Add shadow_scan (confirm + rm -r upstream dups)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/sbo-batch-test b/sbo-batch-test
index c028df1..9a4b2a9 100755
--- a/sbo-batch-test
+++ b/sbo-batch-test
@@ -369,6 +369,35 @@ collect_shadows() {
   done < <(find "${personal_dirs[@]}" -mindepth 1 -maxdepth 1 -type d)
 }
 
+# Show the upstream dups of personal packages, confirm, and rm -r them. Reads
+# the set from collect_shadows. Interactive by design (the user wants to see
+# removals before they happen). No git (the 15.0 tree is rsync'd, not git).
+shadow_scan() {
+  local root="$1"
+  local -a to_shadow=()
+  mapfile -t to_shadow < <(collect_shadows "$root")
+  if [[ ${#to_shadow[@]} -eq 0 ]]; then
+    echo "No upstream packages match your personal subtrees. Nothing to shadow."
+    return
+  fi
+  echo
+  echo "The following upstream packages will be shadowed (rm -r):"
+  local item
+  for item in "${to_shadow[@]}"; do
+    echo "  - $item"
+  done
+  echo
+  read -rp "Proceed? [y/N] " confirm
+  if [[ ! "$confirm" =~ ^[Yy]$ ]]; then
+    echo "Aborted shadowing; no packages were removed."
+    return
+  fi
+  for item in "${to_shadow[@]}"; do
+    echo "Shadowing: $item"
+    rm -r "${root:?}/$item"
+  done
+}
+
 # =============================================================================
 # Package cache. Persistent, on-disk store of built packages so unchanged deps
 # are installed from cache instead of rebuilt. Layout mirrors the SBo tree: