Every now and again I make firmware that is too big

Error: Firmware is too big to fit in designated partition (1844624 > 1835008)

for example Is there a command line tool / way that I can get the size of an envelope file? without having to try and flash it? I thought perhaps

jag toit tool firmware -e apps.envelope show | yq '.Containers | .[] as $item ireduce (0; . + $item.Size)'

, but that returns only

396868

(far below the limit)?

I think

toit tool firmware extract --image ...

should give you a file with the correct size.

that looks correct

jag toit tool firmware -e apps.envelope extract -o /tmp/foo
ls -la /tmp | grep foo
-rw-r--r--  1 adam adam 1844624 Sep 26 10:07 foo