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|
#!/bin/sh
VSYSROOT=/OS
function create_vsys()
{
sys="$1"
# Create the virtual system directory and mount point
mkdir -p "$VSYSROOT/$sys/..." > /dev/null 2>&1
# Move to the virtual system directory
cd "$VSYSROOT/$sys"
# Mount the remote filesystem tree.
showmount --no-headers -e "$sys" | while read fs
do
set -- $fs
mount "$sys:$1" "...$1"
done
# Map names from the mount point to the virtual system directory.
for i in .../*
do
# Don't map ..., tmp, dev or usr
if [ "$i" = ".../..." -o "$i" = ".../tmp" -o "$i" = ".../dev" -o "$i" = ".../usr" ]; then
continue
else
rm -f `basename "$i"`
ln -s "$i" `basename "$i"`
fi
done
# Map /usr too. We have to do this since /usr/tmp needs to be local.
rm -f usr > /dev/null 2>&1
mkdir usr > /dev/null 2>&1
cd usr
for i in ../.../usr/*
do
# Don't map tmp
if [ "$i" = "../.../usr/tmp" ]; then
continue
else
rm -f `basename "$i"`
ln -s "$i" `basename "$i"`
fi
done
cd ..
# Make the local directories
rm -f dev > /dev/null 2>&1
mkdir tmp usr/tmp dev > /dev/null 2>&1
chmod a=rwx,+t tmp usr/tmp
cp -dpR /dev . > /dev/null 2>&1
# And connect the access program for the virtual system
cd $VSYSROOT/bin
ln -sf bin "$sys"
}
function destroy_vsys()
{
vsys="$1"
# If it's a symlink just get rid of it and the associated program.
if [ -L "$VSYSROOT/$vsys" ]; then
rm -f $VSYSROOT/$vsys
rm -f $VSYSROOT/bin/$vsys
fi
# If it isn't a directory or it hasn't got a ... subdirectory
# it isn't a virtual system.
if [ ! -d "$VSYSROOT/$vsys" -o ! -d "$VSYSROOT/$vsys/..." ]; then
echo "$vsys is not a virtual system"
exit 1
fi
# Unmount anything mounted for this virtual system.
awk '{ print $2 }' /etc/mtab | grep "^$VSYSROOT/$vsys/..." | sort -r | while read fs
do
umount "$fs"
done
# Remove the virtual system tree. Avoid removing anything below
# anything starting with . (specifically ... in case anything
# has failed to unmount - we don't symlink dor files in the
# root directory anyway).
rm -rf $VSYSROOT/$vsys/*
rmdir $VSYSROOT/$vsys/...
rmdir $VSYSROOT/$vsys
# Remove the associated program.
rm -f $VSYSROOT/bin/$vsys
}
function alias_vsys()
{
alias="$1"
vsys="$2"
cd $VSYSROOT
# If the alias already exists as a link get rid of it.
if [ -L "$alias" ]; then
rm -f "$alias"
fi
# If the alias already exists or the virtual system doesn't
# exist we can't do this.
if [ -e "$alias" ]; then
echo "$alias already exists"
elif [ ! -d "$vsys" -a ! -L "$vsys" ]; then
echo "Virtual system $vsys does not exist"
else
ln -s "$vsys" "$alias"
cd bin
rm -f "$alias"
ln bin "$alias"
fi
}
function usage()
{
echo "usage: mkvsys [ -r vsysroot ] Set the vsys root (default /OS)"
echo " [ -a alias real ] Add an alias for the given system"
echo " [ -c system ] Create the specified virtual system"
echo " [ -d system ] Destroy the specified virtual system or alias"
}
if [ $# -eq 0 ]; then
usage
exit 1
fi
while [ $# -gt 0 ]
do
case "$1" in
-r)
if [ $# -eq 1 ]; then
usage
exit 1
fi
VSYSROOT="$2"
shift ; shift
;;
-c)
if [ $# -eq 1 ]; then
usage
exit 1
fi
create_vsys "$2"
shift ; shift
;;
-d)
if [ $# -eq 1 ]; then
usage
exit 1
fi
destroy_vsys "$2"
shift ; shift
;;
-a)
if [ $# -eq 1 ]; then
usage
exit 1
fi
alias_vsys "$2" "$3"
shift ; shift ; shift
;;
*)
usage
exit 1
;;
esac
done
|
