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|
#! /bin/bash
#*********************************************************************
#
# mkramdisk -- mount a ramdisk on top of a directory
#
# This script is part of FAI (Fully Automatic Installation)
# (c) 2003-2022 by Thomas Lange, lange@cs.uni-koeln.de
# Universitaet zu Koeln
#
#*********************************************************************
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
mount_ramdisk() {
# save all dirs and files under directory $1
# mount tmpfs on top of dir $1
# extract dirs and files into tmpfs
local n=
if [ ! -d "$1" ]; then
echo "WARNING: $1 is not a directory. Cannot make it writeable." >&2
return
fi
set -e
local tmp1=$(mktemp) || exit 12
tar -C $1 -cf $tmp1 .
mount $2 $3 -onoatime,size=80% -t tmpfs tmpfs $1 || exit 13
[ X$verbose = X1 ] && echo "Ramdisk mounted onto $1"
tar -C $1 -xf $tmp1
rm -f $tmp1
set +e
}
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
umount_ramdisk() {
# put contents of ramdisk back to original location on harddisk
local disk=$(readlink -f $1)
local ram=${disk}-in-ramdisk
# test, if a ramdisk is mounted to this directory
mount | grep -q " $disk type tmpfs"
if [ $? -eq 1 ]; then
echo "$disk is not a mounted ramdisk." >&2
return
fi
set -e
mkdir $ram
# move current ramdisk to a new location
mount --bind $disk $ram
umount $disk
rm -rf ${disk:?}/* ${disk:?}/.??* || true
cp -a $ram/. $disk/. # copy ramdisk contents to disk
umount $ram
[ X$debug = X1 ] && echo "Ramdisk on $disk umounted"
rmdir $ram
set +e
}
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
size= # no default size
umount=0
useall=0
# mkramdisk
while getopts ans:u opt ; do
case "$opt" in
# -a: mount all dirs listed in FAI_RAMDISKS instead of dirs given as arguments
a) useall=1 ;;
u) umount=1 ;; # umount instead of mount
s) size="-o size=$OPTARG" ;; # give size of ramdisk
n) mtab="-n" ;; # do not wirte to /etc/mtab
esac
done
shift $((OPTIND - 1))
# use arguments $@ unless -a was specified
[ $useall -eq 0 ] && FAI_RAMDISKS=$@
for d in $FAI_RAMDISKS; do
if [ $umount -eq 1 ]; then
umount_ramdisk $d
else
[ -d "$d" ] && mount_ramdisk $d $size $mtab
fi
done
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