Hello Markus,
This looks like RT ticket 101800.
https://rt.cpan.org/Public/Bug/Display.html?id=101800
I submitted a patch to implement the canary approach in that ticket, but
it has not yet had a response.
It could do with some review, so maybe try that patch with your system
and advise if it works or any modifications?
Regards,
Shawn.
On 13/05/2015 1:32, Markus Jansen wrote:
Hi,
on Linux, very often tmpwatch(8) is employed to clean /tmp and
/var/tmp periodically (on other systems, e.g. on Solaris 10,
this is not the default) via cron.daily. Whether atime, mtime, or
ctime, or a combination of these stamps are used, is a matter of the
local configuration.
Unfortunately, this results not in the removal of complete PAR
deployment trees in one of these directories, but to single files.
As PAR restitutes the correct mtime after unpacking for most files,
functionality may “slowly deteriorate”, worst case depending
on the mtime during packing the PAR executable.
While long-term servers could apply quite some countermeasures (such
as using a different location, or periodically “refreshing” their PAR
cache),
I fail to see an easy solution for “ordinary” client programs other
than setting PAR_CLEAN, thereby slowing startup down.
IMHO the cleanest solution would be to provide tmpwatch with a sort of
“wipe all or nothing of a tree” marks.
A possible PAR approach would be to unpack all files without setting
the mtime, except for a special “canary bird” file, which would be
artificially aged
by a little more than a day. Removing the “canary bird” would then
invalidate the cache.
Any opinions are highly appreciated.
Best regards,
Markus
Ericsson <http://www.ericsson.com/>
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