Merge pull request 'adjust temp files' (#350) from i348 into main

Reviewed-on: https://codeberg.org/ziglings/exercises/pulls/350

README.md

@@ -38,7 +38,8 @@ is incredibly friendly and helpful!
 
 Install a [development build](https://ziglang.org/download/) of
 the Zig compiler.  (See the "master" section of the downloads
-page.)
+page.) Sometimes the latest build is not available there;
+in that case, you can download it directly from the [build directory](https://ziglang.org/download/index.json).
 
 Verify the installation and build number of `zig` like so:
 
@@ -86,6 +87,7 @@ that if you update one, you may need to also update the other.
 
 ### Version Changes
 
+* 2026-01-07 zig 0.16.0-dev.2040 - adjust temp files, see [#30683](https://codeberg.org/ziglang/zig/pulls/30683)
 * 2026-01-06 zig 0.16.0-dev.1976 - move process API to `std.Io` and changes to main/environ/argv, see [#30644](https://codeberg.org/ziglang/zig/pulls/30644)
 * *2025-12-28* zig 0.16.0-dev.1859 - file system I/O integrated with the std.Io interface, see [#30232](https://codeberg.org/ziglang/zig/pulls/30232)
 * *2025-11-01* zig 0.16.0-dev.1204 - more changes due to new I/O API, see [#25592](https://github.com/ziglang/zig/pull/25592)

build.zig

@@ -15,7 +15,7 @@ const print = std.debug.print;
 //     1) Getting Started
 //     2) Version Changes
 comptime {
-    const required_zig = "0.16.0-dev.1976";
+    const required_zig = "0.16.0-dev.2040";
     const current_zig = builtin.zig_version;
     const min_zig = std.SemanticVersion.parse(required_zig) catch unreachable;
     if (current_zig.order(min_zig) == .lt) {

test/tests.zig

@@ -21,9 +21,10 @@ pub fn addCliTests(b: *std.Build, exercises: []const Exercise) *Step {
         // Test that `zig build -Dhealed -Dn=n` selects the nth exercise.
         const case_step = createCase(b, "case-1");
 
-        const tmp_path = makeTempPath(b) catch |err| {
+        const tmp_path = createTempPath(b) catch |err| {
             return fail(step, "unable to make tmp path: {s}\n", .{@errorName(err)});
         };
+        defer deleteTmpPath(b, tmp_path);
 
         const heal_step = HealStep.create(b, exercises, tmp_path);
 
@@ -47,20 +48,16 @@ pub fn addCliTests(b: *std.Build, exercises: []const Exercise) *Step {
 
             case_step.dependOn(&verify.step);
         }
-
-        const cleanup = b.addRemoveDirTree(.{ .src_path = .{ .owner = b, .sub_path = tmp_path } });
-        cleanup.step.dependOn(case_step);
-
-        step.dependOn(&cleanup.step);
     }
 
     {
         // Test that `zig build -Dhealed` processes all the exercises in order.
         const case_step = createCase(b, "case-2");
 
-        const tmp_path = makeTempPath(b) catch |err| {
+        const tmp_path = createTempPath(b) catch |err| {
             return fail(step, "unable to make tmp path: {s}\n", .{@errorName(err)});
         };
+        defer deleteTmpPath(b, tmp_path);
 
         const heal_step = HealStep.create(b, exercises, tmp_path);
         heal_step.step.dependOn(case_step);
@@ -79,11 +76,6 @@ pub fn addCliTests(b: *std.Build, exercises: []const Exercise) *Step {
         const stderr = cmd.captureStdErr(.{});
         const verify = CheckStep.create(b, exercises, stderr);
         verify.step.dependOn(&cmd.step);
-
-        const cleanup = b.addRemoveDirTree(.{ .src_path = .{ .owner = b, .sub_path = tmp_path } });
-        cleanup.step.dependOn(&verify.step);
-
-        step.dependOn(&cleanup.step);
     }
 
     {
@@ -400,9 +392,7 @@ fn heal(allocator: Allocator, exercises: []const Exercise, work_path: []const u8
     }
 }
 
-/// This function is the same as the one in std.Build.makeTempPath, with the
+fn createTempPath(b: *Build) ![]const u8 {
-/// difference that returns an error when the temp path cannot be created.
-pub fn makeTempPath(b: *Build) ![]const u8 {
     const io = b.graph.io;
     const rand_int = std.crypto.random.int(u64);
     const tmp_dir_sub_path = "tmp" ++ std.Io.Dir.path.sep_str ++ std.fmt.hex(rand_int);
@@ -410,3 +400,10 @@ pub fn makeTempPath(b: *Build) ![]const u8 {
     try b.cache_root.handle.createDirPath(io, tmp_dir_sub_path);
     return result_path;
 }
+
+fn deleteTmpPath(b: *Build, path: []const u8) void {
+    const io = b.graph.io;
+    std.Io.Dir.cwd().deleteTree(io, path) catch |err| {
+        std.log.warn("failed to delete {s}: {t}", .{ path, err });
+    };
+}