Add rsync_excludes helper + self-check

Emits one anchored --exclude=/<dir>/ per SBO_PERSONAL_TREES key, so a
future rsync-based tree sync never deletes personal/pentesting clones
that are not on the sync source.

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

2 files changed, 19 insertions, 0 deletions

diff --git a/sbo-batch-test b/sbo-batch-test
index 5f9695d..a29461b 100755
--- a/sbo-batch-test
+++ b/sbo-batch-test
@@ -321,6 +321,16 @@ update_base() {
   echo "Base patched."
 }
 
+# Echo one anchored `--exclude=/<dir>/` per SBO_PERSONAL_TREES key, one per
+# line. Anchored to the tree root so rsync --delete never wipes a personal
+# clone (they are not on the rsync source). Empty when no personal trees.
+rsync_excludes() {
+  local dir
+  for dir in "${!SBO_PERSONAL_TREES[@]}"; do
+    echo "--exclude=/$dir/"
+  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:
diff --git a/test-logic.sh b/test-logic.sh
index 797041f..423d2b5 100755
--- a/test-logic.sh
+++ b/test-logic.sh
@@ -143,6 +143,15 @@ mkdir -p "$T/cat/verpkg"
 printf 'PRGNAM="verpkg"\nVERSION="3.4.5"\nREQUIRES=""\n' > "$T/cat/verpkg/verpkg.info"
 [[ "$(version_of "$T/cat/verpkg")" == "3.4.5" ]] && ok "version_of reads VERSION" || bad "version_of wrong, got [$(version_of "$T/cat/verpkg")]"
 
+# --- rsync_excludes: one anchored --exclude per personal tree key ------------
+declare -A SBO_PERSONAL_TREES=([personal]=url1 [pentesting]=url2)
+ex="$(rsync_excludes)"
+echo "$ex" | grep -qx -- "--exclude=/personal/"   && ok "rsync_excludes personal"   || bad "missing --exclude=/personal/, got [$ex]"
+echo "$ex" | grep -qx -- "--exclude=/pentesting/" && ok "rsync_excludes pentesting" || bad "missing --exclude=/pentesting/, got [$ex]"
+
+declare -A SBO_PERSONAL_TREES=()
+[[ -z "$(rsync_excludes)" ]] && ok "rsync_excludes empty for no trees" || bad "rsync_excludes should be empty, got [$(rsync_excludes)]"
+
 # --- result -----------------------------------------------------------------
 echo
 echo "$pass passed, $fail failed"