[fpc-pascal] Methods for autoupdating fpc programs?

waldo kitty wkitty42 at windstream.net
Sat Oct 3 21:04:31 CEST 2015

On 10/03/2015 02:30 PM, Bo Berglund wrote:
> The program will probably be started by cron every minute to check if
> it has anything to do and if so execute its data collection task and
> quit. Otherwise just quit, but here maybe also check for an update on
> the web?
> But how could one exchange a running program on the pi from within
> itself?

off the top of my head:

since you're running from cron and exiting, this could be pretty simple...

1. at start up, check if self is named known temp name. if yes, copy self to 
normal name, spawn normal name and die.
2. at start up pull md5 checksum file from server and compare with own md5 checksum.
3. if md5 sums are different, download new version to known temp name.
4. at end of execution, see if known temp name exists. if it does, spawn it and die.

maybe something like that... of course, somewhere in there you'll still do your 
required processing... the end of execution will wait for everything to be done 
before doing step 4...

one might also use a special command line parameter to tell the known temp name 
to copy itself over to the normal name in step 1.

  NOTE: No off-list assistance is given without prior approval.
        *Please keep mailing list traffic on the list* unless
        private contact is specifically requested and granted.

More information about the fpc-pascal mailing list