Re: [weewx-user] Re: Copy webcam image to /var/www/html/weewx/image.jpg

[Rich Strle]

Thanks very much Vince.

I appreciate your advice on the Linux Fundamentals course.

Rich Strle
309-824-9213

On Sun, Nov 22, 2020 at 12:34 PM vince <vinceska...@gmail.com> wrote:
>
> On Sunday, November 22, 2020 at 8:44:01 AM UTC-8 Rich Strle wrote:
>>
>> Looking at my passwrd file I see: 
>> www-data:x:33:33:www-data:/var/www:/usr/sbin/nologin
>> Would I remove the /nologin?
>>
>
> Please don't do that.
>
> www-data is the owner of the web 'data' and your webserver process likely 
> runs as that user.
> The nologin there ensures that if anybody/anything breaks security on your 
> webserver running process, then they still wouldn't be able to get a shell 
> and install/run malware etc.
>
> What you want to do is:
>
> put all your processing in a script
> run that script as the non-privileged user 'pi' and write to scratch 
> directories that pi can write to (/tmp or /var/tmp are likely places)
> in your script, do the 'privileged' copy of the output file to the 
> /var/www/html directory by prefacing your 'cp' command ala 'sudo cp'
> and you'll likely want to set the permissions on the file in /var/www/html 
> also with 'sudo chmod'
>
> (standard suggestion - if you're asking this you need to up your linux-fu a 
> little - I always suggest looking at the free edx.org Linux Fundamentals 
> course that literally a million folks have taken)
>
> A simple script that grabs Google's logo image as an example would look 
> something like:
>
>    #!/bin/bash
>    
> UPSTREAM_URL="https://www.google.com/images/branding/googlelogo/1x/googlelogo_color_272x92dp.png";
>    SCRATCH_FILE="/tmp/image.jpg"
>    FINAL_OUTPUT="/var/www/html/image.jpg"
>
>    # wget the file in quiet mode to a temporary location
>    wget -q "${URL}" "${SCRATCH_FILE}"
>
>    # copy it into place and fix up permissions via sudo
>    sudo cp "${SCRATCH_FILE}" "${FINAL_OUTPUT}"
>    sudo chown www-data "${FINAL_OUTPUT}"
>    sudo chmod 644      "${FINAL_OUTPUT}"
>
> This script did the right thing for me, FWIW.  You'll of course have to put 
> in the right wget switches to grab your image from the camera, as well as 
> doing any processing with ImageMagick etc. before you copy your image into 
> the web tree, but this should give you a skeleton to start with that does the 
> permission stuff...
>
>
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