feat(nix-compat/{aterm,derivation}): init parser r/6831

This provides a nom-based parser for Nix derivations in ATerm format,
which can be reached via `Derivation::from_aterm_bytes`.

Some of the lower-level ATerm primitives are moved into a (new) aterm
module, and some more higher-level ones that construct derivation-
specific types.

Also, move the escape_bytes function into there, this is a generic ATerm
thing.

Change-Id: I2b03b8a1461c7ea2fcb8640c2fc3d1fa3ea719fb
Reviewed-on: https://cl.tvl.fyi/c/depot/+/9730
Autosubmit: flokli <flokli@flokli.de>
Reviewed-by: raitobezarius <tvl@lahfa.xyz>
Tested-by: BuildkiteCI

1 files changed, 7 insertions, 0 deletions

diff --git a/tvix/nix-compat/src/aterm/mod.rs b/tvix/nix-compat/src/aterm/mod.rs
new file mode 100644
index 000000000000..8806b6caf2e5
--- /dev/null
+++ b/tvix/nix-compat/src/aterm/mod.rs
@@ -0,0 +1,7 @@
+mod escape;
+mod parser;
+
+pub(crate) use escape::escape_bytes;
+pub(crate) use parser::parse_bstr_field;
+pub(crate) use parser::parse_str_list;
+pub(crate) use parser::parse_string_field;