sandbox.awk

#!/usr/bin/gawk -f
    function mount(MNT_PT,MNT_PATH){
      system("mkdir -p " MNT_PT)
      system("mount " MNT_PATH " " MNT_PT 2>/dev/null)
    }
    function mount_if_valid(MNT_PT,MNT_PATH,PROOT,PDRV                  ,F_MNT_PATH,D_MNT_PATH){
          if (system("[ -f " MNT_PATH " ] && exit 0 || exit 1") == 0){
            F_MNT_PATH=MNT_PATH
          } else if (system("[ -f " PROOT "/" MNT_PATH " ] && exit 0 || exit 1") == 0){
           F_MNT_PATH=PROOT "/" MNT_PATH
         } else if (system("[ -f " PDRV "/" PROOT "/" MNT_PATH " ]  && exit 0 || exit 1") == 0){
           F_MNT_PATH=PROOT "/" MNT_PATH
          } else if (system("[ -d " MNT_PATH " ] && exit 0 || exit 1") == 0){
            D_MNT_PATH=MNT_PATH
         } else if (system("[ -d " PROOT "/" MNT_PATH " ]  && exit 0 || exit 1") == 0){
           D_MNT_PATH=PROOT "/" MNT_PATH
         } else if (system("[ -d " PDRV "/" PROOT "/" MNT_PATH " ]  && exit 0 || exit 1") == 0 ){
           D_MNT_PATH=PROOT "/" MNT_PATH
         } else {
           F_MNT_PATH=""
           D_MNT_PATH=""
        }
        if (length(F_MNT_PATH)>0){
            mount(MNT_PT,F_MNT_PATH)
            if (system("cat /proc/mounts | grep -c -m1 " MNT_PT) > 0){
              result=sucess }
            else {
              result=fail }
        }
        else if (length(D_MNT_PATH)>0) {
           result=directory
        } else {
          result=fail
        }
        return result
    }
    BEGIN {OFS=" "}
    /^\s*$/ {next}
    /==mount==/ { mode=1 }
    /==losetup==/ { mode=2 }
    /==branches==/ { mode=3 }
    {
    if (mode == 1) {
      # get list of mount points, types, and devices - index is $3 (mount points)
      mountdev[$2]=$1
      mounttypes[$2]=$3

      field2[$2]=$3
    } else if (mode == 2) {
      # get list of loop devices and files - index is $1 (loop devs)
      sub(/:/,"",$1)
      sub(/.*[/]/,"",$3); sub(/)/,"",$3)
      loopdev[$1]=$3
    } else if (mode == 3) {
      # map mount types to loop files if mount devices is a loop
      for (m in mountdev) {
        if ( loopdev[mountdev[m]] != "" ){
             BNAME=loopdev[mountdev[m]]
             sub(/.*[/]/,"",BNAME)
             field2[m]=BNAME
             mountpath[m]=loopdev[mountdev[m]]
             system("echo 'BNAME=" BNAME " m=" m "' > /dev/stderr")
        }

      }
      # for (m in mountdev) print m " on " mountdev[m] " type " mounttypes[m]
      mode=4
    } else if (mode==4) {
      # print the branches and its mappings
      system( "echo 'AWK (mode==4):" $0 "' >/dev/stderr" )
      if ( !($1 in field2)){
        MNT_PT=$1
        MNT_PATH=$2
        if (length(MNT_PATH)==0){
          MNT_PATH=$1
        }
        mountpath[$1]=MNT_PATH

        if (length(MNT_PATH) ==0){
           next
        }
        mnt_status=mount_if_valid(MNT_PT,MNT_PATH,PDRV)
        if(mnt_status == "fail"){
            next
        }
        BNAME=MNT_PATH
        sub(/.*[/]/,"",BNAME)
         field2[MNT_PT]=BNAME
      }
       if (NF>2){
          STATE=$3
       } else {
            STATE="on"
       }
       if ("$STATE" !~ /(on|off)/){
           STATE="on"
       }
       start=length($1)-MAX_STR_LEN
       if (start<1) start=1
       #field1[$1]=substr($1,start)
       field1[$1]=$1
         #out1=field1[$1] " " field2[$1] " " STATE
         #out2=$1 " " mounttypes[$1] " " mountpath[$1]
         #print out1
         #print out2 > OUTFILE
       print field1[$1],field2[$1],STATE
       print field1[$1],field2[$1],STATE,$1,mounttypes[$1],mountpath[$1] > OUTFILE
    }
  }