kexec-tools/mkfadumprd
Lichen Liu a74225f763 fadump: preserve file modification time to help with hardlinking
Resolves: bz2139000
Upstream: Fedora
Conflict: None

commit f33c99e347
Author: Hari Bathini <hbathini@linux.ibm.com>
Date:   Mon Oct 31 15:42:21 2022 +0530

    fadump: preserve file modification time to help with hardlinking

    With commit fa9201b2 ("fadump: isolate fadump initramfs image within
    the default one"), initramfs image gets to hold two images, one for
    production kernel boot purpose and the other for capture kernel boot.
    Most files are common among the two images. Retain file modification
    time to replace duplicate files with hardlinks and save space. Also,
    avoid unnecessarily compressing fadump image that is decompressed
    immediately anyway.

    Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
    Reviewed-by: Philipp Rudo <prudo@redhat.com>

Signed-off-by: Lichen Liu <lichliu@redhat.com>
2022-12-22 14:36:23 +08:00

77 lines
2.8 KiB
Bash

#!/bin/bash --norc
# Generate an initramfs image that isolates dump capture capability within
# the default initramfs using zz-fadumpinit dracut module.
if [[ -f /etc/sysconfig/kdump ]]; then
. /etc/sysconfig/kdump
fi
[[ $dracutbasedir ]] || dracutbasedir=/usr/lib/dracut
. $dracutbasedir/dracut-functions.sh
. /lib/kdump/kdump-lib.sh
. /lib/kdump/kdump-logger.sh
#initiate the kdump logger
if ! dlog_init; then
echo "mkfadumprd: failed to initiate the kdump logger."
exit 1
fi
MKFADUMPRD_TMPDIR="$(mktemp -d -t mkfadumprd.XXXXXX)"
[ -d "$MKFADUMPRD_TMPDIR" ] || perror_exit "mkfadumprd: mktemp -d -t mkfadumprd.XXXXXX failed."
trap '
ret=$?;
[[ -d $MKFADUMPRD_TMPDIR ]] && rm --one-file-system -rf -- "$MKFADUMPRD_TMPDIR";
exit $ret;
' EXIT
# clean up after ourselves no matter how we die.
trap 'exit 1;' SIGINT
MKDUMPRD="/sbin/mkdumprd -f"
# Default boot initramfs to be rebuilt
REBUILD_INITRD="$1" && shift
TARGET_INITRD="$1" && shift
FADUMP_INITRD="$MKFADUMPRD_TMPDIR/fadump.img"
### First build an initramfs with dump capture capability
# this file tells the initrd is fadump enabled
touch "$MKFADUMPRD_TMPDIR/fadump.initramfs"
ddebug "rebuild fadump initrd: $FADUMP_INITRD $DEFAULT_INITRD $KDUMP_KERNELVER"
# Don't use squash for capture image or default image as it negatively impacts
# compression ratio and increases the size of the initramfs image.
# Don't compress the capture image as uncompressed image is needed immediately.
# Also, early microcode would not be needed here.
if ! $MKDUMPRD "$FADUMP_INITRD" -i "$MKFADUMPRD_TMPDIR/fadump.initramfs" /etc/fadump.initramfs --omit squash --no-compress --no-early-microcode; then
perror_exit "mkfadumprd: failed to build image with dump capture support"
fi
### Unpack the initramfs having dump capture capability retaining previous file modification time.
# This helps in saving space by hardlinking identical files.
mkdir -p "$MKFADUMPRD_TMPDIR/fadumproot"
if ! cpio -id --preserve-modification-time --quiet -D "$MKFADUMPRD_TMPDIR/fadumproot" < "$FADUMP_INITRD"; then
derror "mkfadumprd: failed to unpack '$MKFADUMPRD_TMPDIR'"
exit 1
fi
### Pack it into the normal boot initramfs with zz-fadumpinit module
_dracut_isolate_args=(
--rebuild "$REBUILD_INITRD" --add zz-fadumpinit
-i "$MKFADUMPRD_TMPDIR/fadumproot" /fadumproot
-i "$MKFADUMPRD_TMPDIR/fadumproot/usr/lib/dracut/hostonly-kernel-modules.txt"
/usr/lib/dracut/fadump-kernel-modules.txt
)
# Same as setting zstd in mkdumprd
if ! have_compression_in_dracut_args; then
if is_squash_available && dracut_have_option "--squash-compressor"; then
_dracut_isolate_args+=(--squash-compressor zstd)
elif is_zstd_command_available; then
_dracut_isolate_args+=(--compress zstd)
fi
fi
if ! dracut --force --quiet "${_dracut_isolate_args[@]}" "$@" "$TARGET_INITRD"; then
perror_exit "mkfadumprd: failed to setup '$TARGET_INITRD' with dump capture capability"
fi