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authorChen Qi <Qi.Chen@windriver.com>2014-07-23 09:40:12 (GMT)
committerRichard Purdie <richard.purdie@linuxfoundation.org>2014-08-02 08:26:14 (GMT)
commitdb15e2d01c48786326ee13dd09b7f2dd45f53116 (patch)
tree85aaa9c06c70204977ffd5c8624e9a93f6c98849 /meta/recipes-core/volatile-binds/files/mount-copybind
parent3b19f90bdfca520a6e00057cacb103f8a55feac6 (diff)
downloadpoky-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/mount-copybind')
-rwxr-xr-xmeta/recipes-core/volatile-binds/files/mount-copybind34
1 files changed, 34 insertions, 0 deletions
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 @@
1#!/bin/sh
2#
3# Perform a bind mount, copying existing files as we do so to ensure the
4# overlaid path has the necessary content.
5
6if [ $# -lt 2 ]; then
7 echo >&2 "Usage: $0 spec mountpoint [OPTIONS]"
8 exit 1
9fi
10
11spec=$1
12mountpoint=$2
13
14if [ $# -gt 2 ]; then
15 options=$3
16else
17 options=
18fi
19
20[ -n "$options" ] && options=",$options"
21
22mkdir -p "${spec%/*}"
23if [ -d "$mountpoint" ]; then
24 if [ ! -d "$spec" ]; then
25 mkdir "$spec"
26 cp -pPR "$mountpoint"/. "$spec/"
27 fi
28elif [ -f "$mountpoint" ]; then
29 if [ ! -f "$spec" ]; then
30 cp -pP "$mountpoint" "$spec"
31 fi
32fi
33
34mount -o "bind$options" "$spec" "$mountpoint"