ns-mount - scripts - various script and utils
  HTML git clone git://z3bra.org/scripts
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       ---
       ns-mount (816B)
       ---
            1 #!/bin/sh
            2 
            3 ro=""
            4 rw=""
            5 
            6 usage() {
            7         echo "usage: $(basename $0) -n name [-rw dir] mountpoint" >&2
            8 }
            9 
           10 while getopts "hn:r:w:" OPT; do
           11         case $OPT in
           12         n) nsname="$OPTARG";;
           13         r) ro="$OPTARG";;
           14         w) rw="$OPTARG";;
           15         h) usage; exit 0;;
           16         *) usage; exit 1;;
           17         esac
           18 done
           19 shift $((OPTIND-1))
           20 
           21 if [ -z "$nsname" ] || [ $# -lt 1 ]; then
           22         usage
           23         exit 1
           24 fi
           25 
           26 mp="$1"
           27 ns=$(ns -i $nsname|awk '/root/{print $2}')
           28 pid=$(ns -i $nsname|awk '/init/{print $2}')
           29 
           30 opt="lowerdir=${ns}/${mp}"
           31 if [ -n "$ro" ]; then
           32         opt="${opt}:$(readlink -f $ro)"
           33 elif [ -n "$rw" ]; then
           34         wd="$HOME/.cache/overlayfs/work/$nsname"
           35         mkdir -p "$wd" "${ns}/${mp}"
           36         opt="${opt},workdir=$wd"
           37         opt="${opt},upperdir=$(readlink -f $rw)"
           38 fi
           39 
           40 mkdir -p "${ns}/${mp}"
           41 nsenter -t $pid -m -U --preserve-credentials -- \
           42         mount --onlyonce -t overlay overlay -o "$opt" "$ns/$mp"