = EISDIR; } if ((oflags & O_CREAT) && needs_hiding(filename)) { /* * Internally, _wopen() uses the CreateFile() API which errors * out with an ERROR_ACCESS_DENIED if CREATE_ALWAYS was * specified and an already existing file's attributes do not * match *exactly*. As there is no mode or flag we can set that * would correspond to FILE_ATTRIBUTE_HIDDEN, let's just try * again *without* the O_CREAT flag (that corresponds to the * CREATE_ALWAYS flag of CreateFile()). */ if (fd < 0 && errno == EACCES) fd = open_fn(wfilename, oflags & ~O_CREAT, mode); if (fd >= 0 && set_hidden_flag(wfilename, 1)) warning("could not mark '%s' as hidden.", filename); } return fd; } static BOOL WINAPI ctrl_ignore(DWORD type) { return TRUE; } #undef fgetc int mingw_fgetc(FILE *stream) { int ch; if (!isatty(_fileno(stream))) return fgetc(stream); SetConsoleCtrlHandler(ctrl_ignore, TRUE); while (1) { ch = fgetc(stream); if (ch != EOF || GetLastError() != ERROR_OPERATION_ABORTED) break; /* Ctrl+C was pressed, simulate SIGINT and retry */ mingw_raise(SIGINT); } SetConsoleCtrlHandler(ctrl_ignore, FALSE); return ch; } #undef fopen FILE *mingw_fopen (const char *filename, const char *otype) { int hide = needs_hiding(filename); FILE *file; wchar_t wfilename[MAX_PATH], wotype[4]; if (filename && !strcmp(filename, "/dev/null")) filename = "nul"; if (xutftowcs_path(wfilename, filename) < 0 || xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0) return NULL; if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) { error("could not unhide %s", filename); return NULL; } file = _wfopen(wfilename, wotype); if (!file && GetLastError() == ERROR_INVALID_NAME) errno = ENOENT; if (file && hide && set_hidden_flag(wfilename, 1)) warning("could not mark '%s' as hidden.", filename); return file; } FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream) { int hide = needs_hiding(filename); FILE *file; wchar_t wfilename[MAX_PATH], wotype[4]; if (filename && !strcmp(filename, "/dev/null")) filename = "nul"; if (xutftowcs_path(wfilename, filename) < 0 || xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0) return NULL; if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) { error("could not unhide %s", filename); return NULL; } file = _wfreopen(wfilename, wotype, stream); if (file && hide && set_hidden_flag(wfilename, 1)) warning("could not mark '%s' as hidden.", filename); return file; } #undef fflush int mingw_fflush(FILE *stream) { int ret = fflush(stream); /* * write() is used behind the scenes of stdio output functions. * Since git code does not check for errors after each stdio write * operation, it can happen that write() is called by a later * stdio function even if an earlier write() call failed. In the * case of a pipe whose readable end was closed, only the first * call to write() reports EPIPE on Windows. Subsequent write() * calls report EINVAL. It is impossible to notice whether this * fflush invocation triggered such a case, therefore, we have to * catch all EINVAL errors whole-sale. */ if (ret && errno == EINVAL) errno = EPIPE; return ret; } #undef write ssize_t mingw_write(int fd, const void *buf, size_t len) { ssize_t result = write(fd, buf, len); if (result < 0 && errno == EINVAL && buf) { /* check if fd is a pipe */ HANDLE h = (HANDLE) _get_osfhandle(fd); if (GetFileType(h) == FILE_TYPE_PIPE) errno = EPIPE; else errno = EINVAL; } return result; } int mingw_access(const char *filename, int mode) { wchar_t wfilename[MAX_PATH]; if (xutftowcs_path(wfilename, filename) < 0) return -1; /* X_OK is not supported by the MSVCRT version */ return _waccess(wfilename, mode & ~X_OK); } int mingw_chdir(const char *dirname) { wchar_t wdirname[MAX_PATH]; if (xutftowcs_path(wdirname, dirname) < 0) return -1; return _wchdir(wdirname); } int mingw_chmod(const char *filename, int mode) { wchar_t wfilename[MAX_PATH]; if (xutftowcs_path(wfilename, filename) < 0) return -1; return _wchmod(wfilename, mode); } /* * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC. * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch. */ static inline long long filetime_to_hnsec(const FILETIME *ft) { long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime; /* Windows to Unix Epoch conversion */ return winTime - 116444736000000000LL; } static inline void filetime_to_timespec(const FILETIME *ft, struct timespec *ts) { long long hnsec = filetime_to_hnsec(ft); ts->tv_sec = (time_t)(hnsec / 10000000); ts->tv_nsec = (hnsec % 10000000) * 100; } /** * Verifies that safe_create_leading_directories() would succeed. */ static int has_valid_directory_prefix(wchar_t *wfilename) { int n = wcslen(wfilename); while (n > 0) { wchar_t c = wfilename[--n]; DWORD attributes; if (!is_dir_sep(c)) continue; wfilename[n] = L'\0'; attributes = GetFileAttributesW(wfilename); wfilename[n] = c; if (attributes == FILE_ATTRIBUTE_DIRECTORY || attributes == FILE_ATTRIBUTE_DEVICE) return 1; if (attributes == INVALID_FILE_ATTRIBUTES) switch (GetLastError()) { case ERROR_PATH_NOT_FOUND: continue; case ERROR_FILE_NOT_FOUND: /* This implies parent directory exists. */ return 1; } return 0; } return 1; } /* We keep the do_lstat code in a separate function to avoid recursion. * When a path ends with a slash, the stat will fail with ENOENT. In * this case, we strip the trailing slashes and stat again. * * If follow is true then act like stat() and report on the link * target. Otherwise report on the link itself. */ static int do_lstat(int follow, const char *file_name, struct stat *buf) { WIN32_FILE_ATTRIBUTE_DATA fdata; wchar_t wfilename[MAX_PATH]; if (xutftowcs_path(wfilename, file_name) < 0) return -1; if (GetFileAttributesExW(wfilename, GetFileExInfoStandard, &fdata)) { buf->st_ino = 0; buf->st_gid = 0; buf->st_uid = 0; buf->st_nlink = 1; buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes); buf->st_size = fdata.nFileSizeLow | (((off_t)fdata.nFileSizeHigh)<<32); buf->st_dev = buf->st_rdev = 0; /* not used by Git */ filetime_to_timespec(&(fdata.ftLastAccessTime), &(buf->st_atim)); filetime_to_timespec(&(fdata.ftLastWriteTime), &(buf->st_mtim)); filetime_to_timespec(&(fdata.ftCreationTime), &(buf->st_ctim)); if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) { WIN32_FIND_DATAW findbuf; HANDLE handle = FindFirstFileW(wfilename, &findbuf); if (handle != INVALID_HANDLE_VALUE) { if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) && (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) { if (follow) { char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE]; buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE); } else { buf->st_mode = S_IFLNK; } buf->st_mode |= S_IREAD; if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY)) buf->st_mode |= S_IWRITE; } FindClose(handle); } } return 0; } switch (GetLastError()) { case ERROR_ACCESS_DENIED: case ERROR_SHARING_VIOLATION: case ERROR_LOCK_VIOLATION: case ERROR_SHARING_BUFFER_EXCEEDED: errno = EACCES; break; case ERROR_BUFFER_OVERFLOW: errno = ENAMETOOLONG; break; case ERROR_NOT_ENOUGH_MEMORY: errno = ENOMEM; break; case ERROR_PATH_NOT_FOUND: if (!has_valid_directory_prefix(wfilename)) { errno = ENOTDIR; break; } /* fallthru */ default: errno = ENOENT; break; } return -1; } /* We provide our own lstat/fstat functions, since the provided * lstat/fstat functions are so slow. These stat functions are * tailored for Git's usage (read: fast), and are not meant to be * complete. Note that Git stat()s are redirected to mingw_lstat() * too, since Windows doesn't really handle symlinks that well. */ static int do_stat_internal(int follow, const char *file_name, struct stat *buf) { int namelen; char alt_name[PATH_MAX]; if (!do_lstat(follow, file_name, buf)) return 0; /* if file_name ended in a '/', Windows returned ENOENT; * try again without trailing slashes */ if (errno != ENOENT) return -1; namelen = strlen(file_name); if (namelen && file_name[namelen-1] != '/') return -1; while (namelen && file_name[namelen-1] == '/') --namelen; if (!namelen || namelen >= PATH_MAX) return -1; memcpy(alt_name, file_name, namelen); alt_name[namelen] = 0; return do_lstat(follow, alt_name, buf); } static int get_file_info_by_handle(HANDLE hnd, struct stat *buf) { BY_HANDLE_FILE_INFORMATION fdata; if (!GetFileInformationByHandle(hnd, &fdata)) { errno = err_win_to_posix(GetLastError()); return -1; } buf->st_ino = 0; buf->st_gid = 0; buf->st_uid = 0; buf->st_nlink = 1; buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes); buf->st_size = fdata.nFileSizeLow | (((off_t)fdata.nFileSizeHigh)<<32); buf->st_dev = buf->st_rdev = 0; /* not used by Git */ filetime_to_timespec(&(fdata.ftLastAccessTime), &(buf->st_atim)); filetime_to_timespec(&(fdata.ftLastWriteTime), &(buf->st_mtim)); filetime_to_timespec(&(fdata.ftCreationTime), &(buf->st_ctim)); return 0; } int mingw_lstat(const char *file_name, struct stat *buf) { return do_stat_internal(0, file_name, buf); } int mingw_stat(const char *file_name, struct stat *buf) { return do_stat_internal(1, file_name, buf); } int mingw_fstat(int fd, struct stat *buf) { HANDLE fh = (HANDLE)_get_osfhandle(fd); DWORD avail, type = GetFileType(fh) & ~FILE_TYPE_REMOTE; switch (type) { case FILE_TYPE_DISK: return get_file_info_by_handle(fh, buf); case FILE_TYPE_CHAR: case FILE_TYPE_PIPE: /* initialize stat fields */ memset(buf, 0, sizeof(*buf)); buf->st_nlink = 1; if (type == FILE_TYPE_CHAR) { buf->st_mode = _S_IFCHR; } else { buf->st_mode = _S_IFIFO; if (PeekNamedPipe(fh, NULL, 0, NULL, &avail, NULL)) buf->st_size = avail; } return 0; default: errno = EBADF; return -1; } } static inline void time_t_to_filetime(time_t t, FILETIME *ft) { long long winTime = t * 10000000LL + 116444736000000000LL; ft->dwLowDateTime = winTime; ft->dwHighDateTime = winTime >> 32; } int mingw_utime (const char *file_name, const struct utimbuf *times) { FILETIME mft, aft; int fh, rc; DWORD attrs; wchar_t wfilename[MAX_PATH]; if (xutftowcs_path(wfilename, file_name) < 0) return -1; /* must have write permission */ attrs = GetFileAttributesW(wfilename); if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_READONLY)) { /* ignore errors here; open() will report them */ SetFileAttributesW(wfilename, attrs & ~FILE_ATTRIBUTE_READONLY); } if ((fh = _wopen(wfilename, O_RDWR | O_BINARY)) < 0) { rc = -1; goto revert_attrs; } if (times) { time_t_to_filetime(times->modtime, &mft); time_t_to_filetime(times->actime, &aft); } else { GetSystemTimeAsFileTime(&mft); aft = mft; } if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) { errno = EINVAL; rc = -1; } else rc = 0; close(fh); revert_attrs: if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_READONLY)) { /* ignore errors again */ SetFileAttributesW(wfilename, attrs); } return rc; } #undef strftime size_t mingw_strftime(char *s, size_t max, const char *format, const struct tm *tm) { size_t ret = strftime(s, max, format, tm); if (!ret && errno == EINVAL) die("invalid strftime format: '%s'", format); return ret; } unsigned int sleep (unsigned int seconds) { Sleep(seconds*1000); return 0; } char *mingw_mktemp(char *template) { wchar_t wtemplate[MAX_PATH]; if (xutftowcs_path(wtemplate, template) < 0) return NULL; if (!