From: Takaaki Tateishi <ttate@...>
Date: 2002-01-01T10:33:40+09:00
Subject: [ruby-talk:29923] Re: How to check free diskspace?

At Tue, 1 Jan 2002 06:23:23 +0900,
Le Wang <lewang@?.?.bigfoot.com (nospam)> wrote:
> I've checked "Programming Ruby", and searched the ML to no avail.  So
> how do you check free disk space, other than to parse 'df' output?

If we use quota file system, we can check current usage of
certain user using Ruby/Quota.
http://www.ruby-lang.org/en/raa-list.rhtml?name=Ruby%2FQuota

On windows, we can call GetDiskFreeSpaceA() using Win32API or
Ruby/DL module like this:

require 'dl'

module Kernel32
  Kernel32 = DL.dlopen("kernel32")
  SYM = {
    :getLogicalDrives => Kernel32['GetLogicalDrives','L'],
    :getDriveType     => Kernel32['GetDriveTypeA','IS'],
    :getDiskFreeSpace => Kernel32['GetDiskFreeSpaceA','LSllll'],
  }

  def getLogicalDrives()
    buff,_ = SYM[:getLogicalDrives][]
    return buff
  end

  def getDriveType(str)
    ty,_ = SYM[:getDriveType][str]
    return ty
  end

  def getDiskFreeSpace(str)
    err,args = SYM[:getDiskFreeSpace][str, 0, 0, 0, 0]
    str,sec_per_clus,byte_per_sec,free_clus,total_clus = *args
    return [sec_per_clus,byte_per_sec,free_clus,total_clus]
  end
end

include Kernel32

buff = getLogicalDrives()

i = 0
ds = []
while( i < 26 )
  mask = (1 << i)
  if( buff & mask > 0 )
    ds.push((65+i).chr)
  end
  i += 1
end

=begin
From the cygwin's /usr/include/w32api/winbase.h:
#define DRIVE_UNKNOWN 0
#define DRIVE_NO_ROOT_DIR 1
#define DRIVE_REMOVABLE 2
#define DRIVE_FIXED 3
#define DRIVE_REMOTE 4
#define DRIVE_CDROM 5
#define DRIVE_RAMDISK 6
=end

types = [
  "unknown",
  "no root dir",
  "Removable",
  "Fixed", 
  "Remote",
  "CDROM",
  "RAM",
]
ds.each{|d|
  t = getDriveType(d + ":\\")
  sec_per_clus,byte_per_sec,free_clus,total_clus = getDiskFreeSpace(d + ":\\")
  fbytes = sec_per_clus * byte_per_sec * free_clus
  tbytes = sec_per_clus * byte_per_sec * total_clus
  print("#{d} : #{types[t]} (#{fbytes}B/#{tbytes}B)\n")
}
--
Takaaki Tateishi <ttate@kt.jaist.ac.jp>