/* 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;
}
/*
* Allocate and initialize an fsentry from a FILE_FULL_DIR_INFORMATION structure.
*/
static struct fsentry *fseentry_create_entry(struct fscache *cache, struct fsentry *list,
PFILE_FULL_DIR_INFORMATION fdata)
{
char buf[MAX_PATH * 3];
int len;
struct fsentry *fse;
len = xwcstoutfn(buf, ARRAY_SIZE(buf), fdata->FileName, fdata->FileNameLength / sizeof(wchar_t));
fse = fsentry_alloc(cache, list, buf, len);
/*
* On certain Windows versions, host directories mapped into
* Windows Containers ("Volumes", see https://docs.docker.com/storage/volumes/)
* look like symbolic links, but their targets are paths that
* are valid only in kernel mode.
*
* Let's work around this by detecting that situation and
* telling Git that these are *not* symbolic links.
*/
if (fdata->FileAttributes & FILE_ATTRIBUTE_REPARSE_POINT &&
fdata->EaSize == IO_REPARSE_TAG_SYMLINK &&
sizeof(buf) > (list ? list->len + 1 : 0) + fse->len + 1 &&
is_inside_windows_container()) {
size_t off = 0;
if (list) {
memcpy(buf, list->name, list->len);
buf[list->len] = '/';
off = list->len + 1;
}
memcpy(buf + off, fse->name, fse->len);
buf[off + fse->len] = '\0';
}
fse->st_mode = file_attr_to_st_mode(fdata->FileAttributes,
fdata->EaSize, buf);
fse->st_size = S_ISLNK(fse->st_mode) ? MAX_LONG_PATH :
fdata->EndOfFile.LowPart | (((off_t)fdata->EndOfFile.HighPart) << 32);
filetime_to_timespec((FILETIME *)&(fdata->LastAccessTime), &(fse->st_atim));
filetime_to_timespec((FILETIME *)&(fdata->LastWriteTime), &(fse->st_mtim));
filetime_to_timespec((FILETIME *)&(fdata->CreationTime), &(fse->st_ctim));
return fse;
}
/*
* Allocate and initialize an fsentry from a WIN32_FIND_DATA structure.
*/
static struct fsentry *fseentry_create_entry(struct fsentry *list,
const WIN32_FIND_DATAW *fdata)
{
char buf[MAX_PATH * 3];
int len;
struct fsentry *fse;
len = xwcstoutf(buf, fdata->cFileName, ARRAY_SIZE(buf));
fse = fsentry_alloc(list, buf, len);
fse->st_mode = file_attr_to_st_mode(fdata->dwFileAttributes,
fdata->dwReserved0);
fse->st_size = S_ISLNK(fse->st_mode) ? MAX_LONG_PATH :
fdata->nFileSizeLow | (((off_t) fdata->nFileSizeHigh) << 32);
filetime_to_timespec(&(fdata->ftLastAccessTime), &(fse->st_atim));
filetime_to_timespec(&(fdata->ftLastWriteTime), &(fse->st_mtim));
filetime_to_timespec(&(fdata->ftCreationTime), &(fse->st_ctim));
return fse;
}