_wmktemp(wtemplate)) return NULL; if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0) return NULL; return template; } int mkstemp(char *template) { char *filename = mktemp(template); if (filename == NULL) return -1; return open(filename, O_RDWR | O_CREAT, 0600); } int gettimeofday(struct timeval *tv, void *tz) { FILETIME ft; long long hnsec; GetSystemTimeAsFileTime(&ft); hnsec = filetime_to_hnsec(&ft); tv->tv_sec = hnsec / 10000000; tv->tv_usec = (hnsec % 10000000) / 10; return 0; } int pipe(int filedes[2]) { HANDLE h[2]; /* this creates non-inheritable handles */ if (!CreatePipe(&h[0], &h[1], NULL, 8192)) { errno = err_win_to_posix(GetLastError()); return -1; } filedes[0] = _open_osfhandle(HCAST(int, h[0]), O_NOINHERIT); if (filedes[0] < 0) { CloseHandle(h[0]); CloseHandle(h[1]); return -1; } filedes[1] = _open_osfhandle(HCAST(int, h[1]), O_NOINHERIT); if (filedes[1] < 0) { close(filedes[0]); CloseHandle(h[1]); return -1; } return 0; } struct tm *gmtime_r(const time_t *timep, struct tm *result) { /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */ memcpy(result, gmtime(timep), sizeof(struct tm)); return result; } struct tm *localtime_r(const time_t *timep, struct tm *result) { /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */ memcpy(result, localtime(timep), sizeof(struct tm)); return result; } char *mingw_getcwd(char *pointer, int len) { wchar_t cwd[MAX_PATH], wpointer[MAX_PATH]; DWORD ret = GetCurrentDirectoryW(ARRAY_SIZE(cwd), cwd); if (!ret || ret >= ARRAY_SIZE(cwd)) { errno = ret ? ENAMETOOLONG : err_win_to_posix(GetLastError()); return NULL; } ret = GetLongPathNameW(cwd, wpointer, ARRAY_SIZE(wpointer)); if (!ret && GetLastError() == ERROR_ACCESS_DENIED) { HANDLE hnd = CreateFileW(cwd, 0, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL); if (hnd == INVALID_HANDLE_VALUE) return NULL; ret = GetFinalPathNameByHandleW(hnd, wpointer, ARRAY_SIZE(wpointer), 0); CloseHandle(hnd); if (!ret || ret >= ARRAY_SIZE(wpointer)) return NULL; if (xwcstoutf(pointer, normalize_ntpath(wpointer), len) < 0) return NULL; return pointer; } if (!ret || ret >= ARRAY_SIZE(wpointer)) return NULL; if (xwcstoutf(pointer, wpointer, len) < 0) return NULL; convert_slashes(pointer); return pointer; } /* * See "Parsing C++ Command-Line Arguments" at Microsoft's Docs: * https://docs.microsoft.com/en-us/cpp/cpp/parsing-cpp-command-line-arguments */ static const char *quote_arg_msvc(const char *arg) { /* count chars to quote */ int len = 0, n = 0; int force_quotes = 0; char *q, *d; const char *p = arg; if (!*p) force_quotes = 1; while (*p) { if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'') force_quotes = 1; else if (*p == '"') n++; else if (*p == '\\') { int count = 0; while (*p == '\\') { count++; p++; len++; } if (*p == '"') n += count*2 + 1; continue; } len++; p++; } if (!force_quotes && n == 0) return arg; /* insert \ where necessary */ d = q = xmalloc(st_add3(len, n, 3)); *d++ = '"'; while (*arg) { if (*arg == '"') *d++ = '\\'; else if (*arg == '\\') { int count = 0; while (*arg == '\\') { count++; *d++ = *arg++; } if (*arg == '"') { while (count-- > 0) *d++ = '\\'; *d++ = '\\'; } } *d++ = *arg++; } *d++ = '"'; *d++ = 0; return q; } #include "quote.h" static const char *quote_arg_msys2(const char *arg) { struct strbuf buf = STRBUF_INIT; const char *p2 = arg, *p; for (p = arg; *p; p++) { int ws = isspace(*p); if (!ws && *p != '\\' && *p != '"' && *p != '{') continue; if (!buf.len) strbuf_addch(&buf, '"'); if (p != p2) strbuf_add(&buf, p2, p - p2); if (!ws && *p != '{') strbuf_addch(&buf, '\\'); p2 = p; } if (p == arg) strbuf_addch(&buf, '"'); else if (!buf.len) return arg; else strbuf_add(&buf, p2, p - p2), strbuf_addch(&buf, '"'); return strbuf_detach(&buf, 0); } static const char *parse_interpreter(const char *cmd) { static char buf[100]; char *p, *opt; int n, fd; /* don't even try a .exe */ n = strlen(cmd); if (n >= 4 && !strcasecmp(cmd+n-4, ".exe")) return NULL; fd = open(cmd, O_RDONLY); if (fd < 0) return NULL; n = read(fd, buf, sizeof(buf)-1); close(fd); if (n < 4) /* at least '#!/x' and not error */ return NULL; if (buf[0] != '#' || buf[1] != '!') return NULL; buf[n] = '\0'; p = buf + strcspn(buf, "\r\n"); if (!*p) return NULL; *p = '\0'; if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\'))) return NULL; /* strip options */ if ((opt = strchr(p+1, ' '))) *opt = '\0'; return p+1; } /* * exe_only means that we only want to detect .exe files, but not scripts * (which do not have an extension) */ static char *lookup_prog(const char *dir, int dirlen, const char *cmd, int isexe, int exe_only) { char path[MAX_PATH]; snprintf(path, sizeof(path), "%.*s\\%s.exe", dirlen, dir, cmd); if (!isexe && access(path, F_OK) == 0) return xstrdup(path); path[strlen(path)-4] = '\0'; if ((!exe_only || isexe) && access(path, F_OK) == 0) if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY)) return xstrdup(path); return NULL; } /* * Determines the absolute path of cmd using the split path in path. * If cmd contains a slash or backslash, no lookup is performed. */ static char *path_lookup(const char *cmd, int exe_only) { const char *path; char *prog = NULL; int len = strlen(cmd); int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe"); if (strchr(cmd, '/') || strchr(cmd, '\\')) return xstrdup(cmd); path = mingw_getenv("PATH"); if (!path) return NULL; while (!prog) { const char *sep = strchrnul(path, ';'); int dirlen = sep - path; if (dirlen) prog = lookup_prog(path, dirlen, cmd, isexe, exe_only); if (!*sep) break; path = sep + 1; } return prog; } static const wchar_t *wcschrnul(const wchar_t *s, wchar_t c) { while (*s && *s != c) s++; return s; } /* Compare only keys */ static int wenvcmp(const void *a, const void *b) { wchar_t *p = *(wchar_t **)a, *q = *(wchar_t **)b; size_t p_len, q_len; /* Find the keys */ p_len = wcschrnul(p, L'=') - p; q_len = wcschrnul(q, L'=') - q; /* If the length differs, include the shorter key's NUL */ if (p_len < q_len) p_len++; else if (p_len > q_len) p_len = q_len + 1; return _wcsnicmp(p, q, p_len); } /* We need a stable sort to convert the environment between UTF-16 <-> UTF-8 */ #ifndef INTERNAL_QSORT #include "qsort.c" #endif /* * Build an environment block combining the inherited environment * merged with the given list of settings. * * Values of the form "KEY=VALUE" in deltaenv override inherited values. * Values of the form "KEY" in deltaenv delete inherited values. * * Multiple entries in deltaenv for the same key are explicitly allowed. * * We return a contiguous block of UNICODE strings with a final trailing * zero word. */ static wchar_t *make_environment_block(char **deltaenv) { wchar_t *wenv = GetEnvironmentStringsW(), *wdeltaenv, *result, *p; size_t wlen, s, delta_size, size; wchar_t **array = NULL; size_t alloc = 0, nr = 0, i; size = 1; /* for extra NUL at the end */ /* If there is no deltaenv to apply, simply return a copy. */ if (!deltaenv || !