rootfs-create: verbose mmdebstrap by default, --debug under DEBUG=yes

mmdebstrap setup failures routinely surface as a one-line
'E: setup failed' in Armbian build logs with no context about
which package dep resolution actually blew up. Diagnosing those
(gnupg2/dirmngr sid/loong64 port-sync skew, package rename across
a release bump, etc.) currently requires rebuilding locally with
DEBUG=yes to see mmdebstrap's own progress/solver output.

Make --verbose the default so the normal build log shows apt's
per-package download + solver work. Gate --debug behind
DEBUG=yes for the heavier trace (hook hashes, command echoes)
that's only interesting when debugging rootfs bootstrap
failures.

Author: igorpecovnik

lib/functions/rootfs/rootfs-create.sh

@@ -100,6 +100,17 @@ function create_new_rootfs_cache_via_debootstrap() {
 		"'--components=${AGGREGATED_DEBOOTSTRAP_COMPONENTS_COMMA}'" # from aggregation.py
 		"'--skip=check/empty'"                                      # skips check if the rootfs dir is empty at start
 	)
+
+	# Verbosity: always show per-package download/install progress via
+	# --verbose. With DEBUG=yes escalate to --debug (superset of
+	# --verbose) which also adds mmdebstrap's own debug messages and
+	# bash xtrace on every --setup-hook/--customize-hook.
+	if [[ "${DEBUG}" == "yes" ]]; then
+		debootstrap_arguments+=("--debug")
+	else
+		debootstrap_arguments+=("--verbose")
+	fi
+
 	fetch_distro_keyring "$RELEASE"
 
 	# This is necessary to debootstrap from a non-official repo