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feat(tvix/castore/fs): support extended attributes

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This exposes `user.tvix.castore.{blob,directory}.digest` xattr keys for
files and directories:

```
❯ getfattr -d /tmp/tvix/06jrrv6wwp0nc1m7fr5bgdw012rfzfx2-nano-7.2-info
getfattr: Removing leading '/' from absolute path names
user.tvix.castore.directory.digest="b3:SuYDcUM9RpWcnA40tYB1BtYpR0xw72v3ymhKDQbBfe4="

❯ getfattr -d /tmp/tvix/156a89x10c3kaby9rgf3fi4k0p6r9wl1-etc-shells
getfattr: Removing leading '/' from absolute path names
user.tvix.castore.blob.digest="b3:pZkwZoHN+/VQ8wkaX0wYVXZ0tV/HhtKlSqiaWDK7uRs="
```

It's currently mostly used for debugging, though it might be useful for
tvix-castore-aware syncing programs using the filesystem too.

Change-Id: I26ac3cb9fe51ffbf7f880519f26741549cb5ab6a
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11422
Autosubmit: flokli <flokli@flokli.de>
Reviewed-by: raitobezarius <tvl@lahfa.xyz>
Tested-by: BuildkiteCI
Reviewed-by: Brian Olsen <me@griff.name>
This commit is contained in:
Florian Klink 2024-04-14 18:01:24 +03:00 • committed by flokli
parent 23871649bb
commit 515bfa18fb
7 changed files with 227 additions and 5 deletions
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4
tvix/Cargo.nix
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@ -13953,6 +13953,10 @@ rec {
name = "tokio-retry";
packageId = "tokio-retry";
}
{
name = "xattr";
packageId = "xattr";
}
];
features = {
"cloud" = [ "dep:bigtable_rs" "object_store/aws" "object_store/azure" "object_store/gcp" ];