mingw: let lstat() fail with errno == ENOTDIR when appropriate

diff --git a/compat/mingw.c b/compat/mingw.c
index 717931e35920c3546df9f68148cbe20050d3f004..545e952a588bd536a4cd462d0a95ed0d778f4901 100644 (file)
--- a/compat/mingw.c
+++ b/compat/mingw.c
@@ -454,6 +454,39 @@ static inline time_t filetime_to_time_t(const FILETIME *ft)
        return (time_t)(filetime_to_hnsec(ft) / 10000000);
 }
 
+/**
+ * Verifies that safe_create_leading_directories() would succeed.
+ */
+static int has_valid_directory_prefix(wchar_t *wfilename)
+{
+       int n = wcslen(wfilename);
+
+       while (n > 0) {
+               wchar_t c = wfilename[--n];
+               DWORD attributes;
+
+               if (!is_dir_sep(c))
+                       continue;
+
+               wfilename[n] = L'\0';
+               attributes = GetFileAttributesW(wfilename);
+               wfilename[n] = c;
+               if (attributes == FILE_ATTRIBUTE_DIRECTORY ||
+                               attributes == FILE_ATTRIBUTE_DEVICE)
+                       return 1;
+               if (attributes == INVALID_FILE_ATTRIBUTES)
+                       switch (GetLastError()) {
+                       case ERROR_PATH_NOT_FOUND:
+                               continue;
+                       case ERROR_FILE_NOT_FOUND:
+                               /* This implies parent directory exists. */
+                               return 1;
+                       }
+               return 0;
+       }
+       return 1;
+}
+
 /* We keep the do_lstat code in a separate function to avoid recursion.
  * When a path ends with a slash, the stat will fail with ENOENT. In
  * this case, we strip the trailing slashes and stat again.
@@ -514,6 +547,12 @@ static int do_lstat(int follow, const char *file_name, struct stat *buf)
        case ERROR_NOT_ENOUGH_MEMORY:
                errno = ENOMEM;
                break;
+       case ERROR_PATH_NOT_FOUND:
+               if (!has_valid_directory_prefix(wfilename)) {
+                       errno = ENOTDIR;
+                       break;
+               }
+               /* fallthru */
        default:
                errno = ENOENT;
                break;
@@ -1603,7 +1642,12 @@ int mingw_rename(const char *pold, const char *pnew)
        if (gle == ERROR_ACCESS_DENIED &&
            (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
                if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
-                       errno = EISDIR;
+                       DWORD attrsold = GetFileAttributesW(wpold);
+                       if (attrsold == INVALID_FILE_ATTRIBUTES ||
+                           !(attrsold & FILE_ATTRIBUTE_DIRECTORY))
+                               errno = EISDIR;
+                       else if (!_wrmdir(wpnew))
+                               goto repeat;
                        return -1;
                }
                if ((attrs & FILE_ATTRIBUTE_READONLY) &&