integration_test_setup.sh: load bash runfiles library

Instead of getting the rlocation function from [test-setup.sh](https://cs.opensource.google/bazel/bazel/+/master:tools/test/test-setup.sh;l=115), we should use the actual bash runfiles library which supports repo mapping.

Working towards: #18957

RELNOTES: None
PiperOrigin-RevId: 552778831
Change-Id: Ie747faf58a5c3fc33d38653130d9657224909430

src/test/shell/BUILD

@@ -45,7 +45,10 @@ sh_library(
         "unittest.bash",
         "unittest_utils.sh",
     ],
-    data = [":testenv.sh"],
+    data = [
+        ":testenv.sh",
+        "@bazel_tools//tools/bash/runfiles",
+    ],
     visibility = ["//visibility:public"],
 )
 

src/test/shell/bazel/BUILD

@@ -22,14 +22,6 @@ gen_workspace_stanza(
     ],
 )
 
-gen_workspace_stanza(
-    name = "rules_proto_stanza",
-    out = "rules_proto_stanza.txt",
-    repos = [
-        "rules_proto",
-    ],
-)
-
 filegroup(
     name = "test-deps",
     testonly = 1,
@@ -346,10 +338,7 @@ sh_test(
     name = "bazel_proto_library_test",
     size = "large",  # Downloads and compiles protobuf for *every* *test* *case*
     srcs = ["bazel_proto_library_test.sh"],
-    data = [
-        ":rules_proto_stanza.txt",
-        ":test-deps",
-    ],
+    data = [":test-deps"],
     exec_compatible_with = ["//:highcpu_machine"],
     tags = ["no_windows"],  # Doesn't work on Windows for unknown reason
 )

src/test/shell/bazel/bazel_proto_library_test.sh

@@ -48,8 +48,6 @@ function write_workspace() {
     mkdir -p "$workspace"
   fi
 
-  cat $(rlocation io_bazel/src/tests/shell/bazel/rules_proto_stanza.txt) >> "$workspace"WORKSPACE
-
   cat >> "$workspace"WORKSPACE << EOF
 load("@rules_proto//proto:repositories.bzl", "rules_proto_dependencies", "rules_proto_toolchains")
 rules_proto_dependencies()

src/test/shell/integration_test_setup.sh

@@ -20,7 +20,20 @@ function print_message_and_exit() {
 }
 
 if type rlocation >&/dev/null; then
-  # If rlocation is defined, use it to look up data-dependencies.
+  # An incomplete rlocation function is defined in Bazel's test-setup.sh script,
+  # load the actual Bash runfiles library from @bazel_tools//tools/bash/runfiles
+  # to make sure repo mappings is respected.
+  # --- begin runfiles.bash initialization v3 ---
+  # Copy-pasted from the Bazel Bash runfiles library v3.
+  set -uo pipefail; set +e; f=bazel_tools/tools/bash/runfiles/runfiles.bash
+  source "${RUNFILES_DIR:-/dev/null}/$f" 2>/dev/null || \
+    source "$(grep -sm1 "^$f " "${RUNFILES_MANIFEST_FILE:-/dev/null}" | cut -f2- -d' ')" 2>/dev/null || \
+    source "$0.runfiles/$f" 2>/dev/null || \
+    source "$(grep -sm1 "^$f " "$0.runfiles_manifest" | cut -f2- -d' ')" 2>/dev/null || \
+    source "$(grep -sm1 "^$f " "$0.exe.runfiles_manifest" | cut -f2- -d' ')" 2>/dev/null || \
+    { echo>&2 "ERROR: cannot find $f"; exit 1; }; f=; set -e
+  # --- end runfiles.bash initialization v3 ---
+
   # Load the unit test framework
   source "$(rlocation io_bazel/src/test/shell/unittest.bash)" \
     || print_message_and_exit "unittest.bash not found!"