*deltaenv) { for (p = wenv; p && *p; ) { size_t s = wcslen(p) + 1; size += s; p += s; } ALLOC_ARRAY(result, size); memcpy(result, wenv, size * sizeof(*wenv)); FreeEnvironmentStringsW(wenv); return result; } /* * If there is a deltaenv, let's accumulate all keys into `array`, * sort them using the stable git_qsort() and then copy, skipping * duplicate keys */ for (p = wenv; p && *p; ) { ALLOC_GROW(array, nr + 1, alloc); s = wcslen(p) + 1; array[nr++] = p; p += s; size += s; } /* (over-)assess size needed for wchar version of deltaenv */ for (delta_size = 0, i = 0; deltaenv[i]; i++) delta_size += strlen(deltaenv[i]) * 2 + 1; ALLOC_ARRAY(wdeltaenv, delta_size); /* convert the deltaenv, appending to array */ for (i = 0, p = wdeltaenv; deltaenv[i]; i++) { ALLOC_GROW(array, nr + 1, alloc); wlen = xutftowcs(p, deltaenv[i], wdeltaenv + delta_size - p); array[nr++] = p; p += wlen + 1; } git_qsort(array, nr, sizeof(*array), wenvcmp); ALLOC_ARRAY(result, size + delta_size); for (p = result, i = 0; i < nr; i++) { /* Skip any duplicate keys; last one wins */ while (i + 1 < nr && !wenvcmp(array + i, array + i + 1)) i++; /* Skip "to delete" entry */ if (!wcschr(array[i], L'=')) continue; size = wcslen(array[i]) + 1; memcpy(p, array[i], size * sizeof(*p)); p += size; } *p = L'\0'; free(array); free(wdeltaenv); FreeEnvironmentStringsW(wenv); return result; } static void do_unset_environment_variables(void) { static int done; char *p = unset_environment_variables; if (done || !p) return; done = 1; for (;;) { char *comma = strchr(p, ','); if (comma) *comma = '\0'; unsetenv(p); if (!comma) break; p = comma + 1; } } struct pinfo_t { struct pinfo_t *next; pid_t pid; HANDLE proc; }; static struct pinfo_t *pinfo = NULL; CRITICAL_SECTION pinfo_cs; /* Used to match and chomp off path components */ static inline int match_last_path_component(const char *path, size_t *len, const char *component) { size_t component_len = strlen(component); if (*len < component_len + 1 || !is_dir_sep(path[*len - component_len - 1]) || fspathncmp(path + *len - component_len, component, component_len)) return 0; *len -= component_len + 1; /* chomp off repeated dir separators */ while (*len > 0 && is_dir_sep(path[*len - 1])) (*len)--; return 1; } static int is_msys2_sh(const char *cmd) { if (cmd && !strcmp(cmd, "sh")) { static int ret = -1; char *p; if (ret >= 0) return ret; p = path_lookup(cmd, 0); if (!p) ret = 0; else { size_t len = strlen(p); ret = match_last_path_component(p, &len, "sh.exe") && match_last_path_component(p, &len, "bin") && match_last_path_component(p, &len, "usr"); free(p); } return ret; } return 0; } static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv, const char *dir, int prepend_cmd, int fhin, int fhout, int fherr) { STARTUPINFOW si; PROCESS_INFORMATION pi; struct strbuf args; wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL; unsigned flags = CREATE_UNICODE_ENVIRONMENT; BOOL ret; HANDLE cons; const char *(*quote_arg)(const char *arg) = is_msys2_sh(*argv) ? quote_arg_msys2 : quote_arg_msvc; do_unset_environment_variables(); /* Determine whether or not we are associated to a console */ cons = CreateFileW(L"CONOUT$", GENERIC_WRITE, FILE_SHARE_WRITE, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); if (cons == INVALID_HANDLE_VALUE) { /* There is no console associated with this process. * Since the child is a console process, Windows * would normally create a console window. But * since we'll be redirecting std streams, we do * not need the console. * It is necessary to use DETACHED_PROCESS * instead of CREATE_NO_WINDOW to make ssh * recognize that it has no console. */ flags |= DETACHED_PROCESS; } else { /* There is already a console. If we specified * DETACHED_PROCESS here, too, Windows would * disassociate the child from the console. * The same is true for CREATE_NO_WINDOW. * Go figure! */ CloseHandle(cons); } memset(&si, 0, sizeof(si)); si.cb = sizeof(si); si.dwFlags = STARTF_USESTDHANDLES; si.hStdInput = winansi_get_osfhandle(fhin); si.hStdOutput = winansi_get_osfhandle(fhout); si.hStdError = winansi_get_osfhandle(fherr); if (xutftowcs_path(wcmd, cmd) < 0) return -1; if (dir && xutftowcs_path(wdir, dir) < 0) return -1; /* concatenate argv, quoting args as we go */ strbuf_init(&args, 0); if (prepend_cmd) { char *quoted = (char *)quote_arg(cmd); strbuf_addstr(&args, quoted); if (quoted != cmd) free(quoted); } for (; *argv; argv++) { char *quoted = (char *)quote_arg(*argv); if (*args.buf) strbuf_addch(&args, ' '); strbuf_addstr(&args, quoted); if (quoted != *argv) free(quoted); } ALLOC_ARRAY(wargs, st_add(st_mult(2, args.len), 1)); xutftowcs(wargs, args.buf, 2 * args.len + 1); strbuf_release(&args); wenvblk = make_environment_block(deltaenv); memset(&pi, 0, sizeof(pi)); ret = CreateProcessW(wcmd, wargs, NULL, NULL, TRUE, flags, wenvblk, dir ? wdir : NULL, &si, &pi); free(wenvblk); free(wargs); if (!ret) { errno = ENOENT; return -1; } CloseHandle(pi.hThread); /* * The process ID is the human-readable identifier of the process * that we want to present in log and error messages. The handle * is not useful for this purpose. But we