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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>
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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]
(From OE-Core rev: 86ac10995fd08226f82d87e23fda5d4898c3190f)
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.
(From OE-Core rev: 44c7d8a27a84a04251408e9a7d9550629bc17704)
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.
(From OE-Core rev: 5a8ba93efa554c3b4d3b48ca8d668419a8c77f42)
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]
(From OE-Core rev: a9591158962eee1f8ae04168d6256032ecd7bc6b)
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>
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