| #!/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" |