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# Initramfs unpacker - unpacks initramfs images into /tmp
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# Copyright © 2013-2019 Teddy Hogeborn
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# Copyright © 2013-2019 Björn Påhlsson
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# Copyright © 2013-2018 Teddy Hogeborn
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# Copyright © 2013-2018 Björn Påhlsson
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# This file is part of Mandos.
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if $cpio --quiet --list --file="$imgfile" >/dev/null 2>&1; then
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# Number of bytes to skip to get to the compressed archive
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skip=$(($(LANG=C $cpio --io-size=1 --list --file="$imgfile" 2>&1 \
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--expression='s/^\([0-9]\+\) blocks$/\1/p')+8))
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if [ -x /usr/lib/dracut/skipcpio ]; then
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catimg="/usr/lib/dracut/skipcpio $imgfile"
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catimg="dd if=$imgfile bs=$skip skip=1 status=noxfer"
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| sed --quiet --expression='s/^\([0-9]\+\) blocks$/\1/p')+8))
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catimg="dd if=$imgfile bs=$skip skip=1 status=noxfer"
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echo "No microcode detected"
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catimg="cat -- $imgfile"
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# Determine the compression method
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if { $catimg 2>/dev/null | zcat --test >/dev/null 2>&1;
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[ ${PIPESTATUS[-1]} -eq 0 ]; }; then
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elif { $catimg 2>/dev/null | bzip2 --test >/dev/null 2>&1;
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[ ${PIPESTATUS[-1]} -eq 0 ]; }; then
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decomp="bzip2 --stdout --decompress"
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elif { $catimg 2>/dev/null | lzop --test >/dev/null 2>&1;
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[ ${PIPESTATUS[-1]} -eq 0 ]; }; then
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decomp="lzop --stdout --decompress"
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elif { $catimg 2>/dev/null | zstd --test >/dev/null 2>&1;
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[ ${PIPESTATUS[-1]} -eq 0 ]; }; then
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decomp="zstdcat --stdout --decompress"
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echo "Could not determine compression of ${imgfile}; trying to skip ${skip} bytes" >&2
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catimg="dd if=$imgfile bs=$skip skip=1 status=noxfer"
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*skipcpio*) echo "Microcode detected, skipping";;
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*) echo "Microcode detected, skipping ${skip} bytes";;
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# Determine the compression method
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if { $catimg 2>/dev/null | zcat --test >/dev/null 2>&1;
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[ ${PIPESTATUS[-1]} -eq 0 ]; }; then
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elif { $catimg 2>/dev/null | bzip2 --test >/dev/null 2>&1;
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[ ${PIPESTATUS[-1]} -eq 0 ]; }; then
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decomp="bzip2 --stdout --decompress"
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elif { $catimg 2>/dev/null | lzop --test >/dev/null 2>&1;
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[ ${PIPESTATUS[-1]} -eq 0 ]; }; then
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decomp="lzop --stdout --decompress"
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echo "Error: Could not determine type of $imgfile" >&2
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$catimg 2>/dev/null | $decomp | ( cd -- "$imgdir" && $cpio --quiet )
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if [ ${PIPESTATUS[-1]} -eq 0 ]; then
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echo "$imgfile unpacked into $imgdir"