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add support for hibernation to swap file

Béla Anton Paulus requested to merge bpalu/mkinitfs:hibernate-to-swap-file into master

Adds support for hibernating to/resuming from a swap file on alpine linux. In order to resume from a swap file, the kernel has to know the offset of the file from the beginning of the partition. This offset should be specified as a parameter on the kernel command line: resume_offset=<offset>. See kernel documentation.

I changed the initramfs-init script to parse the resume_offset parameter and pass the offset to the kernel.

Edited by Béla Anton Paulus

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