On 02/19/2014 08:42 AM, brian wrote:
On 02/19/2014 04:07 AM, Mattias Gaertner wrote:
On Wed, 19 Feb 2014 03:46:51 -0500
brian <[email protected]> wrote:
[...]
on a network drive. This is using Debian 7.2, and a recent svn version
of Lazarus (I actually use fpcup to do the downloads and builds). The
information on the 'About' page is version 1.3, date 2014-02-12, fpc
version 2.6.3, svn revision 44027, x86_64-linux-gtk 2
[...]
chmods and/or deletes on the files on the network drive.
Stepping through with the debugger, some, but not all, of the
attempted chmods return a status of -1. Some, but not all, of the
calls to sysutils.deletefile return false. What is puzzling me is that
if, instead of calling fpchmod and sysutils.deletefile I instead call
fpsystem and do the operations that way, it works. I can also run up a
command prompt and do the failed operations that way with no problem.
[...]
Is it reproducable on the same file?
On the basis of two examples of each, yes.
Can you give an example file name?
Two of the files which failed to delete are unknown.mp4 and video_ts.vob.
Two files where the attempt to chmod them failed are
The_Buddhas_Instruction_to_his_son.mp4 and
Yogis_Of_Tibet_Rare_Documentary.mp4
In all cases, the full paths are made up of
['A'..'Z','a'..'z','0'..'9','_'] only
(well, also '/' and '.', obviously!)
What kind of network share?
It's a Western Digital 4TB "My Cloud" drive, with the shared /nfs
directory on the drive mounted to a root-level directory on my PC.
Nobody else is using the drive - I've only two PCs on the LAN, and my
wife's machine was switched off. The drive is hanging off one of the
ports of my four-port Linksys router.
Special characters, wrong encoding, server lock, faulty network.
Definitely not the first. I've written out the full paths to a log
file, and they are correct - editing the logs and putting an 'ls ' in
front of the file names provides the expected results. The drive is
powered down overnight, and I'm the only user, so I can't see how
there could be a server lock unless there's something wrong with the
drive. I've seen nothing else to indicate a faulty router.
I know this all sounds crazy. I wouldn't have believed it had I not
been seeing it for myself. The only thing I could come up with (and
the reason for my post here) was that single-stepping under the
debugger somehow caused the problem.
I'm not asking anybody to do any amount of research on this - it's
trivial for me to tweak the program so that it writes commands to a
file rather than tries to run the chmods and deletes, and I can just
run the resulting file from the CLI.
I'm sorry for the delay in replying, folks. Programming is now just a
hobby for me, and other things got in the way.
Mattias:
I was single stepping in the debugger just to check I'd not made any
mistakes in the code - I didn't have the nerve to run the program in
its entirety yet, it would be a lot of work if I'd made a mistake
somewhere and had to rebuild all the network drive stuff.
What I did was to write a small test application, all it is is a
button on a form (I wanted to stick with the GUI, as that's what the
real program is) and the OnClick tries to chmod and delete those two
pairs of files which I mentioned above. I compiled this and then ran
it outside of the IDE (I can send you the project if you wish, but it
really is that simple). The program worked just fine.
Mark:
The directory and file ownerships, permissions etc was the first thing
I checked, they're not symlinks, and no, nothing else had them open.
Bart and Reinier:
It's an NFS share, no Samba involved.
Waldo:
I think you've got the answer. I added the suggested delay (0.25
second) before each of the chmod and delete operations, and while the
deletions are done, I let the chmods all run again, and got no errors
whatsoever. It does begin to look like the drive couldn't keep pace
with it all. I don't have enough experience with this sort of
configuration to know whether that's something to expect or whether
it's a problem with my particular setup, but since I now have three
workrounds that work (add a delay, use an fpSystem call instead or
write a script) then that's fine by me.
Thanks for the suggestions, all.
Brian.
Thanks for the assistance, folks.
--
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