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

[Cinaed Simson]

On 07/09/2017 06:04 AM, Jozef Lošonský wrote:
> 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)

It is a result of operator error.

There should no reference to X11 anything anywhere in the python script
- X11 is the Linux GUI - "No GUI" means no X11 - no xterm.

If you want to eliminate the problem then you need to change the way
you're doing things.

-- Cinaed


> ...
>         #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
> <mailto: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@hidden>
>     > <mailto:address@hidden <mailto:address@hidden>>> 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@hidden>
>     >     <mailto:address@hidden <mailto:address@hidden>>
>     >     > <mailto:address@hidden
>     <mailto:address@hidden> <mailto:address@hidden
>     <mailto:address@hidden>>>>
>     >     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@hidden>
>     <mailto:address@hidden <mailto:address@hidden>>
>     >     >     <mailto:address@hidden
>     <mailto:address@hidden> <mailto:address@hidden
>     <mailto:address@hidden>>>
>     >     >     > <mailto:address@hidden
>     <mailto:address@hidden>
>     >     <mailto:address@hidden
>     <mailto:address@hidden>> <mailto:address@hidden
>     <mailto:address@hidden>
>     >     <mailto:address@hidden
>     <mailto:address@hidden>>>>>
>     >     >     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
>     >     >     >     @jcorgan
>     >     >     >     > 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
>     >     >     >     >
>     >     >     >     >
>     >     >     >     >
>     >     >     >     > _______________________________________________
>     >     >     >     > Discuss-gnuradio mailing list
>     >     >     >     > address@hidden
>     <mailto:address@hidden>
>     >     <mailto:address@hidden
>     <mailto:address@hidden>> <mailto:address@hidden
>     <mailto:address@hidden>
>     >     <mailto:address@hidden
>     <mailto:address@hidden>>>
>     >     >     <mailto:address@hidden
>     <mailto:address@hidden>
>     >     <mailto:address@hidden
>     <mailto:address@hidden>> <mailto:address@hidden
>     <mailto:address@hidden>
>     >     <mailto:address@hidden
>     <mailto:address@hidden>>>>
>     >     >     >     >
>     >     https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>     <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>
>     >     <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>     <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>>
>     >     >     <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>     <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>
>     >     <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>     <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>>>
>     >     >     >   
>      <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>     <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>
>     >     <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>     <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>>
>     >     >     <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>     <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>
>     >     <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>     <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>>>>
>     >     >     >     >
>     >     >     >
>     >     >     >
>     >     >     >     _______________________________________________
>     >     >     >     Discuss-gnuradio mailing list
>     >     >     >     address@hidden
>     <mailto:address@hidden>
>     >     <mailto:address@hidden
>     <mailto:address@hidden>> <mailto:address@hidden
>     <mailto:address@hidden>
>     >     <mailto:address@hidden
>     <mailto:address@hidden>>>
>     >     >     <mailto:address@hidden
>     <mailto:address@hidden>
>     >     <mailto:address@hidden
>     <mailto:address@hidden>> <mailto:address@hidden
>     <mailto:address@hidden>
>     >     <mailto:address@hidden
>     <mailto:address@hidden>>>>
>     >     >     >   
>      https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>     <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>
>     >     <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>     <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>>
>     >     >     <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>     <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>
>     >     <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>     <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>>>
>     >     >     >   
>      <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>     <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>
>     >     <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>     <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>>
>     >     >     <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>     <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>
>     >     <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>     <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>>>>
>     >     >     >
>     >     >
>     >
> 
>