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#!/bin/bash
###########################################
# Include: Set hardware related variables #
###########################################
# New way of handling MAC address prefixes to support
# nested and concurrent run-virt invocations.
# Using a list of predefined MAC prefixes to use for VMs,
# check if the host's MAC address prefix is in that list.
# If not, use the first prefix in the list. If it is
# use the next prefix in the list. If the host's prefix
# is the last in the list, use the first one again.
# This way we support up to 10 nested/concurrent VMs.
# Use: 00:FF:00 for firtual machines ;)
## Functions ##
# Import /run/hwinfo variables
import_hwinfo() {
$(safesource "/run/hwinfo")
}
# Sets the VM's hostname to the original hostname prefixed with a fixed string and its ID
set_virt_hostname() {
declare -rg HOSTNAME="virt${VM_ID}-$(hostname)"
writelog "\tVM Hostname:\t\t$HOSTNAME"
}
# Derives the amount of memory allocated to the VM from the
# host's total memory (previously determined by systemd-run_virt_env)
set_virt_memory() {
# Make sure we have a VM_ID and HOST_MEM_TOTAL (read from virtualization.conf)
if isempty HOST_MEM_TOTAL; then
writelog "HOST_MEM_TOTAL is empty! Was '$VMCHOOSER_CONF_DIR/virtualization.conf' sourced?"
EXIT_TYPE="internal" EXIT_REASON="Konnte die Größe des Arbeitsspeichers nicht ermitteln!" cleanexit 1
fi
# Calculare amount of memory for the VM. Be generous if diff is written to HDD.
# First, determine how much should be left to the host system. Minimum is 1GB.
local min=1024
local reserve max
if $TMPDIR_IN_RAM; then
# tmp in RAM, so reserve a lot for the system since that is where the HDD diff goes.
reserve=65
max=8192 # But max. 8GB
else
# We have a backing store for the HDD diff, be generous
if lsmod | grep -q '^nvidia'; then
# With nvidia cards, the host needs a bit more RAM.
max=2800
reserve=28
else
max=1800
reserve=21
fi
fi
# Calculate absulute amount of RAM that should stay available to the host
reserve="$(( ( HOST_MEM_TOTAL * reserve ) / 100 ))"
# Respect some upper and lower bounds for the host amount
[ "$reserve" -lt "$min" ] && reserve="$min"
[ "$reserve" -gt "$max" ] && reserve="$max"
# Get a result which can be divided by 4
declare -g VM_MEM="$(( ( ( HOST_MEM_TOTAL - reserve ) / 4 ) * 4 ))"
declare -g HOST_MEM_REMAINING="$(( HOST_MEM_TOTAL - VM_MEM ))"
# NOTE: removed old code that evaluated 'mainvirtmem'
# as it did nothing and we don't know what the idea was...
}
# New way to generate MAC addresses:
# MAC_PREFIXES is a statically declared list of prefixes which
# can be used for VMs. To support nested VMs, we just look for
# the MAC prefix of the host and if it is present in the list,
# we just take the next one in the list. Currently support up to 10.
# If none are found, we just take the first prefix.
# Suffix template is taken from /opt/openslx/vmchooser/config/virtualization.conf
# and will have the VMID inserted as first byte.
set_virt_mac() {
local i mac byte
# First, determine prefix of the host's MAC address
isset HOSTMACADDR || writelog "Host's MAC address was not defined in ${VMCHOOSER_CONF_DIR}/virtualizer.conf"
isset MACADDRPREFIX || writelog "No MAC address prefix was defined in ${VMCHOOSER_CONF_DIR}/virtualizer.conf"
# Fill in VM_ID
local MACADDRSUFFIX=${MACADDRSUFFIX//%VMID%/"${VM_ID}"}
if ! echo "$MACADDRPREFIX" | grep -q -E '^[0-9A-F]{2}:[0-9A-F]{2}:[0-9A-F]{2}$'; then
slxlog "virt-mac" "Could not properly generate mac address prefix (got $MACADDRPREFIX)"
fi
if ! echo "$MACADDRSUFFIX" | grep -q -E '^[0-9A-F]{2}:[0-9A-F]{2}:[0-9A-F]{2}$'; then
slxlog "virt-mac" "Could not properly generate mac address suffix (got $MACADDRSUFFIX)"
fi
declare -g VM_MAC_ADDR="$MACADDRPREFIX:$MACADDRSUFFIX"
declare -g OTHER_NICS=
# Set up additional NICs if enabled
if [ "$SLX_BRIDGE_OTHER_NICS" = "yes" ]; then
for i in /sys/class/net/br-nic-*/address; do
[ -s "$i" ] || continue
mac=$(tr '[a-f]' '[A-F]' < "$i")
# Calc checksum of mac by summing the bytes mod 256
byte=$(( $(<<<$mac sed 's/^/ ( 0x/;s/:/ + 0x/g;s/$/ ) % 256/') ))
byte=$(printf "%02X" "$byte")
# (PR:EF:IX):LA:ST:CH - use general prefix for VMs, then last two octets of source mac, plus the checksum
mac="${MACADDRPREFIX}:${mac:12:5}:${byte}"
OTHER_NICS+=" $mac"
done
fi
}
# Virtual fd/cd/dvd and drive devices, floppy b: for configuration
# If the variables in virtualization.conf is set, "TRUE" is assigned,
# "FALSE" otherwise.
check_optical_drives() {
# TODO This should only handle exam mode here, maybe even have one function
# that prepares all exam mode related stuff. Then create the TRUE/FALSE
# variables somewhere in the vmware plugin, since it's specific to that
# plugin.
FLOPPY0="FALSE"
CDROM0="FALSE"
CDROM1="FALSE"
if [ -z "$SLX_EXAM" ]; then
if [ -n "$FLOPPY_0" ]; then
FLOPPY0="TRUE"
fi
if [ -n "$CDROM_0" ]; then
CDROM0="TRUE"
fi
if [ -n "$CDROM_1" ]; then
CDROM1="TRUE"
fi
fi
readonly FLOPPY0 CDROM0 CDROM1
}
# Dynamically detect serial ports here instead of at boot time
# (virtualization.conf), since USB serial ports get quite common
# and might not be plugged in at boot time yet
set_serial_ports() {
declare -g SERIAL0=
#for port in $(awk '{ if ($1 ~ /^[0-9]+:/ && $2 != "uart:unknown") print "/dev/ttyS" sub(/:\$/, "", $1) }' /proc/tty/driver/serial); do
for PORT in $SERIAL_PORTS /dev/ttyUSB*; do
[ -c "$PORT" ] || continue
SERIAL0="$PORT"
break
done
declare -g PARALLEL0=
for PORT in /dev/parport*; do
[ -c "$PORT" ] || continue
PARALLEL0="$PORT"
break
done
readonly SERIAL0 PARALLEL0
}
## MAIN ##
call_post_source \
import_hwinfo \
set_virt_memory \
set_virt_mac \
set_virt_hostname \
set_serial_ports \
check_optical_drives
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