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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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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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I.e. if you have a derivation with
src = ./huge-directory;
you'll get a warning that this is not a good idea.
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Fixes #225.
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stream it's now necessary for the daemon to process the entire
sequence of exported paths, rather than letting the client do it.
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(way fewer roundtrips) by allowing the client to send data in bigger
chunks.
* Some refactoring.
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* Buffer the HashSink. This speeds up hashing a bit because it
prevents lots of calls to the hash update functions (e.g. nix-hash
went from 9.3s to 8.7s of user time on the closure of my
/var/run/current-system).
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significantly cuts down the number of syscalls (e.g., for "nix-store
-qR /var/run/current-system" via the daemon, it reduced the number
of syscalls in the client from 29134 to 4766 and in the daemon from
44266 to 20666).
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system calls / context switches when dumping a NAR and in the worker
protocol.
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would just silently store only (fileSize % 2^32) bytes.
* Use posix_fallocate if available when unpacking archives.
* Provide a better error message when trying to unpack something that
isn't a NAR archive.
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* The garbage collector now also prints the number of blocks freed.
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Armijn Hemel.
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via the Unix domain socket in /nix/var/nix/daemon.socket. The
server forks a worker process per connection.
* readString(): use the heap, not the stack.
* Some protocol fixes.
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* Added new operation hasSubstitutes(), which is more efficient than
querySubstitutes().size() > 0.
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* Some refactoring: put the NAR archive integer/string serialisation
code in a separate file so it can be reused by the worker protocol
implementation.
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