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#!/bin/sh
set -e
die()
{
printf -- "%s\n" "$*" 1>&2
exit 1
}
clone()
{
local oldname="$1"
local newname="$2"
local img="$3"
if [ -e "$img" ]
then
echo "Image file $img already exists. Skipping clone."
else
echo "Cloning $oldname to $newname"
virt-clone --connect qemu:///system -o "$oldname" -n "$newname" \
-f "$img"
chmod 770 "$img"
fi
}
fixup()
{
local oldname="$1"
local mountpt="$2"
if grep -x -e "$oldname" "$mountpt/etc/hostname" > /dev/null
then
echo "fixing up /etc/hostname on $oldname"
sed -i "s/$oldname/$newname/g" "$mountpt/etc/hostname"
echo "fixing up /etc/hosts on $oldname"
sed -i "s/$oldname/$newname/g" "$mountpt/etc/hosts"
echo "removing udev's persistent net rule"
rm -f "$mountpt/etc/udev/rules.d/70-persistent-net.rules"
else
echo "EEEK! /etc/hostname does not match $oldname"
echo "Not touching this filesystem."
echo "/etc/hostname is:"
cat $mountpt/etc/hostname
fi
}
[ $# = 2 ] || die "Usage: $0 oldname newname"
oldname="$1"
newname="$2"
img="/srv/vm/$newname.img"
clone "$oldname" "$newname" "$img"
mountpt=$(mktemp -d)
tempfile=$(mktemp)
kpartx -av "$img" > "$tempfile"
sleep 2 # FIXME: for some reasons things are not immediate
sed 's/.*(\(.*\)).*/\1/' "$tempfile" |
while read pair
do
dev="/dev/block/$pair"
if pvdisplay "$dev" > /dev/null 2>&1
then
vg=$(pvdisplay "$dev" | awk '/^ VG Name/ { print $NF }')
vgchange -ay "$vg" > /dev/null
for lv in "/dev/$vg"/*
do
if mount "$lv" "$mountpt" 2> /dev/null && [ -e "$mountpt/etc" ]
then
fixup "$oldname" "$mountpt"
umount "$mountpt"
fi
done
vgchange -an "$vg" > /dev/null
fi
done
kpartx -d "$img" > /dev/null
rm -f "$tempfile"
rmdir "$mountpt"
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