xdg-open silently fails

[lrkwz]

I'm using graphwiz though docker-compose-viz but when run to display on screen the command xdg-open silently fails.

Supposed you have a docker-compose.yml in the current dir the command line used is

docker pull pmsipilot/docker-compose-viz
docker run --rm \
    -it \
    -v $(pwd):/input/ \
    -u 0 \
    pmsipilot/docker-compose-viz \
    render --output-format display

My default image viewer is eog (gnome image viewer)

$ uname -a
Linux lrkwz-Precision-SSD-M4500 4.13.0-26-generic #29~16.04.2-Ubuntu SMP Tue Jan 9 22:00:44 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 16.04.3 LTS
Release:	16.04
Codename:	xenial
$ gnome-shell --version
GNOME Shell 3.18.5
$ xdg-open --version
xdg-open 1.1.0 rc3
$ eog --version
GNOME Image Viewer 3.18.2

See pmsipilot/docker-compose-viz#27

[clue]

Thank you for reporting!

Can you try running xdg-open image.svg manually and see if this reports any errors?

The current API used in this project is kind of awkward and will be reworked as per #14. Once this is in place, it should be far more reasonable to handle this situation and maybe throw an exception etc.

[lrkwz]

You are welcome:

$ xdg-open docker-compose.png
Gtk-Message: Failed to load module "unity-gtk-module"
Gtk-Message: Failed to load module "unity-gtk-module"

and the image shows up.

[clue]

I'm not sure I follow, your original report suggests that this library does not open an image and does not report an error, right? Here's a gist of what this library does:

$ php -r 'exec("xdg-open docker-compose.png >/dev/null 2>/dev/null");'

[lrkwz]

Right.
But your gist works without errors.
So it must be something related to the file being opened (permissions? dockerd runs under root permissions)

[clue]

Yeah, STDOUT/STDERR redirection isn't exactly helpful when debugging this issue :-) Can you try manually patching this line and see if this prints out any errors?

I'm not aware of any issues otherwise. I'm not familiar with your particular environment, but I suppose you're running this on your host and not within a Docker container?

[lrkwz]

We are catching it! Yes the command is run inside a docker container

docker run --rm \
    -it \
    -v $(pwd):/input/ \
    -u 0 \
    pmsipilot/docker-compose-viz \
    php -r 'exec("xdg-open docker-compose.png >/dev/null>/dev/null");'
sh: xdg-open: not found

@jubianchi can you fix the container?

[clue]

Happy to hear this helped pinpointing the issue!

For the reference: The upstream report mentions missing apk add xdg-utils

Despite this now being resolved, the error reporting will still eventually be improved via #14

[jubianchi]

thanks @clue and @lrkwz for finding what the real issue was.

I’m going to add the missing xdg-open inthe container.