Commit graph

48 commits

Author SHA1 Message Date
Guillaume Bouchard
7afcb5af98 Remove the drain argument from readFile
Now it is always `drain` (see previous commit).
2020-04-29 18:43:45 +02:00
Eelco Dolstra
8918bae098 Drop remaining uses of external "tar"
Also, fetchGit now runs in O(1) memory since we pipe the output of
'git archive' directly into unpackTarball() (rather than first reading
it all into memory).
2019-11-26 22:07:28 +01:00
John Ericson
96e6e680c1 Fix extra ; warnings involving MakeError 2019-11-10 11:24:47 -05:00
Eelco Dolstra
0abb3ad537 Allow content-addressable paths to have references
This adds a command 'nix make-content-addressable' that rewrites the
specified store paths into content-addressable paths. The advantage of
such paths is that 1) they can be imported without signatures; 2) they
can enable deduplication in cases where derivation changes do not
cause output changes (apart from store path hashes).

For example,

  $ nix make-content-addressable -r nixpkgs.cowsay
  rewrote '/nix/store/g1g31ah55xdia1jdqabv1imf6mcw0nb1-glibc-2.25-49' to '/nix/store/48jfj7bg78a8n4f2nhg269rgw1936vj4-glibc-2.25-49'
  ...
  rewrote '/nix/store/qbi6rzpk0bxjw8lw6azn2mc7ynnn455q-cowsay-3.03+dfsg1-16' to '/nix/store/iq6g2x4q62xp7y7493bibx0qn5w7xz67-cowsay-3.03+dfsg1-16'

We can then copy the resulting closure to another store without
signatures:

  $ nix copy --trusted-public-keys '' ---to ~/my-nix /nix/store/iq6g2x4q62xp7y7493bibx0qn5w7xz67-cowsay-3.03+dfsg1-16

In order to support self-references in content-addressable paths,
these paths are hashed "modulo" self-references, meaning that
self-references are zeroed out during hashing. Somewhat annoyingly,
this means that the NAR hash stored in the Nix database is no longer
necessarily equal to the output of "nix hash-path"; for
content-addressable paths, you need to pass the --modulo flag:

  $ nix path-info --json /nix/store/iq6g2x4q62xp7y7493bibx0qn5w7xz67-cowsay-3.03+dfsg1-16  | jq -r .[].narHash
  sha256:0ri611gdilz2c9rsibqhsipbfs9vwcqvs811a52i2bnkhv7w9mgw

  $ nix hash-path --type sha256 --base32 /nix/store/iq6g2x4q62xp7y7493bibx0qn5w7xz67-cowsay-3.03+dfsg1-16
  1ggznh07khq0hz6id09pqws3a8q9pn03ya3c03nwck1kwq8rclzs

  $ nix hash-path --type sha256 --base32 /nix/store/iq6g2x4q62xp7y7493bibx0qn5w7xz67-cowsay-3.03+dfsg1-16 --modulo iq6g2x4q62xp7y7493bibx0qn5w7xz67
  0ri611gdilz2c9rsibqhsipbfs9vwcqvs811a52i2bnkhv7w9mgw
2019-10-21 17:47:24 +02:00
zimbatm
91b00b145f
libutil: add SizedSource
Introduce the SizeSource which allows to bound how much data is being
read from a source. It also contains a drainAll() function to discard
the rest of the source, useful to keep the nix protocol in sync.
2019-08-16 15:05:40 +02:00
Eelco Dolstra
44e86304b6
Make NAR header check more robust
Changes

  std::bad_alloc

into

  bad archive: input doesn't look like a Nix archive
2018-09-26 12:03:58 +02:00
Eelco Dolstra
ebe3d2d370 Improve 'coroutine has finished' error message 2018-08-21 15:22:04 +02:00
Will Dietz
b08923b4a0 serialise: fix buffer size used, hide method for internal use only
Fixes #2169.
2018-05-21 17:30:38 -05:00
Eelco Dolstra
53ec5ac69f
Fix some random -Wconversion warnings 2018-05-02 13:56:34 +02:00
Eelco Dolstra
48662d151b
Reduce substitution memory consumption
copyStorePath() now pipes the output of srcStore->narFromPath()
directly into dstStore->addToStore(). The sink used by the former is
converted into a source usable by the latter using
boost::coroutine2. This is based on [1].

