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#!/bin/sh
if [ -n "$EBSMOUNT_DEBUG" ]
then
do="echo"
mktemp_args="-u"
else
do=""
mktemp_args=""
fi
if [ "$#" -lt 2 ]
then
echo "Usage: $0 <EBS device> <path> [<path> [<path>...]]"
exit 1
fi
ebs_volume_device="$1"
shift
canonicalise_dir() {
dirname="$1"
echo "${dirname}" | sed -e 's/[^a-zA-Z0-9]/_/g'
}
# The blkid call will detect whether there's already a filesystem on the EBS volume
if [ -n "$(blkid -p -o udev "${ebs_volume_device}")" ]
then
$do mkfs.ext3 "${ebs_volume_device}"
fi
tmpdir="$(mktemp -d $mktemp_args --tmpdir=/var/run/ec2)"
$do mount ${ebs_volume_device} ${tmpdir}
for dir in "$@"
do
ebsdir="${tmpdir}/$(canonicalise_dir "${dir}")"
if [ ! -d "${ebsdir}" ]
then
# We bootstrap the storage with the existing data
$do mkdir "${ebsdir}"
$do cp -a ${dir} "${ebsdir}"
$do chown --reference "${dir}" "${ebsdir}"
$do chmod --reference "${dir}" "${ebsdir}"
fi
# Finally, we mount it on top of the old directory.
$do mount --bind "${ebsdir}" "${dir}"
done
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