update-kernel: Add undocumented '--reinstall' option

This will pass `--reinstall' to `apt-get install'.

Signed-off-by: Vitaly Chikunov <vt@altlinux.org>

update-kernel

@@ -89,7 +89,7 @@ ufver() {
 }
 
 #parse command line options
-TEMP=$(getopt -n "$PROG" -o a,i,l,f,y,t:,r:,v,n,h -l interactive,list,all,force,type:,release:,verbose,dry-run,help -- "$@") || show_help
+TEMP=$(getopt -n "$PROG" -o a,i,l,f,y,t:,r:,v,n,h -l interactive,list,all,force,type:,release:,verbose,reinstall,dry-run,help -- "$@") || show_help
 eval set -- "$TEMP"
 
 while :; do
@@ -110,6 +110,8 @@ while :; do
 			;;
 		-v|--verbose) verbose=1
 			;;
+		--reinstall) reinstall=$1
+			;;
 		-n|--dry-run) dryrun="--download-only"
 			;;
                 -h|--help) show_help
@@ -476,7 +478,7 @@ fi
 
 # now install everything at once
 # shellcheck disable=SC2086
-V apt-get install -o APT::Install::Virtual=true -y $dryrun "kernel-image-$kernel_flavour#$kmaxver" $modules_to_install \
+V apt-get install -o APT::Install::Virtual=true -y $reinstall $dryrun "kernel-image-$kernel_flavour#$kmaxver" $modules_to_install \
 	|| fatal "failed to install kernel-image-$kernel_flavour-$kmaxver with modules"
 
 # proper reboot will sync, but make sure it's synced in case user press reset button