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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.
Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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It's possible that /var/lib is on a separate writable partition. In such
situation, we should not bind mount /var/lib with tmpfs, becasue it's
already writable.
This patch fixes this problem by checking whether /var/lib is already
on a writable partition.
[YOCTO #4888]
Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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Mount /var/volatile ourselves so that we can set up the writable area
first. This fixes the urandom service not starting properly when
read-only-rootfs is enabled.
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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Unionfs isn't available everywhere, and we can get similar results (if
not quite as neatly) by using bind mounts + tmpfs and copying the data
over.
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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Add read-only-rootfs-hook.sh script to support a read-only rootfs.
This script makes a union mount of /var/lib and /var/volatile/lib,
making /var/lib directory writable.
[YOCTO #3406]
Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
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Joshua Watt
Chen Qi
Paul Eggleton