DMG build reports "No space left on device"

when building on macOS, I am continually getting a “no space left” error during the build phase:

No space left on device: '/Applications' -> '/Volumes/napari 0.3.0/Applications'

I can fix it if I manually increase the “size” key in the dmg_settings variable here: https://github.com/beeware/briefcase/blob/ed4931d0a0f2daa0b6277c69d2d9d5bf8ebb9ae1/src/briefcase/platforms/macOS/dmg.py#L126-L130

but there doesn’t seem to be any way to do that without manually editing briefcase source… (and dmgbuild doesn’t take any environment variables overrides). Suggestions?

[tlambert03]

PR is merged so this should be fixed with the next release!

[tlambert03]

ok, found the issue: in this line of dmgbuild.core, when it converts total_size to a string version with the “K” suffix, it needs to divide by 1000 instead of 1024, this works:

total_size = str(max(total_size / 1000, 1000)) + 'K'

(otherwise the size is undercalculated by just a few megabytes in a 1.2GB image) will open an issue there.