Debugging ModemManager from an IDE

[Garfield Watkins]

On 11/6/24 09:21, Garfield Watkins wrote:
>
> Hi
>
> I'm using vscode to develop a plugin for ModemManager but find that 
> debugging from the IDE is impossible. Can anyone share their setup for 
> debugging from an IDE without having to run anything under root ? e.g. 
> what is your d-bus policy config for ModemManager ? I'm also getting 
> ioctl permission errors. Im also launching a connection from Network 
> Manager and getting permission errors there too.
>
> Thanks
>
Ok. I'll answer my own question in case anyone else searches this 
mailing list looking  for a solution to this.

The idea is to only run gdb under sudo not the entire IDE, so to 
facilitate this:

 1. create a shell script wrapper around gdb e.g.
    ~/.local/bin/sudo_gdb.shThe contents being something like:
    #!/bin/bash
    sudo /usr/bin/gdb "$@"
 2. Make it executable
 3. Add /usr/bin/gdb to the /etc/sudoers file so that it can be run with
    sudo without asking for a password.
    yourusername ALL=(ALL) NOPASSWD: /usr/bin/gdb
 4. Modify your vscode debug launch configuration to use the script that
    wraps gdb as the debugger
    "version": "0.2.0",
    "configurations": [
    {
    "name": "(gdb) Launch",
    "type": "cppdbg",
    "request": "launch",
    "program": "${userHome}/.local/sbin/ModemManager",
    "args": ["--debug"],
    "stopAtEntry": false,
    "cwd": "${fileDirname}",
    "environment": [],
    "externalConsole": false,
    "MIMode": "gdb",
    "miDebuggerPath": "${userHome}/.local/bin/sudo_gdb.sh",
    "setupCommands": [
    {
    "description": "Enable pretty-printing for gdb",
    "text": "-enable-pretty-printing",
    "ignoreFailures": true
    },
    {
    "description": "Set Disassembly Flavor to Intel",
    "text": "-gdb-set disassembly-flavor intel",
    "ignoreFailures": true
    }
    ]
    }
    ]
    }
 5. You might find there are some library files that can't be found if
    you installed in a non default location. my install prefix was set
    to ${userHome}/.local/  and the /libmm-glib.so* could not be found
    so i just copied   .local/lib/aarch64-linux-gnu/libmm-glib.so*. to
    /usr/lib/aarch64-linux-gnu/