units: add unit file for systemd-repart to automatically run at boot

units/meson.build

@@ -220,6 +220,8 @@ in_units = [
          'multi-user.target.wants/'],
         ['systemd-vconsole-setup.service',       'ENABLE_VCONSOLE'],
         ['systemd-volatile-root.service',        ''],
+        ['systemd-repart.service',               'ENABLE_REPART',
+         'sysinit.target.wants/ initrd-root-fs.target.wants/'],
         ['user-runtime-dir@.service',            ''],
         ['user@.service',                        ''],
 ]

units/systemd-repart.service.in

@@ -0,0 +1,25 @@
+#  SPDX-License-Identifier: LGPL-2.1+
+#
+#  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=Repartition Root Disk
+Documentation=man:systemd-repart.service(8)
+DefaultDependencies=no
+Conflicts=shutdown.target
+After=sysroot.mount
+Before=initrd-root-fs.target shutdown.target
+ConditionVirtualization=!container
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart=@rootbindir@/systemd-repart --dry-run=no
+
+# The tool returns 77 if there's no GPT partition table pre-existing
+SuccessExitStatus=77