Hey all,
I’m looking for a way to reliably list all drive letters or volume names
or mount points on a system.
Google has not helped me. Best I could find was
java.io.File.listRoots(), but on my Linux box it simply gives ‘/’ as the
sole root name, despite other devices being mounted.
Ultimately I want to check free disk space. The Apache project’s
org.apache.commons.io.FileSystemUtils has freeSpaceKb, but it needs to
be told the path to check.
Is there some Java/JRuby/Ruby way to do this across Win32, *nix, and
OSX? Pretty please? 
Worst case, I fall back to platform detection and some use of regexen
and shell commands. But I thought perhaps someone has blazed this path
already.
Thanks,
James
–
Neurogami - Smart application development
[email protected]
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James B. wrote:
org.apache.commons.io.FileSystemUtils has freeSpaceKb, but it needs to
be told the path to check.
Is there some Java/JRuby/Ruby way to do this across Win32, *nix, and
OSX? Pretty please? 
Worst case, I fall back to platform detection and some use of regexen
and shell commands. But I thought perhaps someone has blazed this path
already.
That’s the only thing that comes to mind…searching fstab or running
“mount” and so on. Maybe ask on ruby-talk and see if someone there has
an idea?
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Charles Oliver N. wrote:
James B. wrote:
Worst case, I fall back to platform detection and some use of regexen
and shell commands. But I thought perhaps someone has blazed this
path already.
That’s the only thing that comes to mind…searching fstab or running
“mount” and so on. Maybe ask on ruby-talk and see if someone there has
an idea?
I may do that. Best I saw was a sysutils gem, but it uses native code.
So far, I’ve written some methods that grab the results of df and grab
the names of things mounted off /dev/*
Seems OK, if you don’t stare directly at it.
James
–
Neurogami - Smart application development
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Trejkaz wrote:
I wonder if NIO2 is going to give us this API. It would be nice.
Probably a good chance. I wonder how much of it is in the dev builds of
Java 7?
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Charles Oliver N. wrote:
That doesn’t sound very cross-platform. What about our poor friends
saddled with that W-word OS?
I wonder if NIO2 is going to give us this API. It would be nice.
Probably a good chance. I wonder how much of it is in the dev builds of
Java 7?
Here’s what I ended up doing:
Check the CONFIG[‘target_os’]. If not mswin32, call df and parse the
text.
Else, call
java.io.File.list_roots.map{ |r| r.path }
I then used
org.apache.commons.io.FileSystemUtils.freeSpace path
to get the free space (which, as it seems, shells out to assorted
platform-specific commands, such as ‘df’. )
James
–
Neurogami - Smart application development
[email protected]
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Charles Oliver N. wrote:
Sounds like a good gem
What? really-hacky-free-space-0.0.1.gem?
It feels really fragile.
Maybe a gist would work better.
James
–
Neurogami - Smart application development
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On Tue, Jun 9, 2009 at 5:30 PM, James B.[email protected] wrote:
 org.apache.commons.io.FileSystemUtils.freeSpace path
to get the free space (which, as it seems, shells out to assorted
platform-specific commands, such as ‘df’. )
Sounds like a good gem
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