This reduces the maximum resident size of

  $ nix build --store ~/my-nix/ /nix/store/b0zlxla7dmy1iwc3g459rjznx59797xy-binutils-2.28.1 --substituters file:///tmp/binary-cache-xz/ --no-require-sigs

from 418592 KiB to 53416 KiB. (The previous commit also reduced the
runtime from ~4.2s to ~3.4s, not sure why.) A further improvement will
be to download files into a Sink.

[1] https://github.com/NixOS/nix/compare/master...Mathnerd314:dump-fix-coroutine#diff-dcbcac55a634031f9cc73707da6e4b18

Issue #1969.
2018-03-16 20:35:59 +01:00
Eelco Dolstra
3e6b194d78
decompress(): Use a Source and Sink
This allows decompression to happen in O(1) memory.
2018-03-16 20:35:59 +01:00
Eelco Dolstra
37fbfffd8e
Pass all settings to build-remote
This ensures that command line flags such as --builders get passed
correctly.
2017-10-23 20:50:28 +02:00
Jörg Thalheim
2fd8f8bb99 Replace Unicode quotes in user-facing strings by ASCII
Relevant RFC: NixOS/rfcs#4

$ ag -l | xargs sed -i -e "/\"/s/’/'/g;/\"/s/‘/'/g"
2017-07-30 12:32:45 +01:00
Eelco Dolstra
f61f67ddee
RemoteStore::addToStore(): Send NAR rather than string containing NAR
This allows the NAR to be streamed in the future (though we're not
doing that yet).
2017-03-01 16:07:15 +01:00
Eelco Dolstra
c4a40949d9
Handle importing NARs containing files greater than 4 GiB
Also templatize readInt() to work for various integer types.
2017-03-01 13:52:54 +01:00
Eelco Dolstra
ddb5577f2e
Move SavingSourceAdapter to serialise.hh 2017-02-07 19:29:20 +01:00
Eelco Dolstra
215b70f51e
Revert "Get rid of unicode quotes (#1140)"
This reverts commit f78126bfd6. There
really is no need for such a massive change...
2016-11-26 00:38:01 +01:00
Guillaume Maudoux
f78126bfd6 Get rid of unicode quotes (#1140) 2016-11-25 15:48:27 +01:00
Shea Levy
06068b353d FdSink: Restore move constructor/assignment 2016-07-13 06:27:41 -04:00
Shea Levy
b33e85229d Make Buffered{Source,Sink} move-safe 2016-07-13 06:03:37 -04:00
Eelco Dolstra
0d4a10e910 Do compression in a sink 2016-05-04 16:16:53 +02:00
Eelco Dolstra
42bc395b63 Eliminate some large string copying 2016-03-04 16:49:56 +01:00
Eelco Dolstra
581e1bc5b4 FdSource: track number of bytes read 2016-02-26 16:16:08 +01:00
Eelco Dolstra
5f862658c3 Remove bad daemon connections from the pool
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.
2016-02-24 11:39:56 +01:00
Eelco Dolstra
71a5161365 Implement buildDerivation() via the daemon 2015-09-03 12:56:59 +02:00
Eelco Dolstra
b3491c781c More cleanup 2015-07-20 01:16:16 +02:00
Eelco Dolstra
1511aa9f48 Allow remote builds without sending the derivation closure
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.
2015-07-17 17:57:40 +02:00
Eelco Dolstra
9d0709e8c4 Don't use member initialisers
They're a little bit too recent (only supported since GCC 4.7).

