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go package to chain fs.FS filesystems together (go1.16+)

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Mergefs

A tiny go package which combines together fs.FS filesystems.

mergefs.FS looks through a slice of fs.FS filesytems in order to find a given file. It returns the first match, or os.ErrNotExist.

Go Reference

Related work

mergefs could be used to overlay multiple fs.FS filesystems on top of each other.

  • marshalfs for backing a fileystem with your objects.
  • Standard Library:
    • dirfs contains os.DirFS - this 'default' implementation is backed by an actual filesystem.
    • testfs contains a memory-map implementation and a testing tool. The standard library contains a few other fs.FS implementations (like 'zip')
    • embedfs provides access to files embedded in the running Go program.
  • An earlier work, afero is a filesystem abstraction for Go, which has been the standard for filesystem abstractions up until go1.15. It's read-write, and it's a mature project. The interfaces look very different (big with lots of methods), so it's not really compatible.
  • s3fs is a fs.FS backed by the AWS S3 client
  • hashfs appends SHA256 hashes to filenames to allow for aggressive HTTP caching.

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go package to chain fs.FS filesystems together (go1.16+)

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