[feature request] extract a single file from EROFS filesystem

[Daniel Erez]

Hi,

According to fsck.erofs manual [1], the tool supports extracting the whole
file system.
Would it be applicable to introduce an option for extracting a specific
file from the image?
I.e. something similar to the '-extract-file' option available in
unsquashfs tool [2].
Or, is there any other alternative for extracting a file from an EROFS
image?

[1] https://man.archlinux.org/man/extra/erofs-utils/fsck.erofs.1.en#extract
[2]
https://manpages.debian.org/testing/squashfs-tools/unsquashfs.1.en.html#extract

Thanks!
Daniel
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