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-   -   [M5+M6] [Announce] gpscon gps position cli shell console (https://talk.maemo.org/showthread.php?t=96176)

Halftux 2016-02-26 23:32
Re: [Announce] gpscon gps position cli shell console
 
Quote:
Originally Posted by pichlo (Post 1499905)
results in spawning a new instance every time my cron job kicks in and the previous instance never terminates if x is any value other than 1. That means that after 30 minutes I have 10 instances of gpscon running and no data uploaded because my script never passed that line. If I use x=1, the script runs normally but the value is never updated.

What am I doing wrong?
It could be your script or the argument parser of gpscon which causes the weird behavior when used with script/cron.

I think some how the default variable value will be used and this means last known value and endless loop.

If it is not your script (I still need to try) I could change the default values (options and variable) for gpscon or better writing a own argument parser which will work with this situation.

Never tried cron-scripts with gpscon now it is time to do so.:)

Quote:
Originally Posted by pichlo (Post 1499905)
That makes sense. But it turns upside down my understanding of how the positioning in Sailfish works. I never turn it off and I was assuming that it would stay locked. Apparently not.
I think turning on means it could be used. Only when someone makes a request about your position it will get locked and this will be fast when you have all near satellite positions. It could be if the gps uses 3-4 satellites the signal is locked already.
To safe power is priority number one.

Halftux 2016-02-27 14:14
Re: [Announce] gpscon gps position cli shell console
 
@pichlo Thank you very much for reporting this issue.
I found the bug, it is the console reader in gpscon which was causing the cron problem.

You can stick to the gpscon-0.0.4-1.armv7hl.rpm version to solve the problem or wait for a new version.

The latest version on openrepos gpscon-0.0.8-1.armv7hl.rpm will not fix the problem it was a test version about the argument parser, but the next version will correct the console reader for sure.

Halftux 2016-02-27 21:50
Re: [Announce] gpscon gps position cli shell console
 
Important update to gpscon!

For using gpscon in cron, python or any script it is recommended to use the additional otpion "--script" otherwise it could hang.
This feature is there since version 0.0.8. Type gpscon --help to check version.

All other version between 0.0.4 and 0.0.8 have a bug which cause the application hang when used with scripts and if there is no stdin.

For now this is the easiest and safest solution. I will see if it could be detected and automatically switched.

pichlo 2016-02-28 19:46
Re: [Announce] gpscon gps position cli shell console
 
Hey Halftux, thanks a million for looking into this and sorry for the late feedback. Weekends are the busiest time. During the week I can (sometimes) steal some time from my employer but stealing it from the family is a bit more difficult ;)

Unfortunately, neither a downgrade to 0.0.4 nor an upgrade to 0.0.8 and adding the --script option has made any difference. The script still freezes when launched from cron. After a while, ps shows a number of instances of my script and gpscon runs=3 running. Killing them all makes the stuck scripts move forward all at once. Having read the above post about no stdin, I also tried adding a redirection from a file (gpscon runs=3 < somefile, with or without --script) but that has not made any difference either. The only thing that does not freeze is runs=1, but that produces wrong coordinates as described earlier.

So I am thinking about changing the paradigm completely and repeating my question from a few posts back. @juiceme, how did you do it?

Halftux 2016-02-29 11:53
Re: [Announce] gpscon gps position cli shell console
 
Quote:
Originally Posted by pichlo (Post 1500090)
Hey Halftux, thanks a million for looking into this and sorry for the late feedback. Weekends are the busiest time. During the week I can (sometimes) steal some time from my employer but stealing it from the family is a bit more difficult ;)
No problem I can understand.

Quote:
Originally Posted by pichlo (Post 1500090)
Unfortunately, neither a downgrade to 0.0.4 nor an upgrade to 0.0.8 and adding the --script option has made any difference. The script still freezes when launched from cron.
Please start your script in cron like this: "sh gps.sh".
This could solve your issue.

Halftux 2016-02-29 15:10
Re: [Announce] gpscon gps position cli shell console
 
I have recognized when using gpscon run=1 posm=onlysat --script
will run for ever until satellites are in view. I will add in the future a timeout for this case (run=1 posm=onlysat).
When the timeout is reached it closes the app or will fall back to an other positioning method which is not so exact. I will see.

pichlo 2016-02-29 15:29
Re: [Announce] gpscon gps position cli shell console
 
Quote:
Originally Posted by Halftux (Post 1500136)
Please start your script in cron like this: "sh gps.sh".
This could solve your issue.
Why did I not think of that myself? :o:o

Sadly, no :(
Code:
[nemo@Dinghy ~]$ ps ax | grep gps
  457 ?        Ss    0:00 /bin/sh ./gpsconupload
  458 ?        S      0:00 /bin/sh ./gpsconupload
  459 ?        S      0:00 gpscon --script runs=3
 1221 ?        Ss    0:00 /bin/sh ./gpsconupload
 1222 ?        S      0:00 /bin/sh ./gpsconupload
 1224 ?        S      0:00 gpscon --script runs=3
 1306 pts/0    S+    0:00 grep gps
[nemo@Dinghy ~]$
I have no idea where the double entries (pid 457/458 and 1221/1222) come from.

