volatile-binds: add recipe
This recipe is designed to play a key role in a read-only rootfs of systemd based systems. It generates service files from a template, volatile-binds.service.in and the VOLATILE_BINDS variable. By default, VOLATILE_BINDS takes the value of "/var/volatile/lib /var/lib\n", which leads to the generation of volatile-var-lib.service file. This file doesn't have any effect in a read-write system, as it has "ConditionPathIsReadWrite = !/var/lib" in the [Unit] section. In other words, this file only has effect in a read-only rootfs. (From OE-Core rev: ed7d30dc0cdb6d6c56c50ac7a3440c4ed0ee70d3) Signed-off-by: Chen Qi <Qi.Chen@windriver.com> Signed-off-by: Saul Wold <sgw@linux.intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
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SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
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THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#!/bin/sh
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#
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# Perform a bind mount, copying existing files as we do so to ensure the
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# overlaid path has the necessary content.
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if [ $# -lt 2 ]; then
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echo >&2 "Usage: $0 spec mountpoint [OPTIONS]"
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exit 1
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fi
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spec=$1
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mountpoint=$2
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if [ $# -gt 2 ]; then
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options=$3
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else
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options=
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fi
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[ -n "$options" ] && options=",$options"
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mkdir -p "${spec%/*}"
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if [ -d "$mountpoint" ]; then
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if [ ! -d "$spec" ]; then
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mkdir "$spec"
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cp -pPR "$mountpoint"/. "$spec/"
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fi
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elif [ -f "$mountpoint" ]; then
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if [ ! -f "$spec" ]; then
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cp -pP "$mountpoint" "$spec"
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fi
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fi
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mount -o "bind$options" "$spec" "$mountpoint"
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[Unit]
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Description=Bind mount volatile @where@
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DefaultDependencies=false
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Before=local-fs.target
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RequiresMountsFor=@whatparent@ @whereparent@
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ConditionPathIsReadWrite=@whatparent@
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ConditionPathExists=@where@
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ConditionPathIsReadWrite=!@where@
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[Service]
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Type=oneshot
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RemainAfterExit=Yes
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StandardOutput=syslog
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TimeoutSec=0
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ExecStart=/sbin/mount-copybind @what@ @where@
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ExecStop=/sbin/umount @where@
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[Install]
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WantedBy=local-fs.target
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SUMMARY = "Volatile bind mount setup and configuration for read-only-rootfs"
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DESCRIPTION = "${SUMMARY}"
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LICENSE = "MIT"
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LIC_FILES_CHKSUM = "file://../COPYING.MIT;md5=5750f3aa4ea2b00c2bf21b2b2a7b714d"
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SRC_URI = "\
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file://mount-copybind \
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file://COPYING.MIT \
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file://volatile-binds.service.in \
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"
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inherit allarch systemd distro_features_check
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REQUIRED_DISTRO_FEATURES = "systemd"
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VOLATILE_BINDS ?= "\
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/var/volatile/lib /var/lib\n\
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"
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VOLATILE_BINDS[type] = "list"
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VOLATILE_BINDS[separator] = "\n"
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def volatile_systemd_services(d):
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services = []
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for line in oe.data.typed_value("VOLATILE_BINDS", d):
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if not line:
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continue
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what, where = line.split(None, 1)
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services.append("%s.service" % what[1:].replace("/", "-"))
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return " ".join(services)
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SYSTEMD_SERVICE_volatile-binds = "${@volatile_systemd_services(d)}"
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FILES_${PN} += "${systemd_unitdir}/system/*.service"
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do_compile () {
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while read spec mountpoint; do
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if [ -z "$spec" ]; then
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continue
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fi
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servicefile="${spec#/}"
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servicefile="$(echo "$servicefile" | tr / -).service"
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sed -e "s#@what@#$spec#g; s#@where@#$mountpoint#g" \
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-e "s#@whatparent@#${spec%/*}#g; s#@whereparent@#${mountpoint%/*}#g" \
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volatile-binds.service.in >$servicefile
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done <<END
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${@d.getVar('VOLATILE_BINDS', True).replace("\\n", "\n")}
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END
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if [ -e var-volatile-lib.service ]; then
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# As the seed is stored under /var/lib, ensure that this service runs
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# after the volatile /var/lib is mounted.
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sed -i -e "/^Before=/s/\$/ systemd-random-seed.service/" \
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-e "/^WantedBy=/s/\$/ systemd-random-seed.service/" \
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var-volatile-lib.service
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fi
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}
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do_compile[dirs] = "${WORKDIR}"
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do_install () {
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install -d ${D}${base_sbindir}
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install -m 0755 mount-copybind ${D}${base_sbindir}/
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install -d ${D}${systemd_unitdir}/system
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for service in ${SYSTEMD_SERVICE_volatile-binds}; do
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install -m 0644 $service ${D}${systemd_unitdir}/system/
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done
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}
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do_install[dirs] = "${WORKDIR}"
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