test-build: document installed_in_base deferral

1 files changed, 7 insertions, 3 deletions

diff --git a/.extras/test-build b/.extras/test-build
index 018030e..d830d69 100755
--- a/.extras/test-build
+++ b/.extras/test-build
@@ -182,9 +182,13 @@ declare -A HAS_README=()
 declare -A _vstate=()
 declare -A FETCH_DEPS=()   # prog -> 1: resolve via sbopkg in-container
 
-# Is a prog already present in the container base? Overridden at build time to
-# consult the image; in resolution we treat "in base" as a callback so the pure
-# topo logic stays testable. Default: not in base (self-check has no base db).
+# Is a prog already present in the container base? Kept as a callback so the
+# pure topo logic stays testable. Default: not in base.
+# ponytail: stub returns false, so a dep that the full-install image already
+#   provides currently reads as UNMET and needs a `drop:` override. Real fix
+#   belongs with the image-builder work: query the image's package db (e.g.
+#   `docker run --rm $ACTIVE_IMAGE ls /var/log/packages | grep`) once per run
+#   and consult it here. Deferred until the image exists (Task 10 / image-builder).
 installed_in_base() { return 1; }
 
 _resolve_visit() {