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|
#! /bin/sh
# Detect iSCSI devices and leave notes about them for later. Ideally, udev
# would do most of this for us ...
. /lib/partman/lib/base.sh
# We can't work any of this out without udevadm.
type udevadm >/dev/null 2>&1 || exit 0
cat_null () {
local text="$(cat "$1")"
if [ "$text" != "<NULL>" ]; then
echo "$text"
fi
}
for dev in $DEVICES/*; do
[ -d "$dev" ] || continue
cd "$dev"
rm -f iscsi_portal iscsi_target \
iscsi_username iscsi_password \
iscsi_username_in iscsi_password_in
devnode="$(cat device 2>/dev/null)" || continue
devpath="$(udevadm info -n "$devnode" -q property | sed -n 's/^DEVPATH=//p')" || continue
[ "$devpath" ] || continue
parent="$devpath"
while :; do
parent="${parent%/*}"
[ "$parent" ] || break
[ -L "/sys/$parent/subsystem" ] || continue
subsys="$(readlink "/sys/$parent/subsystem")"
subsys="${subsys##*/}"
if [ "$subsys" = scsi ]; then
devtype="$(sed -n 's/^DEVTYPE=//p' /sys/$parent/uevent)" || continue
[ "$devtype" = scsi_device ] || continue
# We found a SCSI device. Now, is it iSCSI?
echo "/sys/$parent" | grep -q /session || continue
# Look for the iSCSI transport device.
transportdev="$parent"
while :; do
transportdev="${transportdev%/*}"
[ "$transportdev" ] || break
sysname="${transportdev##*/}"
if [ "${sysname#session}" != "$sysname" ]; then
break
fi
done
[ "$transportdev" ] || continue
# Confirm that it's really iSCSI: look for the session.
sessiondev=
for trydev in "subsystem/iscsi_session/$sysname/devices" \
"bus/iscsi_session/$sysname/devices" \
"class/iscsi_session/$sysname"; do
if [ -e "/sys/$trydev" ]; then
sessiondev="$trydev"
break
fi
done
[ "$sessiondev" ] || continue
# Look for the portal.
connectiondev="/sys/$transportdev"
while [ ! -f "$connectiondev/persistent_address" ]; do
for trydev in "$connectiondev"/*; do
[ -d "$trydev" ] || continue
trydev="${trydev##*/}"
if [ "${trydev#connection*}" != "$trydev" ] || \
[ "$trydev" = iscsi_connection ]; then
connectiondev="$connectiondev/$trydev"
continue 2
fi
done
break
done
if [ -f "$connectiondev/persistent_address" ]; then
# Hooray!
echo "$(cat "$connectiondev/persistent_address"):$(cat "$connectiondev/persistent_port"),$(cat "/sys/$sessiondev/tpgt")" >iscsi_portal
cat "/sys/$sessiondev/targetname" >iscsi_target
cat_null "/sys/$sessiondev/username" >iscsi_username
cat_null "/sys/$sessiondev/password" >iscsi_password
cat_null "/sys/$sessiondev/username_in" >iscsi_username_in
cat_null "/sys/$sessiondev/password_in" >iscsi_password_in
chmod 600 iscsi_password iscsi_password_in
break
fi
fi
done
done
exit 0
|
