ohhhhhhhhhhh (exclude linux-extra-rootfs.img build artifact)

CODE/linux/tmp_dbg_one.sh

@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+# Compare loop-mount view vs debugfs view of one "BAD" lib in extra-rootfs.
+set -uo pipefail
+IMG="${1:?usage: tmp_dbg_one.sh IMG}"
+NAME="${2:-libz.so.1.3.2}"
+OUT=/tmp/deshab-dbgone
+rm -rf "$OUT"; mkdir -p "$OUT"
+
+L=$(losetup --find --show --partscan "$IMG")
+sleep 0.3
+M=$(mktemp -d)
+mount -o ro "${L}p1" "$M" || { echo ESP_MOUNT_FAIL; exit 1; }
+# Copy the extra-rootfs image OFF drvfs first (loop off drvfs is suspect).
+cp "$M/boot/linux-extra-rootfs.img" "$OUT/extra.img"
+umount "$M"; rmdir "$M"; losetup -d "$L"
+
+echo "=== debugfs view (no kernel fs) ==="
+debugfs -R "dump /usr/lib/$NAME" "$OUT/df.$NAME" "$OUT/extra.img" 2>&1 | tail -2
+ls -l "$OUT/df.$NAME" 2>/dev/null
+head -c 64 "$OUT/df.$NAME" 2>/dev/null | od -A d -t x1 | head -5
+
+echo "=== loop-mount view (kernel ext4) ==="
+R=$(mktemp -d)
+if mount -o loop,ro "$OUT/extra.img" "$R"; then
+    ls -l "$R/usr/lib/$NAME"
+    head -c 64 "$R/usr/lib/$NAME" | od -A d -t x1 | head -5
+    md5sum "$R/usr/lib/$NAME" "$OUT/df.$NAME"
+    umount "$R"
+else
+    echo "loop mount FAILED"
+fi
+rmdir "$R"
+readelf -h "$OUT/df.$NAME" 2>&1 | grep -E 'Class|Type|Entry|program headers|section header size' || echo "readelf failed on debugfs copy"