[Nut-upsuser] Help with CGI upsstats.cgi giving "file not found"

[Tim Reimers KA4LFP]

Hi everyone --

I'm having a problem with the CGI scripts for NUT.

First, a summary:
- I have a RasPI  (hereafter referred to as Pi1)  running Bullseye in which
this all WORKS FINE -- the upsd/upsc/ monitor services, etc
- I have a SECOND RasPI (hereafter referred to as Pi2) running Bullseye in
which ONLY the CGI scripts do not work.
All other (upsc/upsd/systemctl) show normal status and work to retrieve
data from the single UPS attached to each Pi.

Discussion below is in regard to "PI2", in which CGI scripts don't work.
On "Pi1" everything works fine.

I have compared many files/permissions/config files, and cannot find a
difference between the two Pi.

On both of them, running "upsc <ups>@localhost" works fine, and produces
output from the UPS.
So at a basic level, the UPS is connected to the USB port, the driver is
working, and the upsd monitoring service is OK.


The essential problem
The CGI script returns "file not found"
If I execute it from a browser via Apache,
I simply get a 500 Internal Server Error.

On another site, I discovered that it's possible to simply execute a CGI
script directly, if it's a compiled executable.

Here's what happens at the CLI by executing the file.
root at Pi2 :~# /var/www/cgi-bin/nut/upsstats.cgi
-bash: /var/www/cgi-bin/nut/upsstats.cgi: No such file or directory

That's different from the suggested scenarios for running upsstats.cgi from
the CLI, which were issues
with host authentication or "spits a bunch of HTML at you", which would be
fine.

On "Pi1", the fully working one - that's exactly what happens  - calling
"upsstats.cgi" from the CLI
results in it simply spitting out HTML with the configured UPS detailed out.
Running the CGI from a browser > Apache2 on the Pi works exactly as
expected

What I lack an understanding of is which files in /etc/nut
these CGI scripts access, and what permissions are needed.
Or if there are other files in other directories that the CGI scripts need.
That error, cryptically gives me the impression that the CGI script cannot
access some file it needs
I've looked at
/etc/nut/hosts.conf
/etc/nut/upsstats.html
/etc/nut/upssstats-single.html
/etc/nut/upsset.conf

All those files -- which I believe to be the required ones for CGI, appear
to be identical on Pi2 as compared to Pi1

Does anyone have any idea which files/permissions that the CGI may require
other than the above?
I'm not sure if something in /usr/lib /var/wherever, etc are also required?

Thanks Tim

Some details for those who will want to compare versions, etc.

The apache logfile
[Tue Dec 19 15:20:42.088991 2023] [cgi:error] [pid 3293] [client
72.250.240.54:31043] AH01215: (2)No such file or directory: exec of
'/var/www/cgi-bin/nut/upsstats.cgi' failed:
/var/www/cgi-bin/nut/upsstats.cgi
[Tue Dec 19 15:20:42.092452 2023] [cgi:error] [pid 3293] [client
72.250.240.54:31043] End of script output before headers: upsstats.cgi
[Tue Dec 19 15:20:42.498512 2023] [cgi:error] [pid 3294] [client
72.250.240.54:40731] AH01215: (2)No such file or directory: exec of
'/var/www/cgi-bin/nut/upsstats.cgi' failed:
/var/www/cgi-bin/nut/upsstats.cgi
[Tue Dec 19 15:20:42.502123 2023] [cgi:error] [pid 3294] [client
72.250.240.54:40731] End of script output before headers: upsstats.cgi

Permissions on /etc/nut
root at spivey:~#  ls -la /etc/nut
total 64
drwxr-xr-x 1 root nut   292 Dec 18 20:02 .
drwxr-xr-x 1 root root 3882 Dec 19 06:14 ..
-rwxr-x--- 1 nut  nut   675 Dec  6 20:40 etcnutfileperms.txt
-rwxr-x--- 1 root root 1148 Dec 18 20:02 hosts.conf
-rwxr-x--- 1 nut  nut  1543 Dec  6 20:40 nut.conf
-rwxr-x--- 1 nut  root 1137 Dec 15 21:12 old-hosts.conf
-rwxr-x--- 1 nut  nut  6170 Dec 18 20:01 ups.conf
-rwxr-x--- 1 nut  nut  4631 Dec  6 20:40 upsd.conf
-rwxr-x--- 1 nut  nut  2185 Dec 18 19:54 upsd.users
-rwxr-x--- 1 root root 1263 Dec 18 20:01 upsmon.conf
-rwxr-x--- 1 nut  nut  5634 Dec  6 20:40 upssched.conf
-rwxr-x--- 1 nut  nut  1415 Dec 15 21:36 upsset.conf
-rwxr-x--- 1 nut  root 3603 Dec  6 20:40 upsstats.html
-rwxr-x--- 1 nut  root 6446 Dec  6 20:40 upsstats-single.html
root at spivey:~#  ls -la /etc/ | grep nut
drwxr-xr-x 1 root nut      292 Dec 18 20:02 nut


root at Pi2:~# upsc tripplite at localhost
Init SSL without certificate database
battery.charge: 100
.
.


root at Pi2:~# /usr/sbin/upsd -DD -a tripplite at localhost
Network UPS Tools upsd 2.7.4


root at Pi2:~#
root at spivey:~# file /var/www/cgi-bin/nut/upsstats.cgi
/var/www/cgi-bin/nut/upsstats.cgi: ELF 32-bit LSB executable, ARM, EABI5
version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux-armhf.so.3,
BuildID[sha1]=52f4d9e65d096388e4b3cb3df2673bf59bbdfa70, for GNU/Linux
3.2.0, stripped
root at Pi2:~#
root at Pi1:~#





####
Tim, KA4LFP####

####
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Real radios glow in the dark.
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