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

[Greg Sinclair]

I do this by doing all the processing on the Pi capturing the image and 
then doing a sftp to place the image where weewx can find it.

Greg

On Sunday, November 22, 2020 at 1:47:33 PM UTC-6 Rich Strle wrote:

> Thanks very much Vince.
>
> I appreciate your advice on the Linux Fundamentals course.
>
> Rich Strle
> 309-824-9213 <(309)%20824-9213>
>
> On Sun, Nov 22, 2020 at 12:34 PM vince <vince...@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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