mirror of
https://github.com/freebsd/freebsd-src
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Move description of init_shell, init_script, and init_chroot kenv
tunables from loader(8) to init(8), since it's init that actually uses them. Add .Xrs at their old place. MFC after: 2 weeks Sponsored by: DARPA, AFRL
This commit is contained in:
Edward Tomasz Napierala
parent
e545f5a8a3
commit
fdfbf12784
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=337435
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@ -31,7 +31,7 @@
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.\" @(#)init.8 8.3 (Berkeley) 4/18/94
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.\" $FreeBSD$
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.\"
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.Dd October 3, 2016
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.Dd August 7, 2018
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.Dt INIT 8
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.Os
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.Sh NAME
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@ -294,6 +294,74 @@ as follows:
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.Xr ttys 5
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file
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.El
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.Sh KERNEL ENVIRONMENT VARIABLES
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The following
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.Xr kenv 2
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variables are available as
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.Xr loader 8
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tunables:
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.Bl -tag -width indent
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.It Va init_chroot
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If set to a valid directory in the root file system, it causes
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.Nm
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to perform a
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.Xr chroot 2
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operation on that directory, making it the new root directory.
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That happens before entering single-user mode or multi-user
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mode (but after executing the
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.Va init_script
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if enabled).
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This functionality has generally been eclipsed by rerooting.
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See
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.Xr reboot 8
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.Fl r
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for details.
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.It Va init_script
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If set to a valid file name in the root file system,
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instructs
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.Nm
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to run that script as the very first action,
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before doing anything else.
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Signal handling and exit code interpretation is similar to
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running the
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.Pa /etc/rc
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script.
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In particular, single-user operation is enforced
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if the script terminates with a non-zero exit code,
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or if a SIGTERM is delivered to the
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.Nm
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process (PID 1).
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This functionality has generally been eclipsed by rerooting.
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See
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.Xr reboot 8
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.Fl r
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for details.
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.It Va init_shell
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Defines the shell binary to be used for executing the various shell scripts.
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The default is
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.Dq Li /bin/sh .
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It is used for running the
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.Va init_script
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if set, as well as for the
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.Pa /etc/rc
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and
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.Pa /etc/rc.shutdown
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scripts.
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The value of the corresponding
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.Xr kenv 2
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variable is evaluated every time
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.Nm
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calls a shell script, so it can be changed later on using the
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.Xr kenv 1
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utility.
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In particular, if a non-default shell is used for running an
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.Va init_script ,
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it might be desirable to have that script reset the value of
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.Va init_shell
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back to the default, so that the
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.Pa /etc/rc
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script is executed with the standard shell
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.Pa /bin/sh .
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.Sh FILES
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.Bl -tag -width /var/log/init.log -compact
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.It Pa /dev/console
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@ -24,7 +24,7 @@
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.\"
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.\" $FreeBSD$
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.\"
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.Dd July 30, 2018
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.Dd August 7, 2018
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.Dt LOADER 8
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.Os
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.Sh NAME
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@ -478,20 +478,8 @@ directive from
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has been processed, allowing kernel panics that happen during the early stages
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of boot to be captured.
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.It Va init_chroot
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If set to a valid directory in the root file system, it causes
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.Xr init 8
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to perform a
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.Xr chroot 2
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operation on that directory, making it the new root directory.
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That happens before entering single-user mode or multi-user
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mode (but after executing the
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.Va init_script
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if enabled).
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This functionality has generally been eclipsed by rerooting.
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See
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.Xr reboot 8
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.Fl r
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for details.
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.Xr init 8 .
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.It Va init_path
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Sets the list of binaries which the kernel will try to run as the initial
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process.
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@ -499,51 +487,11 @@ The first matching binary is used.
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The default list is
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.Dq Li /sbin/init:/sbin/oinit:/sbin/init.bak:\:/rescue/init .
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.It Va init_script
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If set to a valid file name in the root file system,
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instructs
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.Xr init 8
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to run that script as the very first action,
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before doing anything else.
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Signal handling and exit code interpretation is similar to
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running the
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.Pa /etc/rc
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script.
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In particular, single-user operation is enforced
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if the script terminates with a non-zero exit code,
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or if a SIGTERM is delivered to the
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.Xr init 8
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process (PID 1).
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This functionality has generally been eclipsed by rerooting.
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See
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.Xr reboot 8
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.Fl r
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for details.
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.Xr init 8 .
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.It Va init_shell
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Defines the shell binary to be used for executing the various shell scripts.
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The default is
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.Dq Li /bin/sh .
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It is used for running the
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.Va init_script
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if set, as well as for the
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.Pa /etc/rc
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and
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.Pa /etc/rc.shutdown
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scripts.
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The value of the corresponding
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.Xr kenv 2
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variable is evaluated every time
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.Xr init 8
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calls a shell script, so it can be changed later on using the
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.Xr kenv 1
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utility.
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In particular, if a non-default shell is used for running an
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.Va init_script ,
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it might be desirable to have that script reset the value of
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.Va init_shell
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back to the default, so that the
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.Pa /etc/rc
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script is executed with the standard shell
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.Pa /bin/sh .
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See
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.Xr init 8 .
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.It Va interpret
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Has the value
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.Dq Li OK
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