1#define WIN32_LEAN_AND_MEAN 2#ifdef CYGWIN_V15_WIN32API 3#include "../git-compat-util.h" 4#include "win32.h" 5#else 6#include <sys/stat.h> 7#include <sys/errno.h> 8#include "win32.h" 9#include "../git-compat-util.h" 10#endif 11#include "../cache.h" /* to read configuration */ 12 13static inline void filetime_to_timespec(const FILETIME *ft, struct timespec *ts) 14{ 15 long long winTime = ((long long)ft->dwHighDateTime << 32) + 16 ft->dwLowDateTime; 17 winTime -= 116444736000000000LL; /* Windows to Unix Epoch conversion */ 18 /* convert 100-nsecond interval to seconds and nanoseconds */ 19 ts->tv_sec = (time_t)(winTime/10000000); 20 ts->tv_nsec = (long)(winTime - ts->tv_sec*10000000LL) * 100; 21} 22 23#define size_to_blocks(s) (((s)+511)/512) 24 25/* do_stat is a common implementation for cygwin_lstat and cygwin_stat. 26 * 27 * To simplify its logic, in the case of cygwin symlinks, this implementation 28 * falls back to the cygwin version of stat/lstat, which is provided as the 29 * last argument. 30 */ 31static int do_stat(const char *file_name, struct stat *buf, stat_fn_t cygstat) 32{ 33 WIN32_FILE_ATTRIBUTE_DATA fdata; 34 35 if (file_name[0] == '/') 36 return cygstat (file_name, buf); 37 38 if (!(errno = get_file_attr(file_name, &fdata))) { 39 /* 40 * If the system attribute is set and it is not a directory then 41 * it could be a symbol link created in the nowinsymlinks mode. 42 * Normally, Cygwin works in the winsymlinks mode, so this situation 43 * is very unlikely. For the sake of simplicity of our code, let's 44 * Cygwin to handle it. 45 */ 46 if ((fdata.dwFileAttributes & FILE_ATTRIBUTE_SYSTEM) && 47 !(fdata.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)) 48 return cygstat(file_name, buf); 49 50 /* fill out the stat structure */ 51 buf->st_dev = buf->st_rdev = 0; /* not used by Git */ 52 buf->st_ino = 0; 53 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes); 54 buf->st_nlink = 1; 55 buf->st_uid = buf->st_gid = 0; 56#ifdef __CYGWIN_USE_BIG_TYPES__ 57 buf->st_size = ((_off64_t)fdata.nFileSizeHigh << 32) + 58 fdata.nFileSizeLow; 59#else 60 buf->st_size = (off_t)fdata.nFileSizeLow; 61#endif 62 buf->st_blocks = size_to_blocks(buf->st_size); 63 filetime_to_timespec(&fdata.ftLastAccessTime, &buf->st_atim); 64 filetime_to_timespec(&fdata.ftLastWriteTime, &buf->st_mtim); 65 filetime_to_timespec(&fdata.ftCreationTime, &buf->st_ctim); 66 return 0; 67 } else if (errno == ENOENT) { 68 /* 69 * In the winsymlinks mode (which is the default), Cygwin 70 * emulates symbol links using Windows shortcut files. These 71 * files are formed by adding .lnk extension. So, if we have 72 * not found the specified file name, it could be that it is 73 * a symbol link. Let's Cygwin to deal with that. 74 */ 75 return cygstat(file_name, buf); 76 } 77 return -1; 78} 79 80/* We provide our own lstat/stat functions, since the provided Cygwin versions 81 * of these functions are too slow. These stat functions are tailored for Git's 82 * usage, and therefore they are not meant to be complete and correct emulation 83 * of lstat/stat functionality. 84 */ 85static int cygwin_lstat(const char *path, struct stat *buf) 86{ 87 return do_stat(path, buf, lstat); 88} 89 90static int cygwin_stat(const char *path, struct stat *buf) 91{ 92 return do_stat(path, buf, stat); 93} 94 95 96/* 97 * At start up, we are trying to determine whether Win32 API or cygwin stat 98 * functions should be used. The choice is determined by core.ignorecygwinfstricks. 99 * Reading this option is not always possible immediately as git_dir may 100 * not be set yet. So until it is set, use cygwin lstat/stat functions. 101 * However, if core.filemode is set, we must use the Cygwin posix 102 * stat/lstat as the Windows stat functions do not determine posix filemode. 103 * 104 * Note that git_cygwin_config() does NOT call git_default_config() and this 105 * is deliberate. Many commands read from config to establish initial 106 * values in variables and later tweak them from elsewhere (e.g. command line). 107 * init_stat() is called lazily on demand, typically much late in the program, 108 * and calling git_default_config() from here would break such variables. 109 */ 110static int native_stat = 1; 111static int core_filemode = 1; /* matches trust_executable_bit default */ 112 113static int git_cygwin_config(const char *var, const char *value, void *cb) 114{ 115 if (!strcmp(var, "core.ignorecygwinfstricks")) 116 native_stat = git_config_bool(var, value); 117 else if (!strcmp(var, "core.filemode")) 118 core_filemode = git_config_bool(var, value); 119 return 0; 120} 121 122static int init_stat(void) 123{ 124 if (have_git_dir() && git_config(git_cygwin_config,NULL)) { 125 if (!core_filemode && native_stat) { 126 cygwin_stat_fn = cygwin_stat; 127 cygwin_lstat_fn = cygwin_lstat; 128 } else { 129 cygwin_stat_fn = stat; 130 cygwin_lstat_fn = lstat; 131 } 132 return 0; 133 } 134 return 1; 135} 136 137static int cygwin_stat_stub(const char *file_name, struct stat *buf) 138{ 139 return (init_stat() ? stat : *cygwin_stat_fn)(file_name, buf); 140} 141 142static int cygwin_lstat_stub(const char *file_name, struct stat *buf) 143{ 144 return (init_stat() ? lstat : *cygwin_lstat_fn)(file_name, buf); 145} 146 147stat_fn_t cygwin_stat_fn = cygwin_stat_stub; 148stat_fn_t cygwin_lstat_fn = cygwin_lstat_stub; 149