http://hydra.nixos.org/build/11851475
2014-06-12 17:30:37 +02:00
Eelco Dolstra
48495f67ed Fix bogus warnings about dumping large paths
Also, yay for C++11 non-static initialisers.
2014-06-12 13:15:35 +02:00
Eelco Dolstra
829af22759 Print a warning when loading a large path into memory
I.e. if you have a derivation with

  src = ./huge-directory;

you'll get a warning that this is not a good idea.
2014-06-10 13:30:09 +02:00
Ivan Kozik
34bb806f74 Fix typos, especially those that end up in the Nix manual 2013-08-26 11:15:22 +02:00
Eelco Dolstra
5959c591a0 Process stderr from substituters while doing have/info queries 2013-06-07 15:02:14 +02:00
Eelco Dolstra
b7fd2c2822 Use "#pragma once" to prevent repeated header file inclusion 2012-07-18 14:59:03 -04:00
Eelco Dolstra
273b288a7e * importPath() -> importPaths(). Because of buffering of the input
stream it's now necessary for the daemon to process the entire
  sequence of exported paths, rather than letting the client do it.
2011-12-16 22:31:25 +00:00
Eelco Dolstra
8d3dfa2c17 * Avoid expensive conversions from char arrays to STL strings. 2011-12-16 21:29:46 +00:00
Eelco Dolstra
e0bd307802 * Make the import operation through the daemon much more efficient
(way fewer roundtrips) by allowing the client to send data in bigger
  chunks.
* Some refactoring.
2011-12-16 19:44:13 +00:00
Eelco Dolstra
78598d06f0 * Clean up exception handling. 2011-12-16 15:45:42 +00:00
Eelco Dolstra
5a1b9ed0aa * Refactoring: move sink/source buffering into separate classes.
* 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).
2011-12-15 16:19:53 +00:00
Eelco Dolstra
a3e0656cbb * Buffer reads in FdSource. Together with write buffering, this
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).
2011-12-15 12:32:08 +00:00
Eelco Dolstra
3a48282b06 * Buffer writes in FdSink. This significantly reduces the number of
system calls / context switches when dumping a NAR and in the worker
  protocol.
2011-12-14 23:30:06 +00:00
Eelco Dolstra
77d272623f * NAR archives: handle files larger than 2^32 bytes. Previously it
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.
2009-03-22 17:36:43 +00:00
Eelco Dolstra
07cdfb09fb * Open the connection to the daemon lazily (on demand) so that
read-only operations (like nix-env -qa) work properly when the
  daemon isn't running.
2008-12-11 14:30:25 +00:00
Eelco Dolstra
5eaf644c99 * A simple API for parsing NAR archives. 2008-12-03 17:30:32 +00:00
Eelco Dolstra
a72709afd8 * Some refactoring: put the GC options / results in separate structs.
* The garbage collector now also prints the number of blocks freed.
2008-06-18 09:34:17 +00:00
Eelco Dolstra
a3e6415ba8 * New primop builtins.filterSource, which can be used to filter files
from a source directory.  All files for which a predicate function
  returns true are copied to the store.  Typical example is to leave
  out the .svn directory:

    stdenv.mkDerivation {
      ...
      src = builtins.filterSource
        (path: baseNameOf (toString path) != ".svn")
        ./source-dir;
      # as opposed to
      #   src = ./source-dir;
    }

  This is important because the .svn directory influences the hash in
  a rather unpredictable and variable way.
2006-12-12 23:05:01 +00:00
Eelco Dolstra
0565b5f2b3 * More remote operations.
* Added new operation hasSubstitutes(), which is more efficient than
  querySubstitutes().size() > 0.
2006-11-30 22:43:55 +00:00
Eelco Dolstra
765bdfe542 * When NIX_REMOTE is set to "slave", fork off nix-worker in slave
mode.  Presumably nix-worker would be setuid to the Nix store user.
  The worker performs all operations on the Nix store and database, so
  the caller can be completely unprivileged.

  This is already much more secure than the old setuid scheme, since
  the worker doesn't need to do Nix expression evaluation and so on.
  Most importantly, this means that it doesn't need to access any user
  files, with all resulting security risks; it only performs pure
  store operations.

  Once this works, it is easy to move to a daemon model that forks off
  a worker for connections established through a Unix domain socket.
  That would be even more secure.
2006-11-30 19:54:43 +00:00
Eelco Dolstra
40b3f64b55 * Skeleton of the privileged worker program.
* Some refactoring: put the NAR archive integer/string serialisation
  code in a separate file so it can be reused by the worker protocol
  implementation.
2006-11-30 19:19:59 +00:00