Test the migration of the user profiles

tests/common.sh.in

@@ -62,7 +62,7 @@ readLink() {
 }
 
 clearProfiles() {
-    profiles="$NIX_STATE_DIR"/profiles
+    profiles="$HOME"/.local/share/nix/profiles
     rm -rf $profiles
 }
 

tests/local.mk

@@ -14,6 +14,7 @@ nix_tests = \
   fetchMercurial.sh \
   gc-auto.sh \
   user-envs.sh \
+  user-envs-migration.sh \
   binary-cache.sh \
   multiple-outputs.sh \
   ca/build.sh \

tests/user-envs-migration.sh

@@ -0,0 +1,35 @@
+# Test that the migration of user environments
+# (https://github.com/NixOS/nix/pull/5226) does preserve everything
+
+source common.sh
+
+if isDaemonNewer "2.4pre20211005"; then
+    exit 99
+fi
+
+
+killDaemon
+unset NIX_REMOTE
+
+clearStore
+clearProfiles
+rm -rf ~/.nix-profile
+
+# Fill the environment using the older Nix
+PATH_WITH_NEW_NIX="$PATH"
+export PATH="$NIX_DAEMON_PACKAGE/bin:$PATH"
+
+nix-env -f user-envs.nix -i foo-1.0
+nix-env -f user-envs.nix -i bar-0.1
+
+# Migrate to the new profile dir, and ensure that everything’s there
+export PATH="$PATH_WITH_NEW_NIX"
+nix-env -q # Trigger the migration
+( [[ -L ~/.nix-profile ]] && \
+    [[ $(readlink ~/.nix-profile) == ~/.local/share/nix/profiles/profile ]] ) || \
+    fail "The nix profile should point to the new location"
+
+(nix-env -q | grep foo && nix-env -q | grep bar && \
+    [[ -e ~/.nix-profile/bin/foo ]] && \
+    [[ $(nix-env --list-generations | wc -l) == 2 ]]) ||
+    fail "The nix profile should have the same content as before the migration"