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-rw-r--r--tests/fallback.sh13
1 files changed, 6 insertions, 7 deletions
diff --git a/tests/fallback.sh b/tests/fallback.sh
index b859d74ee707..081e5695f400 100644
--- a/tests/fallback.sh
+++ b/tests/fallback.sh
@@ -1,15 +1,14 @@
 storeExpr=$($TOP/src/nix-instantiate/nix-instantiate fallback.nix)
-
 echo "store expr is $storeExpr"
 
-# Register a non-existant successor (and a nox-existant substitute).
-suc=$NIX_STORE_DIR/deadbeafdeadbeafdeadbeafdeadbeaf-s.store
-(echo $suc && echo $TOP/no-such-program && echo 0) | $TOP/src/nix-store/nix-store --substitute
-$TOP/src/nix-store/nix-store --successor $storeExpr $suc
+outPath=$($TOP/src/nix-store/nix-store -q --fallback "$storeExpr")
+echo "output path is $outPath"
 
-outPath=$($TOP/src/nix-store/nix-store -qnf --fallback "$storeExpr")
+# Register a non-existant substitute
+(echo $outPath && echo $TOP/no-such-program && echo 0) | $TOP/src/nix-store/nix-store --substitute
 
-echo "output path is $outPath"
+# Build the derivation
+$TOP/src/nix-store/nix-store -r --fallback "$storeExpr"
 
 text=$(cat "$outPath"/hello)
 if test "$text" != "Hello World!"; then exit 1; fi