tests/fetch-tests: avoid unnecessary copy-to-store #3315
Merged
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Previously path was concatenated using string interpolation. This commit switches from string interpolation to path interpolation.
The problem is nix will copy the "${directory}" to a new store object, meaning anything outside its root won't be available.
From the nix manual:
https://nix.dev/manual/nix/2.28/language/string-interpolation#interpolated-expression
This commit is cherry-picked from #3314, cc @stasjok
See prior discussion: #3314 (comment)