2023-10-30 21:05:53 +00:00
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# erofs compression
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```bash
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#!/bin/bash
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set -x
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# Algorithms are listed in erofs-utils:lib/compressor.c.
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# The best level for each algorithm is listed in erofs-utils:lib/compressor_${alg}.c:.best_level.
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choices=(
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lz4 # doesn't take a level argument (.setlevel is NULL)
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lz4hc,12 # /usr/include/lz4hc.h
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lzma,109 # compressor_liblzma.c
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deflate,9
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libdeflate,12
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)
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time zstd mario.img # creates mario.img.zst
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mkdir mnt
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sudo mount -o loop mario.img mnt
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for choice in "${choices[@]}"; do
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time sudo mkfs.erofs -z"${choice}" mario-"${choice/,/-}.img" mnt
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done
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```
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| 1.6G | mario.img | 1m7s | Non-compressed
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|------+-------------------------+--------|
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| 904M | mario.img.zst | 4s | For comparison
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|------+-------------------------+--------|
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| 1.2G | mario-lz4.img | 53s |
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| 1.1G | mario-lz4hc-12.img | 2m18s |
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| 957M | mario-lzma-109.img | 10m17s |
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| 997M | mario-deflate-9.img | 2m25s |
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| 0 | mario-libdeflate-12.img | - | (compiled without libdeflate support)
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2024-03-07 17:49:23 +00:00
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```
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/home
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/var/lib
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/var/log
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/var/cache
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/etc/ssl/certs/
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/etc/ca-certificates/extracted/
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/etc/letsencrypt/
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/root/
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/usr/lib/utempter/utempter
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/usr/bin/groupmems
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/etc/ssh/ssh_host_*_key{,.pub}
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```
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