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proot/contrib/care_rearchiver.sh
Lucas Ramage c5590fa59d Add CARE utility scripts
care2docker utilizes a heredoc
to generate a dockerfile;
shellcheck detects those lines
as error, therefore they have been
explicitly ignored.

Closes: https://github.com/proot-me/proot/pull/110
2019-04-18 19:11:18 -04:00

63 lines
1.6 KiB
Bash
Executable File

#!/bin/bash
set -euo pipefail
IFS=$'\n\t'
####
#
# CARE re-archiver. Updates a CARE archive in .tgz.bin format.
# Prerequisites:
# - a folder containing the extraction of the CARE archive
# Usage:
# - add / remove / modify files in the folder
# - run care_rearchiver.sh archive.tgz.bin archive
#
# Copyright Jonathan Passerat-Palmbach, 2016
#
####
archive="$1"
mode="$2"
archive_size=$(printf "%d" "0x$(tail -c 8 "${archive}" | hexdump -e '16/1 "%02X"' | cut -d ' ' -f1)")
file_size=$(stat -c %s "${archive}")
footer_size=21
extracting_program_size=$((file_size - archive_size - footer_size))
archive_no_bin=$(basename "${archive}" .bin)
function unarchive() {
dd if="${archive}" of="${archive_no_bin}" bs=1 skip="${extracting_program_size}" count="${archive_size}"
tar zxf "${archive_no_bin}"
}
function archive() {
folder_name=$(basename "${archive_no_bin}" .tgz)
new_archive="${folder_name}_new.tgz.bin"
tar zcf "${archive_no_bin}" "${folder_name}"
new_archive_size=$(stat -c %s "${archive_no_bin}")
# add extracter
dd if="${archive}" of="${new_archive}" bs=1 skip=0 count=${extracting_program_size}
# add new archive
dd if="${archive_no_bin}" of="${new_archive}" bs=1 skip=0 seek=${extracting_program_size} count="${new_archive_size}"
## add footer
# I_LOVE_PIZZA
echo -en \\x49\\x5f\\x4c\\x4f\\x56\\x45\\x5f\\x50\\x49\\x5a\\x5a\\x41\\x00 >> "${new_archive}"
# size
echo -en "$(printf "%016X" "${new_archive_size}" | sed -e 's/\([0-9A-F]\{2\}\)/\\\x\1/g')" >> "${new_archive}"
chmod +x "${new_archive}"
rm "${archive_no_bin}"
}
if [ "${mode}" == "archive" ]; then
archive
else
unarchive
fi