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This is primary to allow hydra-queue-runner to extract files like
"nix-support/hydra-build-products" from NARs in binary caches.
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Also makes it robust against concurrent deletions.
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So now you can do
$ NIX_REMOTE=file:///tmp/binary-cache nix-instantiate '<nixpkgs>' -A hello
and lots of other operations.
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So you can now do:
$ NIX_REMOTE=file:///tmp/binary-cache nix-store -qR /nix/store/...
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The latter is supposed to be more efficient.
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This is necessary for long-running processes like hydra-queue-runner:
if a nix-daemon worker is killed, we need to stop reusing that
connection.
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This allows a RemoteStore object to be used safely from multiple
threads concurrently. It will make multiple daemon connections if
necessary.
Note: pool.hh and sync.hh have been copied from the Hydra source tree.
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This is used by the Hydra queue runner, but since it may also be
useful for the C++ rewrite of nix-push, I'm putting it here.
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Otherwise we might leak memory.
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Implement floats
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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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POSIX compliant directory access (fixes build on Solaris)
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`BUFSIZ` is defined in header `<cstdio>`.
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Also, use "#if __APPLE__" instead of "#if SANDBOX_ENABLED" to prevent
ambiguity.
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edolstra:
“…since callers of readDirectory have to handle the possibility of
DT_UNKNOWN anyway, and we don't want to do a stat call for every
directory entry unless it's really needed.”
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d_type is not part of the POSIX spec unfortunately.
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Fixes #679.
Note: on x86_64, SHA-512 is considerably faster than SHA-256 (198 MB/s
versus 131 MB/s).
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* If the path ends with a slash, drop it.
* If the remaining path doesn’t contain slashes, just return it.
Fixes #574.
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This is mostly useful for hydra-queue-runner.
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Previously, to build a derivation remotely, we had to copy the entire
closure of the .drv file to the remote machine, even though we only
need the top-level derivation. This is very wasteful: the closure can
contain thousands of store paths, and in some Hydra use cases, include
source paths that are very large (e.g. Git/Mercurial checkouts).
So now there is a new operation, StoreAPI::buildDerivation(), that
performs a build from an in-memory representation of a derivation
(BasicDerivation) rather than from a on-disk .drv file. The only files
that need to be in the Nix store are the sources of the derivation
(drv.inputSrcs), and the needed output paths of the dependencies (as
described by drv.inputDrvs). "nix-store --serve" exposes this
interface.
Note that this is a privileged operation, because you can construct a
derivation that builds any store path whatsoever. Fixing this will
require changing the hashing scheme (i.e., the output paths should be
computed from the other fields in BasicDerivation, allowing them to be
verified without access to other derivations). However, this would be
quite nice because it would allow .drv-free building (e.g. "nix-env
-i" wouldn't have to write any .drv files to disk).
Fixes #173.
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This didn't work (despite claims in the manual), because the colon in
"http://" was parsed as a element separator. So handle "://"
specially.
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ETags are used to prevent redownloading unchanged files.
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