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# Purpose of the script is to get the COPY_KERNEL_PARAMETERS on the current system
# to be used in the rescue/recovery system via automated update of KERNEL_CMDLINE.
# Also protect the rescue/recovery system by removing net.ifnames=0 from KERNEL_CMDLINE
# if net.ifnames=0 is in KERNEL_CMDLINE but persistent network interface naming is used:
local persistent_naming='no'
is_persistent_ethernet_name $( ip route | awk '$2 == "dev" && $8 == "src" { print $3 }' | sort -u | head -n1 ) && persistent_naming='yes'
# Scan current kernel cmdline for options in COPY_KERNEL_PARAMETERS to be included in KERNEL_CMDLINE:
local current_kernel_option
local new_kernel_options_to_add=()
for current_kernel_option in $( cat /proc/cmdline ) ; do
# Get the current kernel option name (part before leftmost "=") and
# add the whole option (with value) to new_kernel_options_to_add array
# if the option name is part of COPY_KERNEL_PARAMETERS array:
if IsInArray "${current_kernel_option%%=*}" "${COPY_KERNEL_PARAMETERS[@]}" ; then
new_kernel_options_to_add+=( "$current_kernel_option" )
fi
done
# Check if the kernel options we want to add to KERNEL_CMDLINE are already set by the user in KERNEL_CMDLINE.
# If yes, the user setting has priority and superseds the kernel option from the current system.
# For the check use the existing KERNEL_CMDLINE when this script is started
# and not the modified KERNEL_CMDLINE with already added kernel options
# to make it possible to add several kernel options by this script
# with same kernel option keyword like console=ttyS0,9600 console=tty0
# see https://github.com/rear/rear/pull/2749#issuecomment-1197843273
# and https://github.com/rear/rear/pull/2844
local existing_kernel_cmdline="$KERNEL_CMDLINE"
local existing_kernel_option new_kernel_option new_kernel_option_keyword
for new_kernel_option in "${new_kernel_options_to_add[@]}" ; do
new_kernel_option_keyword="${new_kernel_option%%=*}"
for existing_kernel_option in $existing_kernel_cmdline ; do
if test "$new_kernel_option_keyword" = "${existing_kernel_option%%=*}" ; then
LogPrint "Not adding '$new_kernel_option' (superseded by existing '$existing_kernel_option' in KERNEL_CMDLINE)"
# Continue with the next new_kernel_option (i.e. continue the outer 'for' loop):
continue 2
fi
done
# If we are using persistent naming do not add net.ifnames to KERNEL_CMDLINE
# see https://github.com/rear/rear/pull/1874
# and continue with the next new_kernel_option:
if test "net.ifnames" = "$new_kernel_option_keyword" ; then
if is_true $persistent_naming ; then
LogPrint "Not adding '$new_kernel_option' (persistent network interface naming is used)"
continue
fi
fi
LogPrint "Adding '$new_kernel_option' to KERNEL_CMDLINE"
KERNEL_CMDLINE+=" $new_kernel_option"
done
# The user may have added 'net.ifnames=0' to KERNEL_CMDLINE in /etc/rear/local.conf
# but he may not know whether or not persistent naming is used.
# So we should protect the rescue/recovery system from doing "stupid things"
# and remove 'net.ifnames=0' in a preventive way when persistent naming is used:
if is_true $persistent_naming ; then
if echo $KERNEL_CMDLINE | grep -q 'net.ifnames=0' ; then
KERNEL_CMDLINE=$( echo $KERNEL_CMDLINE | sed -e 's/net.ifnames=0//' )
LogPrint "Removed 'net.ifnames=0' from KERNEL_CMDLINE (persistent network interface naming is used)"
fi
fi
| Name | Type | Size | Permission | Actions |
|---|---|---|---|---|
| 220_load_modules_from_initrd.sh | File | 1.3 KB | 0644 |
|
| 230_storage_and_network_modules.sh | File | 1.7 KB | 0644 |
|
| 240_kernel_modules.sh | File | 1.08 KB | 0644 |
|
| 250_udev.sh | File | 449 B | 0644 |
|
| 260_collect_initrd_modules.sh | File | 295 B | 0644 |
|
| 260_storage_drivers.sh | File | 114 B | 0644 |
|
| 290_kernel_cmdline.sh | File | 3.43 KB | 0644 |
|
| 295_configure_ramdisk_rootfs.sh | File | 542 B | 0644 |
|
| 300_dns.sh | File | 267 B | 0644 |
|
| 310_network_devices.sh | File | 36.46 KB | 0644 |
|
| 320_inet6.sh | File | 121 B | 0644 |
|
| 350_routing.sh | File | 3.65 KB | 0644 |
|
| 390_check_usb_modules.sh | File | 270 B | 0644 |
|
| 410_use_xen_console.sh | File | 222 B | 0644 |
|
| 500_clone_keyboard_mappings.sh | File | 6.97 KB | 0644 |
|
| 550_copy_ldconfig.sh | File | 307 B | 0644 |
|
| 950_cfg2html.sh | File | 1 KB | 0644 |
|
| 960_collect_MC_serviceguard_infos.sh | File | 1.12 KB | 0644 |
|
| 990_sysreqs.sh | File | 3.91 KB | 0644 |
|