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2012-07-06 download-from-binary-cache: parallelise fetching of NAR info filesEelco Dolstra1-76/+128
Getting substitute information using the binary cache substituter has non-trivial latency overhead. A package or NixOS system configuration can have hundreds of dependencies, and in the worst case (when the local info cache is empty) we have to do a separate HTTP request for each of these. If the ping time to the server is t, getting N info files will take tN seconds; e.g., with a ping time of 0.1s to nixos.org, sequentially downloading 1000 info files (a typical NixOS config) will take at least 100 seconds. To fix this problem, the binary cache substituter can now perform requests in parallel. This required changing the substituter interface to support a function querySubstitutablePathInfos() that queries multiple paths at the same time, and rewriting queryMissing() to take advantage of parallelism. (Due to local caching, parallelising queryMissing() is sufficient for most use cases, since it's almost always called before building a derivation and thus fills the local info cache.) For example, parallelism speeds up querying all 1056 paths in a particular NixOS system configuration from 116s to 2.6s. It works so well because the eccentricity of the top-level derivation in the dependency graph is only 9. So we only need 10 round-trips (when using an unlimited number of parallel connections) to get everything. Currently we do a maximum of 150 parallel connections to the server. Thus it's important that the binary cache server (e.g. nixos.org) has a high connection limit. Alternatively we could use HTTP pipelining, but WWW::Curl doesn't support it and libcurl has a hard-coded limit of 5 requests per pipeline.
2012-07-06 download-from-binary-cache: use WWW::CurlEelco Dolstra1-11/+68
Using WWW::Curl rather than running an external curl process for every NAR info file halves the time it takes to get info thanks to libcurl's support for persistent HTTP connections. (We save a roundtrip per file.) But the real gain will come from using parallel and/or pipelined requests.
2012-07-03 download-from-binary-cache: do negative NAR info cachingEelco Dolstra1-5/+29
I.e. if a NAR info file does *not* exist, we record it in the cache DB so that we don't retry it later.
2012-07-03 download-from-binary-cache: in queries, preferred cached infoEelco Dolstra1-20/+28
2012-07-03 download-from-binary-cache: strip trailing / from URLsEelco Dolstra1-1/+1
2012-07-03 download-from-binary-cache: cache binary cache info in a SQLite DBEelco Dolstra1-8/+117
2012-07-02 download-from-binary-cache: Verify NAR hashesEelco Dolstra1-6/+15
2012-07-02 nix-push: Always generate base-32 hashesEelco Dolstra1-2/+2
2012-07-02 Binary caches: use a better keyEelco Dolstra2-8/+13
Use the hash part of the store path as a key rather than a hash of the store path. This is enough to get the desired privacy property.
2012-07-01 Add an environment variable $NIX_BINARY_CACHES specifying URLs of binary cachesEelco Dolstra1-2/+7
2012-07-01 Allow both bzip2 and xz compressionEelco Dolstra2-25/+55
2012-06-29 nix-push: Don't pollute the current directory with result symlinkEelco Dolstra1-1/+1
2012-06-29 First attempt at the manifest-less substituterEelco Dolstra2-5/+121
2012-06-29 DohEelco Dolstra1-1/+1
2012-06-29 Use XZ compression in binary cachesEelco Dolstra1-13/+13
XZ compresses significantly better than bzip2. Here are the compression ratios and execution times (using 4 cores in parallel) on my /var/run/current-system (3.1 GiB): bzip2: total compressed size 849.56 MiB, 30.8% [2m08] xz -6: total compressed size 641.84 MiB, 23.4% [6m53] xz -7: total compressed size 621.82 MiB, 22.6% [7m19] xz -8: total compressed size 599.33 MiB, 21.8% [7m18] xz -9: total compressed size 588.18 MiB, 21.4% [7m40] Note that compression takes much longer. More importantly, however, decompression is much faster: bzip2: 1m47.274s xz -6: 0m55.446s xz -7: 0m54.119s xz -8: 0m52.388s xz -9: 0m51.842s The only downside to using -9 is that decompression takes a fair amount (~65 MB) of memory.
2012-06-28 nix-push: create a manifest-less binary cacheEelco Dolstra1-159/+93
Manifests are a huge pain, since users need to run nix-pull directly or indirectly to obtain them. They tend to be large and lag behind the available binaries; also, the downloaded manifests in /nix/var/nix/manifest need to be in sync with the Nixpkgs sources. So we want to get rid of them. The idea of manifest-free operation works as follows. Nix is configured with a set of URIs of binary caches, e.g. http://nixos.org/binary-cache Whenever Nix needs a store path X, it checks each binary cache for the existence of a file <CACHE-URI>/<SHA-256 hash of X>.narinfo, e.g. http://nixos.org/binary-cache/bi1gh9...ia17.narinfo The .narinfo file contains the necessary information about the store path that was formerly kept in the manifest, i.e., (relative) URI of the compressed NAR, references, size, hash, etc. For example: StorePath: /nix/store/xqp4l88cr9bxv01jinkz861mnc9p7qfi-neon-0.29.6 URL: 1bjxbg52l32wj8ww47sw9f4qz0r8n5vs71l93lcbgk2506v3cpfd.nar.bz2 CompressedHash: sha256:1bjxbg52l32wj8ww47sw9f4qz0r8n5vs71l93lcbgk2506v3cpfd CompressedSize: 202542 NarHash: sha256:1af26536781e6134ab84201b33408759fc59b36cc5530f57c0663f67b588e15f NarSize: 700440 References: 043zrsanirjh8nbc5vqpjn93hhrf107f-bash-4.2-p24 cj7a81wsm1ijwwpkks3725661h3263p5-glibc-2.13 ... Deriver: 4idz1bgi58h3pazxr3akrw4fsr6zrf3r-neon-0.29.6.drv System: x86_64-linux Nix then knows that it needs to download http://nixos.org/binary-cache/1bjxbg52l32wj8ww47sw9f4qz0r8n5vs71l93lcbgk2506v3cpfd.nar.bz2 to substitute the store path. Note that the store directory is omitted from the References and Deriver fields to save space, and that the URL can be relative to the binary cache prefix. This patch just makes nix-push create binary caches in this format. The next step is to make a substituter that supports them.
