/usr/share/initramfs-tools/scripts/local-top/nbd is in nbd-client 1:3.13-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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# We don't have any prerequisites
case $1 in
prereqs)
exit 0
;;
esac
for x in $(cat /proc/cmdline); do
case "$x" in
nbddev=*)
nbddev="${x#nbddev=}"
;;
nbdroot=*)
nbdroot="${x#nbdroot=}"
;;
root=/dev/nbd*)
nbddev="${x#root=}"
;;
esac
done
# if nbd root is not requested exit early and silently
if [ -z "$nbdroot" ] && [ -z "$nbddev" ]
then
exit 0
fi
. /scripts/functions
log_begin_msg "Setting up nbd-client"
modprobe nbd
wait_for_udev
configure_networking
# Support setting stuff using DHCP by overloading 'option root-path'
case "$nbdroot" in
''|dhcp)
nbdroot=$ROOTPATH
;;
esac
nbdrootdev="$nbddev"
nbdbasedev="${nbddev#/dev/}"
case "$nbdroot" in
*,*,*)
nbdsrv="${nbdroot%%,*}"
nbdpath="${nbdroot%,*}"
nbdpath="${nbdpath##*,}"
# root= parameter overrides three-option nbdroot= parameter
if [ -z "$nbdrootdev" ]
then
nbdbasedev="${nbdroot##*,}"
nbdrootdev=/dev/$nbdbasedev
fi
;;
*,*)
nbdsrv="${nbdroot%,*}"
nbdport="${nbdroot#*,}"
;;
\[*\]*)
# [ipv6]:port/path
nbdsrv=${nbdroot%\]*}
nbdsrv=${nbdsrv#\[}
nbdportpath=${nbdroot#\[$nbdsrv\]}
nbdportpath=${nbdportpath#:}
nbdport=${nbdportpath%%/*}
nbdpath=${nbdportpath#$nbdport}
;;
*)
# ipv4:port/path
nbdsrv=${nbdroot%%[:/]*}
nbdportpath=${nbdroot#$nbdsrv}
nbdportpath=${nbdportpath#:}
nbdport=${nbdportpath%%/*}
nbdpath=${nbdportpath#$nbdport}
;;
esac
nbdrootdev=${nbdrootdev%p*}
nbdbasedev=${nbdbasedev%p*}
# If host is omitted, use ROOTSERVER from DHCP.
case "$nbdsrv" in
''|dhcp)
nbdsrv=$ROOTSERVER
;;
esac
if [ -z "$nbdsrv" ] || [ -z "$nbdrootdev" ] || [ -z "$nbdpath" ]
then
log_failure_msg "Insufficient information to set up nbd, quitting (nbdroot=$nbdroot, host=$nbdsrv, name=$nbdpath, port=$nbdport, nbd-device=$nbdrootdev)"
exit 0
fi
# Support defining an alternate launch script with env variable NBDCLIENT.
NBDCLIENT=${NBDCLIENT:-/sbin/nbd-client}
$NBDCLIENT $nbdsrv -N $nbdpath $nbdport $nbdrootdev -swap -persist -systemd-mark
# This should be removed once the cfq scheduler no longer deadlocks nbd
# devices
if grep -q '\[cfq\]' /sys/block/$nbdbasedev/queue/scheduler
then
echo deadline > /sys/block/$nbdbasedev/queue/scheduler
fi
|