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brackets, e.g.
import <nixpkgs/pkgs/lib>
are resolved by looking them up relative to the elements listed in
the search path. This allows us to get rid of hacks like
import "${builtins.getEnv "NIXPKGS_ALL"}/pkgs/lib"
The search path can be specified through the ‘-I’ command-line flag
and through the colon-separated ‘NIX_PATH’ environment variable,
e.g.,
$ nix-build -I /etc/nixos ...
If a file is not found in the search path, an error message is
lazily thrown.
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if it doesn't exist.
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SQLite manifest cache. The DBI AutoCommit feature caused every
process to have an active transaction at all times, which could
indefinitely block processes wanting to update the manifest cache.
* Disable fsync() in the manifest cache because we don't need
integrity (the cache can always be recreated if it gets corrupted).
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doesn't work when building through the Nix daemon. This also
ensures an error message when the user doesn't have sufficient
privileges to do nix-pull.
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them into memory. This brings memory use down to (more or less)
O(1). For instance, on my test case, the maximum resident size of
download-using-manifests while filling the DB went from 142 MiB to
11 MiB.
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location to DBI and DBD::SQLite can be passed with --with-dbi and
--with-dbd-sqlite.
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modules as well. So use symbolic field names everywhere (which is
nicer anyway).
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This significantly speeds up the download-using-manifests
substituter, especially if manifests are very large. For instance,
one "nix-build -A geeqie" operation that updated four packages using
binary patches went from 18.5s to 1.6s. It also significantly
reduces memory use.
The cache is kept in /nix/var/nix/manifests/cache.sqlite. It's
updated automatically when manifests are added to or removed from
/nix/var/nix/manifests. It might be interesting to have nix-pull
store manifests directly in the DB, rather than storing them as
separate flat files, but then we would need a command line interface
to delete manifests from the DB.
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and redundant anyway.
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This caused a lot of "Use of uninitialized value" warnings from
Perl.
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`+' and `?' in filenames. This is very slow if /nix/store is very
large. (This is a quick hack - a cleaner solution would be to
bypass the shell entirely.)
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failure. The build hook can use this to distinguish between
transient and permanent failures on the remote side.
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of expensive calls to `nix-store --check-validity'.
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* Fix the binary patching test.
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necessary because bsdiff has some pathological worst-case behaviour,
e.g. O(n^2) on files consisting only of 0s.
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`nix-store -q --hash' to get the hash of the base path rather than
`nix-hash'. However, only do this for estimating the size of a
download, not for the actual substitution, because sometimes the
contents of store paths are modified (which they shouldn't, of
course).
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Hopefully this doesn't slow things down too much.
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will approximately require.
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already has it (`nix-store -q --hash').
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on OpenSolaris when using connection sharing. Instead have
the remote side check for disconnection and kill the process
group when that happens.
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set.
* In the build hook, print a trace message to allow Hydra to pick up
the name of the remote machine used for the build.
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hook script proper, and the stdout/stderr of the builder. Only the
latter should be saved in /nix/var/log/nix/drvs.
* Allow the verbosity to be set through an option.
* Added a flag --quiet to lower the verbosity level.
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it requires a certain feature on the build machine, e.g.
requiredSystemFeatures = [ "kvm" ];
We need this in Hydra to make sure that builds that require KVM
support are forwarded to machines that have KVM support. Probably
this should also be enforced for local builds.
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the hook every time we want to ask whether we can run a remote build
(which can be very often), we now reuse a hook process for answering
those queries until it accepts a build. So if there are N
derivations to be built, at most N hooks will be started.
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output as GC roots. This prevents a race if the garbage collector
is running during the build.
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this didn't work right, the build hook wouldn't fall back to using
other machines of the desired type.
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* Work on a manifest instead of a channel directory.
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substituters.
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http://hydra.nixos.org/build/311170).
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nix-prefetch-url should unescape them, because `%' is not a valid
character in store path names.
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processes.
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