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author | Lennart Poettering <lennart@poettering.net> | 2014-06-13 12:43:49 +0200 |
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committer | Lennart Poettering <lennart@poettering.net> | 2014-06-13 13:26:32 +0200 |
commit | 8ea48dfcd33e8db0c01bf8c57c3bbcfdc3c86d4b (patch) | |
tree | 474a196fe6cea93499ede05e35af8ba6ae526a65 /units/systemd-journal-catalog-update.service.in | |
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allows checking on boot whether /etc or /var are outdated and need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/systemd-journal-catalog-update.service.in')
0 files changed, 0 insertions, 0 deletions