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-rwxr-xr-xtests/functional/ca/build-with-garbage-path.sh21
1 files changed, 21 insertions, 0 deletions
diff --git a/tests/functional/ca/build-with-garbage-path.sh b/tests/functional/ca/build-with-garbage-path.sh
new file mode 100755
index 000000000..884cd2802
--- /dev/null
+++ b/tests/functional/ca/build-with-garbage-path.sh
@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+
+# Regression test for https://github.com/NixOS/nix/issues/4858
+
+source common.sh
+
+requireDaemonNewerThan "2.4pre20210621"
+
+# Get the output path of `rootCA`, and put some garbage instead
+outPath="$(nix-build ./content-addressed.nix -A rootCA --no-out-link)"
+nix-store --delete $(nix-store -q --referrers-closure "$outPath")
+touch "$outPath"
+
+# The build should correctly remove the garbage and put the expected path instead
+nix-build ./content-addressed.nix -A rootCA --no-out-link
+
+# Rebuild it. This shouldn’t overwrite the existing path
+oldInode=$(stat -c '%i' "$outPath")
+nix-build ./content-addressed.nix -A rootCA --no-out-link --arg seed 2
+newInode=$(stat -c '%i' "$outPath")
+[[ "$oldInode" == "$newInode" ]]