| #define WIN32_LEAN_AND_MEAN |
| #include "../git-compat-util.h" |
| #include "win32.h" |
| #include "../cache.h" /* to read configuration */ |
| |
| static inline void filetime_to_timespec(const FILETIME *ft, struct timespec *ts) |
| { |
| long long winTime = ((long long)ft->dwHighDateTime << 32) + |
| ft->dwLowDateTime; |
| winTime -= 116444736000000000LL; /* Windows to Unix Epoch conversion */ |
| /* convert 100-nsecond interval to seconds and nanoseconds */ |
| ts->tv_sec = (time_t)(winTime/10000000); |
| ts->tv_nsec = (long)(winTime - ts->tv_sec*10000000LL) * 100; |
| } |
| |
| #define size_to_blocks(s) (((s)+511)/512) |
| |
| /* do_stat is a common implementation for cygwin_lstat and cygwin_stat. |
| * |
| * To simplify its logic, in the case of cygwin symlinks, this implementation |
| * falls back to the cygwin version of stat/lstat, which is provided as the |
| * last argument. |
| */ |
| static int do_stat(const char *file_name, struct stat *buf, stat_fn_t cygstat) |
| { |
| WIN32_FILE_ATTRIBUTE_DATA fdata; |
| |
| if (file_name[0] == '/') |
| return cygstat (file_name, buf); |
| |
| if (!(errno = get_file_attr(file_name, &fdata))) { |
| /* |
| * If the system attribute is set and it is not a directory then |
| * it could be a symbol link created in the nowinsymlinks mode. |
| * Normally, Cygwin works in the winsymlinks mode, so this situation |
| * is very unlikely. For the sake of simplicity of our code, let's |
| * Cygwin to handle it. |
| */ |
| if ((fdata.dwFileAttributes & FILE_ATTRIBUTE_SYSTEM) && |
| !(fdata.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)) |
| return cygstat(file_name, buf); |
| |
| /* fill out the stat structure */ |
| buf->st_dev = buf->st_rdev = 0; /* not used by Git */ |
| buf->st_ino = 0; |
| buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes); |
| buf->st_nlink = 1; |
| buf->st_uid = buf->st_gid = 0; |
| #ifdef __CYGWIN_USE_BIG_TYPES__ |
| buf->st_size = ((_off64_t)fdata.nFileSizeHigh << 32) + |
| fdata.nFileSizeLow; |
| #else |
| buf->st_size = (off_t)fdata.nFileSizeLow; |
| #endif |
| buf->st_blocks = size_to_blocks(buf->st_size); |
| 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; |
| } else if (errno == ENOENT) { |
| /* |
| * In the winsymlinks mode (which is the default), Cygwin |
| * emulates symbol links using Windows shortcut files. These |
| * files are formed by adding .lnk extension. So, if we have |
| * not found the specified file name, it could be that it is |
| * a symbol link. Let's Cygwin to deal with that. |
| */ |
| return cygstat(file_name, buf); |
| } |
| return -1; |
| } |
| |
| /* We provide our own lstat/stat functions, since the provided Cygwin versions |
| * of these functions are too slow. These stat functions are tailored for Git's |
| * usage, and therefore they are not meant to be complete and correct emulation |
| * of lstat/stat functionality. |
| */ |
| static int cygwin_lstat(const char *path, struct stat *buf) |
| { |
| return do_stat(path, buf, lstat); |
| } |
| |
| static int cygwin_stat(const char *path, struct stat *buf) |
| { |
| return do_stat(path, buf, stat); |
| } |
| |
| |
| /* |
| * At start up, we are trying to determine whether Win32 API or cygwin stat |
| * functions should be used. The choice is determined by core.ignorecygwinfstricks. |
| * Reading this option is not always possible immediately as git_dir may |
| * not be set yet. So until it is set, use cygwin lstat/stat functions. |
| * However, if core.filemode is set, we must use the Cygwin posix |
| * stat/lstat as the Windows stat functions do not determine posix filemode. |
| * |
| * Note that git_cygwin_config() does NOT call git_default_config() and this |
| * is deliberate. Many commands read from config to establish initial |
| * values in variables and later tweak them from elsewhere (e.g. command line). |
| * init_stat() is called lazily on demand, typically much late in the program, |
| * and calling git_default_config() from here would break such variables. |
| */ |
| static int native_stat = 1; |
| static int core_filemode = 1; /* matches trust_executable_bit default */ |
| |
| static int git_cygwin_config(const char *var, const char *value, void *cb) |
| { |
| if (!strcmp(var, "core.ignorecygwinfstricks")) |
| native_stat = git_config_bool(var, value); |
| else if (!strcmp(var, "core.filemode")) |
| core_filemode = git_config_bool(var, value); |
| return 0; |
| } |
| |
| static int init_stat(void) |
| { |
| if (have_git_dir() && git_config(git_cygwin_config,NULL)) { |
| if (!core_filemode && native_stat) { |
| cygwin_stat_fn = cygwin_stat; |
| cygwin_lstat_fn = cygwin_lstat; |
| } else { |
| cygwin_stat_fn = stat; |
| cygwin_lstat_fn = lstat; |
| } |
| return 0; |
| } |
| return 1; |
| } |
| |
| static int cygwin_stat_stub(const char *file_name, struct stat *buf) |
| { |
| return (init_stat() ? stat : *cygwin_stat_fn)(file_name, buf); |
| } |
| |
| static int cygwin_lstat_stub(const char *file_name, struct stat *buf) |
| { |
| return (init_stat() ? lstat : *cygwin_lstat_fn)(file_name, buf); |
| } |
| |
| stat_fn_t cygwin_stat_fn = cygwin_stat_stub; |
| stat_fn_t cygwin_lstat_fn = cygwin_lstat_stub; |
| |