global/git
1
0
Fork 0
mirror of https://github.com/git/git.git synced 2026-01-19 15:09:01 +00:00
Code Issues Packages Projects Releases Wiki Activity

Win32: implement stat() with symlink support

Browse Source 
With respect to symlinks, the current stat() implementation is almost the
same as lstat(): except for the file type (st_mode & S_IFMT), it returns
information about the link rather than the target.

Implement stat by opening the file with as little permissions as possible
and calling GetFileInformationByHandle on it. This way, all link resoltion
is handled by the Windows file system layer.

If symlinks are disabled, use lstat() as before, but fail with ELOOP if a
symlink would have to be resolved.

Signed-off-by: Karsten Blees <blees@dcon.de>
This commit is contained in:
Karsten Blees
2015-05-16 01:18:14 +02:00
committed by Jameson Miller
parent daff13a0e2
commit 76d630d0ca
1 changed files with 48 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

64
compat/mingw.c
View File

@@ -723,16 +723,60 @@ int mingw_lstat(const char *file_name, struct stat *buf)
{
return do_lstat(0, file_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_dev = buf->st_rdev = 0; /* not used by Git */
buf->st_gid = 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_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
return 0;
}
int mingw_stat(const char *file_name, struct stat *buf)
{
return do_lstat(1, file_name, buf);
wchar_t wfile_name[MAX_LONG_PATH];
HANDLE hnd;
int result;
/* if symlinks are disabled, use lstat() (without following links) */
if (!has_symlinks) {
result = lstat(file_name, buf);
if (!result && S_ISLNK(buf->st_mode)) {
errno = ELOOP;
return -1;
}
return result;
}
/* otherwise just open the file and let Windows resolve the links */
if (xutftowcs_long_path(wfile_name, file_name) < 0)
return -1;
hnd = CreateFileW(wfile_name, 0,
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, NULL,
OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
if (hnd == INVALID_HANDLE_VALUE) {
errno = err_win_to_posix(GetLastError());
return -1;
}
result = get_file_info_by_handle(hnd, buf);
CloseHandle(hnd);
return result;
}
int mingw_fstat(int fd, struct stat *buf)
{
HANDLE fh = (HANDLE)_get_osfhandle(fd);
BY_HANDLE_FILE_INFORMATION fdata;
if (fh == INVALID_HANDLE_VALUE) {
errno = EBADF;
return -1;
@@ -741,20 +785,8 @@ int mingw_fstat(int fd, struct stat *buf)
if (GetFileType(fh) != FILE_TYPE_DISK)
return _fstati64(fd, buf);
if (GetFileInformationByHandle(fh, &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 */
buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
if (!get_file_info_by_handle(fh, buf))
return 0;
}
errno = EBADF;
return -1;
}