cannot close it, either, * because it is not possible to turn a process ID into a process * handle after the process terminated. * Keep the handle in a list for waitpid. */ EnterCriticalSection(&pinfo_cs); { struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t)); info->pid = pi.dwProcessId; info->proc = pi.hProcess; info->next = pinfo; pinfo = info; } LeaveCriticalSection(&pinfo_cs); return (pid_t)pi.dwProcessId; } static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd) { return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2); } pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv, const char *dir, int fhin, int fhout, int fherr) { pid_t pid; char *prog = path_lookup(cmd, 0); if (!prog) { errno = ENOENT; pid = -1; } else { const char *interpr = parse_interpreter(prog); if (interpr) { const char *argv0 = argv[0]; char *iprog = path_lookup(interpr, 1); argv[0] = prog; if (!iprog) { errno = ENOENT; pid = -1; } else { pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1, fhin, fhout, fherr); free(iprog); } argv[0] = argv0; } else pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0, fhin, fhout, fherr); free(prog); } return pid; } static int try_shell_exec(const char *cmd, char *const *argv) { const char *interpr = parse_interpreter(cmd); char *prog; int pid = 0; if (!interpr) return 0; prog = path_lookup(interpr, 1); if (prog) { int exec_id; int argc = 0; #ifndef _MSC_VER const #endif char **argv2; while (argv[argc]) argc++; ALLOC_ARRAY(argv2, argc + 1); argv2[0] = (char *)cmd; /* full path to the script file */ memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc); exec_id = trace2_exec(prog, argv2); pid = mingw_spawnv(prog, argv2, 1); if (pid >= 0) { int status; if (waitpid(pid, &status, 0) < 0) status = 255; trace2_exec_result(exec_id, status); exit(status); } trace2_exec_result(exec_id, -1); pid = 1; /* indicate that we tried but failed */ free(prog); free(argv2); } return pid; } int mingw_execv(const char *cmd, char *const *argv) { /* check if git_command is a shell script */ if (!try_shell_exec(cmd, argv)) { int pid, status; int exec_id; exec_id = trace2_exec(cmd, (const char **)argv); pid = mingw_spawnv(cmd, (const char **)argv, 0); if (pid < 0) { trace2_exec_result(exec_id, -1); return -1; } if (waitpid(pid, &status, 0) < 0) status = 255; trace2_exec_result(exec_id, status); exit(status); } return -1; } int mingw_execvp(const char *cmd, char *const *argv) { char *prog = path_lookup(cmd, 0); if (prog) { mingw_execv(prog, argv); free(prog); } else errno = ENOENT; return -1; } int mingw_kill(pid_t pid, int sig) { if (pid > 0 && sig == SIGTERM) { HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid); if (TerminateProcess(h, -1)) { CloseHandle(h); return 0; } errno = err_win_to_posix(GetLastError()); CloseHandle(h); return -1; } else if (pid > 0 && sig == 0) { HANDLE h = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid); if (h) { CloseHandle(h); return 0; } } errno = EINVAL; return -1; } /* * UTF-8 versions of getenv(), putenv() and unsetenv(). * Internally, they use the CRT's stock UNICODE routines * to avoid data loss. */ char *mingw_getenv(const char *name) { #define GETENV_MAX_RETAIN 64 static char *values[GETENV_MAX_RETAIN]; static int value_counter; int len_key, len_value; wchar_t *w_key; char *value; wchar_t w_value[32768]; if (!name || !*name) return NULL; len_key = strlen(name) + 1; /* We cannot use xcalloc() here because that uses getenv() itself */ w_key = calloc(len_key, sizeof(wchar_t)); if (!w_key) die("Out of memory, (tried to allocate %u wchar_t's)", len_key); xutftowcs(w_key, name, len_key); /* GetEnvironmentVariableW() only sets the last error upon failure */ SetLastError(ERROR_SUCCESS); len_value = GetEnvironmentVariableW(w_key, w_value, ARRAY_SIZE(w_value)); if (!len_value && GetLastError() == ERROR_ENVVAR_NOT_FOUND) { free(w_key); return NULL; } free(w_key); len_value = len_value * 3 + 1; /* We cannot use xcalloc() here because that uses getenv() itself */ value = calloc(len_value, sizeof(char)); if (!value) die("Out of memory, (tried to allocate %u bytes)", len_value); xwcstoutf(value, w_value, len_value); /* * We return `value` which is an allocated value and the caller is NOT * expecting to have to free it, so we keep a round-robin array, * invalidating the buffer after GETENV_MAX_RETAIN getenv() calls. */ free(values[value_counter]); values[value_counter++] = value; if (value_counter >= ARRAY_SIZE(values)) value_counter = 0; return value; } int mingw_putenv(const char *namevalue) { int size; wchar_t *wide, *equal; BOOL result; if (!namevalue || !*namevalue) return 0; size = strlen(namevalue) * 2 + 1; wide = calloc(size, sizeof(wchar_t)); if (!wide) die("Out of memory, (tried to allocate %u wchar_t's)", size); xutftowcs(wide, namevalue, size); equal = wcschr(wide, L'='); if (!equal) result = SetEnvironmentVariableW(wide, NULL); else { *equal = L'\0'; result = SetEnvironmentVariableW(wide, equal + 1); } free(wide); if (!result) errno = err_win_to_posix(GetLastError()); return result ? 