lix/src/libfetchers/tree-info.hh
Eelco Dolstra 462421d345 Backport libfetchers from the flakes branch
This provides a pluggable mechanism for defining new fetchers. It adds
a builtin function 'fetchTree' that generalizes existing fetchers like
'fetchGit', 'fetchMercurial' and 'fetchTarball'. 'fetchTree' takes a
set of attributes, e.g.

  fetchTree {
    type = "git";
    url = "https://example.org/repo.git";
    ref = "some-branch";
    rev = "abcdef...";
  }

The existing fetchers are just wrappers around this. Note that the
input attributes to fetchTree are the same as flake input
specifications and flake lock file entries.

All fetchers share a common cache stored in
~/.cache/nix/fetcher-cache-v1.sqlite. This replaces the ad hoc caching
mechanisms in fetchGit and download.cc (e.g. ~/.cache/nix/{tarballs,git-revs*}).

This also adds support for Git worktrees (c169ea5904).
2020-04-07 09:03:14 +02:00

30 lines
529 B
C++

#pragma once
#include "path.hh"
#include "hash.hh"
#include <nlohmann/json_fwd.hpp>
namespace nix { class Store; }
namespace nix::fetchers {
struct TreeInfo
{
Hash narHash;
std::optional<uint64_t> revCount;
std::optional<time_t> lastModified;
bool operator ==(const TreeInfo & other) const
{
return
narHash == other.narHash
&& revCount == other.revCount
&& lastModified == other.lastModified;
}
StorePath computeStorePath(Store & store) const;
};
}