diff options
| author | Lennart Poettering <lennart@poettering.net> | 2014-06-13 12:43:49 +0200 |
|---|---|---|
| committer | Lennart Poettering <lennart@poettering.net> | 2014-06-13 13:26:32 +0200 |
| commit | 8ea48dfcd33e8db0c01bf8c57c3bbcfdc3c86d4b (patch) | |
| tree | 474a196fe6cea93499ede05e35af8ba6ae526a65 /units | |
| parent | dc92e62c6c34f242aa54aa187e50a94ed7695c51 (diff) | |
update-done: add minimal tool to manage system updates for /etc and /var, if /usr has changed
In order to support offline updates to /usr, we need to be able to run
certain tasks on next boot-up to bring /etc and /var in line with the
updated /usr. Hence, let's devise a mechanism how we can detect whether
/etc or /var are not up-to-date with /usr anymore: we keep "touch
files" in /etc/.updated and /var/.updated that are mtime-compared with
/usr. This means:
Whenever the vendor OS tree in /usr is updated, and any services that
shall be executed at next boot shall be triggered, it is sufficient to
update the mtime of /usr itself. At next boot, if /etc/.updated and/or
/var/.updated is older than than /usr (or missing), we know we have to
run the update tools once. After that is completed we need to update the
mtime of these files to the one of /usr, to keep track that we made the
necessary updates, and won't repeat them on next reboot.
A subsequent commit adds a new ConditionNeedsUpdate= condition that
allows checking on boot whether /etc or /var are outdated and need
updating.
This is an early step to allow booting up with an empty /etc, with
automatic rebuilding of the necessary cache files or user databases
therein, as well as supporting later updates of /usr that then propagate
to /etc and /var again.
Diffstat (limited to 'units')
| -rw-r--r-- | units/.gitignore | 1 | ||||
| -rw-r--r-- | units/systemd-update-done.service.in | 21 |
2 files changed, 22 insertions, 0 deletions
diff --git a/units/.gitignore b/units/.gitignore index b8c0845956..45ddab72e8 100644 --- a/units/.gitignore +++ b/units/.gitignore @@ -65,6 +65,7 @@ /systemd-udevd.service /systemd-update-utmp-runlevel.service /systemd-update-utmp.service +/systemd-update-done.service /systemd-user-sessions.service /systemd-vconsole-setup.service /user@.service diff --git a/units/systemd-update-done.service.in b/units/systemd-update-done.service.in new file mode 100644 index 0000000000..dccb5137d2 --- /dev/null +++ b/units/systemd-update-done.service.in @@ -0,0 +1,21 @@ +# 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=Update is Completed +Documentation=man:sysusers.d(5) man:systemd-sysusers(8) +DefaultDependencies=no +Conflicts=shutdown.target +After=systemd-readahead-collect.service systemd-readahead-replay.service local-fs.target +Before=sysinit.target shutdown.target +RefuseManualStart=yes +RefuseManualStop=yes + +[Service] +Type=oneshot +RemainAfterExit=yes +ExecStart=@rootlibexecdir@/systemd-update-done |