[PATCH 05/18] mingw: teach dirent about symlinks

["Karsten Blees via GitGitGadget" <gitgitgadget@gmail.com>]

From: Karsten Blees <blees@dcon.de>

Move the `S_IFLNK` detection to `file_attr_to_st_mode()`.

Implement `DT_LNK` detection in dirent.c's `readdir()` function.

Signed-off-by: Karsten Blees <blees@dcon.de>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 compat/mingw.c        | 13 +++----------
 compat/win32.h        |  6 ++++--
 compat/win32/dirent.c |  5 ++++-
 3 files changed, 11 insertions(+), 13 deletions(-)

diff --git a/compat/mingw.c b/compat/mingw.c
index 23a926c7d1..a3a48db581 100644
--- a/compat/mingw.c
+++ b/compat/mingw.c
@@ -946,21 +946,14 @@ int mingw_lstat(const char *file_name, struct stat *buf)
 		buf->st_gid = 0;
 		buf->st_uid = 0;
 		buf->st_nlink = 1;
-		buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
+		buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes,
+				findbuf.dwReserved0);
 		buf->st_size = fdata.nFileSizeLow |
 			(((off_t)fdata.nFileSizeHigh)<<32);
 		buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 		filetime_to_timespec(&(fdata.ftLastAccessTime), &(buf->st_atim));
 		filetime_to_timespec(&(fdata.ftLastWriteTime), &(buf->st_mtim));
 		filetime_to_timespec(&(fdata.ftCreationTime), &(buf->st_ctim));
-		if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
-			if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
-					(findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
-				buf->st_mode = S_IFLNK | S_IREAD;
-				if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
-					buf->st_mode |= S_IWRITE;
-			}
-		}
 		return 0;
 	}
 error:
@@ -1003,7 +996,7 @@ static int get_file_info_by_handle(HANDLE hnd, struct stat *buf)
 	buf->st_gid = 0;
 	buf->st_uid = 0;
 	buf->st_nlink = 1;
-	buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
+	buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes, 0);
 	buf->st_size = fdata.nFileSizeLow |
 		(((off_t)fdata.nFileSizeHigh)<<32);
 	buf->st_dev = buf->st_rdev = 0; /* not used by Git */
diff --git a/compat/win32.h b/compat/win32.h
index a97e880757..671bcc81f9 100644
--- a/compat/win32.h
+++ b/compat/win32.h
@@ -6,10 +6,12 @@
 #include <windows.h>
 #endif
 
-static inline int file_attr_to_st_mode (DWORD attr)
+static inline int file_attr_to_st_mode (DWORD attr, DWORD tag)
 {
 	int fMode = S_IREAD;
-	if (attr & FILE_ATTRIBUTE_DIRECTORY)
+	if ((attr & FILE_ATTRIBUTE_REPARSE_POINT) && tag == IO_REPARSE_TAG_SYMLINK)
+		fMode |= S_IFLNK;
+	else if (attr & FILE_ATTRIBUTE_DIRECTORY)
 		fMode |= S_IFDIR;
 	else
 		fMode |= S_IFREG;
diff --git a/compat/win32/dirent.c b/compat/win32/dirent.c
index 52420ec7d4..24ee9b814d 100644
--- a/compat/win32/dirent.c
+++ b/compat/win32/dirent.c
@@ -12,7 +12,10 @@ static inline void finddata2dirent(struct dirent *ent, WIN32_FIND_DATAW *fdata)
 	xwcstoutf(ent->d_name, fdata->cFileName, sizeof(ent->d_name));
 
 	/* Set file type, based on WIN32_FIND_DATA */
-	if (fdata->dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
+	if ((fdata->dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT)
+			&& fdata->dwReserved0 == IO_REPARSE_TAG_SYMLINK)
+		ent->d_type = DT_LNK;
+	else if (fdata->dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
 		ent->d_type = DT_DIR;
 	else
 		ent->d_type = DT_REG;
-- 
gitgitgadget