tvix: nix log gives "build log of <package> not available"

#60
Opened by glittershark at 2020-09-01T02·44+00

[grfn@whitby:/depot]$ nix build -f . users.tazjin.nixos.frogSystem
...lots of log output...

[grfn@whitby:/depot]$ nix log -f . users.tazjin.nixos.frogSystem
I20200901 02:43:21.834046 48811 download.cc:104] downloading 'https://cache.nixos.org/nix-cache-info'
I20200901 02:43:30.522158 48811 download.cc:104] downloading 'https://cache.nixos.org/log/zddyz0kavi205rbnjzpyc1xh4jf3d3r1-nixos-system-frog-20.09pre-git.drv'
I20200901 02:43:30.628370 48811 binary-cache-store.cc:278] querying info about '/nix/store/brarxjhqgjmwjr3yizwvka01s3lcfj1g-nixos-system-frog-20.09pre-git' on 'https://cache.nixos.org'
I20200901 02:43:30.628386 48811 download.cc:104] downloading 'https://cache.nixos.org/brarxjhqgjmwjr3yizwvka01s3lcfj1g.narinfo'
E20200901 02:43:30.753585 48811 shared.cc:306] error: build log of 'users.tazjin.nixos.frogSystem' is not available