mirror of
https://github.com/coreos/ignition-dracut.git
synced 2026-02-06 09:45:58 +01:00
ecaa36ff02
It prevents systemctl status and journalctl from complaining when run
from the emergency shell:
WARNING: terminal is not fully functional
- (press RETURN)
The cost is 6 KiB of image size.
115 lines
3.3 KiB
Bash
Executable File
115 lines
3.3 KiB
Bash
Executable File
#!/bin/bash
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# Copyright (c) 2013 The CoreOS Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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set -e
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USAGE="Usage: $0 [-k 4.6.0] [-m] [-c /build/amd64-usr] [-o bootengine.cpio]
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Options:
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-k VERSION Kernel version of modules to include
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-m Setup mounts for /dev /proc /sys and /run
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-c CHROOT Chroot into the given directory
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-o OUT.cpio Alternate path to write the initrd
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This tool uses dracut to update /usr/share/bootengine/bootengine.cpio
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Since dracut assumes it is always run on the target system we need to support
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wrapping it in a way that fools it into using the files from the target image.
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This is all kinds of terrible and only works because the target arch is the
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same as the host arch.
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After many terrible experiences from this procedure this script will create a
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new filesystem namespace when operating inside the chroot, that way anything
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bad that happens will be less likely to hurt the host system. But no promises!
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"
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DRACUT_ARGS=(
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--force
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--no-hostonly
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--no-compress
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--omit i18n
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--omit lvm
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--omit multipath
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--omit network
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)
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SETUP_MOUNTS=
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USE_CHROOT=
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CPIO_PATH="/usr/share/bootengine/bootengine.cpio"
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KERNEL=
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while getopts "hmc:k:o:" OPTION
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do
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case $OPTION in
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c) USE_CHROOT="$OPTARG";;
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k) KERNEL="$OPTARG";;
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m) SETUP_MOUNTS=1;;
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o) CPIO_PATH="$OPTARG";;
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h) echo "$USAGE"; exit;;
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*) exit 1;;
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esac
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done
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if [[ -n "$USE_CHROOT" && ! -d "$USE_CHROOT" ]]; then
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echo "$0: chroot $USE_CHROOT does not exist!" >&2
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exit 1
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fi
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if [[ -z "$USE_CHROOT" && "$SETUP_MOUNTS" -eq 1 ]]; then
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echo "$0: -c chrootpath option is required with the -m option" >&2
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exit 1
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fi
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if [[ $(id -u) -ne 0 ]]; then
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echo "$0: this script must be run as root!" >&2
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exit 1
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fi
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# Alternative to mount --make-rprivate /
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# Doing it the ugly way is required because if this is run inside a chroot
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# such as the CoreOS SDK / is unlikely to be a mount point.
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mount_private() {
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awk '$7 ~ /^shared:/{print $5}' /proc/self/mountinfo \
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| xargs -r -n1 mount --make-private
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}
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if [[ "$SETUP_MOUNTS" -eq 1 ]]; then
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# To ensure we don't break the rest of the system re-run ourselves in
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# a new namespace, that way no one else sees our mounts.
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if cmp -s /proc/self/mountinfo /proc/${PPID}/mountinfo; then
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echo "Creating new filesystem namespace"
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exec unshare --mount -- "$0" "$@"
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exit 1
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fi
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if cmp -s /proc/self/mountinfo /proc/${PPID}/mountinfo; then
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echo "Creating a new filesystem namespace seems to have failed!" >&2
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exit 1
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fi
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echo "Mounting virtual filesystems"
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mount_private
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mount -n -t proc proc "${USE_CHROOT}/proc"
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mount -n --bind /dev "${USE_CHROOT}/dev"
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mount -n --bind /sys "${USE_CHROOT}/sys"
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mount -n --bind /run "${USE_CHROOT}/run"
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fi
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if [[ -n "$KERNEL" ]]; then
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DRACUT_ARGS+=( "--kver" "$KERNEL" )
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else
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DRACUT_ARGS+=( "--no-kernel" )
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fi
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mkdir -p "${USE_CHROOT}$(dirname "$CPIO_PATH")"
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if [[ -n "$USE_CHROOT" ]]; then
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echo "Running dracut in $USE_CHROOT"
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LC_ALL=C chroot "$USE_CHROOT" ldconfig -X
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LC_ALL=C chroot "$USE_CHROOT" dracut "${DRACUT_ARGS[@]}" "$CPIO_PATH"
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else
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echo "Running dracut in root"
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LC_ALL=C dracut "${DRACUT_ARGS[@]}" "$CPIO_PATH"
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fi
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chmod 644 "${USE_CHROOT}${CPIO_PATH}"
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