https://github.com/bdrung/3cpio got support for listing and extracting cpio archives. 3cpio is available on Ubuntu now: https://launchpad.net/ubuntu/+source/rust-threecpio/
I'll change unmkinitramfs to use 3cpio in case it is installed. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to initramfs-tools in Ubuntu. https://bugs.launchpad.net/bugs/2059976 Title: unmkinitramfs is very slow on initrd from ubuntu 23.10+, solution proposed Status in initramfs-tools package in Ubuntu: Triaged Bug description: Since 23.10 the initrd consists of 4 embedded cpio: - amd microcode - intel microcode - firmware + kernel modules - rest (compressed) Previously it was: - amd microcode - intel microcode - rest (compressed) There is no archive size header for cpio, so unmkinitramfs has to parse headers of each entry in uncompressed archives. > time unmkinitramfs 23.04/{initrd,unpack} real 0m3.625s user 0m1.595s sys 0m3.467s > time unmkinitramfs 23.10/{initrd,unpack} real 0m15.982s user 0m20.174s sys 0m6.995s > for dir in 23.04/unpack/early*; do printf '%-20s %s\n' "$dir" "$(find "$dir" | wc -l)"; done 23.04/unpack/early 5 23.04/unpack/early2 6 > for dir in 23.10/unpack/early*; do printf '%-20s %s\n' "$dir" "$(find "$dir" | wc -l)"; done 23.10/unpack/early 5 23.10/unpack/early2 6 23.10/unpack/early3 2874 Here https://github.com/slowpeek/unmkinitramfs-turbo I've made it a lot faster with two changes: - bash instead of sh for bash's "read -N" - xxd dump of initrd instead of raw binary data I wonder, if the developers are interested in accepting my improvements into the code base? > time unmkinitramfs-classic-turbo 23.10/{initrd,unpack} real 0m2.209s user 0m2.161s sys 0m1.341s > time unmkinitramfs-turbo 23.10/{initrd,unpack} early .. + early2 .. + early3 .. + main .. + real 0m1.973s user 0m2.094s sys 0m1.244s All tools in the repo, even the classic one, feature -s/--scan option. With it, the tools only dump offset + size for embedded archives, nothing is unpacked. It can be used to measure parsing speed. In the repo there are three tools: - unmkinitramfs-classic: the original tool - unmkinitramfs-classic-turbo: the improved tool with minimal changes - unmkinitramfs-turbo: the improved tool with many changes to my tastes, extra dependency on "file" and some additional features (-ss option, decompression with 7za) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/2059976/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
