Remove obsolete /nix/var/nix/{manifests,channel-cache}

doc/languages-frameworks/haskell.md

@@ -689,9 +689,7 @@ might be necessary to purge the local caches that store data from those
 machines to disable these binary channels for the duration of the previous
 command, i.e. by running:
 ```shell
-rm /nix/var/nix/binary-cache-v3.sqlite
-rm /nix/var/nix/manifests/*
-rm /nix/var/nix/channel-cache/*
+rm ~/.cache/nix/binary-cache*.sqlite
 ```
 
 ### Builds on Darwin fail with `math.h` not found

lib/tests/release.nix

@@ -13,7 +13,6 @@ pkgs.stdenv.mkDerivation {
     export NIX_DB_DIR=$TEST_ROOT/db
     export NIX_LOCALSTATE_DIR=$TEST_ROOT/var
     export NIX_LOG_DIR=$TEST_ROOT/var/log/nix
-    export NIX_MANIFESTS_DIR=$TEST_ROOT/var/nix/manifests
     export NIX_STATE_DIR=$TEST_ROOT/var/nix
     export NIX_STORE_DIR=$TEST_ROOT/store
     export PAGER=cat

nixos/modules/services/misc/nix-daemon.nix

@@ -445,12 +445,10 @@ in
         mkdir -m 0755 -p \
           /nix/var/nix/gcroots \
           /nix/var/nix/temproots \
-          /nix/var/nix/manifests \
           /nix/var/nix/userpool \
           /nix/var/nix/profiles \
           /nix/var/nix/db \
-          /nix/var/log/nix/drvs \
-          /nix/var/nix/channel-cache
+          /nix/var/log/nix/drvs
         mkdir -m 1777 -p \
           /nix/var/nix/gcroots/per-user \
           /nix/var/nix/profiles/per-user \