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zdev: add helper to convert from zdev config to rd.znet

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Converts zdev configuration into the syntax of the dracut cmdline option
rd.znet. Only znet options with non-default values are emitted. The result
string occurs on stdout. It represents one device-specification for the
given network interface name.

Example:
/lib/s390-tools/zdev-to-rd.znet persistent encbdf0
qeth,0.0.bdf0,0.0.bdf1,0.0.bdf2,layer2=1

User:
https://github.com/rhinstaller/anaconda/pull/5250
to generate dracut cmdline entries such as
rd.znet=qeth,0.0.bdf0,0.0.bdf1,0.0.bdf2,layer2=1

Github-ID: https://github.com/ibm-s390-linux/s390-tools/pull/158
Acked-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Acked-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Steffen Maier <maier@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Steffen Maier
2023-09-06 19:01:59 +02:00
committed by Jan Höppner
parent bc4f455151
commit 73f51e45a8
2 changed files with 52 additions and 1 deletions
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4
zdev/src/Makefile
View File

@@ -106,13 +106,15 @@ libs = $(rootdir)/libap/libap.a \
chzdev: $(chzdev_objects) $(libs)
lszdev: $(lszdev_objects) $(libs)
install: chzdev zdev_id zdev-to-dasd_mod.dasd zdev-from-dasd_mod.dasd
install: chzdev zdev_id zdev-to-dasd_mod.dasd zdev-from-dasd_mod.dasd \
zdev-to-rd.znet
$(INSTALL) -d -m 755 $(DESTDIR)$(BINDIR)
$(INSTALL) -c chzdev $(DESTDIR)$(BINDIR)
$(INSTALL) -c lszdev $(DESTDIR)$(BINDIR)
$(INSTALL) -c zdev_id $(DESTDIR)$(TOOLS_LIBDIR)
$(INSTALL) -c zdev-to-dasd_mod.dasd $(DESTDIR)$(TOOLS_LIBDIR)
$(INSTALL) -c -m 644 zdev-from-dasd_mod.dasd $(DESTDIR)$(TOOLS_LIBDIR)
$(INSTALL) -c zdev-to-rd.znet $(DESTDIR)$(TOOLS_LIBDIR)
ifeq ($(HAVE_DRACUT),1)
$(INSTALL) -m 755 zdev-root-update.dracut \
$(DESTDIR)$(TOOLS_LIBDIR)/zdev-root-update

49
zdev/src/zdev-to-rd.znet Executable file
View File

@@ -0,0 +1,49 @@
#!/bin/bash
#
# Copyright IBM Corp. 2023
#
# s390-tools is free software; you can redistribute it and/or modify
# it under the terms of the MIT license. See LICENSE for details.
#
# zdev-to-rd.znet
# Converts zdev configuration into the syntax of the dracut cmdline option
# rd.znet. Only znet options with non-default values are emitted. The
# result string occurs on stdout. It represents one device-specification for
# the given network interface name.
#
function usage() {
echo "usage: ${0##*/} active|persistent <network interface name>" 1>&2
exit 1
}
[[ $# -eq 2 ]] || usage
[[ "$1" == active ]] || [[ "$1" == persistent ]] || usage
_selection="--${1}"
_ifname="$2"
while read -r _line; do
case "$_line" in
\#*) ;;
\[*)
SAVED_IFS="$IFS"
IFS="${IFS}:]"
# shellcheck disable=SC2086
set -- $_line
shift # skip "[..." prefix
_nettype="$1"
shift # skip nettype
IFS="," # comma-separated subchannel list
_subchannels="$*"
IFS="$SAVED_IFS"
;;
"online=1") ;;
zdev:early=*) ;;
*)
_attrs="${_attrs},${_line}"
;;
esac
done < <(chzdev --by-interface "$_ifname" "$_selection" --export - --quiet)
printf "%s,%s%s\n" "$_nettype" "$_subchannels" "$_attrs"