Use nix daemon in the test suite

As part of the CLI stabilization effort, the last remaining checkbox (at
the moment) for `nix daemon` is that it "needs testing". This implements
the proposal of using `nix daemon` in place of `nix-daemon` in the test
suite.

tests/functional/build-remote-trustless-should-pass-1.sh

@@ -2,7 +2,7 @@ source common.sh
 
 # Remote trusts us
 file=build-hook.nix
-prog=nix-daemon
+prog='nix%20daemon'
 proto=ssh-ng
 
 source build-remote-trustless.sh

tests/functional/common/vars-and-functions.sh.in

@@ -95,7 +95,7 @@ startDaemon() {
     fi
     # Start the daemon, wait for the socket to appear.
     rm -f $NIX_DAEMON_SOCKET_PATH
-    PATH=$DAEMON_PATH nix-daemon &
+    PATH=$DAEMON_PATH nix --extra-experimental-features 'nix-command' daemon &
     _NIX_TEST_DAEMON_PID=$!
     export _NIX_TEST_DAEMON_PID
     for ((i = 0; i < 300; i++)); do
@@ -148,7 +148,7 @@ fi
 isDaemonNewer () {
   [[ -n "${NIX_DAEMON_PACKAGE:-}" ]] || return 0
   local requiredVersion="$1"
-  local daemonVersion=$($NIX_DAEMON_PACKAGE/bin/nix-daemon --version | cut -d' ' -f3)
+  local daemonVersion=$($NIX_DAEMON_PACKAGE/bin/nix daemon --version | cut -d' ' -f3)
   [[ $(nix eval --expr "builtins.compareVersions ''$daemonVersion'' ''$requiredVersion''") -ge 0 ]]
 }
 

tests/functional/nix-daemon-untrusting.sh

@@ -1,3 +1,3 @@
 #!/bin/sh
 
-exec nix-daemon --force-untrusted "$@"
+exec nix daemon --force-untrusted "$@"

tests/functional/store-info.sh

@@ -6,7 +6,7 @@ STORE_INFO_JSON=$(nix store info --json)
 echo "$STORE_INFO" | grep "Store URL: ${NIX_REMOTE}"
 
 if [[ -v NIX_DAEMON_PACKAGE ]] && isDaemonNewer "2.7.0pre20220126"; then
-    DAEMON_VERSION=$($NIX_DAEMON_PACKAGE/bin/nix-daemon --version | cut -d' ' -f3)
+    DAEMON_VERSION=$($NIX_DAEMON_PACKAGE/bin/nix daemon --version | cut -d' ' -f3)
     echo "$STORE_INFO" | grep "Version: $DAEMON_VERSION"
     [[ "$(echo "$STORE_INFO_JSON" | jq -r ".version")" == "$DAEMON_VERSION" ]]
 fi