Pathname.mountpoint?

bindmount されてる場合には使えないのね…

[root@foo work]# mkdir ./a ./b
[root@foo work]# mount --bind ./a ./b
[root@foo work]# mount
/dev/sda6 on /home type ext3 (rw)
/home/xcorp/work/a on /home/xcorp/work/b type none (rw,bind)

#!/usr/bin/ruby --

require 'pathname'

a = Pathname.new('/home/xcorp/work/a')
b = Pathname.new('/home/xcorp/work/b')

if a.mountpoint? then
  puts "/home/xcorp/work/a is mountpoint"
else
  puts "/home/xcorp/work/a is NOT mountpoint"
end

if b.mountpoint? then
  puts "/home/xcorp/work/b is mountpoint"
else
  puts "/home/xcorp/work/b is NOT mountpoint"
end

c = Pathname.new('/dev/sda6')
d = Pathname.new('/home')

if c.mountpoint? then
  puts "/dev/sda6 is mountpoint"
else
  puts "/dev/sda6 is NOT mountpoint"
end

if d.mountpoint? then
  puts "/home is mountpoint"
else
  puts "/home is NOT mountpoint"
end

[root@foo work]# ./test.rb
/home/xcorp/work/a is NOT mountpoint
/home/xcorp/work/b is NOT mountpoint
/dev/sda6 is NOT mountpoint
/home is mountpoint