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initscripts: read-only-rootfs-hook: Use overlay if available

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Copying files from the read-only /var/lib to tmpfs can be slow and waste
memory. If the kernel supports the overlay file system, use it to mount
a writable tmpfs on top of the read-only /var/lib and avoid the file
copy.

(From OE-Core rev: 370fda1b2e8d5dc011522131bba4106de26bfb19)

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Joshua Watt
2018-10-11 13:09:04 -05:00
committed by Richard Purdie
parent 6dd32df4b4
commit 2848e37111
1 changed files with 7 additions and 2 deletions
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meta/recipes-core/initscripts/initscripts-1.0/read-only-rootfs-hook.sh
+7 -2
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@@ -31,8 +31,13 @@ if [ "$1" = "start" ] ; then
if [ `is_on_read_only_partition /var/lib` = "yes" ]; then
grep -q "tmpfs /var/volatile" /proc/mounts || mount /var/volatile
mkdir -p /var/volatile/lib
cp -a /var/lib/* /var/volatile/lib
mount --bind /var/volatile/lib /var/lib
mkdir -p /var/volatile/.lib-work
# Try to mount using overlay, which is much faster than copying
# files. If that fails, fallback to the slower copy
if ! mount -t overlay overlay -olowerdir=/var/lib,upperdir=/var/volatile/lib,workdir=/var/volatile/.lib-work /var/lib > /dev/null 2>&1; then
cp -a /var/lib/* /var/volatile/lib
mount --bind /var/volatile/lib /var/lib
fi
fi
fi