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Make initrd.target the default target in the initrd

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First, rename root-fs.target to initrd-root-fs.target to clarify its usage.

Mount units with "x-initrd-rootfs.mount" are now ordered before
initrd-root-fs.target. As we sometimes construct /sysroot mounts in
/etc/fstab in the initrd, we want these to be mounted before the
initrd-root-fs.target is active.

initrd.target can be the default target in the initrd.

                             (normal startup)
                                    :
                                    :
                                    v
                              basic.target
                                    |
             ______________________/|
            /                       |
            |                  sysroot.mount
            |                       |
            |                       v
            |             initrd-root-fs.target
            |                       |
            |                       v
            |            initrd-parse-etc.service
(custom initrd services)            |
            |                       v
            |            (sysroot-usr.mount and
            |             various mounts marked
            |               with fstab option
            |                x-initrd.mount)
            |                       |
            |                       v
            |                initrd-fs.target
            |                       |
            \______________________ |
                                   \|
                                    v
                               initrd.target
                                    |
                                    v
                          initrd-cleanup.service
                               isolates to
                         initrd-switch-root.target
                                    |
                                    v
             ______________________/|
            /                       |
            |        initrd-udevadm-cleanup-db.service
            |                       |
(custom initrd services)            |
            |                       |
            \______________________ |
                                   \|
                                    v
                        initrd-switch-root.target
                                    |
                                    v
                        initrd-switch-root.service
                                    |
                                    v
                               switch-root
This commit is contained in:
Harald Hoyer 2013-03-14 13:12:10 +01:00
parent c1dae1b3c9
commit 9e5f0f9291
11 changed files with 115 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
Makefile.am
View File

@ -347,8 +347,9 @@ dist_systemunit_DATA = \
units/kexec.target \
units/local-fs.target \
units/local-fs-pre.target \
units/initrd.target \
units/initrd-fs.target \
units/root-fs.target \
units/initrd-root-fs.target \
units/remote-fs.target \
units/remote-fs-pre.target \
units/network.target \

73
man/bootup.xml
View File

@ -173,6 +173,79 @@
to them.</para>
</refsect1>
<refsect1>
<title>Systemd in the Initrd</title>
<para>If the initrd creation tool used the services provided
by systemd, the default target in the initrd is the
initrd-fs.target. The process is the same as above until the basic.target is reached.
Systemd now continues to the initrd.target. If the root device could be mounted
on /sysroot, the sysroot.mount unit is active and the initrd-root-fs.target is reached.
initrd-parse-etc.service scans /sysroot/etc/fstab for the /usr mountpoint and for entries
marked with the <emphasis>x-initrd.mount</emphasis> option set. If these mountpoint are
mounted in /sysroot, the initrd-fs.target is reached.
The initrd-cleanup.service isolates to the initrd-switch-root.target,
where cleanup services can run. At the very last end
initrd-switch-root.service is activated, which will cause
the system to switch root to /sysroot.
</para>
<programlisting>
(same as above)
:
:
v
basic.target
| emergency.service
______________________/| |
/ | v
| sysroot.mount <emphasis>emergency.target</emphasis>
| |
| v
| initrd-root-fs.target
| |
| v
| initrd-parse-etc.service
(custom initrd services) |
| v
| (sysroot-usr.mount and
| various mounts marked
| with fstab option
| x-initrd.mount)
| |
| v
| initrd-fs.target
| |
\______________________ |
\|
v
initrd.target
|
v
initrd-cleanup.service
isolates to
initrd-switch-root.target
|
v
______________________/|
/ |
| initrd-udevadm-cleanup-db.service
| |
(custom initrd services) |
| |
\______________________ |
\|
v
initrd-switch-root.target
|
v
initrd-switch-root.service
|
v
switch-root
</programlisting>
</refsect1>
<refsect1>
<title>System Manager Shutdown</title>

4
man/systemd.special.xml
View File

@ -79,7 +79,7 @@
<filename>remote-fs.target</filename>,
<filename>remote-fs-pre.target</filename>,
<filename>rescue.target</filename>,
<filename>root-fs.target</filename>,
<filename>initrd-root-fs.target</filename>,
<filename>rpcbind.target</filename>,
<filename>runlevel2.target</filename>,
<filename>runlevel3.target</filename>,
@ -523,7 +523,7 @@
</listitem>
</varlistentry>
<varlistentry>
<term><filename>root-fs.target</filename></term>
<term><filename>initrd-root-fs.target</filename></term>
<listitem>
<para>systemd automatically
adds dependencies of type

