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https://github.com/kata-containers/kata-containers.git
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fcab7c3a01
When starting an initrd the kernel expects to find /dev/console in the initrd,
so that it can connect it as stdin/stdout/stderr to the /init process. If the
device node is missing the kernel will complain that it was unable to open an
initial console. If kata-agent is the initrd init process, it will also result
in log messages not being logged to console and thus not forwarded to host
syslog.
Add a set of standard device nodes for completeness, so that console logging
works. To do that we install the makedev packge which provides a MAKEDEV helper
that knows the major/minor numbers. Unfortunately the debian package tries to
create devnodes from postinst, which can be suppressed if systemd-detect-virt
is present. That's why we create a small dummy script that matches what
systemd-detect-virt would output (anything is enough to suppress mknod).
Fixes: #6261
Signed-off-by: Jeremi Piotrowski <jpiotrowski@microsoft.com>
(cherry picked from commit 76e926453a)
Signed-off-by: Greg Kurz <groug@kaod.org>
44 lines
1.2 KiB
Bash
44 lines
1.2 KiB
Bash
# Copyright (c) 2018 Yash Jain, 2022 IBM Corp.
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#
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# SPDX-License-Identifier: Apache-2.0
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build_dbus() {
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local rootfs_dir=$1
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ln -sf /lib/systemd/system/dbus.service $rootfs_dir/etc/systemd/system/dbus.service
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ln -sf /lib/systemd/system/dbus.socket $rootfs_dir/etc/systemd/system/dbus.socket
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}
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build_rootfs() {
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local rootfs_dir=$1
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local multistrap_conf=multistrap.conf
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# For simplicity's sake, use multistrap for foreign and native bootstraps.
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cat > "$multistrap_conf" << EOF
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[General]
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cleanup=true
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aptsources=Ubuntu
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bootstrap=Ubuntu
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[Ubuntu]
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source=$REPO_URL
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keyring=ubuntu-keyring
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suite=focal
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packages=$PACKAGES $EXTRA_PKGS
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EOF
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if ! multistrap -a "$DEB_ARCH" -d "$rootfs_dir" -f "$multistrap_conf"; then
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build_dbus $rootfs_dir
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fi
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rm -rf "$rootfs_dir/var/run"
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ln -s /run "$rootfs_dir/var/run"
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cp --remove-destination /etc/resolv.conf "$rootfs_dir/etc"
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# Reduce image size and memory footprint by removing unnecessary files and directories.
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rm -rf $rootfs_dir/usr/share/{bash-completion,bug,doc,info,lintian,locale,man,menu,misc,pixmaps,terminfo,zsh}
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# Minimal set of device nodes needed when AGENT_INIT=yes so that the
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# kernel can properly setup stdout/stdin/stderr for us
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pushd $rootfs_dir/dev
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MAKEDEV -v console tty ttyS null zero fd
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popd
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}
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