Bootstrap with ethereal chroot method

[bwoodsend]

I'm trying to build packages for aarch64 on an intel machine using Docker with Qemu architecture emulation. Qemu clashes with the default chroot method (gives ERROR unshare (Invalid argument)) so, since this is a throwaway container, I'm trying to use ethereal.

To summarise my where I've got to, this is what I'm running:

git clone [email protected]:void-linux/void-packages.git
cd void-packages
docker run --rm -it --privileged -v "$PWD:/io" --platform=linux/aarch64 ghcr.io/void-linux/void-linux:latest-mini-aarch64-musl

Then inside the container:

xbps-install -ySu xbps git bash util-linux
bash
cd /io/
git config --global --add safe.directory /io
echo -e 'XBPS_CHROOT_CMD=ethereal\nXBPS_ALLOW_CHROOT_BREAKOUT=yes' > etc/conf
./xbps-src binary-bootstrap
./xbps-src pkg python3-ultrajson  # package chosen arbitrarily 

The ./xbps-src binary-bootstrap step appears to do absolutely nothing – it exits immediately with exit code 0 and no output without populating masterdir then ./xbps-src pkg $anything gives me => ERROR: Bootstrap not installed in /io/masterdir, can't continue..

Is there something different I have to do instead of binary-bootstrap to bootstrap with ethereal?

[classabbyamp]

you may want to take a look at what our CI does, as it uses the ethereal method in a ghcr.io/void-linux/xbps-src-masterdir container

notably, see:

void-packages/.github/workflows/build.yaml

Lines 64 to 90 in a161833

	- name: Prepare container
	run: |
	# switch to repo-ci mirror
	mkdir -p /etc/xbps.d && cp /usr/share/xbps.d/*-repository-*.conf /etc/xbps.d/
	sed -i 's|repo-default|repo-ci|g' /etc/xbps.d/*-repository-*.conf
	# Sync and upgrade once, assume error comes from xbps update
	xbps-install -Syu || xbps-install -yu xbps
	# Upgrade again (in case there was a xbps update)
	xbps-install -yu
	- name: Clone and checkout
	uses: classabbyamp/treeless-checkout-action@v1
	- name: Create hostrepo and prepare masterdir
	run: |
	ln -s "$(pwd)" /hostrepo &&
	common/travis/set_mirror.sh &&
	common/travis/prepare.sh &&
	common/travis/fetch-xtools.sh
	- run: common/travis/changed_templates.sh
	- name: Build and check packages
	run: |
	(
	here="$(pwd)"
	cd /
	"$here/common/travis/build.sh" "$BOOTSTRAP" "$ARCH" "$TEST"
	)

https://github.com/void-linux/void-packages/blob/master/common/travis/prepare.sh
https://github.com/void-linux/void-packages/blob/master/common/travis/build.sh

[bwoodsend]

This is the line I was missing. Thanks!

[Johnnynator]

Your docker container IS the masterdir in the case of the ethereal method.

I would recommend skip the docker part if your host is running void (or at least provides xbps).
Creating and using non native masterdirs works fine as long as the foreign architecture is registered with binfmt_misc

The way I would do it on void would be like this:

• Install qemu-user-static and binfmt-support
• enable the binfmt-support service
• ./xbps-src binary-bootstrap -m masterdir-aarch64 aarch64
• ./xbps-pkg -m masterdir-aarch64 pkg <pkg>