2
src/core/special.h
View File

@ -49,7 +49,7 @@
#define SPECIAL_LOCAL_FS_TARGET "local-fs.target"
#define SPECIAL_LOCAL_FS_PRE_TARGET "local-fs-pre.target"
#define SPECIAL_INITRD_FS_TARGET "initrd-fs.target"
#define SPECIAL_ROOT_FS_TARGET "root-fs.target"
#define SPECIAL_INITRD_ROOT_FS_TARGET "initrd-root-fs.target"
#define SPECIAL_REMOTE_FS_TARGET "remote-fs.target" /* LSB's $remote_fs */
#define SPECIAL_REMOTE_FS_PRE_TARGET "remote-fs-pre.target"
#define SPECIAL_SWAP_TARGET "swap.target"

11
src/fstab-generator/fstab-generator.c
View File

@ -199,6 +199,12 @@ static bool mount_in_initrd(struct mntent *me) {
streq(me->mnt_dir, "/usr");
}
static bool mount_is_rootfs(struct mntent *me) {
assert(me);
return hasmntopt(me, "x-initrd-rootfs.mount");
}
static int add_mount(const char *what, const char *where, const char *type, const char *opts,
int passno, bool noauto, bool nofail, bool automount, bool isbind,
const char *pre, const char *post, const char *source) {
@ -434,6 +440,9 @@ static int parse_fstab(const char *prefix, bool initrd) {
if (initrd) {
post = SPECIAL_INITRD_FS_TARGET;
pre = NULL;
} else if (mount_is_rootfs(me)) {
post = SPECIAL_INITRD_ROOT_FS_TARGET;
pre = NULL;
} else if (mount_is_network(me)) {
post = SPECIAL_REMOTE_FS_TARGET;
pre = SPECIAL_REMOTE_FS_PRE_TARGET;
@ -525,7 +534,7 @@ static int parse_new_root_from_proc_cmdline(void) {
log_debug("Found entry what=%s where=/sysroot type=%s", what, type);
r = add_mount(what, "/sysroot", type, opts, 0, false, false, false,
false, NULL, SPECIAL_ROOT_FS_TARGET, "/proc/cmdline");
false, NULL, SPECIAL_INITRD_ROOT_FS_TARGET, "/proc/cmdline");
return (r < 0) ? r : 0;
}

3
units/initrd-cleanup.service.in
View File

@ -10,8 +10,7 @@ Description=Cleaning Up and Shutting Down Daemons
DefaultDependencies=no
ConditionPathExists=/etc/initrd-release
OnFailure=emergency.target
Wants=root-fs.target initrd-fs.target
After=root-fs.target initrd-fs.target
After=initrd-root-fs.target initrd-fs.target initrd.target
[Service]
Type=oneshot

1
units/initrd-fs.target
View File

@ -11,3 +11,4 @@ Documentation=man:systemd.special(7)
OnFailure=emergency.target
OnFailureIsolate=yes
ConditionPathExists=/etc/initrd-release
After=initrd-parse-etc.service

7
units/initrd-parse-etc.service.in
View File

@ -8,13 +8,14 @@
[Unit]
Description=Reload Configuration from the Real Root
DefaultDependencies=no
Requires=root-fs.target
After=root-fs.target
Requires=initrd-root-fs.target
After=initrd-root-fs.target
OnFailure=emergency.target
ConditionPathExists=/etc/initrd-release
[Service]
Type=oneshot
ExecStartPre=@rootbindir@/systemctl daemon-reload
ExecStart=@rootbindir@/systemctl start initrd-fs.target
# we have to retrigger initrd-fs.target after daemon-reload
ExecStart=-@rootbindir@/systemctl --no-block start initrd-fs.target
ExecStart=@rootbindir@/systemctl --no-block start initrd-cleanup.service

2
units/root-fs.target → units/initrd-root-fs.target
View File

@ -9,3 +9,5 @@
Description=Initrd Root File System
Documentation=man:systemd.special(7)
ConditionPathExists=/etc/initrd-release
OnFailure=emergency.target
OnFailureIsolate=yes

4
units/initrd-switch-root.target
View File

@ -12,5 +12,5 @@ DefaultDependencies=no
Requires=initrd-switch-root.service
Before=initrd-switch-root.service
AllowIsolate=yes
Wants=initrd-udevadm-cleanup-db.service root-fs.target initrd-fs.target systemd-journald.service
After=initrd-udevadm-cleanup-db.service root-fs.target initrd-fs.target emergency.service emergency.target
Wants=initrd-udevadm-cleanup-db.service initrd-root-fs.target initrd-fs.target systemd-journald.service
After=initrd-udevadm-cleanup-db.service initrd-root-fs.target initrd-fs.target emergency.service emergency.target

17
units/initrd.target Normal file
View File

@ -0,0 +1,17 @@
# 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=Initrd Target
Documentation=man:systemd.special(7)
OnFailure=emergency.target
OnFailureIsolate=yes
ConditionPathExists=/etc/initrd-release
Requires=basic.target
Wants=initrd-root-fs.target initrd-fs.target initrd-parse-etc.service
After=initrd-root-fs.target initrd-fs.target basic.target rescue.service rescue.target
AllowIsolate=yes