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The function builtins.fetchgit fetches Git repositories at evaluation
time, similar to builtins.fetchTarball. (Perhaps the name should be
changed, being confusing with respect to Nixpkgs's fetchgit function,
with works at build time.)
Example:
(import (builtins.fetchgit git://github.com/NixOS/nixpkgs) {}).hello
or
(import (builtins.fetchgit {
url = git://github.com/NixOS/nixpkgs-channels;
rev = "nixos-16.03";
}) {}).hello
Note that the result does not contain a .git directory.
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This re-implements the binary cache database in C++, allowing it to be
used by other Store backends, in particular the S3 backend.
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This allows readFile() to indicate that a file doesn't exist, and
might eliminate some large string copying.
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For convenience, you can now say
$ nix-env -f channel:nixos-16.03 -iA hello
instead of
$ nix-env -f https://nixos.org/channels/nixos-16.03/nixexprs.tar.xz -iA hello
Similarly,
$ nix-shell -I channel:nixpkgs-unstable -p hello
$ nix-build channel:nixos-15.09 -A hello
Abstracting over the NixOS/Nixpkgs channels location also allows us to
use a more efficient transport (e.g. Git) in the future.
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The 304 Not Modified was not handled correctly, so the empty result
from the conditional request would overwrite the previous tarball.
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Allowing stuff like
NIX_REMOTE=https://cache.nixos.org nix-store -qR /nix/store/x1p1gl3a4kkz5ci0nfbayjqlqmczp1kq-geeqie-1.1
or
NIX_REMOTE=https://cache.nixos.org nix-store --export /nix/store/x1p1gl3a4kkz5ci0nfbayjqlqmczp1kq-geeqie-1.1 | nix-store --import
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Otherwise using curl is not safe in multi-threaded applications
because it installs a SIGALRM handler.
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Calling a class an API is a bit redundant...
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Also, move a few free-standing functions into StoreAPI and Derivation.
Also, introduce a non-nullable smart pointer, ref<T>, which is just a
wrapper around std::shared_ptr ensuring that the pointer is never
null. (For reference-counted values, this is better than passing a
"T&", because the latter doesn't maintain the refcount. Usually, the
caller will have a shared_ptr keeping the value alive, but that's not
always the case, e.g., when passing a reference to a std::thread via
std::bind.)
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This makes it consistent with the Nixpkgs fetchurl and makes it work
in chroots. We don't need verification because the hash of the result
is checked anyway.
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CURLOPT_XFERINFOFUNCTION isn't widely supported yet.
http://hydra.nixos.org/build/26679495
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This ensures that 1) the derivation doesn't change when Nix changes;
2) the derivation closure doesn't contain Nix and its dependencies; 3)
we don't have to rely on ugly chroot hacks.
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