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(Linux) machines no longer maintain the atime because it's too
expensive, and on the machines where --use-atime is useful (like the
buildfarm), reading the atimes on the entire Nix store takes way too
much time to make it practical.
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apparently).
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allocate memory, which is verboten in signal handlers. This caused
random failures in the test suite on Mac OS X (triggered by the spurious
SIGPOLL signals on Mac OS X, which should also be fixed).
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the client to a temporary directory, as that is highly inefficient.
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SHA-256 outputs of fixed-output derivations. I.e. they now produce
the same store path:
$ nix-store --add x
/nix/store/j2fq9qxvvxgqymvpszhs773ncci45xsj-x
$ nix-store --add-fixed --recursive sha256 x
/nix/store/j2fq9qxvvxgqymvpszhs773ncci45xsj-x
the latter being the same as the path that a derivation
derivation {
name = "x";
outputHashAlgo = "sha256";
outputHashMode = "recursive";
outputHash = "...";
...
};
produces.
This does change the output path for such fixed-output derivations.
Fortunately they are quite rare. The most common use is fetchsvn
calls with SHA-256 hashes. (There are a handful of those is
Nixpkgs, mostly unstable development packages.)
* Documented the computation of store paths (in store-api.cc).
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zombie at a time, so if multiple children died before the handler
got to run, some of them would not be cleaned up.
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build progress.
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* --dry-run: print the paths that we don't know how to build/substitute.
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* The garbage collector now also prints the number of blocks freed.
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in /nix/var/nix/temproots.
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https://svn.nixos.org/repos/nix/nix/branches/no-bdb).
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This isn't usually a problem, except that it causes tests to fail
when performed in a directory with a very long path name. So chdir
to the socket directory and use a relative path name.
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builds (which are done as root...).
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* queryDeriver in daemon mode: don't barf if the other side returns an
empty string (which means there is no deriver).
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in multi-user Nix (NIX-72).
* Client/worker: exchange a protocol version number for future
compatibility.
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(/nix/var/nix/daemon-socket). This allows access to the Nix daemon
to be restricted by setting the mode/ownership on that directory as
desired, e.g.
$ chmod 770 /nix/var/nix/daemon-socket
$ chown root.wheel /nix/var/nix/daemon-socket
to allow only users in the wheel group to use Nix.
Setting the ownership on a socket is much trickier, since the socket
must be deleted and recreated every time the daemon is started
(which would require additional Nix configuration file directives to
specify the mode/ownership, and wouldn't support arbitrary ACLs),
some BSD variants appear to ignore permissions on sockets, and it's
not clear whether the umask is respected on every platform when
creating sockets.
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unexpected conditions in the SIGPOLL handler, since that messes up
the Berkeley DB environment (which a client must never be able to
trigger).
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always requires a signature on the archive. This is to ensure that
unprivileged users cannot add Trojan horses to the Nix store.
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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.
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