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bindbins: just assume unionfs(1) exists and use it

--- a/bin/bindbins

+++ b/bin/bindbins

@@ -1,17 +1,7 @@

-#!/bin/rc

-if(test -d $home/p/rc)

-	bind -a $home/p/rc/bin /bin

-if(test -d $home/p/rc2)

-	bind -a $home/p/rc2/bin /bin

-if(test -d $home/p/pico)

-	touch $home/bin/rc/pico && bind $home/p/pico/pico $home/bin/rc/pico

-if(test -d $home/p/sm2/bin)

-	bind -a $home/p/sm2/bin /bin

-if(test -d $home/p/notes/bin)

-	bind -a $home/p/notes/bin /bin

-if(test -d /sys/lib/go/amd64-1.15.2/bin)

-	bind -a /sys/lib/go/amd64-1.15.2/bin /bin

+f=()

+for(i in $home/p/^(rc/bin rc2/bin pico sm2/bin notes/bin) $home/bin/^($objtype rc) /sys/lib/go/amd64-1.15.2/bin /usr/ocaml/bin)

+	if(test -e $i)

+		f=($f $i)

+unionfs -bm /bin $f /rc/bin /$objtype/bin

 if(test -f $home/p/rc/fn)

 	. $home/p/rc/fn

-if(test -d /usr/ocaml/bin)

-	bind -b /usr/ocaml/bin /bin