Merge pull request #47563 from jameysharp/unscripted

Replace several activation script snippets with declarative configuration

nixos/modules/system/activation/activation-script.nix

@@ -128,14 +128,6 @@ in
       ''
         # Various log/runtime directories.
 
-        mkdir -m 0755 -p /run/nix/current-load # for distributed builds
-        mkdir -m 0700 -p /run/nix/remote-stores
-
-        mkdir -m 0755 -p /var/log
-
-        touch /var/log/wtmp /var/log/lastlog # must exist
-        chmod 644 /var/log/wtmp /var/log/lastlog
-
         mkdir -m 1777 -p /var/tmp
 
         # Empty, immutable home directory of many system accounts.

nixos/modules/system/boot/stage-2-init.sh

@@ -152,6 +152,14 @@ ln -sfn /run/booted-system /nix/var/nix/gcroots/booted-system
 @shell@ @postBootCommands@
 
 
+# Ensure systemd doesn't try to populate /etc, by forcing its first-boot
+# heuristic off. It doesn't matter what's in /etc/machine-id for this purpose,
+# and systemd will immediately fill in the file when it starts, so just
+# creating it is enough. This `: >>` pattern avoids forking and avoids changing
+# the mtime if the file already exists.
+: >> /etc/machine-id
+
+
 # Reset the logging file descriptors.
 exec 1>&$logOutFd 2>&$logErrFd
 exec {logOutFd}>&- {logErrFd}>&-

nixos/modules/system/boot/systemd.nix

@@ -747,6 +747,7 @@ in
 
       "systemd/journald.conf".text = ''
         [Journal]
+        Storage=persistent
         RateLimitInterval=${config.services.journald.rateLimitInterval}
         RateLimitBurst=${toString config.services.journald.rateLimitBurst}
         ${optionalString (config.services.journald.console != "") ''
@@ -783,19 +784,6 @@ in
 
     services.dbus.enable = true;
 
-    system.activationScripts.systemd = stringAfter [ "groups" ]
-      ''
-        mkdir -m 0755 -p /var/lib/udev
-
-        if ! [ -e /etc/machine-id ]; then
-          ${systemd}/bin/systemd-machine-id-setup
-        fi
-
-        # Keep a persistent journal. Note that systemd-tmpfiles will
-        # set proper ownership/permissions.
-        mkdir -m 0700 -p /var/log/journal
-      '';
-
     users.users.systemd-network.uid = config.ids.uids.systemd-network;
     users.groups.systemd-network.gid = config.ids.gids.systemd-network;
     users.users.systemd-resolve.uid = config.ids.uids.systemd-resolve;