0 : -1; } static void ensure_socket_initialization(void) { WSADATA wsa; static int initialized = 0; if (initialized) return; if (WSAStartup(MAKEWORD(2,2), &wsa)) die("unable to initialize winsock subsystem, error %d", WSAGetLastError()); atexit((void(*)(void)) WSACleanup); initialized = 1; } #undef gethostname int mingw_gethostname(char *name, int namelen) { ensure_socket_initialization(); return gethostname(name, namelen); } #undef gethostbyname struct hostent *mingw_gethostbyname(const char *host) { ensure_socket_initialization(); return gethostbyname(host); } #undef getaddrinfo int mingw_getaddrinfo(const char *node, const char *service, const struct addrinfo *hints, struct addrinfo **res) { ensure_socket_initialization(); return getaddrinfo(node, service, hints, res); } int mingw_socket(int domain, int type, int protocol) { int sockfd; SOCKET s; ensure_socket_initialization(); s = WSASocket(domain, type, protocol, NULL, 0, 0); if (s == INVALID_SOCKET) { /* * WSAGetLastError() values are regular BSD error codes * biased by WSABASEERR. * However, strerror() does not know about networking * specific errors, which are values beginning at 38 or so. * Therefore, we choose to leave the biased error code * in errno so that _if_ someone looks up the code somewhere, * then it is at least the number that are usually listed. */ errno = WSAGetLastError(); return -1; } /* convert into a file descriptor */ if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) { closesocket(s); return error("unable to make a socket file descriptor: %s", strerror(errno)); } return sockfd; } #undef connect int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz) { SOCKET s = (SOCKET)_get_osfhandle(sockfd); return connect(s, sa, sz); } #undef bind int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz) { SOCKET s = (SOCKET)_get_osfhandle(sockfd); return bind(s, sa, sz); } #undef setsockopt int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen) { SOCKET s = (SOCKET)_get_osfhandle(sockfd); return setsockopt(s, lvl, optname, (const char*)optval, optlen); } #undef shutdown int mingw_shutdown(int sockfd, int how) { SOCKET s = (SOCKET)_get_osfhandle(sockfd); return shutdown(s, how); } #undef listen int mingw_listen(int sockfd, int backlog) { SOCKET s = (SOCKET)_get_osfhandle(sockfd); return listen(s, backlog); } #undef accept int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz) { int sockfd2; SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1); SOCKET s2 = accept(s1, sa, sz); /* convert into a file descriptor */ if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) { int err = errno; closesocket(s2); return error("unable to make a socket file descriptor: %s", strerror(err)); } return sockfd2; } #undef rename int mingw_rename(const char *pold, const char *pnew) { DWORD attrs, gle; int tries = 0; wchar_t wpold[MAX_PATH], wpnew[MAX_PATH]; if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0) return -1; /* * Try native rename() first to get errno right. * It is based on MoveFile(), which cannot overwrite existing files. */ if (!_wrename(wpold, wpnew)) return 0; if (errno != EEXIST) return -1; repeat: if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING)) return 0; /* TODO: translate more errors */ gle = GetLastError(); if (gle == ERROR_ACCESS_DENIED && (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) { if (attrs & FILE_ATTRIBUTE_DIRECTORY) { DWORD attrsold = GetFileAttributesW(wpold); if (attrsold == INVALID_FILE_ATTRIBUTES || !(attrsold & FILE_ATTRIBUTE_DIRECTORY)) errno = EISDIR; else if (!_wrmdir(wpnew)) goto repeat; return -1; } if ((attrs & FILE_ATTRIBUTE_READONLY) && SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) { if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING)) return 0; gle = GetLastError(); /* revert file attributes on failure */ SetFileAttributesW(wpnew, attrs); } } if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) { /* * We assume that some other process had the source or * destination file open at the wrong moment and retry. * In order to give the other process a higher chance to * complete its operation, we give up our time slice now. * If we have to retry again, we do sleep a bit. */ Sleep(delay[tries]); tries++; goto repeat; } if (gle == ERROR_ACCESS_DENIED && ask_yes_no_if_possible("Rename from '%s' to '%s' failed. " "Should I try again?", pold, pnew)) goto repeat; errno = EACCES; return -1; } /* * Note that this doesn't return the actual pagesize, but * the allocation granularity. If future Windows specific git code * needs the real getpagesize function, we need to find another solution. */ int mingw_getpagesize(void) { SYSTEM_INFO si; GetSystemInfo(&si); return si.dwAllocationGranularity; } /* See https://msdn.microsoft.com/en-us/library/windows/desktop/ms724435.aspx */ enum EXTENDED_NAME_FORMAT { NameDisplay = 3, NameUserPrincipal = 8 }; static char *get_extended_user_info(enum EXTENDED_NAME_FORMAT type) { DECLARE_PROC_ADDR(secur32.dll, BOOL, GetUserNameExW, enum EXTENDED_NAME_FORMAT, LPCWSTR, PULONG); static wchar_t wbuffer[1024]; DWORD len; if (!INIT_PROC_ADDR(GetUserNameExW)) return NULL; len = ARRAY_SIZE(wbuffer); if (GetUserNameExW(type, wbuffer, &len)) { char *converted = xmalloc((len *= 3)); if (xwcstoutf(converted, wbuffer, len) >= 0) return converted; free(converted); } return NULL; } char *mingw_query_user_email(void) { return get_extended_user_info(NameUserPrincipal); } struct passwd *getpwuid(int uid) { static unsigned initialized; static char user_name[100]; static struct passwd *p; wchar_t buf[100]; DWORD len; if (initialized) return p; len = ARRAY_SIZE(buf); if (!GetUserNameW(buf, &len)) { initialized = 1; return NULL; } if (xwcstoutf(user_name, buf, sizeof(user_name)) < 0) { initialized = 1; return NULL; } p = xmalloc(sizeof(*p)); p->pw_name = user_name; p->pw_gecos = get_extended_user_info(NameDisplay); if (!p->pw_gecos) p->pw_gecos = "unknown"; p->pw_dir = NULL; initialized = 1; return p; } static HANDLE timer_event; static HANDLE timer_thread; static int timer_interval; static int one_shot; static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL; /* The timer works like this: * The thread, ticktack(), is a trivial routine that most of the time * only waits to receive the signal to terminate. The main thread tells * the thread to terminate by setting the timer_event to the signalled * state. * But ticktack() interrupts the wait state after the timer's interval * length to call the signal handler. */ static unsigned __stdcall ticktack(void *dummy) { while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) { mingw_raise(SIGALRM); if (one_shot) break; } return 0; } static int start_timer_thread(void) { timer_event = CreateEvent(NULL, FALSE, FALSE, NULL); if (timer_event) { timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL); if (!timer_thread ) return errno = ENOMEM, error("cannot start timer thread"); } else return errno = ENOMEM, error("cannot allocate resources for timer"); return 0; } static void stop_timer_thread(void) { if (timer_event) SetEvent(timer_event); /* tell thread to terminate */ if (timer_thread) { int rc = WaitForSingleObject(timer_thread, 10000); if (rc == WAIT_TIMEOUT) error("timer thread did not terminate timely"); else if (rc != WAIT_OBJECT_0) error("waiting for timer thread failed: %lu", GetLastError()); CloseHandle(timer_thread); } if (timer_event) CloseHandle(timer_event); timer_event = NULL; timer_thread = NULL; } static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2) { return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec; } int setitimer(int type, struct itimerval *in, struct itimerval *out) { static const struct timeval zero; static int atexit_done; if (out != NULL) return errno = EINVAL, error("setitimer param 3 != NULL not implemented"); if (!is_timeval_eq(&in->it_interval, &zero) && !is_timeval_eq(&in->it_interval, &in->it_value)) return errno = EINVAL, error("setitimer: it_interval must be zero or eq it_value"); if (timer_thread) stop_timer_thread(); if (is_timeval_eq(&in->it_value, &zero) && is_timeval_eq(&in->it_interval, &zero)) return 0; timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000; one_shot = is_timeval_eq(&in->it_interval, &zero); if (!atexit_done) { atexit(stop_timer_thread); atexit_done = 1; } return start_timer_thread(); } int sigaction(int sig, struct sigaction *in, struct sigaction *out) { if (sig != SIGALRM) return errno = EINVAL, error("sigaction only implemented for SIGALRM"); if (out != NULL) return errno = EINVAL, error("sigaction: param 3 != NULL not implemented"); timer_fn = in->sa_handler; return 0; } #undef signal sig_handler_t mingw_signal(int sig, sig_handler_t handler) { sig_handler_t old; switch (sig) { case SIGALRM: old = timer_fn; timer_fn = handler; break; case SIGINT: old = sigint_fn; sigint_fn = handler; break; default: return signal(sig, handler); } return old; } #undef raise int mingw_raise(int sig) { switch (sig) { case SIGALRM: if (timer_fn == SIG_DFL) { if (isatty(STDERR_FILENO)) fputs("Alarm clock\n", stderr); exit(128 + SIGALRM); } else if (timer_fn != SIG_IGN) timer_fn(SIGALRM); return 0; case SIGINT: if (sigint_fn == SIG_DFL) exit(128 + SIGINT); else if (sigint_fn != SIG_IGN) sigint_fn(SIGINT); return 0; #if defined(_MSC_VER) case SIGILL: case SIGFPE: case SIGSEGV: case SIGTERM: case SIGBREAK: case SIGABRT: case SIGABRT_COMPAT: /* * The header in the MS C Runtime defines 8 signals * as being supported on the platform. Anything else causes an * "Invalid signal or error" (which in DEBUG builds causes the * Abort/Retry/Ignore dialog). We by-pass the CRT for things we * already know will fail. */ return raise(sig); default: errno = EINVAL; return -1; #else default: return raise(sig); #endif } } int link(const char *oldpath, const char *newpath) { wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH]; if (xutftowcs_path(woldpath, oldpath) < 0 || xutftowcs_path(wnewpath, newpath) < 0) return -1; if (!CreateHardLinkW(wnewpath, woldpath, NULL)) { errno = err_win_to_posix(GetLastError()); return -1; } return 0; } pid_t waitpid(pid_t pid, int *status, int options) { HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION, FALSE, pid); if (!h) { errno = ECHILD; return -1; } if (pid > 0 && options & WNOHANG) { if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) { CloseHandle(h); return 0; } options &= ~WNOHANG; } if (options == 0) { struct pinfo_t **ppinfo; if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) { CloseHandle(h); return 0; } if (status) GetExitCodeProcess(h, (LPDWORD)status); EnterCriticalSection(&pinfo_cs); ppinfo = &pinfo; while (*ppinfo) { struct pinfo_t *info = *ppinfo; if (info->pid == pid) { CloseHandle(info->proc); *ppinfo = info->next; free(info); break; } ppinfo = &info->next; } LeaveCriticalSection(&pinfo_cs); CloseHandle(h); return pid; } CloseHandle(h); errno = EINVAL; return -1; } int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen) { int upos = 0, wpos = 0; const unsigned char *utf = (const unsigned char*) utfs; if (!utf || !wcs || wcslen < 1) { errno = EINVAL; return -1; } /* reserve space for \0 */ wcslen--; if (utflen < 0) utflen = INT_MAX; while (upos < utflen) { int c = utf[upos++] & 0xff; if (utflen == INT_MAX && c == 0) break; if (wpos >= wcslen) { wcs[wpos] = 0; errno = ERANGE; return -1; } if (c < 0x80) { /* ASCII */ wcs[wpos++] = c; } else if (c >= 0xc2 && c < 0xe0 && upos < utflen && (utf[upos] & 0xc0) == 0x80) { /* 2-byte utf-8 */ c = ((c & 0x1f) << 6); c |= (utf[upos++] & 0x3f); wcs[wpos++] = c; } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen && !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */ (utf[upos] & 0xc0) == 0x80 && (utf[upos + 1] & 0xc0) == 0x80) { /* 3-byte utf-8 */ c = ((c & 0x0f) << 12); c |= ((utf[upos++] & 0x3f) << 6); c |= (utf[upos++] & 0x3f); wcs[wpos++] = c; } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen && wpos + 1 < wcslen && !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */ !