systemd/units/systemd-volatile-root.service.in

#  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=Enforce Volatile Root File Systems
Documentation=man:systemd-volatile-root.service(8)
DefaultDependencies=no
Conflicts=shutdown.target
After=sysroot.mount systemd-repart.service
Before=initrd-root-fs.target shutdown.target
AssertPathExists=/etc/initrd-release

[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=@rootlibexecdir@/systemd-volatile-root yes /sysroot
Add SPDX license headers to unit files 2017-11-18 19:35:03 +03:00			`# SPDX-License-Identifier: LGPL-2.1+`
			`#`
fstab-generator: add support for volatile boots This adds support for a new kernel command line option "systemd.volatile=" that provides the same functionality that systemd-nspawn's --volatile= switch provides, but for host systems (i.e. systems booting with a kernel). It takes the same parameter and has the same effect. In order to implement systemd.volatile=yes a new service systemd-volatile-root.service is introduced that only runs in the initrd and rearranges the root directory as needed to become a tmpfs instance. Note that systemd.volatile=state is implemented different: it simply generates a var.mount unit file that is part of the normal boot and has no effect on the initrd execution. The way this is implemented ensures that other explicit configuration for /var can always override the effect of these options. Specifically, the var.mount unit is generated in the "late" generator directory, so that it only is in effect if nothing else overrides it. 2016-12-13 14:45:19 +03:00			`# 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=Enforce Volatile Root File Systems`
			`Documentation=man:systemd-volatile-root.service(8)`
			`DefaultDependencies=no`
			`Conflicts=shutdown.target`
units: order volatile-root after repart Let's make sure systemd-repart can still see the real device before we replace its mount with an overlay mount, and thus order repart before volatile-root. See: https://lists.freedesktop.org/archives/systemd-devel/2020-July/044896.html 2020-08-10 20:56:17 +03:00			`After=sysroot.mount systemd-repart.service`
fstab-generator: add support for volatile boots This adds support for a new kernel command line option "systemd.volatile=" that provides the same functionality that systemd-nspawn's --volatile= switch provides, but for host systems (i.e. systems booting with a kernel). It takes the same parameter and has the same effect. In order to implement systemd.volatile=yes a new service systemd-volatile-root.service is introduced that only runs in the initrd and rearranges the root directory as needed to become a tmpfs instance. Note that systemd.volatile=state is implemented different: it simply generates a var.mount unit file that is part of the normal boot and has no effect on the initrd execution. The way this is implemented ensures that other explicit configuration for /var can always override the effect of these options. Specifically, the var.mount unit is generated in the "late" generator directory, so that it only is in effect if nothing else overrides it. 2016-12-13 14:45:19 +03:00			`Before=initrd-root-fs.target shutdown.target`
			`AssertPathExists=/etc/initrd-release`

			`[Service]`
			`Type=oneshot`
			`RemainAfterExit=yes`
			`ExecStart=@rootlibexecdir@/systemd-volatile-root yes /sysroot`