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author | Chen Qi <Qi.Chen@windriver.com> | 2014-07-23 05:40:12 -0400 |
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committer | Richard Purdie <richard.purdie@linuxfoundation.org> | 2014-08-02 09:26:14 +0100 |
commit | db15e2d01c48786326ee13dd09b7f2dd45f53116 (patch) | |
tree | 85aaa9c06c70204977ffd5c8624e9a93f6c98849 /meta/recipes-core/volatile-binds/files | |
parent | 3b19f90bdfca520a6e00057cacb103f8a55feac6 (diff) | |
download | ast2050-yocto-poky-db15e2d01c48786326ee13dd09b7f2dd45f53116.zip ast2050-yocto-poky-db15e2d01c48786326ee13dd09b7f2dd45f53116.tar.gz |
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>
Diffstat (limited to 'meta/recipes-core/volatile-binds/files')
3 files changed, 70 insertions, 0 deletions
diff --git a/meta/recipes-core/volatile-binds/files/COPYING.MIT b/meta/recipes-core/volatile-binds/files/COPYING.MIT new file mode 100644 index 0000000..7e7d574 --- /dev/null +++ b/meta/recipes-core/volatile-binds/files/COPYING.MIT @@ -0,0 +1,17 @@ +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT +SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, +DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR +OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR +THE USE OR OTHER DEALINGS IN THE SOFTWARE. diff --git a/meta/recipes-core/volatile-binds/files/mount-copybind b/meta/recipes-core/volatile-binds/files/mount-copybind new file mode 100755 index 0000000..2aeaf84 --- /dev/null +++ b/meta/recipes-core/volatile-binds/files/mount-copybind @@ -0,0 +1,34 @@ +#!/bin/sh +# +# Perform a bind mount, copying existing files as we do so to ensure the +# overlaid path has the necessary content. + +if [ $# -lt 2 ]; then + echo >&2 "Usage: $0 spec mountpoint [OPTIONS]" + exit 1 +fi + +spec=$1 +mountpoint=$2 + +if [ $# -gt 2 ]; then + options=$3 +else + options= +fi + +[ -n "$options" ] && options=",$options" + +mkdir -p "${spec%/*}" +if [ -d "$mountpoint" ]; then + if [ ! -d "$spec" ]; then + mkdir "$spec" + cp -pPR "$mountpoint"/. "$spec/" + fi +elif [ -f "$mountpoint" ]; then + if [ ! -f "$spec" ]; then + cp -pP "$mountpoint" "$spec" + fi +fi + +mount -o "bind$options" "$spec" "$mountpoint" diff --git a/meta/recipes-core/volatile-binds/files/volatile-binds.service.in b/meta/recipes-core/volatile-binds/files/volatile-binds.service.in new file mode 100644 index 0000000..32be5b4 --- /dev/null +++ b/meta/recipes-core/volatile-binds/files/volatile-binds.service.in @@ -0,0 +1,19 @@ +[Unit] +Description=Bind mount volatile @where@ +DefaultDependencies=false +Before=local-fs.target +RequiresMountsFor=@whatparent@ @whereparent@ +ConditionPathIsReadWrite=@whatparent@ +ConditionPathExists=@where@ +ConditionPathIsReadWrite=!@where@ + +[Service] +Type=oneshot +RemainAfterExit=Yes +StandardOutput=syslog +TimeoutSec=0 +ExecStart=/sbin/mount-copybind @what@ @where@ +ExecStop=/sbin/umount @where@ + +[Install] +WantedBy=local-fs.target |