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https://github.com/ibm-s390-linux/s390-tools.git
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eb0dc13c88
Since version 198 (Feb 2013) systemd contains kernel-install, a script managing kernel installs. This script allows execution of drop-in scripts for customization. Add such a drop-in script to s390-tools to handle the installation of zfcpdump kernels. It's main purpose is to manage a link to the latest installed zfcpudump kernel at ZFCPDUMP_IMAGE, where zipl expects to find the image to install for a SCSI dumper. The script supports two installation modes. One recommended by the BootLoaderSpecs [1] to /boot/<machine-id>/<kernel-version> directories and one directly to /boot. In the second case files are renamed during installation to <original-name>-<kernel-version> to guarantee unique names. Because the zfcpdump kernel is so special make the script stand-alone and prevent any other script from being executed (exit 77) when a zfcpdump is installed. Especially avoid functionality like creating an initrd (already provided by s390-tools) or creating a boot entry (the zfcpdump kernel should not be used for any other purpose than dumping). The script requires systemd >= 203. [1] https://www.freedesktop.org/wiki/Specifications/BootLoaderSpec/ Signed-off-by: Philipp Rudo <prudo@linux.ibm.com> Reviewed-by: Hendrik Brueckner <brueckner@linux.ibm.com> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
115 lines
3.0 KiB
Bash
Executable File
115 lines
3.0 KiB
Bash
Executable File
#!/bin/bash
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#
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# 10-zfcpdump.install - Installation script to handle zfcpdump kernels
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#
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# Copyright IBM Corp. 2018
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#
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# s390-tools is free software; you can redistribute it and/or modify
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# it under the terms of the MIT license. See LICENSE for details.
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#
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#
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# This script supports two modes:
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#
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# 1) Installing the images to /boot/<machine-id>/<kernel-version>
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# subdirectories, i.e. BOOT_DIR_ABS, as recommended by the BLS.
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# In this case file names are taken over from the original files.
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#
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# 2) Installing the images directly to /boot. In this case the files are
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# renamed to <original-name>-<kernel-version>.
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#
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# The existence of BOOT_DIR_ABS is taken as trigger to switch between both
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# modes.
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#
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# The KERNEL_VERSION is assumed to contain '@flavor@' to identify the image
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# as a zfcpdump kernel.
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COMMAND="$1"
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KERNEL_VERSION="$2"
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BOOT_DIR_ABS="$3"
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KERNEL_IMAGE="$4"
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# Location zipl looks for the zfcpdump kernel
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ZFCPDUMP_IMAGE='@zfcpdump_image@'
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# Only handle zfcpdump kernels
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echo "$KERNEL_VERSION" | grep -q '@flavor@' || exit 0
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case "$COMMAND" in
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add)
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KERNEL_DIR="$(dirname $KERNEL_IMAGE)"
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KERNEL_NAME="$(basename $KERNEL_IMAGE)"
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for f in \
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"$KERNEL_IMAGE" \
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"$KERNEL_DIR"/System.map \
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"$KERNEL_DIR"/config \
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"$KERNEL_DIR"/zImage.stub
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do
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test -e "$f" || continue
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test -d "$BOOT_DIR_ABS" \
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&& DEST="$BOOT_DIR_ABS/$(basename $f)" \
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|| DEST="/boot/$(basename $f)-$KERNEL_VERSION"
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cp -aT "$f" "$DEST"
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test $(command -v restorecon) && restorecon -R "$DEST"
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done
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# hmac file need special treatment
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f="$KERNEL_DIR/.$KERNEL_NAME.hmac"
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if [ -e "$f" ]; then
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test -d "$BOOT_DIR_ABS" \
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&& DEST="$BOOT_DIR_ABS/$(basename $f)" \
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|| DEST="/boot/.$KERNEL_NAME-$KERNEL_VERSION.hmac"
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cp -aT "$f" "$DEST"
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test $(command -v restorecon) && restorecon -R "$DEST"
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fi
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# Set link so zipl finds the kernel
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test -d "$BOOT_DIR_ABS" \
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&& TARGET="$BOOT_DIR_ABS/$KERNEL_NAME" \
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|| TARGET="/boot/$KERNEL_NAME-$KERNEL_VERSION"
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ln -sf "$TARGET" "$ZFCPDUMP_IMAGE"
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;;
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remove)
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# On removal
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# $KERNEL_IMAGE is empty -> $KERNEL_NAME is empty -> rebuild it
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KERNEL_NAME="$(basename $(readlink $ZFCPDUMP_IMAGE))"
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if [ -d "$BOOT_DIR_ABS" ]; then
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INSTALL_DIR="$(dirname $BOOT_DIR_ABS)"
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else
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INSTALL_DIR="/boot/"
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KERNEL_NAME="$(echo $KERNEL_NAME \
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| sed -e "s#\(.*\)-$KERNEL_VERSION#\1#")"
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fi
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for f in $(find "$INSTALL_DIR" -name "*$KERNEL_VERSION*"); do
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rm -rf "$f"
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done
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# Update link to latest remaining zfcpdump kernel.
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if [ $(readlink "$ZFCPDUMP_IMAGE" | grep "$KERNEL_VERSION") ]
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then
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NEXT_IMAGE=$( \
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find "$INSTALL_DIR" -type f \
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| grep '@flavor@' \
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| grep "$KERNEL_NAME" \
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| grep -v "hmac" \
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| sort -V \
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| tail -n1 )
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test $NEXT_IMAGE \
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&& ln -sf "$NEXT_IMAGE" "$ZFCPDUMP_IMAGE" \
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|| rm -f "$ZFCPDUMP_IMAGE"
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fi
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;;
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*)
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;;
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esac
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# Prevent execution of all other scripts.
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# The zfcpdump kernel is stripped down to the bare minimum needed for
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# dumping. It is not supposed to be used for any other purpose.
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exit 77
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