[fpc-pascal] Methods for autoupdating fpc programs?
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
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.
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