From db15e2d01c48786326ee13dd09b7f2dd45f53116 Mon Sep 17 00:00:00 2001 From: Chen Qi Date: Wed, 23 Jul 2014 05:40:12 -0400 Subject: 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 Signed-off-by: Saul Wold Signed-off-by: Richard Purdie --- .../volatile-binds/files/mount-copybind | 34 ++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100755 meta/recipes-core/volatile-binds/files/mount-copybind (limited to 'meta/recipes-core/volatile-binds/files/mount-copybind') 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 0000000000..2aeaf84ddb --- /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" -- cgit v1.2.3-54-g00ecf