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86ada36e02
debsGrouped was a nested array, like `[ [ drv1 drv2 ] [ drv3 ] ... ]`.
that doesn't map to any bash item, so it would live only in the json attrs.
the `for component in "${debsGrouped[@]}"; ...` part of buildCommand
was thus referring to an unset variable... but the default bash behavior
is to treat that as an empty array even with `set -u` so the loop was
just doing nothing.
instead, flatten the array on the nix side. bash gets something like
`("drv1 drv2" "drv3" ...)` and the existing shell code destructures
that as expected.
verify by building a vm (e.g.
`tests.vmTools.buildPatchelfInDebian.diskImage`) and checking the
nix-log before and after for `INSTALLING COMPONENT` messages.
Co-Authored-By: Stefan Frijters <sfrijters@gmail.com>