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

CODE/linux/check_libc_on_img.sh

@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+set -euo pipefail
+IMG="${1:-/mnt/d/Code/DEAICUP/Deshab/ISO/deshab-dev.img}"
+LOOP=$(losetup --find --show --partscan "$IMG")
+sleep 0.3
+ESP=$(mktemp -d)
+mount "${LOOP}p1" "$ESP"
+cp -f "$ESP/boot/linux-rootfs.img" /tmp/linux-rootfs-check.img
+umount "$ESP"
+losetup -d "$LOOP"
+rmdir "$ESP"
+M=$(mktemp -d)
+mount -o loop,ro /tmp/linux-rootfs-check.img "$M"
+python3 - "$M" <<'PY'
+import os, sys
+root = sys.argv[1]
+path = None
+for cand in (root + "/usr/lib/libc.so.6", root + "/lib/libc.so.6"):
+    if os.path.exists(cand):
+        path = cand
+        break
+print("libc", path)
+with open(path, "rb") as f:
+    data = f.read()
+off = 0x199140
+print("size", len(data), "at", hex(off), data[off:off+16].hex())
+print("endbr64 count", data.count(b"\xf3\x0f\x1e\xfa"))
+print("badnop count", data.count(b"\x0f\x1f\x40\x00"))
+print("nop90 at site", data[off:off+4] == b"\x90\x90\x90\x90")
+PY
+umount "$M"
+rmdir "$M"
+echo "===== df ====="
+df -h /home /tmp | head
+ls -lh "$IMG" /tmp/linux-rootfs-check.img