build: fix script installation

setup/installers.zig

@@ -12,7 +12,53 @@ pub fn addScript(b: *std.Build, opts: Options, src: []const u8, dest: []const u8
 
 pub fn addZBuild(b: *std.Build, opts: Options, args: anytype, dep: []const u8) void {
     if (opts.isBlacklisted(dep)) return;
-    for (b.dependency(dep, args).builder.install_tls.step.dependencies.items) |d| {
-        b.installArtifact((d.cast(std.Build.Step.InstallArtifact) orelse continue).artifact);
-    }
+    const dependency = b.dependency(dep, args);
+    b.getInstallStep().dependOn(&InstallDepStep.init(b, dependency).step);
 }
+
+pub const InstallDepStep = struct {
+    step: std.Build.Step,
+    dep: *std.Build.Dependency,
+
+    pub fn init(b: *std.Build, dep: *std.Build.Dependency) *InstallDepStep {
+        const self = b.allocator.create(InstallDepStep) catch @panic("OOM");
+        self.* = .{
+            .step = std.Build.Step.init(.{
+                .owner = b,
+                .id = .custom,
+                .name = "install-dep",
+                .makeFn = make,
+            }),
+            .dep = dep,
+        };
+
+        self.step.dependOn(&dep.builder.install_tls.step);
+
+        return self;
+    }
+
+    fn make(step: *std.Build.Step, prog_node: std.Progress.Node) anyerror!void {
+        _ = prog_node;
+        const self: *InstallDepStep = @fieldParentPtr("step", step);
+
+        var dir = try std.fs.cwd().openDir(self.dep.builder.install_prefix, .{
+            .iterate = true,
+        });
+        defer dir.close();
+
+        var iter = try dir.walk(step.owner.allocator);
+        while (try iter.next()) |ent| {
+            const outpath = step.owner.pathJoin(&.{ step.owner.install_prefix, ent.path });
+            switch (ent.kind) {
+                .directory => std.fs.cwd().makeDir(outpath) catch |e| switch (e) {
+                    error.PathAlreadyExists => {},
+                    else => return e,
+                },
+                else => {
+                    const inpath = step.owner.pathJoin(&.{ self.dep.builder.install_prefix, ent.path });
+                    try std.fs.cwd().copyFile(inpath, std.fs.cwd(), outpath, .{});
+                },
+            }
+        }
+    }
+};