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image.bbclass: Empty /var/volatile if it is a mount point 

If /var/volatile is a mount point it shouldn't contain any files before
mount time. If files are there, they will no longer be able to be accessed
once the tmpfs gets mounted at /var/volatile.

This problem can be seen for instance when systemd creates
/var/volatile/log/journal as part of its package installation. It then
assumes the journal is persistent even though /var/volatile/log/journal
goes away shortly thereafter.

This change makes sure that there are no files in /var/volatile if it is
to be used as a mount point.

[Yocto #7388]

(From OE-Core rev: b574ac6f3c9e07f0054ed4261bc1f83583c29c53)

Signed-off-by: Randy Witt <randy.e.witt@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Randy Witt 2015-03-24 10:26:36 -07:00 committed by Richard Purdie
parent 96104b825f
commit d2690754fe
1 changed files with 18 additions and 0 deletions
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18
meta/classes/image.bbclass
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@ -181,6 +181,8 @@ POSTINST_LOGFILE ?= "${localstatedir}/log/postinstall.log"
SYSTEMD_DEFAULT_TARGET ?= '${@bb.utils.contains("IMAGE_FEATURES", "x11-base", "graphical.target", "multi-user.target", d)}'
ROOTFS_POSTPROCESS_COMMAND += '${@bb.utils.contains("DISTRO_FEATURES", "systemd", "set_systemd_default_target; ", "", d)}'
ROOTFS_POSTPROCESS_COMMAND += 'empty_var_volatile;'
# some default locales
IMAGE_LINGUAS ?= "de-de fr-fr en-gb"
@ -377,6 +379,22 @@ set_systemd_default_target () {
fi
}
# If /var/volatile is not empty, we have seen problems where programs such as the
# journal make assumptions based on the contents of /var/volatile. The journal
# would then write to /var/volatile before it was mounted, thus hiding the
# items previously written.
#
# This change is to attempt to fix those types of issues in a way that doesn't
# affect users that may not be using /var/volatile.
empty_var_volatile () {
if [ -e ${IMAGE_ROOTFS}/etc/fstab ]; then
match=`awk '$1 !~ "#" && $2 ~ /\/var\/volatile/{print $2}' ${IMAGE_ROOTFS}/etc/fstab 2> /dev/null`
if [ -n "$match" ]; then
find ${IMAGE_ROOTFS}/var/volatile -mindepth 1 -delete
fi
fi
}
# Turn any symbolic /sbin/init link into a file
remove_init_link () {
if [ -h ${IMAGE_ROOTFS}/sbin/init ]; then