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source common.sh
# Instantiate.
drvPath=$($nixinstantiate substitutes2.nix)
echo "derivation is $drvPath"
# Find the output path.
outPath=$($nixstore -qvvvvv "$drvPath")
echo "output path is $outPath"
regSub() {
(echo $1 && echo "" && echo $2 && echo 3 && echo $outPath && echo Hallo && echo Wereld && echo 0) | $nixstore --register-substitutes
}
# Register a substitute for the output path.
regSub $outPath $(pwd)/substituter.sh
# Register another substitute for the output path. This one takes
# precedence over the previous one. It will fail.
regSub $outPath $(pwd)/substituter2.sh
$nixstore -rvv "$drvPath"
text=$(cat "$outPath"/hello)
if test "$text" != "Hallo Wereld"; then exit 1; fi
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