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man: document that systemctl -ff reboot does not require PID 1 to work (#3310)

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As suggested in

https://github.com/systemd/systemd/issues/3282#issuecomment-220264509
This commit is contained in:
Lennart Poettering 2016-05-31 01:49:57 +02:00 committed by Evgeny Vereshchagin
parent c6f8d17de0
commit 924e44b419
1 changed files with 37 additions and 43 deletions
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80
man/systemctl.xml
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@ -481,19 +481,16 @@
<para>When used with <command>enable</command>, overwrite
any existing conflicting symlinks.</para>
<para>When used with <command>halt</command>,
<command>poweroff</command>, <command>reboot</command> or
<command>kexec</command>, execute the selected operation
without shutting down all units. However, all processes will
be killed forcibly and all file systems are unmounted or
remounted read-only. This is hence a drastic but relatively
safe option to request an immediate reboot. If
<option>--force</option> is specified twice for these
operations, they will be executed immediately without
terminating any processes or unmounting any file
systems. Warning: specifying <option>--force</option> twice
with any of these operations might result in data
loss.</para>
<para>When used with <command>halt</command>, <command>poweroff</command>, <command>reboot</command> or
<command>kexec</command>, execute the selected operation without shutting down all units. However, all
processes will be killed forcibly and all file systems are unmounted or remounted read-only. This is hence a
drastic but relatively safe option to request an immediate reboot. If <option>--force</option> is specified
twice for these operations (with the exception of <command>kexec</command>), they will be executed
immediately, without terminating any processes or unmounting any file systems. Warning: specifying
<option>--force</option> twice with any of these operations might result in data loss. Note that when
<option>--force</option> is specified twice the selected operation is executed by
<command>systemctl</command> itself, and the system manager is not contacted. This means the command should
succeed even when the system manager hangs or crashed.</para>
</listitem>
</varlistentry>
@ -1602,48 +1599,45 @@ kobject-uevent 1 systemd-udevd-kernel.socket systemd-udevd.service
<term><command>halt</command></term>
<listitem>
<para>Shut down and halt the system. This is mostly equivalent to
<command>start halt.target --job-mode=replace-irreversibly</command>, but also
prints a wall message to all users. If combined with
<option>--force</option>, shutdown of all running services is
skipped, however all processes are killed and all file
systems are unmounted or mounted read-only, immediately
followed by the system halt. If <option>--force</option> is
specified twice, the operation is immediately executed
without terminating any processes or unmounting any file
systems. This may result in data loss.</para>
<para>Shut down and halt the system. This is mostly equivalent to <command>start halt.target
--job-mode=replace-irreversibly</command>, but also prints a wall message to all users. If combined with
<option>--force</option>, shutdown of all running services is skipped, however all processes are killed and
all file systems are unmounted or mounted read-only, immediately followed by the system halt. If
<option>--force</option> is specified twice, the operation is immediately executed without terminating any
processes or unmounting any file systems. This may result in data loss. Note that when
<option>--force</option> is specified twice the halt operation is executed by
<command>systemctl</command> itself, and the system manager is not contacted. This means the command should
succeed even when the system manager hangs or crashed.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><command>poweroff</command></term>
<listitem>
<para>Shut down and power-off the system. This is mostly
equivalent to <command>start poweroff.target --job-mode=replace-irreversibly</command>,
but also prints a wall message to all users. If combined with
<option>--force</option>, shutdown of all running services is
skipped, however all processes are killed and all file
systems are unmounted or mounted read-only, immediately
followed by the powering off. If <option>--force</option> is
specified twice, the operation is immediately executed
without terminating any processes or unmounting any file
systems. This may result in data loss.</para>
<para>Shut down and power-off the system. This is mostly equivalent to <command>start poweroff.target
--job-mode=replace-irreversibly</command>, but also prints a wall message to all users. If combined with
<option>--force</option>, shutdown of all running services is skipped, however all processes are killed and
all file systems are unmounted or mounted read-only, immediately followed by the powering off. If
<option>--force</option> is specified twice, the operation is immediately executed without terminating any
processes or unmounting any file systems. This may result in data loss. Note that when
<option>--force</option> is specified twice the power-off operation is executed by
<command>systemctl</command> itself, and the system manager is not contacted. This means the command should
succeed even when the system manager hangs or crashed.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><command>reboot <optional><replaceable>arg</replaceable></optional></command></term>
<listitem>
<para>Shut down and reboot the system. This is mostly
equivalent to <command>start reboot.target --job-mode=replace-irreversibly</command>,
but also prints a wall message to all users. If combined with
<option>--force</option>, shutdown of all running services is
skipped, however all processes are killed and all file
systems are unmounted or mounted read-only, immediately
followed by the reboot. If <option>--force</option> is
specified twice, the operation is immediately executed
without terminating any processes or unmounting any file
systems. This may result in data loss.</para>
<para>Shut down and reboot the system. This is mostly equivalent to <command>start reboot.target
--job-mode=replace-irreversibly</command>, but also prints a wall message to all users. If combined with
<option>--force</option>, shutdown of all running services is skipped, however all processes are killed and
all file systems are unmounted or mounted read-only, immediately followed by the reboot. If
<option>--force</option> is specified twice, the operation is immediately executed without terminating any
processes or unmounting any file systems. This may result in data loss. Note that when
<option>--force</option> is specified twice the reboot operation is executed by
<command>systemctl</command> itself, and the system manager is not contacted. This means the command should
succeed even when the system manager hangs or crashed.</para>
<para>If the optional argument
<replaceable>arg</replaceable> is given, it will be passed