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

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

[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart={{LIBEXECDIR}}/systemd-volatile-root yes /sysroot
license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 07:23:58 +03:00			`# SPDX-License-Identifier: LGPL-2.1-or-later`
Add SPDX license headers to unit files 2017-11-18 19:35:03 +03:00			`#`
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`
fstab-generator: if usr= is specified, mount it to /sysusr/usr/ first This changes the fstab-generator to handle mounting of /usr/ a bit differently than before. Instead of immediately mounting the fs to /sysroot/usr/ we'll first mount it to /sysusr/usr/ and then add a separate bind mount that mounts it from /sysusr/usr/ to /sysroot/usr/. This way we can access /usr independently of the root fs, without for waiting to be mounted via the /sysusr/ hierarchy. This is useful for invoking systemd-repart while a root fs doesn't exist yet and for creating it, with partition data read from the /usr/ hierarchy. This introduces a new generic target initrd-usr-fs.target that may be used to generically order services against /sysusr/ to become available. 2021-03-27 00:40:40 +03:00			`After=sysroot.mount sysroot-usr.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`
Drop split-usr and unmerged-usr support As previously announced, execute order 66: https://lists.freedesktop.org/archives/systemd-devel/2022-September/048352.html The meson options split-usr, rootlibdir and rootprefix become no-ops that print a warning if they are set to anything other than the default values. We can remove them in a future release. 2023-06-12 04:15:19 +03:00			`ExecStart={{LIBEXECDIR}}/systemd-volatile-root yes /sysroot`