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */ (utf[upos] & 0xc0) == 0x80 && (utf[upos + 1] & 0xc0) == 0x80 && (utf[upos + 2] & 0xc0) == 0x80) { /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */ c = ((c & 0x07) << 18); c |= ((utf[upos++] & 0x3f) << 12); c |= ((utf[upos++] & 0x3f) << 6); c |= (utf[upos++] & 0x3f); c -= 0x10000; wcs[wpos++] = 0xd800 | (c >> 10); wcs[wpos++] = 0xdc00 | (c & 0x3ff); } else if (c >= 0xa0) { /* invalid utf-8 byte, printable unicode char: convert 1:1 */ wcs[wpos++] = c; } else { /* invalid utf-8 byte, non-printable unicode: convert to hex */ static const char *hex = "0123456789abcdef"; wcs[wpos++] = hex[c >> 4]; if (wpos < wcslen) wcs[wpos++] = hex[c & 0x0f]; } } wcs[wpos] = 0; return wpos; } int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen) { if (!wcs || !utf || utflen < 1) { errno = EINVAL; return -1; } utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL); if (utflen) return utflen - 1; errno = ERANGE; return -1; } static void setup_windows_environment(void) { char *tmp = getenv("TMPDIR"); /* on Windows it is TMP and TEMP */ if (!tmp) { if (!(tmp = getenv("TMP"))) tmp = getenv("TEMP"); if (tmp) { setenv("TMPDIR", tmp, 1); tmp = getenv("TMPDIR"); } } if (tmp) { /* * Convert all dir separators to forward slashes, * to help shell commands called from the Git * executable (by not mistaking the dir separators * for escape characters). */ convert_slashes(tmp); } /* simulate TERM to enable auto-color (see color.c) */ if (!getenv("TERM")) setenv("TERM", "cygwin", 1); } #if !defined(_MSC_VER) /* * Disable MSVCRT command line wildcard expansion (__getmainargs called from * mingw startup code, see init.c in mingw runtime). */ int _CRT_glob = 0; #endif static NORETURN void die_startup(void) { fputs("fatal: not enough memory for initialization", stderr); exit(128); } static void *malloc_startup(size_t size) { void *result = malloc(size); if (!result) die_startup(); return result; } static char *wcstoutfdup_startup(char *buffer, const wchar_t *wcs, size_t len) { len = xwcstoutf(buffer, wcs, len) + 1; return memcpy(malloc_startup(len), buffer, len); } static void maybe_redirect_std_handle(const wchar_t *key, DWORD std_id, int fd, DWORD desired_access, DWORD flags) { DWORD create_flag = fd ? OPEN_ALWAYS : OPEN_EXISTING; wchar_t buf[MAX_PATH]; DWORD max = ARRAY_SIZE(buf); HANDLE handle; DWORD ret = GetEnvironmentVariableW(key, buf, max); if (!ret || ret >= max) return; /* make sure this does not leak into child processes */ SetEnvironmentVariableW(key, NULL); if (!wcscmp(buf, L"off")) { close(fd); handle = GetStdHandle(std_id); if (handle != INVALID_HANDLE_VALUE) CloseHandle(handle); return; } if (std_id == STD_ERROR_HANDLE && !wcscmp(buf, L"2>&1")) { handle = GetStdHandle(STD_OUTPUT_HANDLE); if (handle == INVALID_HANDLE_VALUE) { close(fd); handle = GetStdHandle(std_id); if (handle != INVALID_HANDLE_VALUE) CloseHandle(handle); } else { int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY); SetStdHandle(std_id, handle); dup2(new_fd, fd); /* do *not* close the new_fd: that would close stdout */ } return; } handle = CreateFileW(buf, desired_access, 0, NULL, create_flag, flags, NULL); if (handle != INVALID_HANDLE_VALUE) { int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY); SetStdHandle(std_id, handle); dup2(new_fd, fd); close(new_fd); } } static void maybe_redirect_std_handles(void) { maybe_redirect_std_handle(L"GIT_REDIRECT_STDIN", STD_INPUT_HANDLE, 0, GENERIC_READ, FILE_ATTRIBUTE_NORMAL); maybe_redirect_std_handle(L"GIT_REDIRECT_STDOUT", STD_OUTPUT_HANDLE, 1, GENERIC_WRITE, FILE_ATTRIBUTE_NORMAL); maybe_redirect_std_handle(L"GIT_REDIRECT_STDERR", STD_ERROR_HANDLE, 2, GENERIC_WRITE, FILE_FLAG_NO_BUFFERING); } #ifdef _MSC_VER #ifdef _DEBUG #include #endif #endif /* * We implement wmain() and compile with -municode, which would * normally ignore main(), but we call the latter from the former * so that we can handle non-ASCII command-line parameters * appropriately. * * To be more compatible with the core git code, we convert * argv into UTF8 and pass them directly to main(). */ int wmain(int argc, const wchar_t **wargv) { int i, maxlen, exit_status; char *buffer, **save; const char **argv; trace2_initialize_clock(); #ifdef _MSC_VER #ifdef _DEBUG _CrtSetReportMode(_CRT_ASSERT, _CRTDBG_MODE_DEBUG); #endif #ifdef USE_MSVC_CRTDBG _CrtSetDbgFlag(_CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF); #endif #endif maybe_redirect_std_handles(); /* determine size of argv and environ conversion buffer */ maxlen = wcslen(wargv[0]); for (i = 1; i < argc; i++) maxlen = max(maxlen, wcslen(wargv[i])); /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */ maxlen = 3 * maxlen + 1; buffer = malloc_startup(maxlen); /* * Create a UTF-8 version of w_argv. Also create a "save" copy * to remember all the string pointers because parse_options() * will remove claimed items from the argv that we pass down. */ ALLOC_ARRAY(argv, argc + 1); ALLOC_ARRAY(save, argc + 1); for (i = 0; i < argc; i++) argv[i] = save[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen); argv[i] = save[i] = NULL; free(buffer); /* fix Windows specific environment settings */ setup_windows_environment(); unset_environment_variables = xstrdup("PERL5LIB"); /* initialize critical section for waitpid pinfo_t list */ InitializeCriticalSection(&pinfo_cs); /* set up default file mode and file modes for stdin/out/err */ _fmode = _O_BINARY; _setmode(_fileno(stdin), _O_BINARY); _setmode(_fileno(stdout), _O_BINARY); _setmode(_fileno(stderr), _O_BINARY); /* initialize Unicode console */ winansi_init(); /* invoke the real main() using our utf8 version of argv. */ exit_status = main(argc, argv); for (i = 0; i < argc; i++) free(save[i]); free(save); free(argv); return exit_status; } int uname(struct utsname *buf) { unsigned v = (unsigned)GetVersion(); memset(buf, 0, sizeof(*buf)); xsnprintf(buf->sysname, sizeof(buf->sysname), "Windows"); xsnprintf(buf->release, sizeof(buf->release), "%u.%u", v & 0xff, (v >> 8) & 0xff); /* assuming NT variants only.. */ xsnprintf(buf->version, sizeof(buf->version), "%u", (v >> 16) & 0x7fff); return 0; }