fix CI running out of disk space

Author: marler8997

runtest.zig

@@ -115,13 +115,40 @@ pub fn main() !void {
     }
 }
 
+fn isCompilerPath(path: []const u8) bool {
+    var it = std.fs.path.NativeComponentIterator.init(path) catch std.debug.panic("invalid path '{s}'", .{path});
+    {
+        const name = (it.next() orelse return false).name;
+        if (!std.mem.eql(u8, name, "install")) return false;
+    }
+    _ = it.next() orelse return false;
+
+    const leaf = (it.next() orelse return false).name;
+    return std.mem.eql(u8, leaf, "files");
+}
+
 fn copyEnvDir(
     allocator: std.mem.Allocator,
     in_root: []const u8,
     out_root: []const u8,
     in_path: []const u8,
     out_path: []const u8,
 ) !void {
+    std.debug.assert(std.mem.startsWith(u8, in_path, in_root));
+    std.debug.assert(std.mem.startsWith(u8, out_path, out_root));
+
+    {
+        const separators = switch (builtin.os.tag) {
+            .windows => "\\/",
+            else => "/",
+        };
+        const relative = std.mem.trimLeft(u8, in_path[in_root.len..], separators);
+        if (isCompilerPath(relative)) {
+            std.debug.print("skipping '{s}'\n", .{relative});
+            return;
+        }
+    }
+
     var in_dir = try std.fs.cwd().openDir(in_path, .{ .iterate = true });
     defer in_dir.close();