From 0365488ce9d1bd4305825d4ae0c5faa5fbda5b25 Mon Sep 17 00:00:00 2001
From: Andrea Mazzoleni <amadvance@users.sourceforge.net>
Date: Sat, 11 Jun 2011 10:19:34 +0200
Subject: [PATCH] Using lstat also in Windows.

---
 HISTORY |  1 +
 mingw.c | 22 +++++++++++++++++-----
 mingw.h | 11 ++++++-----
 scan.c  |  4 ++--
 4 files changed, 26 insertions(+), 12 deletions(-)

diff --git a/HISTORY b/HISTORY
index 9c578a9b..923c526c 100644
--- a/HISTORY
+++ b/HISTORY
@@ -9,6 +9,7 @@ SnapRAID HISTORY
   to remove the warning.
 * In fixing, if a file cannot be written for missing permission, an error is
   reported only if a write is effectively required.
+* Ignores any symbolic links. They are not backuped.
 
 1.3 2011/5
 ==========
diff --git a/mingw.c b/mingw.c
index d70ace4d..00776ab8 100644
--- a/mingw.c
+++ b/mingw.c
@@ -121,10 +121,16 @@ static void windows_info2stat(const BY_HANDLE_FILE_INFORMATION* info, struct win
  */
 static void windows_finddata2stat(const WIN32_FIND_DATAW* info, struct windows_stat* st)
 {
-	/* Convert special attributes to a char device */
+	/* Convert special attributes */
 	if ((info->dwFileAttributes & FILE_ATTRIBUTE_DEVICE) != 0) {
 		st->st_mode = S_IFBLK;
-	} else if ((info->dwFileAttributes & (FILE_ATTRIBUTE_SYSTEM | FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_TEMPORARY | FILE_ATTRIBUTE_OFFLINE | FILE_ATTRIBUTE_REPARSE_POINT)) != 0) {
+	} else if ((info->dwFileAttributes & (
+			FILE_ATTRIBUTE_SYSTEM /* System files */
+			| FILE_ATTRIBUTE_HIDDEN /* Hidden files */
+			| FILE_ATTRIBUTE_TEMPORARY /* Files going to be deleted on close */
+			| FILE_ATTRIBUTE_OFFLINE
+			| FILE_ATTRIBUTE_REPARSE_POINT /* Symbolic links */
+			)) != 0) {
 		st->st_mode = S_IFCHR;
 	} else if ((info->dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0) {
 		st->st_mode = S_IFDIR;
@@ -214,7 +220,7 @@ int windows_fstat(int fd, struct windows_stat* st)
 	return 0;
 }
 
-int windows_stat(const char* file, struct windows_stat* st)
+int windows_lstat(const char* file, struct windows_stat* st)
 {
 	HANDLE h;
 	WIN32_FIND_DATAW data;
@@ -245,12 +251,18 @@ int windows_mkdir(const char* file)
 	return _wmkdir(u8tou16(file));
 }
 
-int stat_inode(const char* file, struct windows_stat* st)
+int lstat_inode(const char* file, struct windows_stat* st)
 {
 	BY_HANDLE_FILE_INFORMATION info;
 	HANDLE h;
 
-	h = CreateFileW(u8tou16(file), 0, FILE_SHARE_READ | FILE_SHARE_WRITE, 0, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0);
+	/*
+	 * Open the handle of the file.
+	 *
+	 * Use FILE_FLAG_BACKUP_SEMANTICS to open directories and to override the file security checks.
+	 * Use FILE_FLAG_OPEN_REPARSE_POINT to open symbolic links and not the their target.
+	 */
+	h = CreateFileW(u8tou16(file), 0, FILE_SHARE_READ | FILE_SHARE_WRITE, 0, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OPEN_REPARSE_POINT, 0);
 	if (h == INVALID_HANDLE_VALUE) {
 		windows_errno(GetLastError());
 		return -1;
diff --git a/mingw.h b/mingw.h
index bfb1cd32..be84512e 100644
--- a/mingw.h
+++ b/mingw.h
@@ -32,6 +32,7 @@
 #define fopen windows_fopen
 #define open windows_open
 #define stat windows_stat
+#define lstat windows_lstat
 #define access windows_access
 #define off_t off64_t
 #define lseek lseek64
@@ -67,7 +68,7 @@ int windows_fstat(int fd, struct windows_stat* st);
 /**
  * Like the C stat() but without inode information.
  */
-int windows_stat(const char* file, struct windows_stat* st);
+int windows_lstat(const char* file, struct windows_stat* st);
 
 /**
  * Like the C access().
@@ -80,12 +81,12 @@ int windows_access(const char* file, int mode);
 int windows_mkdir(const char* file);
 
 /**
- * Like the C stat() with inode information.
+ * Like the C lstat() with inode information.
  * It doesn't work for all kind of files and directories. For example "\System Volume Information" cannot be opened.
- * Note that instead stat() works for all the files.
+ * Note that instead lstat() works for all the files.
  */
-#define HAVE_STAT_INODE 1
-int stat_inode(const char* file, struct windows_stat* st);
+#define HAVE_LSTAT_INODE 1
+int lstat_inode(const char* file, struct windows_stat* st);
 
 /**
  * Like the C ftruncate().
diff --git a/scan.c b/scan.c
index 7f06d06a..0cd7d1d0 100644
--- a/scan.c
+++ b/scan.c
@@ -258,9 +258,9 @@ static void scan_dir(struct snapraid_scan* scan, struct snapraid_state* state, s
 					continue;
 				}
 
-#if HAVE_STAT_INODE
+#if HAVE_LSTAT_INODE
 				/* get inode info about the file, Windows needs an additional step */
-				if (stat_inode(path_next, &st) != 0) {
+				if (lstat_inode(path_next, &st) != 0) {
 					fprintf(stderr, "Error in stat_inode file '%s'. %s.\n", path_next, strerror(errno));
 					exit(EXIT_FAILURE);
 				}