I got bored and reverse engineered how SCO #cpio is able to store such large files in their archives when the newc format only officially supports 4GiB file entries.

I am not a coder, so I just made some files with cpio from the Heirloom Toolset and looked at them in hexdump.

#rpm packages use #newc for payload and have the same 4 GiB individual limit. Maybe they should adopt this extension. The they can have up to 9 EiB entries, which should be good enough. 🤪

https://gist.github.com/ruario/b02c762c95d6521d5df4f798cd795318

Ever wondered about the inode trunctation in #cpio formats and what that might mean for the integrity of your archives on modern systems?

No? No, I didn't think so because that is nerdy as fuck!!! 🤓

Nonetheless, I typed this up. No need to… umm… thank me. 🤪

https://gist.github.com/ruario/b09334336f202bef0c3e1b1c6f5b1451

Since 1993, I have favored #cpio archives for my personal data over #tar. When I used #Unix SYSVR3.2.3 on an AT&T 3B2/600, tar was buggy, and didn't preserve as much file details as cpio.

I was archiving up some old backup incrementals for posterity, and decided to just change to tar. It's gotta be the case that these 33 years later, & a dozen reimplementations of both tar & cpio, that tar is the better choice, no?

(I am using the #GNU versions of tar & cpio now, of course).

#Linux

cpio – Dateien aus Archiven und in Archive kopieren

https://andreas-moor.de/cpio-dateien-aus-archiven-und-in-archive-kopieren/

Ещё одна заметка про tar

Ко мне как-то обратился коллега с вопросом: «А ты запомнил команду для подготовки архива .tar.gz ?» И я такой на автомате: « tar zcf имя.tar.gz ... » А он мне в ответ: «Нет, ты не понял. Ты эту команду запомнил? Мне приходится «гуглить» каждый раз, когда требуется сделать архив.» Ах, вот в чём дело. Действительно, команду я запомнил и уже давольно давно. Если уважаемый читать хочет узнать немного больше, то предлагаю продолжить чтение. Но хочу предупредить, что ничего ранее неизвестного и сокровенного в заметке про tar не стоит ждать (почти). Всё ещё хочется узнать подробности? Давайте читать дальше.

https://habr.com/ru/articles/897872/

#tar #cpio #pax #архиваторы

I really did underestimate #xz as compression for a #cpio #initramdisk:

I was able to just shove the pre-made, full & uncut #toybox binary from @landley and still have some breathing room.

Tho I expect this to change once I put a #linux #kernel in that has actual #networking capabilities...

This will be interesting for OS/1337.

http://landley.net/toybox/bin/
https://landley.net/toybox/help.html

#OS1337 #LinuxDevelopment #EmbeddedLinux #Development

a macOS .pkg file – an xar archive file
https://en.wikipedia.org/wiki/.pkg

https://en.wikipedia.org/wiki/xar_(archiver) – using xar is pretty similar to tar

https://linux.die.net/man/1/xar

Inside the .pkg, you will find a file by the name *.pkg/Payload. That's in fact a gzipped cpio file, so this will show you its content:

$ gzip -cd *.pkg/Payload | cpio -itv
https://wp.jochen.hayek.name/blog-en/2023/04/20/macos-pkg-file/
#cpio #gzip #tar #xar

“Swap the bytes of each halfword in the files”

WTF!?

#Cpio

#cpio #difference #tar
【質問】tar と cpio の違いは何ですか。
http://tooljp.com/linux/faq/010DCDF29B95D152492579B7003DD886.html

2014-10-06にブックマーク