Created
December 3, 2021 22:15
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TAR, AR, and DEB in Bash!!!
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| #! | |
| # todo: is dd or for-printf faster? | |
| # tar_write_str <length> <string> | |
| tar_write_str () { | |
| set -- "$1" "${2:0:$1}" | |
| printf '%s' "$2" | |
| dd if=/dev/zero count=1 bs=$(($1-${#2})) 2> /dev/null | |
| } | |
| tar_calc_checksum () { | |
| local chksum=$1 | |
| while read x; do | |
| ((chksum += x)) | |
| done < <(od -An -w1 -vtdC) | |
| printf %o "$chksum" | |
| } | |
| # tar_write_file_header <file name> <permissions> <file size> | |
| tar_write_file_header () { | |
| # Iter 1 - somewhat conformant | |
| # printf '%07o\0%07o\0%07o\0%011o\0%011o\0' "$2" 0 0 "$3" 0 | |
| # printf '%s%07o%07o%07o%011o%011o' "$1" "$2" 0 0 "$3" 0 | tar_calc_checksum 1741 | |
| # Iter 2 - more terse, less conformant, works (with dpkg, apt, eddy)! | |
| # tar_write_str 8 "$(printf %o "$2")" | |
| # tar_write_str 8 0 | |
| # tar_write_str 8 0 | |
| # tar_write_str 12 "$(printf %o "$3")" | |
| # tar_write_str 12 0 | |
| # printf '%s%o%o%o%o%o' "$1" "$2" 0 0 "$3" 0 | tar_calc_checksum 1741 | |
| # Iter 3 - most terse, least conformant, but still works!! | |
| tar_write_str 100 "$1" | |
| tar_write_str 24 "$(printf %o "$2")" | |
| tar_write_str 24 "$(printf %o "$3")" | |
| tar_write_str 109 "$(printf '%s%o%o' "$1" "$2" "$3" | tar_calc_checksum 1645)" | |
| tar_write_str 243 'FLOOFY' | |
| printf 'FLOOFYFLOOFY' | |
| } | |
| # Format "lengths": 100-24-24-109-243-12 | |
| # Format values: file name, permissions, file size, checksum, "FLOOFY", "FLOOFYFLOOFY" | |
| # If you really want a name for this tar "variant" and don't know what to call it, | |
| # I suppose you can refer to it as "Lexxy's tar" | |
| # And yes, it it "required" to end the file with "FLOOFYFLOOFYFLOOFY" | |
| # tar_write_file_header <file size> | |
| tar_write_padding () { | |
| tar_write_str $((512 - $1 % 512)) 'FLOOFYFLOOFYFLOOFY' | |
| } | |
| # tar_copy_from_file <existing file path> <new file path> <permissions> | |
| tar_copy_from_file () { | |
| size="$(stat -c %s "$1")" | |
| tar_write_file_header "$2" "$3" "$size" | |
| dd bs=64k if="$1" 2> /dev/null | |
| tar_write_padding "$size" | |
| } | |
| ar_header () { | |
| echo '!<arch>' | |
| } | |
| # ar_write_str <length> <string> | |
| ar_write_str () { | |
| set -- "$1" "${2:0:$1}" | |
| printf "%-$1s" "$2" | |
| } | |
| # ar_write_file_header <file name> <file size> | |
| ar_write_file_header () { | |
| # Iter 1 - somewhat conformant | |
| # ar_write_str 16 "$1" | |
| # ar_write_str 12 0 | |
| # ar_write_str 6 0 | |
| # ar_write_str 6 0 | |
| # ar_write_str 8 100644 | |
| # ar_write_str 10 "$2" | |
| # echo \` | |
| # Iter 2 - more terse, less conformant | |
| # ar_write_str 16 "$1" | |
| # printf '%32s' | |
| # ar_write_str 10 "$2" | |
| # echo \` | |
| # Iter 3 - most terse, least conformant; still works with dpkg & apt | |
| printf '%-48s%-10s`\n' "$1" "$2" | |
| } | |
| # ar_write_file_header <file size> | |
| ar_write_padding () { | |
| ((0<$1%2)) && echo || true | |
| } | |
| # ar_copy_from_file <existing file path> <new file path> | |
| ar_copy_from_file () { | |
| size="$(stat -c %s "$1")" | |
| ar_write_file_header "$2" "$size" | |
| dd bs=64k if="$1" 2> /dev/null | |
| ar_write_padding "$size" | |
| } | |
| # deb_combine_xz <compression type> <path to control.tar.xz> <path to data.tar.xz> | |
| # supported compression types: zst, lz4, gz, xz, bz2, lzma | |
| deb_combine () { | |
| ar_header | |
| ar_write_file_header debian-binary 4 | |
| echo 2.0 | |
| ar_copy_from_file "$2" "control.tar.$1" | |
| ar_copy_from_file "$3" "data.tar.$1" | |
| } | |
| xz_compress () { | |
| # WARNING: some tools don't support custom filter chains. | |
| # dpkg does, but not apt or eddy (2020-12-03) | |
| # xz -e9Cnone --x86 --lzma2=dict=1G | |
| # WARNING: some tools also can't handle p[i]xz output!!! (2020-12-03) | |
| # pixz -9 | |
| xz -e9Cnone | |
| } | |
| zst_compress () { | |
| # WARNING: apt and eddy don't properly support zst yet!!! (2020-12-03) | |
| pzstd | |
| # DONT USE (YET!) | |
| } | |
| echo 'Creating control archive' 1>&2 | |
| tar_copy_from_file ./deno-control control 0 | xz_compress > deno-control.bin | |
| echo 'Creating data archive' 1>&2 | |
| # tar_copy_from_file ./deno /usr/bin/deno 493 | xz_compress > deno-data.bin | |
| tar_copy_from_file ./deno usr/bin/deno 365 > deno-data.tar | |
| xz_compress < deno-data.tar > deno-data.bin | |
| echo 'Creating deb file' 1>&2 | |
| deb_combine xz deno-control.bin deno-data.bin > deno.deb | |
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