mkosi-initrd: protect old initrd image against errors #3589
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DaanDeMeyer
requested changes
Mar 13, 2025
behrmann
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Mar 13, 2025
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I agree with @DaanDeMeyer on how this should be implemented, but generally I do want to see this feature. I've had the exact thing this is supposed to prevent happen to me with dracut a few times. :)
With this approach we are always invalidating an amount of space equal to the initrd size, but ok, I see your point. |
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When `copy_tree()` ends up calling `cp`, if it fails because there is not enough space, it leaves an incomplete initrd image in the output directory. If we are writing the initrd image directly where a bootloader entry has an initrd configured, the system will fail to boot. So, instead of copying the initrd image directly to the output, copy it next to it in the same output directory, and if the copy is successful, replace it.
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When
copy_tree()ends up callingcp, if it fails because there is not enough space, it leaves and incomplete initrd image in the output directory. If we are writing the initrd image directly where a bootloader entry has an initrd configured, the system will fail to boot. So, backup the old initrd image before callingcopy_tree(), and restore it if that function throws an exception.