root-tools/hidedir

   1 #!/bin/bash
   2
   3 declare -a dirs
   4 declare -A dirs_k=()
   5 declare -a types
   6 declare -A types_k
   7
   8 hidemount()
   9 {
  10         echo hide $1 >&2
  11         umount -i "$1"
  12         if [ $? != 0 -a -d "$1" ]
  13         then
  14                 local emptydir
  15                 if [ -d /var/run/empty ]
  16                 then
  17                         emptydir=/var/run/empty
  18                 elif [ -d /var/empty ]
  19                 then
  20                         emptydir=/var/empty
  21                 else
  22                         mkdir /var/run/empty
  23                         emptydir=/var/run/empty
  24                 fi
  25                 mount -o bind "$emptydir" "$1"
  26                 if [ $? != 0 ]
  27                 then
  28                         echo "Unable to hide \`$1'. Exiting." >&2
  29                         exit 2
  30                 fi
  31         fi
  32 }
  33
  34 getoptions()
  35 {
  36         netdev=0
  37         dirs=()
  38         types=()
  39         types_k=()
  40         inner=0
  41
  42         while [ -n "$1" ]
  43         do
  44                 case "$1" in
  45                 --help|-h|'')
  46                         echo "Usage: $0 [--netdev] [--dir DIR1:DIR2:...] [--fstype TYPE1,TYPE2,...] [cmd [args...]]" >&2
  47                         exit 1
  48                         ;;
  49                 --netdev)
  50                         netdev=1
  51                         ;;
  52                 --dir)
  53                         shift
  54                         dirs=(${1//:/ })
  55                         ;;
  56                 --fstype)
  57                         shift
  58                         types=(${1//,/ })
  59                         for t in "${types[@]}"
  60                         do
  61                                 types_k["$t"]=1
  62                         done
  63                         ;;
  64                 -u)
  65                         inner=1
  66                         ;;
  67                 --)
  68                         shift
  69                         break
  70                         ;;
  71                 -*)
  72                         echo "Unknown option: $1" >&2
  73                         exit 1
  74                         ;;
  75                 *)
  76                         break
  77                         ;;
  78                 esac
  79                 shift
  80         done
  81
  82         cmdargs=("$@")
  83 }
  84
  85
  86 myargs=("$@")
  87 getoptions "$@"
  88
  89
  90 if [ $inner = 0 ]
  91 then
  92         exec unshare -m -- $0 -u "${myargs[@]}"
  93         exit
  94 fi
  95
  96
  97 if [ ${#dirs[@]} = 0 -a ${#types[@]} = 0 ]
  98 then
  99         netdev=1
 100 fi
 101
 102 for d in "${dirs[@]}"
 103 do
 104         dirs_k["$d"]=1
 105 done
 106
 107 while read mntdev mntpnt mntype mntopt rest
 108 do
 109         if [ $netdev = 1 ]
 110         then
 111                 if [[ "$mntdev" =~ ^// ]] || [[ "$mntdev" =~ : ]]
 112                 then
 113                         dirs_k["$mntpnt"]=1
 114                 fi
 115         fi
 116         if [ -n "$mntype" ]
 117         then
 118                 if [ "${types_k[$mntype]}" = 1 ]
 119                 then
 120                         dirs_k["$mntpnt"]=1
 121                 else
 122                         for typepatt in "${types[@]}"
 123                         do
 124                                 typepatt=${typepatt//./\\.}
 125                                 typepatt=${typepatt//\*/.*}
 126                                 typepatt=${typepatt//\?/.}
 127                                 if [[ "$mntype" =~ ^$typepatt$ ]]
 128                                 then
 129                                         dirs_k["$mntpnt"]=1
 130                                 fi
 131                         done
 132                 fi
 133         fi
 134 done </proc/mounts
 135
 136 for d in "${!dirs_k[@]}"
 137 do
 138         hidemount "$d"
 139 done
 140
 141
 142 exec "${cmdargs[@]}"