WIP: Bzlmod part the one hundred-fourteenth

Add scripts/toggle-workspace.sh to test WORKSPACE.

Also removes obsolete test_version/.bazelrc file.

Author: mbland

scripts/toggle-workspace.sh

@@ -0,0 +1,69 @@
+#!/usr/bin/env bash
+#
+# Updates .bazelrc files to enable or disable WORKSPACE builds.
+#
+# This is for testing `WORKSPACE` and Bzlmod compatibility. The produced changes
+# should never be checked in. Run `git restore` and `git clean` to revert them
+# before committing.
+
+ROOTDIR="${BASH_SOURCE[0]%/*}/.."
+cd "$ROOTDIR"
+
+if [[ "$?" -ne 0 ]]; then
+  echo "Could not change to $ROOTDIR." >&2
+  exit 1
+elif [[ "$#" -gt 1  || "${1:-disable}" != 'disable' ]]; then
+  printf '%s\n' >&2 \
+    "Usage: $0 [ disable ]" \
+    "" \
+    "Updates .bazelrc files to enable or disable WORKSPACE builds."
+  exit 1
+fi
+
+workspace_options="build --noenable_bzlmod"
+bzlmod_options="build --enable_bzlmod"
+bazel_version="$(bazel --version 2>&1)"
+
+if [[ "$?" -ne 0 ]]; then
+  echo "failed to run `bazel --version`: $bazel_version" >&2
+  exit 1
+elif [[ "${bazel_version#* }" =~ ^(7|8)\. ]]; then
+  workspace_options="${workspace_options} --enable_workspace"
+  bzlmod_options="${bzlmod_options} --noenable_workspace"
+fi
+
+enabled_options="$workspace_options"
+disabled_options="$bzlmod_options"
+
+if [[ "$1" == "disable" ]]; then
+  enabled_options="$bzlmod_options"
+  disabled_options="$workspace_options"
+fi
+
+already_enabled="($enabled_options|import [./]*/.bazelrc)"
+
+# Searches for WORKSPACE instead of .bazelrc because not all repos may have a
+# .bazelrc file.
+while IFS="" read repo_marker_path; do
+  repo_path="${repo_marker_path%/*}"
+  bazelrc_path="$repo_path/.bazelrc"
+
+  # The top level repo is a special case.
+  if [[ "$repo_path" == "$repo_marker_path" ]]; then
+    bazelrc_path="./.bazelrc"
+  fi
+
+  if [[ ! -f "$bazelrc_path" ]]; then
+    echo "$enabled_options" > "$bazelrc_path"
+    continue
+  fi
+
+  content="$(< "$bazelrc_path")"
+
+  if [[ "$content" =~ $disabled_options ]]; then
+    echo "${content//$disabled_options/$enabled_options}" >"$bazelrc_path"
+  elif [[ ! "$content" =~ $already_enabled ]]; then
+    echo "$enabled_options" >> "$bazelrc_path"
+  fi
+
+done < <(find [A-Za-z0-9]* -name "WORKSPACE")