Differential D18821

workaround a defect with bubblewrap and binfmt and qemu-arm-static
ClosedPublic
Actions

Authored by sitter on Feb 7 2019, 5:55 PM.

Details

Reviewers
bshah
• jriddell
Summary

binfmt is a kernel module that magically allows the kernel to figure out
an interpreter for any given binary. qemu-static can use it to
transparently run foreign architecture binaries against the kernel.
specifically this for example allows running an arm container on amd64.
alas, the way it is configured in 18.04 is kaput and actually prevents it
from working in certain cases (notably flatpak/bubblewrap).

fixed for 20.04 already

https://bugs.kde.org/show_bug.cgi?id=404042
https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1815100

Diff Detail

Branch
Neon/release-lts
Lint
No Linters Available
Unit
No Unit Test Coverage
Build Status
Buildable 7995
Build 8013: arc lint + arc unit
sitter requested review of this revision.Feb 7 2019, 5:55 PM
sitter created this revision.
sitter added reviewers: bshah, • jriddell.Feb 7 2019, 5:55 PM
sitter added a subscriber: dkardarakos.
sitter added a comment.Feb 7 2019, 6:09 PM

actual workaround call for the record: sudo update-binfmts --package qemu-user-static --install qemu-arm /usr/bin/qemu-arm-static --magic "\x7f\x45\x4c\x46\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00" --mask "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff" --offset 0 --credential yes --fix-binary yes

dkardarakos added a comment.Feb 7 2019, 6:16 PM

After executing the workaround command, flatpak-builder for arm works as expected.

bshah accepted this revision.Feb 7 2019, 8:57 PM

Perhaps similar needs to be done for aarch64?

This revision is now accepted and ready to land.Feb 7 2019, 8:57 PM
sitter added a comment.Feb 8 2019, 11:17 AM

If we need it right now then yes, if not I'd rather wait until we do. The ubuntu maintainer of qemu is seems super responsive and is open to fixing this in ubuntu proper, so we may not need the workaround in the long run.

Revision Contents
Changeset List

Diff 51118

View Options

debian/neon-settings.postinst

Loading...
View Options

debian/neon-settings.triggers

Loading...