32 lines
1.0 KiB
Bash
Executable File
32 lines
1.0 KiB
Bash
Executable File
#!/bin/bash
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#utilties for reading shim disk images
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extract_initramfs() {
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local kernel_bin="$1"
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local working_dir="$2"
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local output_dir="$3"
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#first stage
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local kernel_file="$(basename $kernel_bin)"
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local binwalk_out=$(binwalk --extract $kernel_bin --directory=$working_dir --run-as=root)
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local stage1_file=$(echo $binwalk_out | pcregrep -o1 "\d+\s+0x([0-9A-F]+)\s+gzip compressed data")
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local stage1_dir="$working_dir/_$kernel_file.extracted"
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local stage1_path="$stage1_dir/$stage1_file"
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#second stage
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binwalk --extract $stage1_path --directory=$stage1_dir --run-as=root > /dev/null
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local stage2_dir="$stage1_dir/_$stage1_file.extracted/"
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local cpio_file=$(file $stage2_dir/* | pcregrep -o1 "([0-9A-F]+):\s+ASCII cpio archive")
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local cpio_path="$stage2_dir/$cpio_file"
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rm -rf $output_dir
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cat $cpio_path | cpio -D $output_dir -imd --quiet
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}
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extract_modules() {
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local output_path="$1"
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local shim_rootfs="$2"
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local modules_dir="$shim_rootfs/lib/modules"
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mksquashfs $modules_dir $output_path -noappend -comp gzip
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} |