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

CODE/linux/tmp_diff_libc.sh

@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+set -u
+IMG=/home/deshab/deshab-dev.img
+L=$(losetup --find --show --partscan "$IMG")
+sleep 0.3
+M=$(mktemp -d)
+mount -o ro "${L}p1" "$M"
+E=$(mktemp -d); R=$(mktemp -d)
+mount -o loop,ro "$M/boot/linux-extra-rootfs.img" "$E"
+mount -o loop,ro "$M/boot/linux-rootfs.img" "$R"
+cp "$R/usr/lib/libc.so.6" /tmp/libc.vdb
+cp "$E/usr/lib/libc.so.6" /tmp/libc.persist
+umount "$R"; umount "$E"; umount "$M"
+rmdir "$R" "$E" "$M"
+losetup -d "$L"
+python3 - <<'PY'
+a = open('/tmp/libc.vdb','rb').read()
+b = open('/tmp/libc.persist','rb').read()
+print("len", len(a), len(b))
+diffs = [i for i in range(min(len(a),len(b))) if a[i] != b[i]]
+print("num_diff_bytes", len(diffs))
+if diffs:
+    # group into ranges
+    ranges = []
+    s = p = diffs[0]
+    for i in diffs[1:]:
+        if i == p + 1:
+            p = i
+        else:
+            ranges.append((s, p)); s = p = i
+    ranges.append((s, p))
+    print("num_ranges", len(ranges))
+    for s, e in ranges[:40]:
+        print(f"  range 0x{s:x}-0x{e:x} ({e-s+1} bytes) page=0x{s & ~0xfff:x}")
+PY