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 A subsequent commit adds a new ConditionNeedsUpdate= condition that allows checking on boot whether /etc or /var are outdated and need updating.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. --- Makefile.am | 24 ++++++++++++++++++++---- 1 file changed, 20 insertions(+), 4 deletions(-) (limited to 'Makefile.am') diff --git a/Makefile.am b/Makefile.am index 894d445fa2..8fd933be51 100644 --- a/Makefile.am +++ b/Makefile.am @@ -361,7 +361,8 @@ rootlibexec_PROGRAMS = \ systemd-sysctl \ systemd-sleep \ systemd-bus-proxyd \ - systemd-socket-proxyd + systemd-socket-proxyd \ + systemd-update-done systemgenerator_PROGRAMS = \ systemd-getty-generator \ @@ -495,7 +496,8 @@ nodist_systemunit_DATA = \ units/initrd-cleanup.service \ units/initrd-udevadm-cleanup-db.service \ units/initrd-switch-root.service \ - units/systemd-nspawn@.service + units/systemd-nspawn@.service \ + units/systemd-update-done.service dist_userunit_DATA = \ units/user/basic.target \ @@ -538,7 +540,8 @@ EXTRA_DIST += \ units/initrd-cleanup.service.in \ units/initrd-udevadm-cleanup-db.service.in \ units/initrd-switch-root.service.in \ - units/systemd-nspawn@.service.in + units/systemd-nspawn@.service.in \ + units/systemd-update-done.service.in CLEANFILES += \ units/console-shell.service.m4 \ @@ -1640,6 +1643,14 @@ systemd_update_utmp_LDADD = \ libsystemd-shared.la \ $(AUDIT_LIBS) +# ------------------------------------------------------------------------------ +systemd_update_done_SOURCES = \ + src/update-done/update-done.c + +systemd_update_done_LDADD = \ + libsystemd-internal.la \ + libsystemd-shared.la + # ------------------------------------------------------------------------------ systemd_shutdownd_SOURCES = \ src/shutdownd/shutdownd.c @@ -5100,14 +5111,19 @@ RUNLEVEL4_TARGET_WANTS += \ RUNLEVEL5_TARGET_WANTS += \ systemd-update-utmp-runlevel.service endif + SYSINIT_TARGET_WANTS += \ - systemd-update-utmp.service + systemd-update-utmp.service \ + systemd-update-done.service + LOCAL_FS_TARGET_WANTS += \ systemd-remount-fs.service \ tmp.mount + MULTI_USER_TARGET_WANTS += \ getty.target \ systemd-ask-password-wall.path + SYSINIT_TARGET_WANTS += \ dev-hugepages.mount \ dev-mqueue.mount \ -- cgit v1.2.3-54-g00ecf