units: introduce systemd-tmpfiles-setup-dev-early.service

This makes tmpfiles, sysusers, and udevd invoked in the following order:
1. systemd-tmpfiles-setup-dev-early.service
   Create device nodes gracefully, that is, create device nodes anyway
   by ignoring unknown users and groups.
2. systemd-sysusers.service
   Create users and groups, to make later invocations of tmpfiles and
   udevd can resolve necessary users and groups.
3. systemd-tmpfiles-setup-dev.service
   Adjust owners of previously created device nodes.
4. systemd-udevd.service
   Process all devices. Especially to make block devices active and can
   be mountable.
5. systemd-tmpfiles-setup.service
   Setup basic filesystem.

Follow-up for b42482af904ae0b94a6e4501ec595448f0ba1c06.

Fixes #28653.
Replaces #28681 and #28732.

1 files changed, 25 insertions, 0 deletions

diff --git a/units/systemd-tmpfiles-setup-dev-early.service b/units/systemd-tmpfiles-setup-dev-early.service
new file mode 100644
index 0000000000..0d6f0daaae
--- /dev/null
+++ b/units/systemd-tmpfiles-setup-dev-early.service
@@ -0,0 +1,25 @@
+#  SPDX-License-Identifier: LGPL-2.1-or-later
+#
+#  This file is part of systemd.
+#
+#  systemd is free software; you can redistribute it and/or modify it
+#  under the terms of the GNU Lesser General Public License as published by
+#  the Free Software Foundation; either version 2.1 of the License, or
+#  (at your option) any later version.
+
+[Unit]
+Description=Create Static Device Nodes in /dev gracefully
+Documentation=man:tmpfiles.d(5) man:systemd-tmpfiles(8)
+
+DefaultDependencies=no
+Before=sysinit.target local-fs-pre.target systemd-udevd.service
+Wants=local-fs-pre.target
+Conflicts=shutdown.target initrd-switch-root.target
+Before=shutdown.target initrd-switch-root.target
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart=systemd-tmpfiles --prefix=/dev --create --boot --graceful
+SuccessExitStatus=DATAERR CANTCREAT
+ImportCredential=tmpfiles.*