Merge branch 'js/mingw-loosen-overstrict-tree-entry-checks' into next

An earlier update to Git for Windows declared that a tree object is
invalid if it has a path component with backslash in it, which was
overly strict, which has been corrected.  The only protection the
Windows users need is to prevent such path (or any path that their
filesystem cannot check out) from entering the index.

* js/mingw-loosen-overstrict-tree-entry-checks:
  mingw: only test index entries for backslashes, not tree entries

Author: gitster

read-cache.c

@@ -1278,6 +1278,11 @@ static int add_index_entry_with_check(struct index_state *istate, struct cache_e
 	int skip_df_check = option & ADD_CACHE_SKIP_DFCHECK;
 	int new_only = option & ADD_CACHE_NEW_ONLY;
 
+#ifdef GIT_WINDOWS_NATIVE
+	if (protect_ntfs && strchr(ce->name, '\\'))
+		return error(_("filename in tree entry contains backslash: '%s'"), ce->name);
+#endif
+
 	if (!(option & ADD_CACHE_KEEP_CACHE_TREE))
 		cache_tree_invalidate_path(istate, ce->name);
 

t/t7415-submodule-names.sh

@@ -207,16 +207,17 @@ test_expect_success MINGW 'prevent git~1 squatting on Windows' '
 			git hash-object -w --stdin)" &&
 		rev="$(git rev-parse --verify HEAD)" &&
 		hash="$(echo x | git hash-object -w --stdin)" &&
+		test_must_fail git update-index --add \
+			--cacheinfo 160000,$rev,d\\a 2>err &&
+		test_i18ngrep backslash err &&
 		git -c core.protectNTFS=false update-index --add \
 			--cacheinfo 100644,$modules,.gitmodules \
 			--cacheinfo 160000,$rev,c \
 			--cacheinfo 160000,$rev,d\\a \
 			--cacheinfo 100644,$hash,d./a/x \
 			--cacheinfo 100644,$hash,d./a/..git &&
 		test_tick &&
-		git -c core.protectNTFS=false commit -m "module" &&
-		test_must_fail git show HEAD: 2>err &&
-		test_i18ngrep backslash err
+		git -c core.protectNTFS=false commit -m "module"
 	) &&
 	test_must_fail git -c core.protectNTFS=false \
 		clone --recurse-submodules squatting squatting-clone 2>err &&

tree-walk.c

@@ -43,12 +43,6 @@ static int decode_tree_entry(struct tree_desc *desc, const char *buf, unsigned l
 		strbuf_addstr(err, _("empty filename in tree entry"));
 		return -1;
 	}
-#ifdef GIT_WINDOWS_NATIVE
-	if (protect_ntfs && strchr(path, '\\')) {
-		strbuf_addf(err, _("filename in tree entry contains backslash: '%s'"), path);
-		return -1;
-	}
-#endif
 	len = strlen(path) + 1;
 
 	/* Initialize the descriptor entry */