Ownership and rights of files on the Raspberry Pi

[DomoticaRob]

On my Raspberry PI with Domoticz the files have ‘pi’ as owner and ‘rwxrwxrwx’ as rights.

With a FTP program I can download these files to my local harddisk.

In a dzVents script I make output files. These files have ‘root’ as owner and ‘rw-r-----' as rights.

With a FTP program I CANNOT download these files to my local harddisk.

With the command: ‘sudo chown pi:pi filename’ I can change the owner and then I can download the file. I don’t want to do this every time.

In dzVents I use:

Code: Select all

local file = io.open(fileName, "w+")
io.output(file)
io.write("—Some strings— " .. item.name .. "\n")
io.write("—Some strings— " .. etcetera .. "\n")
io.close(file)

How can I make in dzVents output files with the proper ownership and rights?

[waaren]

Add this to your code

Code: Select all

 local fileName = "your file name"

        local function osExecute(cmd)
            local fileHandle     = assert(io.popen(cmd, 'r'))
            local commandOutput  = assert(fileHandle:read('*a'))
            local returnTable    = {fileHandle:close()}
            return commandOutput,returnTable[3]            -- rc[3] contains returnCode
        end

        
        local result, restultCode = osExecute("sudo chown pi:pi " .. "'" .. fileName .. "'" )
        result = osExecute("ls -l "   .. " '" .. fileName .. "'" )
        print (" rc: [" .. restultCode .."] " .. "result = " .. result  )

[DomoticaRob]

Super!

I don't understand the code, but is works!

Thank you very much.

I'm going to try to expand the code I use for the file output of the attributes of one device to do it for all the devices at ones. That will be a nice exercise.

Have a nice day.

[waaren]

I don't understand the code, but is works!

Please state the lines / statements that you don't understand and I will try to clarify. The whole idea of sharing these code snippets is to make forum member aware what is possible and without understanding, that purpose will not be achieved.

[DomoticaRob]

Hey Waaren,

You're right. Teaching and learning, that's whats it's all about.

For now I have a couple of very busy day's. Next week, I will look to the snippet, try to find out how and why and come back to you.