From 8ea48dfcd33e8db0c01bf8c57c3bbcfdc3c86d4b Mon Sep 17 00:00:00 2001 From: Lennart Poettering Date: Fri, 13 Jun 2014 12:43:49 +0200 Subject: 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 A subsequent commit adds a new ConditionNeedsUpdate= condition that allows checking on boot whether /etc or /var are outdated and need updating.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. --- src/update-done/Makefile | 1 + 1 file changed, 1 insertion(+) create mode 120000 src/update-done/Makefile (limited to 'src/update-done/Makefile') diff --git a/src/update-done/Makefile b/src/update-done/Makefile new file mode 120000 index 0000000000..d0b0e8e008 --- /dev/null +++ b/src/update-done/Makefile @@ -0,0 +1 @@ +../Makefile \ No newline at end of file -- cgit v1.2.3-54-g00ecf