#!/bin/sh    
 
s1="hostname:/path/to/repo"
s2="/path/to/repo/foo/bar"
 
r1=`echo $s1 | sed 's/hostname:\(.*\)$/\1/'`
echo r1: $r1
r2=`echo $r1 | sed 's,/,\\\/,g'`
echo r2: $r2
echo $s2 | sed "s/$r2//"