f33c99e347
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>
77 lines
2.8 KiB
Bash
77 lines
2.8 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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# Don't compress the capture image as uncompressed image is needed immediately.
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# Also, early microcode would not be needed here.
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if ! $MKDUMPRD "$FADUMP_INITRD" -i "$MKFADUMPRD_TMPDIR/fadump.initramfs" /etc/fadump.initramfs --omit squash --no-compress --no-early-microcode; then
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perror_exit "mkfadumprd: failed to build image with dump capture support"
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fi
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### Unpack the initramfs having dump capture capability retaining previous file modification time.
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# This helps in saving space by hardlinking identical files.
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mkdir -p "$MKFADUMPRD_TMPDIR/fadumproot"
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if ! cpio -id --preserve-modification-time --quiet -D "$MKFADUMPRD_TMPDIR/fadumproot" < "$FADUMP_INITRD"; 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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