[23.0 backport] daemon: overlay2: Write layer metadata atomically #46704
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When the daemon process or the host running it is abruptly terminated, the layer metadata file can become inconsistent on the file system. Specifically, `link` and `lower` files may exist but be empty, leading to overlay mounting errors during layer extraction, such as: "failed to register layer: error creating overlay mount to <path>: too many levels of symbolic links." This commit introduces the use of `AtomicWriteFile` to ensure that the layer metadata files contain correct data when they exist on the file system. Signed-off-by: Mike <mike.sul@foundries.io> (cherry picked from commit de2447c) Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
corhere
approved these changes
Oct 23, 2023
vvoland
approved these changes
Oct 24, 2023
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When the daemon process or the host running it is abruptly terminated, the layer metadata file can become inconsistent on the file system. Specifically,
linkandlowerfiles may exist but be empty, leading to overlay mounting errors during layer extraction, such as: "failed to register layer: error creating overlay mount to : too many levels of symbolic links."This commit introduces the use of
AtomicWriteFileto ensure that the layer metadata files contain correct data when they exist on the file system.(cherry picked from commit de2447c)
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