🏠 Andrei's Blog

Expand the snapcraft.yml file and analyze extensions

snapcraft expand-extensions | yq '.apps[].plugs' | sort | uniq

Analyze the snap application log

sudo journalctl -e | grep DENIED | grep apparmor | grep <application-name>

Analyze the journalctl log

journalctl | grep snap

Clean, pack, remove and install snap

# clean
sudo snapcraft clean --verbosity debug && snapcraft pack --verbosity debug; sudo snap remove --purge fromgtog; sudo snap install fromgtog_*_amd64.snap --devmode && fromgtog

#super clean
sudo snapcraft clean --verbosity debug && snapcraft pack --verbosity debug; sudo snap remove --purge fromgtog; sudo snap install fromgtog_*_amd64.snap --devmode && fromgtog

# super super clean fromgtog 
sudo snapcraft clean --use-lxd --verbosity debug && snapcraft pack --verbosity debug;

sudo snap remove --purge fromgtog; rm -rf /snap/fromgtog; rm -rf ~/snap/fromgtog/common/.cache; sudo snap install fromgtog_*_amd64.snap --devmode && fromgtog

# super super clean fromgtog 
sudo snapcraft clean --use-lxd --verbosity debug && snapcraft pack --verbosity debug;

sudo snap remove --purge fromgtog; rm -rf /snap/fromgtog; rm -rf ~/snap/fromgtog; sudo snap install fromgtog_*_amd64.snap --devmode && fromgtog

# super super clean fromgtog + pack + remove + install + upload
sudo snapcraft clean --use-lxd --verbosity debug && snapcraft pack --verbosity debug && sudo snap remove --purge fromgtog && rm -rf /snap/fromgtog && rm -rf ~/snap/fromgtog && sudo snap install fromgtog_*_amd64.snap --devmode && gnome-terminal --working-directory=$(pwd) -- sh -c 'snapcraft upload --release=edge fromgtog_*_*.snap; sleep'; fromgtog

# super super clean noc-converter 

sudo snapcraft clean --use-lxd --verbosity debug && snapcraft pack --verbosity debug;

sudo snap remove --purge noc-convert; rm -rf /snap/noc-convert;  gnome-terminal --working-directory=$(pwd) -- sh -c 'snapcraft upload --release=edge noc-convert_*_*.snap; sleep'; rm -rf ~/snap/noc-convert/common/.cache; sudo snap install noc-convert_*_amd64.snap --devmode && noc-convert

# super super clean justfocus
sudo snapcraft clean --use-lxd --verbosity debug && snapcraft pack --verbosity debug;

sudo snap remove --purge justfocus; rm -rf /snap/justfocus; rm -rf ~/snap/justfocus/common/.cache; sudo snap install justfocus_*_amd64.snap --devmode && justfocus

# super super clean justfocus
sudo snapcraft clean --use-lxd --verbosity debug && snapcraft pack --verbosity debug && sudo snap remove --purge justfocus &&  rm -rf /snap/justfocus && rm -rf ~/snap/justfocus/common/.cache && sudo snap install justfocus_*_amd64.snap --devmode && justfocus

sudo snapcraft clean && snapcraft pack -f snapcraft-core20.yml && sudo snap remove fromgtog && sudo snap install fromgtog_9.0.7.1_amd64.snap --dangerous && fromgtog

sudo snapcraft clean && snapcraft pack --destructive-mode && sudo snap remove fromgtog && sudo snap install fromgtog_9.0.7_amd64.snap --dangerous && fromgtog

Upload

# upload fromgtog
snapcraft upload --release=edge fromgtog_*_*.snap

snapcraft upload --release=stable <my-snap>.snap

Snap Debugging

Open a shell

snap run --shell fromgtog
$SNAP/usr/lib/jvm/custom-jre/bin/java -Djava.awt.headless=false -classpath $SNAP/jar/fromgtog.jar com.andreidodu.fromgtog.Main

Snap connections

snap connections jmodules

Snappy debug

sudo snap install snappy-debug

sudo snappy-debug.security scanlog

Full clean

sudo snapcraft clean --use-lxd --verbosity debug

Pack your application

sudo snapcraft pack --verbosity debug;

Remove all from your old snap

sudo snap remove --purge YOU_SNAP_NAME;

Remove the remaining old stuff if exists

sudo rm -rf /snap/YOU_SNAP_NAME && rm -rf ~/snap/YOU_SNAP_NAME 

Install and execute the new snap

sudo snap install YOU_SNAP_NAME_*_*.snap --devmode && YOU_SNAP_NAME

• If you application writes and reads from tmp folder, clean the tmp folder otherwise it could happen that starting the application from your IDE works fine, because it writes and reads from /tmp, but if you run the snap you will not be able to write (just read), because from snap is not possible to access to the /tmp folder, so you could encounter unexpected behaviour.