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462421d345
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).
103 lines
2.3 KiB
C++
103 lines
2.3 KiB
C++
#pragma once
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#include "types.hh"
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#include "hash.hh"
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#include "path.hh"
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#include "tree-info.hh"
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#include "attrs.hh"
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#include "url.hh"
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#include <memory>
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namespace nix { class Store; }
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namespace nix::fetchers {
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struct Input;
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struct Tree
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{
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Path actualPath;
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StorePath storePath;
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TreeInfo info;
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};
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struct Input : std::enable_shared_from_this<Input>
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{
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std::optional<Hash> narHash; // FIXME: implement
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virtual std::string type() const = 0;
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virtual ~Input() { }
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virtual bool operator ==(const Input & other) const { return false; }
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/* Check whether this is a "direct" input, that is, not
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one that goes through a registry. */
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virtual bool isDirect() const { return true; }
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/* Check whether this is an "immutable" input, that is,
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one that contains a commit hash or content hash. */
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virtual bool isImmutable() const { return (bool) narHash; }
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virtual bool contains(const Input & other) const { return false; }
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virtual std::optional<std::string> getRef() const { return {}; }
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virtual std::optional<Hash> getRev() const { return {}; }
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virtual ParsedURL toURL() const = 0;
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std::string to_string() const
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{
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return toURL().to_string();
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}
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Attrs toAttrs() const;
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std::pair<Tree, std::shared_ptr<const Input>> fetchTree(ref<Store> store) const;
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private:
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virtual std::pair<Tree, std::shared_ptr<const Input>> fetchTreeInternal(ref<Store> store) const = 0;
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virtual Attrs toAttrsInternal() const = 0;
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};
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struct InputScheme
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{
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virtual ~InputScheme() { }
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virtual std::unique_ptr<Input> inputFromURL(const ParsedURL & url) = 0;
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virtual std::unique_ptr<Input> inputFromAttrs(const Attrs & attrs) = 0;
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};
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std::unique_ptr<Input> inputFromURL(const ParsedURL & url);
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std::unique_ptr<Input> inputFromURL(const std::string & url);
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std::unique_ptr<Input> inputFromAttrs(const Attrs & attrs);
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void registerInputScheme(std::unique_ptr<InputScheme> && fetcher);
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struct DownloadFileResult
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{
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StorePath storePath;
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std::string etag;
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std::string effectiveUrl;
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};
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DownloadFileResult downloadFile(
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ref<Store> store,
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const std::string & url,
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const std::string & name,
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bool immutable);
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Tree downloadTarball(
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ref<Store> store,
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const std::string & url,
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const std::string & name,
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bool immutable);
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}
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