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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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2
tests/init.sh
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@ -17,7 +17,7 @@ cat > "$NIX_CONF_DIR"/nix.conf <<EOF
build-users-group =
keep-derivations = false
sandbox = false
experimental-features = nix-command
experimental-features = nix-command flakes
include nix.conf.extra
EOF