Execute disable bit on an mp3 player?

[Eric]

so, updates:

Bob/Chris: if the X bit isnt set on the .jar, Ubuntu just handles it
as an archive on doubleclick, and gives the 'execute bit disabled'
message if I right-click and "open with" java

Chris, additional:
i've run into that message(and the associated blurb on the website)
before - its why I knew to try it - just never had it not stick like
this.  Setting the bit does allow Ubuntu to handle this .jar as
intended (mp3 file-transfer to the player, as Sony did some weird
hashing somewhere instead of DRM), but only if it's on the hard drive

Trying to change the bit in the player's .jar doesn't even give me the
illusion of working; the check disappears immediately, although the
'most recent change' date does update

regarding CLI options:
adding a launcher with the command to launch the jar from player does
nothing(literally, no error, nothing)
from terminal, 'java -jar
/media/A091-E093/jsymphonic/JSymphonic_v0.3.0_Ode_To_Freedom/JSymphonic_v0.3.0_Ode_To_Freedom.jar'
 just returns "Unable to access jarfile" and the name of the .jar

Really starting to think Darcy was right all along(Sorry Darcy, just my nature)


On Mon, Feb 14, 2011 at 4:32 PM, Chris Irwin <chris at chrisirwin.ca> wrote:
> On Sat, Feb 12, 2011 at 11:47, Bob Jonkman <bjonkman at sobac.com> wrote:
>> Would the .jar files need to have the execute bit set?  I would think that
>> as far as the operating system is concerned, they're just data files for the
>> Java interpreter/compiler.  It's the Java executable program that needs the
>> X bit, and it is probably stored on your computer's drive, not the USB
>> drive.
>
> Jar files don't need the exec bit, except for when they do. You're
> executing `java`, not the .jar. If you're running it from the command
> line as `java -jar /my/file.jar`, you should be fine.
>
> However, Ubuntu has a wrapper called 'cautious-launcher' that is used
> to wrap around java and some other executables, and is used in
> .desktop files distributed by Ubuntu. The purpose of that script is to
> check if the input file (jar, .sh, whatever) actually has the exec bit
> set itself, then calls the required interpreter (java, bash,
> whatever). I believe cautious-launcher is also used when performing
> mime handling (double-clicking a jar file in nautilus, etc).
>
> https://wiki.ubuntu.com/SecurityTeam/Policies#Execute-Permission Bit Required
>
> The downside of this is that execute behaviour is different via GUI
> and CLI, since you probably won't be calling 'cautious-launcher'
> manually.
>
> --
> Chris Irwin
> <chris at chrisirwin.ca>
>
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