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authorProfpatsch <mail@profpatsch.de>2021-01-30T08·25+0100
committerProfpatsch <mail@profpatsch.de>2021-02-19T23·04+0000
commit83e81def2316de2800d3a78b8294835a5319c191 (patch)
tree62c4c45c8c368884fc58ca7809f0863d2455148a /nix/buildLisp/README.md
parent0f1a497361893e5324e61812a8db6ca77369789f (diff)
feat(nix/readTree): give better error message when not a function r/2224
When a file is added to the depot tree that is picked up by read-tree,
but it’s not a function like ({...}: {}), `readTree` will fail on the
function application, leading to a bad error message.

We can do slightly better, by checking the type and throwing a nicer
trace message.

`assertMsg` is copied from `nixpkgs/lib/assert.nix`, since at this
point we don’t have a reference to the lib.

There is another evaluation failure that can happen, which is when the
function we try to call does not have dots; however, nix does not
provide any inflection capabilies for checking whether a function
attrset is open (`builtins.functionArgs` only tells us the attrs it
mentions explicitly). Maybe the locality of the error could be
improved somehow.

Change-Id: Ibe38ce78bb56902075f7c31f2eeeb93485b34be3
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2469
Tested-by: BuildkiteCI
Reviewed-by: tazjin <mail@tazj.in>
Diffstat (limited to 'nix/buildLisp/README.md')
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