This change contains 2 improvements to the tvix-store copy command:
1. Allows reading the reference graph from stdin, using `-` argument
2. Supports json representation produced by `nix path-info --json`
command.
In general it makes is easier and faster to import arbitrary closures
from an existing nix store with e.g the following command:
```
nix path-info ./result --json --closure-size --recursive | \
jq -s '{closure: add}' | \
tvix-store copy -
```
Change-Id: Id6eea2993da233ecfbdc186f1a8c37735b686264
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12765
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>
This is another representation about information Nix has on a Store
Path. It's encountered in the exportReferencesGraph feature.
Change-Id: Ia0c08c369f4af9e50ebe3a5053bd98fadaa0003d
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11396
Tested-by: BuildkiteCI
Autosubmit: flokli <flokli@flokli.de>
Reviewed-by: raitobezarius <tvl@lahfa.xyz>
