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SUMMARY = "Volatile bind mount setup and configuration for read-only-rootfs"
DESCRIPTION = "${SUMMARY}"
LICENSE = "MIT"
LIC_FILES_CHKSUM = "file://COPYING.MIT;md5=5750f3aa4ea2b00c2bf21b2b2a7b714d"
SRC_URI = "\
file://mount-copybind \
file://COPYING.MIT \
file://volatile-binds.service.in \
"
S = "${WORKDIR}"
inherit allarch systemd features_check
REQUIRED_DISTRO_FEATURES = "systemd"
VOLATILE_BINDS ?= "\
${localstatedir}/volatile/lib ${localstatedir}/lib\n\
${localstatedir}/volatile/cache ${localstatedir}/cache\n\
${localstatedir}/volatile/spool ${localstatedir}/spool\n\
${localstatedir}/volatile/srv /srv\n\
"
VOLATILE_BINDS[type] = "list"
VOLATILE_BINDS[separator] = "\n"
def volatile_systemd_services(d):
services = []
for line in oe.data.typed_value("VOLATILE_BINDS", d):
if not line:
continue
what, where = line.split(None, 1)
services.append("%s.service" % what[1:].replace("/", "-"))
return " ".join(services)
SYSTEMD_SERVICE:${PN} = "${@volatile_systemd_services(d)}"
FILES:${PN} += "${systemd_system_unitdir}/*.service ${servicedir}"
# Set to 1 to forcibly skip OverlayFS, and default to copy+bind
AVOID_OVERLAYFS = "0"
do_compile () {
while read spec mountpoint; do
if [ -z "$spec" ]; then
continue
fi
servicefile="$(echo "${spec#/}" | tr / -).service"
[ "$mountpoint" != ${localstatedir}/lib ] || var_lib_servicefile=$servicefile
sed -e "s#@what@#$spec#g; s#@where@#$mountpoint#g" \
-e "s#@whatparent@#${spec%/*}#g; s#@whereparent@#${mountpoint%/*}#g" \
-e "s#@avoid_overlayfs@#${@d.getVar('AVOID_OVERLAYFS')}#g" \
volatile-binds.service.in >$servicefile
done <<END
${@d.getVar('VOLATILE_BINDS').replace("\\n", "\n")}
END
if [ -e "$var_lib_servicefile" ]; then
# As the seed is stored under /var/lib, ensure that this service runs
# after the volatile /var/lib is mounted.
sed -i -e "/^Before=/s/\$/ systemd-random-seed.service/" \
-e "/^WantedBy=/s/\$/ systemd-random-seed.service/" \
"$var_lib_servicefile"
fi
}
do_compile[dirs] = "${WORKDIR}"
do_install () {
install -d ${D}${base_sbindir}
install -d ${D}${servicedir}
install -m 0755 mount-copybind ${D}${base_sbindir}/
install -d ${D}${systemd_system_unitdir}
for service in ${SYSTEMD_SERVICE:${PN}}; do
install -m 0644 $service ${D}${systemd_system_unitdir}/
done
# Suppress attempts to process some tmpfiles that are not temporary.
#
install -d ${D}${sysconfdir}/tmpfiles.d ${D}${localstatedir}/cache
ln -s /dev/null ${D}${sysconfdir}/tmpfiles.d/etc.conf
ln -s /dev/null ${D}${sysconfdir}/tmpfiles.d/home.conf
}
do_install[dirs] = "${WORKDIR}"
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