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Backport libfetchers from the flakes branch

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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).
This commit is contained in:
Eelco Dolstra 2020-03-30 16:04:18 +02:00
parent ebb20a5356
commit 462421d345
36 changed files with 2199 additions and 647 deletions
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9
src/libstore/globals.hh
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@ -351,12 +351,21 @@ public:
Setting<Paths> pluginFiles{this, {}, "plugin-files",
"Plugins to dynamically load at nix initialization time."};
Setting<std::string> githubAccessToken{this, "", "github-access-token",
"GitHub access token to get access to GitHub data through the GitHub API for github:<..> flakes."};
Setting<Strings> experimentalFeatures{this, {}, "experimental-features",
"Experimental Nix features to enable."};
bool isExperimentalFeatureEnabled(const std::string & name);
void requireExperimentalFeature(const std::string & name);
Setting<bool> allowDirty{this, true, "allow-dirty",
"Whether to allow dirty Git/Mercurial trees."};
Setting<bool> warnDirty{this, true, "warn-dirty",
"Whether to warn about dirty Git/Mercurial trees."};
};