tree aa78b858535224fe8c9b24c2ff7e9ed2c903080b
parent 74e8e5c35fea1ec9ce13c8a2d16100bab45d42d9
author Lorenz Brun <lorenz@nexantic.com> 1611665261 +0100
committer Lorenz Brun <lorenz@nexantic.com> 1611665261 +0100

Add EROFS library

This adds a library to write EROFS filesystems. It supports most of the non-deprecated features the
filesystem supports other than extended inodes (which have no benefits for most use cases where EROFS would be
appropriate). EROFS's variable-length extent compression is partially implemented but it requires an LZ4
compressor with support for fixed-size output which Go's https://github.com/pierrec/lz4 doesn't have. This means
that VLE compression is currently not wired up.

This will be used later as a replacement for our current initramfs-based root filesystem.

Test Plan: Has both integration and some unit tests. Confirmed working for our whole rootfs.

X-Origin-Diff: phab/D692
GitOrigin-RevId: 8c52b45ea05c617c80047e99c04c2b63e1b60c7c