Make initrd.target the default target in the initrd

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

6 files changed, 27 insertions, 7 deletions

diff --git a/units/initrd-cleanup.service.in b/units/initrd-cleanup.service.in
index 5bef090e0..218ec807f 100644
--- a/units/initrd-cleanup.service.in
+++ b/units/initrd-cleanup.service.in
@@ -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
diff --git a/units/initrd-fs.target b/units/initrd-fs.target
index 6ba1758e4..7578b8824 100644
--- a/units/initrd-fs.target
+++ b/units/initrd-fs.target
@@ -11,3 +11,4 @@ Documentation=man:systemd.special(7)
 OnFailure=emergency.target
 OnFailureIsolate=yes
 ConditionPathExists=/etc/initrd-release
+After=initrd-parse-etc.service
diff --git a/units/initrd-parse-etc.service.in b/units/initrd-parse-etc.service.in
index 44fee7bd3..07728e200 100644
--- a/units/initrd-parse-etc.service.in
+++ b/units/initrd-parse-etc.service.in
@@ -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
diff --git a/units/root-fs.target b/units/initrd-root-fs.target
index 13515341e..cd189f029 100644
--- a/units/root-fs.target
+++ b/units/initrd-root-fs.target
@@ -9,3 +9,5 @@
 Description=Initrd Root File System
 Documentation=man:systemd.special(7)
 ConditionPathExists=/etc/initrd-release
+OnFailure=emergency.target
+OnFailureIsolate=yes
diff --git a/units/initrd-switch-root.target b/units/initrd-switch-root.target
index cf646c4ef..f34768790 100644
--- a/units/initrd-switch-root.target
+++ b/units/initrd-switch-root.target
@@ -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
diff --git a/units/initrd.target b/units/initrd.target
new file mode 100644
index 000000000..5622de477
--- /dev/null
+++ b/units/initrd.target
@@ -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