How to find file on random partions then mount that partition

Question

Im trying to write a batch script that will find a specific file (EX .homemnt) on a random partion then mount that partition to what ever location I want (EX /home)..

Added notes: Will be used on multiple PCs with different device partitions location for specific folder (ex: /home)

Long story: Im working on a project that envolves LIVECD and I currently mount the home partition as writable but I have to manually find the device partition on each different computer. Im not trying to access other users files only boot to live cd mount home folder partition then log off/on and all the configs, data is there.. Currently it works great but I need a script that is "dummy" proof to allow others to boot to livecd and not have to Guess at partitions or devices.

Ive done scripts for awhile but nothing this advanced and I could use some help.

My Ideas but willing to consider anything at this point. Example script mounts 1 partions to /lookup search for file (.homemnt) then dismounts partition.. If it does not find file, moves on to next device/partition IF it find file then it save location as a variable,, UNMOUNTS partition

I then need to be able to take that variable to call it in a mount command. and mount partitsion as /home I dont need to mount specific users folder, just the whole partition to /home

im new to posting stuff and I hope that i did not overlook the answer somewhere else. Any help will be very much appriciated.

Answer 1

That should do it

#!/bin/bash

declare -a mounted
i=0
while read m
do
    mounted[$i]="$m"
    i=$((i+1))
done < <(mount|grep ^/dev|awk '{print $1}')

function ismounted {
    for i in ${mounted[*]}
    do
        if [ "$1" == "$i" ] ;then
            return 0
        fi
    done
    return 1
}

tmp=`mktemp -d /tmp/mount.XXXXXX`
found=""
while read m
do
    if ! ismounted $m; then
        mount $m $tmp 2>/dev/null
        r=$?
        if [ $r -eq 0 ] ;then
            if [ -f $tmp/.homemnt ] ;then
                found=$m
            fi
            umount $m
        fi
        if [ -n "$found" ]; then
            break
        fi
    fi
done < <(blkid -o device)
rmdir $tmp
if [ -n "$found" ] ;then
    mount $found /home
fi
echo $found