Show nicer error if cachedir can't be created #88
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If we cannot create the cache directory to install the elk.js dependencies, we used to crash with whatever error message the OS gave us. This can sometimes be misleading, e.g. when the message is talking about missing permissions, but in reality
$HOME
or$XDG_CACHE_HOME
is simply set to a broken value.This commit catches an OSError here and instead shows a nicer error message (and also much more concise stack trace) with a concrete hint towards
$HOME
.This is mostly relevant when running inside a container or as a system service, as it's much easier to accidentally miss some envvars there.