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Posted to dev@ant.apache.org by Robin Fernandes <re...@gmail.com> on 2011/01/23 14:02:23 UTC
Preserving file permissions in copy and zip tasks [patch]
Hi all,
A fairly common (and documented) gripe with filesystem tasks is that
they tend to ignore or lose Unix file permissions. I've had a look at
workarounds for this, and have found that the jna-posix library
(originally developed for JRuby) provides useful APIs for interacting
with file permissions as best as possible from current levels of Java.
The library attempts to invoke standard native functions over JNA if
possible, and falls back Java APIs (which can only approximate
permissions) if no suitable linkage is available.
Here's a patch which modifies the Copy and Zip tasks to preserve
permissions, using jna-posix : https://gist.github.com/792062.
Is this approach worth considering to make Ant's core tasks play
better with file permissions?
Cheers,
Robin
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Re: Preserving file permissions in copy and zip tasks [patch]
Posted by Jeffrey E Care <ca...@us.ibm.com>.
Haven't reviewed the code here but if it's not there already I would
suggest having some sort of abstraction layer for this function instead of
tying Ant directly to this jna-posix library. Last time I checked Java 7
is *supposed* to provide access to "bulk file attributes" (such as
permissions) under JSR 203; there may be other libraries that can
implement these functions too.
(http://openjdk.java.net/projects/nio/)
____________________________________________________________________________________________
Jeffrey E. (Jeff) Care
carej@us.ibm.com
IBM WebSphere Application Server
WAS Release Engineering
Robin Fernandes <re...@gmail.com> wrote on 01/23/2011 08:02:23 AM:
> [image removed]
>
> Preserving file permissions in copy and zip tasks [patch]
>
> Robin Fernandes
>
> to:
>
> dev
>
> 01/23/2011 08:11 AM
>
> Please respond to "Ant Developers List"
>
> Hi all,
>
> A fairly common (and documented) gripe with filesystem tasks is that
> they tend to ignore or lose Unix file permissions. I've had a look at
> workarounds for this, and have found that the jna-posix library
> (originally developed for JRuby) provides useful APIs for interacting
> with file permissions as best as possible from current levels of Java.
> The library attempts to invoke standard native functions over JNA if
> possible, and falls back Java APIs (which can only approximate
> permissions) if no suitable linkage is available.
>
> Here's a patch which modifies the Copy and Zip tasks to preserve
> permissions, using jna-posix : https://gist.github.com/792062.
> Is this approach worth considering to make Ant's core tasks play
> better with file permissions?
>
> Cheers,
> Robin
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: dev-unsubscribe@ant.apache.org
> For additional commands, e-mail: dev-help@ant.apache.org
>