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adbc0b6b DP |
1 | #define WIN32_LEAN_AND_MEAN |
2 | #include "../git-compat-util.h" | |
3 | #include "win32.h" | |
4 | #include "../cache.h" /* to read configuration */ | |
5 | ||
6 | static inline void filetime_to_timespec(const FILETIME *ft, struct timespec *ts) | |
7 | { | |
8 | long long winTime = ((long long)ft->dwHighDateTime << 32) + | |
9 | ft->dwLowDateTime; | |
10 | winTime -= 116444736000000000LL; /* Windows to Unix Epoch conversion */ | |
11 | /* convert 100-nsecond interval to seconds and nanoseconds */ | |
12 | ts->tv_sec = (time_t)(winTime/10000000); | |
13 | ts->tv_nsec = (long)(winTime - ts->tv_sec*10000000LL) * 100; | |
14 | } | |
15 | ||
16 | #define size_to_blocks(s) (((s)+511)/512) | |
17 | ||
18 | /* do_stat is a common implementation for cygwin_lstat and cygwin_stat. | |
19 | * | |
20 | * To simplify its logic, in the case of cygwin symlinks, this implementation | |
21 | * falls back to the cygwin version of stat/lstat, which is provided as the | |
22 | * last argument. | |
23 | */ | |
24 | static int do_stat(const char *file_name, struct stat *buf, stat_fn_t cygstat) | |
25 | { | |
26 | WIN32_FILE_ATTRIBUTE_DATA fdata; | |
27 | ||
28 | if (file_name[0] == '/') | |
29 | return cygstat (file_name, buf); | |
30 | ||
31 | if (!(errno = get_file_attr(file_name, &fdata))) { | |
32 | /* | |
33 | * If the system attribute is set and it is not a directory then | |
34 | * it could be a symbol link created in the nowinsymlinks mode. | |
35 | * Normally, Cygwin works in the winsymlinks mode, so this situation | |
36 | * is very unlikely. For the sake of simplicity of our code, let's | |
37 | * Cygwin to handle it. | |
38 | */ | |
39 | if ((fdata.dwFileAttributes & FILE_ATTRIBUTE_SYSTEM) && | |
40 | !(fdata.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)) | |
41 | return cygstat(file_name, buf); | |
42 | ||
43 | /* fill out the stat structure */ | |
44 | buf->st_dev = buf->st_rdev = 0; /* not used by Git */ | |
45 | buf->st_ino = 0; | |
46 | buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes); | |
47 | buf->st_nlink = 1; | |
48 | buf->st_uid = buf->st_gid = 0; | |
49 | #ifdef __CYGWIN_USE_BIG_TYPES__ | |
50 | buf->st_size = ((_off64_t)fdata.nFileSizeHigh << 32) + | |
51 | fdata.nFileSizeLow; | |
52 | #else | |
53 | buf->st_size = (off_t)fdata.nFileSizeLow; | |
54 | #endif | |
55 | buf->st_blocks = size_to_blocks(buf->st_size); | |
56 | filetime_to_timespec(&fdata.ftLastAccessTime, &buf->st_atim); | |
57 | filetime_to_timespec(&fdata.ftLastWriteTime, &buf->st_mtim); | |
58 | filetime_to_timespec(&fdata.ftCreationTime, &buf->st_ctim); | |
59 | return 0; | |
60 | } else if (errno == ENOENT) { | |
61 | /* | |
62 | * In the winsymlinks mode (which is the default), Cygwin | |
63 | * emulates symbol links using Windows shortcut files. These | |
64 | * files are formed by adding .lnk extension. So, if we have | |
65 | * not found the specified file name, it could be that it is | |
66 | * a symbol link. Let's Cygwin to deal with that. | |
67 | */ | |
68 | return cygstat(file_name, buf); | |
69 | } | |
70 | return -1; | |
71 | } | |
72 | ||
73 | /* We provide our own lstat/stat functions, since the provided Cygwin versions | |
74 | * of these functions are too slow. These stat functions are tailored for Git's | |
75 | * usage, and therefore they are not meant to be complete and correct emulation | |
76 | * of lstat/stat functionality. | |
77 | */ | |
78 | static int cygwin_lstat(const char *path, struct stat *buf) | |
79 | { | |
80 | return do_stat(path, buf, lstat); | |
81 | } | |
82 | ||
83 | static int cygwin_stat(const char *path, struct stat *buf) | |
84 | { | |
85 | return do_stat(path, buf, stat); | |
86 | } | |
87 | ||
88 | ||
89 | /* | |
90 | * At start up, we are trying to determine whether Win32 API or cygwin stat | |
91 | * functions should be used. The choice is determined by core.ignorecygwinfstricks. | |
b18cc5a3 | 92 | * Reading this option is not always possible immediately as git_dir may |
adbc0b6b | 93 | * not be set yet. So until it is set, use cygwin lstat/stat functions. |
79748439 | 94 | * However, if core.filemode is set, we must use the Cygwin posix |
3ea3c215 | 95 | * stat/lstat as the Windows stat functions do not determine posix filemode. |
79748439 JH |
96 | * |
97 | * Note that git_cygwin_config() does NOT call git_default_config() and this | |
98 | * is deliberate. Many commands read from config to establish initial | |
99 | * values in variables and later tweak them from elsewhere (e.g. command line). | |
100 | * init_stat() is called lazily on demand, typically much late in the program, | |
101 | * and calling git_default_config() from here would break such variables. | |
adbc0b6b DP |
102 | */ |
103 | static int native_stat = 1; | |
79748439 | 104 | static int core_filemode; |
adbc0b6b DP |
105 | |
106 | static int git_cygwin_config(const char *var, const char *value, void *cb) | |
107 | { | |
79748439 | 108 | if (!strcmp(var, "core.ignorecygwinfstricks")) |
adbc0b6b | 109 | native_stat = git_config_bool(var, value); |
79748439 JH |
110 | else if (!strcmp(var, "core.filemode")) |
111 | core_filemode = git_config_bool(var, value); | |
112 | return 0; | |
adbc0b6b DP |
113 | } |
114 | ||
115 | static int init_stat(void) | |
116 | { | |
117 | if (have_git_dir()) { | |
118 | git_config(git_cygwin_config, NULL); | |
79748439 | 119 | if (!core_filemode && native_stat) { |
7faee6b8 ML |
120 | cygwin_stat_fn = cygwin_stat; |
121 | cygwin_lstat_fn = cygwin_lstat; | |
122 | } else { | |
123 | cygwin_stat_fn = stat; | |
124 | cygwin_lstat_fn = lstat; | |
125 | } | |
adbc0b6b DP |
126 | return 0; |
127 | } | |
128 | return 1; | |
129 | } | |
130 | ||
131 | static int cygwin_stat_stub(const char *file_name, struct stat *buf) | |
132 | { | |
133 | return (init_stat() ? stat : *cygwin_stat_fn)(file_name, buf); | |
134 | } | |
135 | ||
136 | static int cygwin_lstat_stub(const char *file_name, struct stat *buf) | |
137 | { | |
138 | return (init_stat() ? lstat : *cygwin_lstat_fn)(file_name, buf); | |
139 | } | |
140 | ||
141 | stat_fn_t cygwin_stat_fn = cygwin_stat_stub; | |
142 | stat_fn_t cygwin_lstat_fn = cygwin_lstat_stub; | |
143 |