thodg/libgit2

diff --git a/src/checkout.c b/src/checkout.c
index de48c9e..8c06b33 100644
--- a/src/checkout.c
+++ b/src/checkout.c
@@ -243,6 +243,12 @@ static int checkout_action_common(
 		if (delta->new_file.mode == GIT_FILEMODE_LINK && wd != NULL)
 			*action |= CHECKOUT_ACTION__REMOVE;
 
+		/* if the file is on disk and doesn't match our mode, force update */
+		if (wd &&
+			GIT_PERMS_IS_EXEC(wd->mode) !=
+			GIT_PERMS_IS_EXEC(delta->new_file.mode))
+				*action |= CHECKOUT_ACTION__REMOVE;
+
 		notify = GIT_CHECKOUT_NOTIFY_UPDATED;
 	}
 
@@ -1500,15 +1506,6 @@ static int blob_content_to_file(
 	if (error < 0)
 		return error;
 
-	if (GIT_PERMS_IS_EXEC(mode)) {
-		data->perfdata.chmod_calls++;
-
-		if ((error = p_chmod(path, mode)) < 0) {
-			giterr_set(GITERR_OS, "Failed to set permissions on '%s'", path);
-			return error;
-		}
-	}
-
 	if (st) {
 		data->perfdata.stat_calls++;
 
diff --git a/tests/checkout/tree.c b/tests/checkout/tree.c
index be40198..5680b86 100644
--- a/tests/checkout/tree.c
+++ b/tests/checkout/tree.c
@@ -946,7 +946,7 @@ void test_checkout_tree__filemode_preserved_in_index(void)
 
 	cl_git_pass(git_checkout_tree(g_repo, (const git_object *)commit, &opts));
 	cl_assert(entry = git_index_get_bypath(index, "executable.txt", 0));
-	cl_assert_equal_i(0100755, entry->mode);
+	cl_assert(GIT_PERMS_IS_EXEC(entry->mode));
 
 	git_commit_free(commit);
 
@@ -957,7 +957,7 @@ void test_checkout_tree__filemode_preserved_in_index(void)
 
 	cl_git_pass(git_checkout_tree(g_repo, (const git_object *)commit, &opts));
 	cl_assert(entry = git_index_get_bypath(index, "a/b.txt", 0));
-	cl_assert_equal_i(0100644, entry->mode);
+	cl_assert(!GIT_PERMS_IS_EXEC(entry->mode));
 
 	git_commit_free(commit);
 
@@ -968,7 +968,18 @@ void test_checkout_tree__filemode_preserved_in_index(void)
 
 	cl_git_pass(git_checkout_tree(g_repo, (const git_object *)commit, &opts));
 	cl_assert(entry = git_index_get_bypath(index, "a/b.txt", 0));
-	cl_assert_equal_i(0100755, entry->mode);
+	cl_assert(GIT_PERMS_IS_EXEC(entry->mode));
+
+	git_commit_free(commit);
+
+
+	/* Finally, check out the text file again and check that the exec bit is cleared */
+	cl_git_pass(git_oid_fromstr(&executable_oid, "cf80f8de9f1185bf3a05f993f6121880dd0cfbc9"));
+	cl_git_pass(git_commit_lookup(&commit, g_repo, &executable_oid));
+
+	cl_git_pass(git_checkout_tree(g_repo, (const git_object *)commit, &opts));
+	cl_assert(entry = git_index_get_bypath(index, "a/b.txt", 0));
+	cl_assert(!GIT_PERMS_IS_EXEC(entry->mode));
 
 	git_commit_free(commit);
 
@@ -976,6 +987,73 @@ void test_checkout_tree__filemode_preserved_in_index(void)
 	git_index_free(index);
 }
 
+mode_t read_filemode(const char *path)
+{
+	git_buf fullpath = GIT_BUF_INIT;
+	struct stat st;
+	mode_t result;
+
+	git_buf_joinpath(&fullpath, "testrepo", path);
+	cl_must_pass(p_stat(fullpath.ptr, &st));
+
+	result = GIT_PERMS_IS_EXEC(st.st_mode) ?
+		GIT_FILEMODE_BLOB_EXECUTABLE : GIT_FILEMODE_BLOB;
+
+	git_buf_free(&fullpath);
+
+	return result;
+}
+
+void test_checkout_tree__filemode_preserved_in_workdir(void)
+{
+#ifndef GIT_WIN32
+	git_oid executable_oid;
+	git_commit *commit;
+	git_checkout_options opts = GIT_CHECKOUT_OPTIONS_INIT;
+
+	opts.checkout_strategy = GIT_CHECKOUT_FORCE;
+
+	/* test a freshly added executable */
+	cl_git_pass(git_oid_fromstr(&executable_oid, "afe4393b2b2a965f06acf2ca9658eaa01e0cd6b6"));
+	cl_git_pass(git_commit_lookup(&commit, g_repo, &executable_oid));
+
+	cl_git_pass(git_checkout_tree(g_repo, (const git_object *)commit, &opts));
+	cl_assert(GIT_PERMS_IS_EXEC(read_filemode("executable.txt")));
+
+	git_commit_free(commit);
+
+
+	/* Now start with a commit which has a text file */
+	cl_git_pass(git_oid_fromstr(&executable_oid, "cf80f8de9f1185bf3a05f993f6121880dd0cfbc9"));
+	cl_git_pass(git_commit_lookup(&commit, g_repo, &executable_oid));
+
+	cl_git_pass(git_checkout_tree(g_repo, (const git_object *)commit, &opts));
+	cl_assert(!GIT_PERMS_IS_EXEC(read_filemode("a/b.txt")));
+
+	git_commit_free(commit);
+
+
+	/* And then check out to a commit which converts the text file to an executable */
+	cl_git_pass(git_oid_fromstr(&executable_oid, "144344043ba4d4a405da03de3844aa829ae8be0e"));
+	cl_git_pass(git_commit_lookup(&commit, g_repo, &executable_oid));
+
+	cl_git_pass(git_checkout_tree(g_repo, (const git_object *)commit, &opts));
+	cl_assert(GIT_PERMS_IS_EXEC(read_filemode("a/b.txt")));
+
+	git_commit_free(commit);
+
+
+	/* Finally, check out the text file again and check that the exec bit is cleared */
+	cl_git_pass(git_oid_fromstr(&executable_oid, "cf80f8de9f1185bf3a05f993f6121880dd0cfbc9"));
+	cl_git_pass(git_commit_lookup(&commit, g_repo, &executable_oid));
+
+	cl_git_pass(git_checkout_tree(g_repo, (const git_object *)commit, &opts));
+	cl_assert(!GIT_PERMS_IS_EXEC(read_filemode("a/b.txt")));
+
+	git_commit_free(commit);
+#endif
+}
+
 void test_checkout_tree__removes_conflicts(void)
 {
 	git_oid commit_id;