Merge fort-nix/nix-bitcoin#508: More NixOS 22.05 fixes

7261813051 examples/configuration.nix: use `system.stateVersion` comment from NixOS 22.05 (Erik Arvstedt)
2ae2eea54e run-tests: fix command `debug` on NixOS 22.05 (Erik Arvstedt)
a8255d61d7 lib/make-container: update required extra-container version (Erik Arvstedt)
f02f27cbca lib/make-test: fix `system.stateVersion` warning (Erik Arvstedt)

Pull request description:

ACKs for top commit:
  jonasnick:
    ACK 7261813051

Tree-SHA512: ae6d15092666187dfb9eca6a307ee2533446e49265390315b74d00b848b072339e522308ed88751d09631cc064c0f7fd34084add38ca52c130153a4ebc527549

examples/configuration.nix

@@ -270,10 +270,12 @@
   # FIXME: Add custom options (like boot options, output of
   # nixos-generate-config, etc.):
 
-  # This value determines the NixOS release with which your system is to be
-  # compatible, in order to avoid breaking some software such as database
-  # servers. You should change this only after NixOS release notes say you
-  # should.
+  # This value determines the NixOS release from which the default
+  # settings for stateful data, like file locations and database versions
+  # on your system were taken. It's perfectly fine and recommended to leave
+  # this value at the release version of the first install of this system.
+  # Before changing this value read the documentation for this option
+  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
   system.stateVersion = "22.05"; # Did you read the comment?
 
   # The nix-bitcoin release version that your config is compatible with.

test/lib/make-container.sh

@@ -77,8 +77,8 @@ while [[ $# > 0 ]]; do
 done
 
 containerBin=$(type -P extra-container) || true
-if [[ ! ($containerBin && $(realpath $containerBin) == *extra-container-0.8*) ]]; then
-    echo "Building extra-container. Skip this step by adding extra-container 0.8 to PATH."
+if [[ ! ($containerBin && $(realpath $containerBin) == *extra-container-0.10*) ]]; then
+    echo "Building extra-container. Skip this step by adding extra-container 0.10 to PATH."
     nix-build --out-link /tmp/extra-container "$scriptDir"/../pkgs \
       -A pinned.extra-container >/dev/null
     export PATH="/tmp/extra-container/bin${PATH:+:}$PATH"

test/lib/make-test.nix

@@ -64,7 +64,7 @@ name: testConfig:
 
   # This allows running a test scenario in a regular NixOS VM.
   # No tests are executed.
-  vmWithoutTests = (pkgs.nixos {
+  vmWithoutTests = (pkgs.nixos ({ config, ... }: {
     imports = [
       testConfig
       "${toString pkgs.path}/nixos/modules/virtualisation/qemu-vm.nix"
@@ -78,7 +78,9 @@ name: testConfig:
          echo o >/proc/sysrq-trigger
        ''))
     ];
-  }).vm;
+
+    system.stateVersion = config.system.nixos.release;
+  })).config.system.build.vm;
 
   config = testConfig;
 }

test/run-tests.sh

@@ -135,15 +135,17 @@ run() {
         echo "Running interactive testing environment"
         tests=$(
             echo 'is_interactive = True'
-            echo 'exec(os.environ["testScript"])'
+            echo 'exec(open(os.environ["testScript"]).read())'
             # Start VM
             echo 'start_all()'
-            # Start REPL
+            # Start REPL.
+            # Use `code.interact` for the REPL instead of the builtin test driver REPL
+            # because it supports low featured terminals like Emacs' shell-mode.
             echo 'import code'
             echo 'code.interact(local=globals())'
         )
     else
-        tests='exec(os.environ["testScript"])'
+        tests='exec(open(os.environ["testScript"]).read())'
     fi
 
     echo "VM stats: CPUs: $numCPUs, memory: $memoryMiB MiB"
@@ -154,10 +156,9 @@ run() {
         TMPDIR="$TMPDIR" \
         USE_TMPDIR=1 \
         NIX_DISK_IMAGE=$TMPDIR/img.qcow2 \
-        tests="$tests" \
         QEMU_OPTS="-smp $numCPUs -m $memoryMiB -nographic $QEMU_OPTS"  \
         QEMU_NET_OPTS="$QEMU_NET_OPTS" \
-        $TMPDIR/driver/bin/nixos-test-driver
+        $TMPDIR/driver/bin/nixos-test-driver <(echo "$tests")
 }
 
 debug() {