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#!/bin/bash
#
# Generates xendomains unit
#
read_conf_from_file() {
${sbindir}/xl create --quiet --dryrun --defconfig "$1"
}
big2littleendian_32bit(){
echo ${1:6:2}${1:4:2}${1:2:2}${1:0:2}
}
read_hex() {
local out_var=$1; shift
local input=$1; shift
local pos_var=$1; shift
local length=$1; shift
local hex=$(dd bs=1 skip=${!pos_var} count=$length status=none <$input | xxd -p -c$length -l$length)
read -r $pos_var <<<"$((${!pos_var} + $length))"
read -r $out_var <<<"$hex"
}
hex2dec() {
local hex=$1; shift
local little_endian=$1; shift
if $little_endian; then
hex=$(big2littleendian_32bit $hex)
fi
echo $((0x$hex))
}
read_conf_from_image(){
local pos=0 length=0
local magic_header byte_order mandatory_flags optional_flags optional_data_len config_len config_json
read_hex magic_header $1 pos 32
# "Xen saved domain, xl format\n \0 \r"
if [ "$magic_header" != "58656e20736176656420646f6d61696e2c20786c20666f726d61740a2000200d" ]; then
log $err "Unknown file format in $1. Wrong magic header: '0x$magic_header'"
return 1
fi
read_hex byte_order $1 pos 4
case "$byte_order" in
04030201) little_endian=true;;
01020304) little_endian=false;;
*) log $err "Unknown byte order 0x$byte_order in $1"; return 1;;
esac
#define XL_MANDATORY_FLAG_JSON (1U << 0) /* config data is in JSON format */
#define XL_MANDATORY_FLAG_STREAMv2 (1U << 1) /* stream is v2 */
read_hex mandatory_flags $1 pos 4
if [ "$(($(hex2dec $mandatory_flags $little_endian) & 0x3))" -ne 3 ]; then
log $err "Unknown config format or stream version. Mandatory flags are 0x$mandatory_flag"
return 1
fi
read_hex optional_flags $1 pos 4
read_hex optional_data_len $1 pos 4
optional_data_len=$(hex2dec $optional_data_len $little_endian)
# I'll not use but saved memory dump will begin at $((pos+optional_data_len))
read_hex config_len $1 pos 4
config_len=$(hex2dec $config_len $little_endian)
# null terminated string
read_hex config_json $1 pos $config_len
xxd -p -r <<<"$config_json"
}
log() {
local msg_loglevel=$1; shift
if [ "$msg_loglevel" -gt "$LOGLEVEL" ]; then
return 0
fi
echo "$@" >&2
}
emerg=0; alert=1; crit=2; err=3
warning=4; notice=5; info=6; debug=7
LOGLEVEL=${LOGLEVEL:-4}
if [ "$SYSTEMD_LOG_LEVEL" ]; then
LOGLEVEL=${!SYSTEMD_LOG_LEVEL}
fi
log $debug "Using loglevel $LOGLEVEL"
trap "log $err Error on \$LINENO: \$(caller)" ERR
log $debug "loading /etc/xen/scripts/hotplugpath.sh..."
. /etc/xen/scripts/hotplugpath.sh
#log $debug "testing for ${sbindir}/xl..."
#CMD=${sbindir}/xl
#if ! $CMD list &> /dev/null; then
# log $err "${sbindir}/xl list failed!"
# log $err "$($CMD list &>&1)"
# exit $?
#fi
#log $debug "${sbindir}/xl list OK!"
log $debug "loading /etc/sysconfig/xendomains..."
XENDOM_CONFIG=/etc/sysconfig/xendomains
if ! test -r $XENDOM_CONFIG; then
echo "$XENDOM_CONFIG not existing" >&2;
exit 6
fi
. $XENDOM_CONFIG
doms_conf=()
doms_restore=()
doms_source=()
log $debug "Reading saved domains..."
if [ "$XENDOMAINS_RESTORE" = "true" ] && [ -d "$XENDOMAINS_SAVE" ]; then
for dom in $XENDOMAINS_SAVE/*; do
log $debug "Trying $dom..."
if ! [ -r $dom ] ; then
log $debug "Not readable $dom..."
continue
fi
log $debug "Reading conf from $dom..."
if ! dom_conf=$(read_conf_from_image $dom); then
log $error "Cannot read conf from $dom"
continue
fi
log $debug "Adding $dom to the list"
doms_conf+=("$dom_conf")
doms_restore+=(true)
doms_source+=("$dom")
done
fi
log $debug "Reading auto domains..."
if [ -d "$XENDOMAINS_AUTO" ]; then
for dom in $XENDOMAINS_AUTO/*; do
log $debug "Trying $dom..."
if ! [ -r $dom ] ; then
log $debug "Not readable $dom..."
continue
fi
log $debug "Reading conf from $dom..."
if ! dom_conf=$(read_conf_from_file $dom); then
echo 123
log $error "Cannot read conf from $dom"
continue
fi
log $debug "Adding $dom to the list"
doms_conf+=("$dom_conf")
doms_restore+=(false)
doms_source+=("$dom")
done
fi
log $debug "We have ${#doms_conf[*]} to check"
for i in ${!doms_conf[*]}; do
log $debug "Doing dom $i..."
dom_conf="${doms_conf[i]}"
dom_restore="${doms_restore[i]}"
dom_source="${doms_source[i]}"
dom_name=$(sed -n 's/^.*(name \(.*\))$/\1/p;s/^.*"name": "\(.*\)",$/\1/p' <<<"$dom_conf")
readarray -t required_disks <<<"$(sed -n -e '/^ "disks": \[/,/ \],/{ /"pdev_path":/ { s/.*"pdev_path": "//;s/".*//p } }' <<<"$dom_conf")"
log $debug "dom $i is named $dom_name..."
for disk in "${required_disks[@]}"; do
disk_control_var=control_$(tr -d -c '[a-zA-Z0-9_]' <<<"$disk")
if [ "${!disk_control_var:-0}" -eq 1 ]; then
log $debug "$disk for $dom_name is already being checked"
continue
fi
declare $disk_control_var=1
log $debug "waiting for $disk for $dom_name"
(
j=0 found_loglevel=$debug
while true; do
if [ -e "$disk" ]; then
log $found_loglevel "disk $disk found (after $j seconds)"
exit 0
fi
if [ "$(( j++ % 5))" -eq 0 ]; then
log $warning "still waiting for $disk for $dom_name..."
found_loglevel=$warning
fi
sleep 1
done
) &
done
done
wait
log $debug "Exiting normally"
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