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#!/bin/sh
#
# Perform a bind mount, copying existing files as we do so to ensure the
# overlaid path has the necessary content.
if [ $# -lt 2 ]; then
echo >&2 "Usage: $0 spec mountpoint [OPTIONS]"
exit 1
fi
spec=$1
mountpoint=$2
if [ $# -gt 2 ]; then
options=$3
else
options=
fi
[ -n "$options" ] && options=",$options"
mkdir -p "${spec%/*}"
if [ -d "$mountpoint" ]; then
if [ ! -d "$spec" ]; then
mkdir "$spec"
cp -pPR "$mountpoint"/. "$spec/"
fi
elif [ -f "$mountpoint" ]; then
if [ ! -f "$spec" ]; then
cp -pP "$mountpoint" "$spec"
fi
fi
mount -o "bind$options" "$spec" "$mountpoint"
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