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initramfs-live-boot: disable systemd-update-done.service on live images

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When systemd is used, it will invoke a service on first boot that triggers
a rebuild of ldconfig caches (rebuild dynamic linker cache).

This is fine on the first boot of a system that has been installed, but it
makes no sense on a live system. The worst part is that rebuilding this
caches is slow and it causes the live system to take longer to boot.
(I measured this in 30 seconds longer on a standard PC system booting
core-image-sato live from an USB memory).

Disable this by touching /etc/.updated and /var/.updated on the live initramfs.

For more details see https://bugzilla.redhat.com/show_bug.cgi?id=1201725 and
https://www.freedesktop.org/software/systemd/man/systemd-update-done.service.html

(From OE-Core rev: d73493e63c506dca0e767ff183ca36bc48c2f03e)

Signed-off-by: Carlos Alberto Lopez Perez <clopez@igalia.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Carlos Alberto Lopez Perez
2017-08-31 14:23:35 +02:00
committed by Richard Purdie
parent 002f49a795
commit 0b79f8d8d1
1 changed files with 4 additions and 0 deletions
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4
meta/recipes-core/initrdscripts/files/init-live.sh
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@@ -84,6 +84,10 @@ boot_live_root() {
# device node creation events were handled, to avoid unexpected behavior
killall -9 "${_UDEV_DAEMON##*/}" 2>/dev/null
# Don't run systemd-update-done on systemd-based live systems
# because it triggers a slow rebuild of ldconfig caches.
touch ${ROOT_MOUNT}/etc/.updated ${ROOT_MOUNT}/var/.updated
# Allow for identification of the real root even after boot
mkdir -p ${ROOT_MOUNT}/media/realroot
mount -n --move "/run/media/${ROOT_DISK}" ${ROOT_MOUNT}/media/realroot