guix/tests/build-hook.sh

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export NIX_BUILD_HOOK="build-hook.hook.sh"
drvPath=$($TOP/src/nix-instantiate/nix-instantiate build-hook.nix)
echo "derivation is $drvPath"
outPath=$($TOP/src/nix-store/nix-store -quf "$drvPath")
echo "output path is $outPath"
text=$(cat "$outPath"/foobar)
if test "$text" != "BARBAR"; then exit 1; fi