refactor(tvix/eval): rewrite xml emitter to be simple-stupid r/8160

In order to be compatible with the nix XML generator, it’s easier to
generate the XML directly, instead of going through a library which we
have to bend to do what we need.

Removes dependency on `xml-rs`, which came with a full XML parser that
we didn’t use. Only takes a tiny bit of code for the XML escaping,
somewhat simplified.

I add a little escaping value, to make sure we have the same behaviour
as nix proper.

Interestingly enough, we never need to escape XML attribute names,
because the `builtins.toXML` format encodes user-defined values as
attribute keys only. So we only escape attribute values.

Fixes: https://b.tvl.fyi/issues/399
Change-Id: If4d407d324864b3bb9aa3160e2ec6889f7727127
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11697
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>
Autosubmit: Profpatsch <mail@profpatsch.de>

1 files changed, 0 insertions, 1 deletions

diff --git a/tvix/eval/Cargo.toml b/tvix/eval/Cargo.toml
index 677ce6ab85be..cc590791cc92 100644
--- a/tvix/eval/Cargo.toml
+++ b/tvix/eval/Cargo.toml
@@ -30,7 +30,6 @@ smol_str = "0.2.0"
 tabwriter = "1.2"
 test-strategy = { version = "0.2.1", optional = true }
 toml = "0.6.0"
-xml-rs = "0.8.4"
 sha2 = "0.10.8"
 sha1 = "0.10.6"
 md-5 = "0.10.6"