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michaelrsweet / hp-printer-app

Example printer application for HP PCL printers using PAPPL.
Apache License 2.0
35 stars 7 forks source link

hp-printer-app does not start at all, no error #6

Closed tillkamppeter closed 3 years ago

tillkamppeter commented 4 years ago

Describe the bug I have built the Snap of the current GIT snapshot of the hp-printer-app with

snapcraft clean
snapcraft snap

Then I have installed the Snap via

sudo snap install --dangerous hp-printer-app_1.0_amd64.snap

and started it with

hp-printer-app -o log-level=debug server

Instead of starting the server mode it immediately exited, without any error message or debug log message. Exit status is 1.

To Reproduce Do the commands mentioned above.

Expected behavior hp-printer-app running in server mode so that one can add printers and print.

System Information:

michaelrsweet commented 4 years ago

@tillkamppeter FWIW, the hp-printer-app snap is being built automatically: https://snapcraft.io/hp-printer-app/builds

Make sure you build against the latest PAPPL and hp-printer-app code - I had to push several fixes to get the snap building properly...

tillkamppeter commented 4 years ago

I have always built with the most recent code from GitHub. Now I have done a snapcraft clean and a snapcraft snap. Then I have started the application again, again with

hp-printer-app -o log-level=debug server

Now it does not immediately exit with code 1 and without error message, but, instead, it keeps running, but though I am running it in debug mode, it does not show any message, so seems to hang before setting up logging. It also does not start listening. I can neither access the web interface with a browser nor can does the system show as _ipps_system._tcp in avahi-discover or avahi-browse. If I run a non-server task, here

hp-printer-app -o log-level=debug drivers

I get only the message

hp-printer-app: No system callback specified.

I get absolutely the same results if I do not build by myself but, instead, download from the Snap Store:

sudo snap install --edge hp-printer-app

I have also tried to install my self-built Snap with

sudo snap install --devmode hp-printer-app_1.0_amd64.snap

and get the same results, so it seems that it is not a problem of confinement.

tillkamppeter commented 4 years ago

Concerning the output

hp-printer-app: No system callback specified.

when using the drivers sub-command, ps-printer-app has a system callback and lists the drivers. So something with your support for a PAPPL-built-in default system callback seems to be wrong.

tillkamppeter commented 4 years ago

I have found now where the log is hidden

/tmp/snap.hp-printer-app/tmp/pappl427934.log

It contains

I [2020-10-28T08:03:56.717Z] Starting log, system up 0 second(s), listening for connections on 'till-x1yoga.local:0'.
D [2020-10-28T08:03:56.717Z] Adding 'image/jpeg' to 'image/pwg-raster' filter.
D [2020-10-28T08:03:56.717Z] Adding 'image/png' to 'image/pwg-raster' filter.
I [2020-10-28T08:03:56.717Z] Listening for connections on '/tmp/hp-printer-app1000.sock'.
D [2020-10-28T08:03:56.717Z] Adding resource for '/favicon.png'.
D [2020-10-28T08:03:56.717Z] Adding resource for '/navicon.png'.
D [2020-10-28T08:03:56.717Z] Adding resource for '/style.css'.
D [2020-10-28T08:03:56.717Z] Adding resource for '/'.
D [2020-10-28T08:03:56.717Z] Adding resource for '/addprinter'.
D [2020-10-28T08:03:56.717Z] Adding resource for '/config'.
I [2020-10-28T08:03:56.717Z] Starting system.
I [2020-10-28T08:04:28.963Z] Shutting down system.

The last line was probably produced when I stopped the Printer Application with killall hp-printer-app.

tillkamppeter commented 3 years ago

I got it working now, see issue #7. So now it is actually running but not intuitive to run it correctly.