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