For a reference, I have made only a minimal change to the script.
Adding --script and replacing curl with echo:
Code:
#!/bin/sh

STR=`gpscon --script runs=3 | tail -n 1`

LAT=`echo $STR | cut -d " " -f 2 | cut -d ";" -f 1`
LON=`echo $STR | cut -d " " -f 4 | cut -d ";" -f 1`
ALT=`echo $STR | cut -d " " -f 6`

STR={\"gid\":\"`hostname`\",\"time\":`date +%s`,\"lon\":$LON,\"lat\":$LAT
if [ $ALT != "nan" ]; then
  STR=$STR,\"alt\":$ALT
fi
STR=$STR}

echo $STR >> ~/gpsconlog.txt
I have also tried splitting it in two files. The file evoked by cron has only the following:
Code:
#!/bin/sh

sh ./gpsconupload.do
That did not help either:
Code:
[nemo@Dinghy ~]$ ps ax | grep gps
 3871 ?        Ss    0:00 sh ./gpsconupload
 3872 ?        S      0:00 sh ./gpsconupload.do
 3873 ?        S      0:00 sh ./gpsconupload.do
 3874 ?        S      0:00 gpscon --script runs=3
 4076 ?        Ss    0:00 sh ./gpsconupload
 4077 ?        S      0:00 sh ./gpsconupload.do
 4078 ?        S      0:00 sh ./gpsconupload.do
 4079 ?        S      0:00 gpscon --script runs=3
 4088 pts/0    S+    0:00 grep gps
[nemo@Dinghy ~]$
Note again the double entries. They cannot be explained by a bug in or a misconfiguration of cron since cron launches only sh ./gpsconupload, which in turn runs the .do file. Any idea what's going on here?

Halftux 2016-02-29 18:46
Re: [Announce] gpscon gps position cli shell console
 
Quote:
Originally Posted by pichlo (Post 1500161)

I have no idea where the double entries (pid 457/458 and 1221/1222) come from.

Any idea what's going on here?
No sorry I don't know:( Could be the shell from cron:confused:
Here a link to start with another shell. What shell does sailfish use?

Quote:
Cron has several enviromental variables configured in /etc/crontab, specifically SHELL and PATH. The default value for SHELL is /bin/sh. So unless this is changed or otherwise specified in a script, cron will execute commands using sh.

Here is my scenario with N900.

In alarmed I write as command:
Code:
sh /opt/gps.sh
gps.sh
Code:
#!/bin/sh

gpscon runs=3 --script > /home/user/MyDocs/gps2.txt
or
Code:
#!/bin/sh

STR=`gpscon runs=3 --script`

LAT=`echo $STR | cut -d " " -f 2 | cut -d ";" -f 1`
LON=`echo $STR | cut -d " " -f 4 | cut -d ";" -f 1`
ALT=`echo $STR | cut -d " " -f 6`

STR={\"name\":\"`hostname`\",\"time\":`date +%s`,\"lon\":$LON,\"lat\":$LAT
echo $STR > /home/user/MyDocs/gps2.log
running without a problem with alarmed. If you not put sh infront it will not work.

Code:
14554 user      2084 S    /bin/ash -c sh /opt/gps.sh
14555 user      2084 S    sh /opt/gps.sh
14556 user    27632 S    gpscon runs=3 --script
14560 user      2088 S    grep gps
Now comes the funny thing doesn't matter with or without cron.
When in the location settings the location supl. server is deactivated or when using posm=onlysat is set, there will be no output unless you have enough satellites in view.

Halftux 2016-03-02 10:22
Re: [Announce] gpscon gps position cli shell console
 
Maybe it has nothing to do with cron. I am working now on a debug version and try to avoid a qt event loop. It could be that there is spawning another instance?
I had with another application going from qt4 to qt5 problems with event loops. Stay tuned.

pichlo 2016-03-02 10:28
Re: [Announce] gpscon gps position cli shell console
 
Good point, I will try launching another Qt app from cron and see what happens.

The curious bit is that it runs normally with runs=1, only gives incorrect results.
What is the difference between runs=1 and runs=3 that may cause the hang?


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