/usr/lib/fai/mkramdisk is in fai-client 3.4.8ubuntu5.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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#*********************************************************************
#
# mkramdisk -- mount a ramdisk on top of a directory
#
# This script is part of FAI (Fully Automatic Installation)
# (c) 2003-2010 by Thomas Lange, lange@informatik.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: $1 is not a directory. Cannot make it writeable."
return
fi
echo
set -e
local tmp1=$(mktemp) || exit 12
tar -C $1 -cf $tmp1 .
mount $2 $3 -t tmpfs tmpfs $1 || exit 13
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
disk=$1
ram=${disk}-in-ramdisk
# test, if a ramdisk is mounted to this directory
mount | grep -q " $1 type tmpfs"
if [ $? -eq 1 ]; then
echo "$d is not a mounted ramdisk."
return
fi
set -e
mkdir $ram
mount --move $disk $ram # move current ramdisk to a new location
rm -rf $disk
cp -a $ram $disk # copy ramdisk contents to disk
umount $ram
echo "Ramdisk on $d 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))
if [ -n "$FAI_NORAMDISK" ]; then
echo "The use of \$FAI_NORAMDISK is now deprecated. Please use \$FAI_RAMDISKS instead."
exit 99
fi
# set default dirs if FAI_RAMDISKS not already set
: ${FAI_RAMDISKS:="$target/var/lib/dpkg"}
# 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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