# arg 1:  the new package version
 post_install() {
   depmod -a
 }
  
 # arg 1:  the new package version
 # arg 2:  the old package version
 post_upgrade() {
   post_install $1
 }
    
 # arg 1:  the old package version
 post_remove() {
   depmod -a
 }
      
 op=$1
 shift
 $op $*