fix test failures on linux

Author: blurrycat

build.zig

@@ -387,6 +387,29 @@ pub fn build(b: *std.Build) !void {
         examples_step.dependOn(&example_run.step);
     }
 
+    // @Todo: is there a better way to do this? this feels hacky
+    //
+    // Fix the test fixture file permissions. This is necessary because Zig does
+    // not respect the execute permission on files it extracts from dependencies.
+    // Since we need those files to have the execute permission set for tests to
+    // run successfully, we need to patch them before we bake them into the
+    // test executable.
+    {
+        const file_paths = &[_]std.Build.LazyPath{
+            libgit_root.path(b, "tests/resources/filemodes/exec_on"),
+            libgit_root.path(b, "tests/resources/filemodes/exec_off2on_staged"),
+            libgit_root.path(b, "tests/resources/filemodes/exec_off2on_workdir"),
+            libgit_root.path(b, "tests/resources/filemodes/exec_on_untracked"),
+        };
+        for (file_paths) |lazy| {
+            const path = lazy.getPath2(b, null);
+            const file = try std.fs.cwd().openFile(path, .{
+                .mode = .read_write,
+            });
+            try file.setPermissions(.{ .inner = .{ .mode = 0o755 } });
+        }
+    }
+
     const test_step = b.step("test", "Run core unit tests (requires python)");
     {
         const gen_cmd = b.addSystemCommand(&.{"python"});