55b0dd03b3
With commit fa9201b2 ("fadump: isolate fadump initramfs image within
the default one"), initramfs image gets to hold two squash images, one
for production kernel boot purpose and the other for capture kernel
boot. Having separate images improved reliability for both production
kernel and capture kernel boot scenarios, but the size of initramfs
image became considerably larger.
Instead of having squash images, compressing $initdir without using
squash images reduced the size of initramfs image for fadump case by
around 30%. So, avoid using squash for fadump case.
Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Reviewed-by: Philipp Rudo <prudo@redhat.com>
75 lines
2.6 KiB
Bash
75 lines
2.6 KiB
Bash
#!/bin/bash --norc
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# Generate an initramfs image that isolates dump capture capability within
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# the default initramfs using zz-fadumpinit dracut module.
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if [[ -f /etc/sysconfig/kdump ]]; then
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. /etc/sysconfig/kdump
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fi
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[[ $dracutbasedir ]] || dracutbasedir=/usr/lib/dracut
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. $dracutbasedir/dracut-functions.sh
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. /lib/kdump/kdump-lib.sh
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. /lib/kdump/kdump-logger.sh
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#initiate the kdump logger
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if ! dlog_init; then
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echo "mkfadumprd: failed to initiate the kdump logger."
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exit 1
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fi
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MKFADUMPRD_TMPDIR="$(mktemp -d -t mkfadumprd.XXXXXX)"
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[ -d "$MKFADUMPRD_TMPDIR" ] || perror_exit "mkfadumprd: mktemp -d -t mkfadumprd.XXXXXX failed."
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trap '
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ret=$?;
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[[ -d $MKFADUMPRD_TMPDIR ]] && rm --one-file-system -rf -- "$MKFADUMPRD_TMPDIR";
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exit $ret;
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' EXIT
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# clean up after ourselves no matter how we die.
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trap 'exit 1;' SIGINT
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MKDUMPRD="/sbin/mkdumprd -f"
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# Default boot initramfs to be rebuilt
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REBUILD_INITRD="$1" && shift
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TARGET_INITRD="$1" && shift
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FADUMP_INITRD="$MKFADUMPRD_TMPDIR/fadump.img"
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### First build an initramfs with dump capture capability
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# this file tells the initrd is fadump enabled
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touch "$MKFADUMPRD_TMPDIR/fadump.initramfs"
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ddebug "rebuild fadump initrd: $FADUMP_INITRD $DEFAULT_INITRD $KDUMP_KERNELVER"
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# Don't use squash for capture image or default image as it negatively impacts
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# compression ratio and increases the size of the initramfs image.
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if ! $MKDUMPRD "$FADUMP_INITRD" -i "$MKFADUMPRD_TMPDIR/fadump.initramfs" /etc/fadump.initramfs --omit squash; then
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perror_exit "mkfadumprd: failed to build image with dump capture support"
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fi
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### Unpack the initramfs having dump capture capability
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mkdir -p "$MKFADUMPRD_TMPDIR/fadumproot"
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if ! (pushd "$MKFADUMPRD_TMPDIR/fadumproot" > /dev/null && lsinitrd --unpack "$FADUMP_INITRD" &&
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popd > /dev/null); then
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derror "mkfadumprd: failed to unpack '$MKFADUMPRD_TMPDIR'"
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exit 1
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fi
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### Pack it into the normal boot initramfs with zz-fadumpinit module
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_dracut_isolate_args=(
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--rebuild "$REBUILD_INITRD" --add zz-fadumpinit
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-i "$MKFADUMPRD_TMPDIR/fadumproot" /fadumproot
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-i "$MKFADUMPRD_TMPDIR/fadumproot/usr/lib/dracut/hostonly-kernel-modules.txt"
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/usr/lib/dracut/fadump-kernel-modules.txt
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)
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# Same as setting zstd in mkdumprd
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if ! have_compression_in_dracut_args; then
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if is_squash_available && dracut_have_option "--squash-compressor"; then
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_dracut_isolate_args+=(--squash-compressor zstd)
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elif is_zstd_command_available; then
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_dracut_isolate_args+=(--compress zstd)
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fi
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fi
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if ! dracut --force --quiet "${_dracut_isolate_args[@]}" "$@" "$TARGET_INITRD"; then
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perror_exit "mkfadumprd: failed to setup '$TARGET_INITRD' with dump capture capability"
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fi
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