Add test case for NARs with duplicate directory entries

This test was made by @puckipedia.

(cherry picked from commit 83d5b32803)

tests/functional/case-hack.sh

@@ -1,21 +0,0 @@
-#!/usr/bin/env bash
-
-source common.sh
-
-clearStore
-
-rm -rf $TEST_ROOT/case
-
-opts="--option use-case-hack true"
-
-# Check whether restoring and dumping a NAR that contains case
-# collisions is round-tripping, even on a case-insensitive system.
-nix-store $opts  --restore $TEST_ROOT/case < case.nar
-nix-store $opts --dump $TEST_ROOT/case > $TEST_ROOT/case.nar
-cmp case.nar $TEST_ROOT/case.nar
-[ "$(nix-hash $opts --type sha256 $TEST_ROOT/case)" = "$(nix-hash --flat --type sha256 case.nar)" ]
-
-# Check whether we detect true collisions (e.g. those remaining after
-# removal of the suffix).
-touch "$TEST_ROOT/case/xt_CONNMARK.h~nix~case~hack~3"
-(! nix-store $opts --dump $TEST_ROOT/case > /dev/null)

tests/functional/local.mk

@@ -108,7 +108,7 @@ nix_tests = \
   derivation-json.sh \
   import-derivation.sh \
   nix_path.sh \
-  case-hack.sh \
+  nars.sh \
   placeholders.sh \
   ssh-relay.sh \
   build.sh \

tests/functional/nars.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+
+source common.sh
+
+clearStore
+
+# Check that NARs with duplicate directory entries are rejected.
+rm -rf "$TEST_ROOT/out"
+expectStderr 1 nix-store --restore "$TEST_ROOT/out" < duplicate.nar | grepQuiet "NAR directory is not sorted"
+
+# Check whether restoring and dumping a NAR that contains case
+# collisions is round-tripping, even on a case-insensitive system.
+rm -rf "$TEST_ROOT/case"
+opts=("--option" "use-case-hack" "true")
+nix-store "${opts[@]}" --restore "$TEST_ROOT/case" < case.nar
+nix-store "${opts[@]}" --dump "$TEST_ROOT/case" > "$TEST_ROOT/case.nar"
+cmp case.nar "$TEST_ROOT/case.nar"
+[ "$(nix-hash "${opts[@]}" --type sha256 "$TEST_ROOT/case")" = "$(nix-hash --flat --type sha256 case.nar)" ]
+
+# Check whether we detect true collisions (e.g. those remaining after
+# removal of the suffix).
+touch "$TEST_ROOT/case/xt_CONNMARK.h~nix~case~hack~3"
+(! nix-store $opts --dump $TEST_ROOT/case > /dev/null)