Add regression test for compile data in alternate packages (#3193)

Author: UebelAndre

rust/private/utils.bzl

@@ -865,7 +865,8 @@ def _symlink_for_non_generated_source(ctx, src_file, package_root):
         File: The created symlink if a non-generated file, or the file itself.
     """
 
-    if src_file.is_source or src_file.root.path != ctx.bin_dir.path:
+    src_short_path = paths.relativize(src_file.path, src_file.root.path)
+    if (src_file.is_source or src_file.root.path != ctx.bin_dir.path) and paths.starts_with(src_short_path, package_root):
         src_short_path = paths.relativize(src_file.path, src_file.root.path)
         src_symlink = ctx.actions.declare_file(paths.relativize(src_short_path, package_root))
         ctx.actions.symlink(

test/unit/compile_data/data/BUILD.bazel

@@ -0,0 +1,5 @@
+alias(
+    name = "data",
+    actual = "data.txt",
+    visibility = ["//test/unit/compile_data/src:__pkg__"],
+)

test/unit/compile_data/data/data.txt

@@ -0,0 +1 @@
+Hello World

test/unit/compile_data/src/BUILD.bazel

@@ -0,0 +1,35 @@
+load("@bazel_skylib//rules:write_file.bzl", "write_file")
+load("//rust:defs.bzl", "rust_library", "rust_test")
+
+write_file(
+    name = "lib_rs",
+    out = "lib.rs",
+    content = """\
+pub const DATA: &str = include_str!(env!(\"COMPILE_DATA\"));
+
+#[cfg(test)]
+mod test {
+    #[test]
+    fn test_data() {
+        assert_eq!(super::DATA.trim(), "Hello World");
+    }
+}
+""".splitlines(),
+    newline = "unix",
+)
+
+rust_library(
+    name = "lib",
+    srcs = [":lib.rs"],
+    compile_data = ["//test/unit/compile_data/data"],
+    edition = "2021",
+    rustc_env = {
+        "COMPILE_DATA": "$(execpath //test/unit/compile_data/data)",
+    },
+)
+
+rust_test(
+    name = "test",
+    crate = ":lib",
+    edition = "2021",
+)