Monorepo for Tangled
nix/microvm: revert erofs to use lz4hc, because the kernel isnt compiled with zstd support :c
Signed-off-by: dawn <dawn@tangled.org>
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nix/microvm/base.nix
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nix/microvm/base.nix
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# a single volume that will back /workspace, /var, and the nix store
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microvm.storeOnDisk = true;
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microvm.storeDiskType = "erofs";
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# zstd 3 is sweet spot here, faster to compress than zstd 1/2, and after 3 the
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# compression speed really falls off for negligible improvement (eg. 9 takes
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# 50s for only 15mb, which is really nothing)
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# lz4hc, not zstd: the stock nixpkgs kernel builds erofs without
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# CONFIG_EROFS_FS_ZIP_ZSTD, so a zstd image fails to mount at boot ("algorithm
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# 3 isn't enabled on this kernel"); only lz4 is guaranteed. -Efragments and
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# -Ededupe are omitted because microvm.nix falls back to single-threaded
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# erofs-utils when either is present, which makes image builds really slow.
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# for now, we take the compression hit, which isn't too much anyway.
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# todo(dawn): figure out a guest kernel build with EROFS_FS_ZIP_ZSTD enabled +
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# also strip down the kernel itself, we need to host our own binary cache also
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# so we / downstream users don't rebuild the kernel every time.
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microvm.storeDiskErofsFlags = [
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"-zzstd,3"
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"-zlz4hc"
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"-Eztailpacking"
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"-Efragments"
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];
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microvm.writableStoreOverlay = "/persist/rw-store";
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microvm.volumes = [