Re: opening file for reading updates modification time!
Re: opening file for reading updates modification time!
- Subject: Re: opening file for reading updates modification time!
- From: Jim Luther <email@hidden>
- Date: Thu, 06 Feb 2014 10:11:04 -0800
The fs_usage command is handy for seeing what file system activity might be cause behaviors you see.
sudo fs_usage -w -f filesys
And then look for accesses to your file in the output. You can see all of the command's options with:
man 1 fs_usage
- Jim
On Feb 6, 2014, at 9:39 AM, Mark Day <email@hidden> wrote:
> I'll bet it's related to checksums. DMG files can have a checksum, used to detect whether the DMG contents were corrupted in transport. If I remember correctly, the Disk Images subsystem will verify the checksum the first time you use that image, and then mark it (with an extended attribute?) so that it won't have to verify the checksum again. I'll bet the modification is it marking the image as being known to match its checksum.
>
> -Mark
>
> On Feb 6, 2014, at 9:30 AM, Alan Snyder <email@hidden> wrote:
>
>> I’ve run into an odd situation involving specific files in two specific encrypted sparse disk images. I open two files for reading and then close them. The file that is closed first has its modification time updated as if it had been modified. The behavior is repeatable if I start with (a copy of) the same DMG files. However, the problem only occurs once in the mounted file system. I’m guessing there is some kind of corruption in the disk image files that is resolved when the files are closed.
>>
>> Please tell me this problem was discovered and fixed a while ago… :-)
>>
>>
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