From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chris Lesiak Date: Mon, 30 Apr 2018 12:14:11 -0500 Subject: [Buildroot] [PATCH v2] Makefile: Update mtime of $(TARGET_DIR)/usr in target-finalize In-Reply-To: <20180416153339.23002-1-chris.lesiak@licor.com> References: <20180416153339.23002-1-chris.lesiak@licor.com> Message-ID: <20180430171411.21920-1-chris.lesiak@licor.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: buildroot@busybox.net The systemd ConditionNeedsUpdate option is useful when offline updates of the vendor operating system resources in /usr require updating of /etc or /var on the next following boot. Two examples of services making use of this option are systemd-hwdb-update.service and systemd-sysusers.service. ConditionNeedsUpdate=/etc will be true if the mtime of /etc/.updated is older than the mtime of /usr. After services conditional on ConditionNeedsUpdate have run, systemd-update-done.service will synch the mtime of /usr to /etc/.updated so that the condition will be false on subsequent boots. For systems with writable /usr partitions where updates are done to the running system, the update program will touch /usr as a final step. But with Buildroot, where updates are often done by dumping a new image onto the device, and where /usr is on a filesystem mounted read-only, touching /usr as part of the update process is not practical. Instead, it should be done a build time. For testers, please note that systemd-update-done in v234 added a regression where the mtime of /etc/.updated is set to the current time instead of the mtime or /usr. This will be fixed in v239. For more details, see: http://0pointer.de/public/systemd-man/systemd.unit.html http://0pointer.de/public/systemd-man/systemd-update-done.service.html Signed-off-by: Chris Lesiak Reviewed-by: "Yann E. MORIN" --- Changed v1 --> v2 - Provide a more detailed commit message. --- Makefile | 2 ++ 1 file changed, 2 insertions(+) diff --git a/Makefile b/Makefile index 8004cc2925..479ce74dc1 100644 --- a/Makefile +++ b/Makefile @@ -761,6 +761,8 @@ endif $(call MESSAGE,"Executing post-build script $(s)"); \ $(EXTRA_ENV) $(s) $(TARGET_DIR) $(call qstrip,$(BR2_ROOTFS_POST_SCRIPT_ARGS))$(sep)) + touch $(TARGET_DIR)/usr + .PHONY: target-post-image target-post-image: $(TARGETS_ROOTFS) target-finalize @$(foreach s, $(call qstrip,$(BR2_ROOTFS_POST_IMAGE_SCRIPT)), \ -- 2.14.3