Re: [Discuss-gnuradio] GRC [Errno 13] Permission denied for No GUI graphs

[Jozef Lošonský]

OK, finaly I solved my issue, as I don't know the historical or political reasons in gnuradio here is my summary only, it can help to somebody with similar issue.

1) part of code in Generator.py requires xterm variable but it is not passing through on my system (xterm dependency should be installed manually on raspbian, but it doesn't matter, probably I'm missing something else)
...
        #when in no gui mode on linux, use an xterm (looks nice)
        if self._generate_options == 'no_gui' and 'linux' in sys.platform.lower():
            cmds = [XTERM_EXECUTABLE, '-e'] + cmds
...

   it is not working right, despite I'm exporting XTERM_EXECUTABLE manually in console...
2)

   I did simply comment out that line and replace it by (of course there are more elegant solutions, but...)

            cmds = cmds

3) hopefully Cinaed Simson is not interesting about my flowcharts/python codes anymore, because issue wasn't here :)

 

2017-07-07 6:51 GMT+02:00 Cinaed Simson <address@hidden>:

On 07/06/2017 04:54 PM, Jozef Lošonský wrote:
> OK, again, python script is successfully created/written, and it is
> runnable outside of GRC, the errno13 comes from execve call which is
> incomplete, can you see that, please?

Send the flowchart and the python code if you want help.

-- Cinaed

>
> On Jul 7, 2017 01:27, "Cinaed Simson" <address@hidden
> <mailto:address@hiddencom>> wrote:
>
>     On 07/06/2017 02:57 PM, Jozef Lošonský wrote:
>     > I'm not behind my pc, but I think that it is possible to understand my
>     > issue, that py file is generated from any flowgraph OK, but "play
>     > button" press fails with Errno13 when "No GUI" (of course I'm not
>     using
>     > any WX or QT block in such case).
>
>     Without at least an error message, e.g., Errno13, it's impossible to
>     figure out what the problem is since your explanations make no sense.
>
>     In fact, you've never indicated there was an error message.
>
>     Typically, an Errno13 is a write permission problem - it's not a
>     gnuradio or grc problem.
>
>     And the error should have included
>
>       Generate Error: [Errno 13] Permission denied:
>
>     and then it prints out the location of where you're writing to.
>
>     The obvious solution is to find another play to write the file.
>
>     -- Cinaed
>
>
>     >
>     > On Jul 6, 2017 11:48 PM, "Cinaed Simson" <address@hidden
>     <mailto:address@hiddencom>

>     > <mailto:address@hiddencom <mailto:address@hiddencom>>>
>     wrote:
>     >
>     >     On 07/06/2017 02:14 PM, Jozef Lošonský wrote:
>     >     > Hi, there are no GUI elements and graf generated py file works
>     >     fine from
>     >     > console, but GRC only is unable to execute that already
>     generated
>     >     file.
>     >
>     >     Then post the flowgraph and the python code - it's the only
>     way we can
>     >     help you.
>     >
>     >     -- Cinaed
>     >
>     >     >
>     >     > On Jul 6, 2017 11:08 PM, "Cinaed Simson"
>     <address@hidden <mailto:address@hiddencom>
>     >     <mailto:address@hiddencom <mailto:address@hiddencom>>
>     >     > <mailto:address@hiddencom
>     <mailto:address@hiddencom> <mailto:address@hiddencom
>     <mailto:address@hiddencom>>>>
>     >     wrote:
>     >     >
>     >     >     On 07/06/2017 12:10 AM, Jozef Lošonský wrote:
>     >     >     > Hello,
>     >     >     > my GRC is unable to execute graphs (no GUI elements)
>     when I
>     >     switch
>     >     >     > option to No GUI, everything else seems to be working.
>     >     >
>     >     >     The option "No GUI" means no GUI elements, i.e., no graphs.
>     >     >
>     >     >     If you had a graphical element in your flowgraph, GRC
>     should have
>     >     >     complained and printed an error message in the GRC console
>     >     when you
>     >     >     clicked on the button "Generate the flow graph".
>     >     >
>     >     >     In order to generate python code from GRC you have
>     disable the GUI
>     >     >     elements in the flowgraph in order to generate python code.
>     >     >
>     >     >     > In addition "No
>     >     >     > GUI" py script (generated by same GRC) is running fine in
>     >     console
>     >     >     of the
>     >     >     > same user which is running GRC what is interesting.
>     >     >
>     >     >     I didn't find other
>     >     >     > way how to try get more info about issue than run
>     whole GRC
>     >     under
>     >     >     strace
>     >     >     > -ffy and read the strace file.
>     >     >     > Comparing strace files with working GRC instance on
>     another PC
>     >     >    address@hidden
>     >     >     > did suggest that in execve python is missing.
>     >     >
>     >     >     And most likely the gnuradio software and the required
>     >     software packages
>     >     >     needed to run gnuradio on PC @jcorgan are probably
>     missing too.
>     >     >
>     >     >     A working installation of python is one of the
>     perquisite to run
>     >     >     gnuradio.
>     >     >
>     >     >     >
>     >     >     > Bad:
>     >     >     > [pid  2704] execve("/usr/local/bin/", ["", "-e",
>     >     "/usr/bin/python",
>     >     >     > "-u", "/home/pi/top_block.py"]...= -1 EACCES
>     (Permission denied)
>     >     >     > Good:
>     >     >     > [pid 12112] execve("/usr/bin/python",
>     ["/usr/bin/python", "-u",
>     >     >     > "/home/loso/top_block.py"], [/* 75 vars */]
>     <unfinished ...>
>     >     >     >
>     >     >     > I'm trying to find which env variable or what option am I
>     >     missing/have
>     >     >     > wrongly configured in GRC config or somewhere else.
>     >     >     Based on the content of this post, everything on your
>     machine
>     >     is working
>     >     >     correctly.
>     >     >
>     >     >     If you can actually generate an error message using
>     gnuradio -
>     >     other
>     >     >     then enclosed operator errors - post the error message, the
>     >     flowgraph
>     >     >     and the python code.
>     >     >
>     >     >     >
>     >     >     > Thank you.
>     >     >     > Jozef
>     >     >     >
>     >     >     >
>     >     >     >
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