2012-05-31 Update nix profile: - incorporate NixOS's configuration so that nix is ↵Michel Alexandre Salim2-8/+47
usable by normal users - install as a data file, not a program file
2012-05-22 Generate binary tarballs for installing NixEelco Dolstra1-0/+34
For several platforms we don't currently have "native" Nix packages (e.g. Mac OS X and FreeBSD). This provides the next best thing: a tarball containing the closure of Nix, plus a simple script "nix-finish-install" that initialises the Nix database, registers the paths in the closure as valid, and runs "nix-env -i /path/to/nix" to initialise the user profile. The tarball must be unpacked in the root directory. It creates /nix/store/... and /usr/bin/nix-finish-install. Typical installation is as follows: $ cd / $ tar xvf /path/to/nix-1.1pre1234_abcdef-x86_64-linux.tar.bz2 $ nix-finish-install (if necessary add ~/.nix-profile/etc/profile.d/nix.sh to the shell login scripts) After this, /usr/bin/nix-finish-install can be deleted, if desired. The downside to the binary tarball is that it's pretty big (~55 MiB for x86_64-linux).
2012-05-22 Remove $FONTCONFIG_FILE hack from nix-profile.shEelco Dolstra1-7/+0
It's no longer needed because Nixpkgs' fontconfig uses /etc/fonts/fonts.conf as a default, just like other distributions.
2012-05-08 Remove obsolete files (moved to release tree)Eelco Dolstra4-157/+0
2012-05-07 nix-channel --update: allow updating only the specified channelsEelco Dolstra1-3/+6
2012-05-07 Now *really* prevent accumulation of old manifestsEelco Dolstra1-2/+4
2012-05-01 Use mkpath instead of make_pathEelco Dolstra1-2/+2
Perl <= 5.10 doesn't have make_path. See e.g. http://hydra.nixos.org/build/2493981.
2012-04-30 Support mandatory system features in the build hookEelco Dolstra1-4/+8
Mandatory features are features that MUST be present in a derivation's requiredSystemFeatures attribute. One application is performance testing, where we have a dedicated machine to run performance tests (and nothing else). Then we would add the label "perf" to the machine's mandatory features and to the performance testing derivations.
2012-04-24 Fix a warning in the build hook about $progressViewerEelco Dolstra1-1/+1
2012-04-18 Fix URL set by nix-channelEelco Dolstra1-1/+1
2012-04-16 Hack to prevent accumulation of old manifestsEelco Dolstra2-1/+3
2012-04-14 If the (redirected) channel URL contains a version number, use itEelco Dolstra1-1/+7
2012-04-14 Follow redirects early to ensure consistency between the manifest and the ↵Eelco Dolstra1-0/+8
tarball Without this change, if the URL is a redirect that changes in between, we can get a manifest that doesn't match the tarball.
2012-04-14 Remove unnecessary "system" argumentEelco Dolstra1-1/+1
2012-04-14 nix-channel improvementsEelco Dolstra1-69/+60
"nix-channel --add" now accepts a second argument: the channel name. This allows channels to have a nicer name than (say) nixpkgs_unstable. If no name is given, it defaults to the last component of the URL (with "-unstable" or "-stable" removed). Also, channels are now stored in a profile (/nix/var/nix/profiles/per-user/$USER/channels). One advantage of this is that it allows rollbacks (e.g. if "nix-channel --update" gives an undesirable update).
2012-04-13 If "pv" is available at compile time, hard-code its pathEelco Dolstra1-1/+1
2012-04-13 nix-copy-closure: Move the progressViewer directly adjacent to the ssh call ↵Shea Levy1-1/+1
so that network progress is what's measured
2012-04-13 Add the '--show-progress' flag to nix-copy-closureShea Levy1-2/+8
2012-04-10 Handle the case where $SHELL is not setEelco Dolstra1-1/+2
2012-04-04 nix-generate-patches: Optionally write new patches to $NIX_ALL_PATCHESHydra mirror1-0/+10
2012-04-04 Follow redirects when checking for the existence of MANIFEST.bz2Eelco Dolstra1-1/+1
If we don't follow redirects, we might think that MANIFEST.bz2 exists just because the HEAD request succeeds on the redirector URI.
2012-03-27 Update "nix-build --help"Eelco Dolstra1-1/+6
2012-03-27 Add an option "--exclude" to filter dependencies in "nix-build --run-env"Eelco Dolstra1-1/+9
Sometimes when doing "nix-build --run-env" you don't want all dependencies to be built. For instance, if we want to do "--run-env" on the "build" attribute in Hydra's release.nix (to get Hydra's build environment), we don't want its "tarball" dependency to be built. So we can do: $ nix-build --run-env release.nix -A build --exclude 'hydra-tarball' This will skip the dependency whose name matches the "hydra-tarball" regular expression. The "--exclude" option can be repeated any number of times.
2012-03-27 Allow the command executed by "nix-build --run-env" to be overriden with ↵Eelco Dolstra1-1/+9
--command
2012-03-19 Add a command "nix-build --run-env" to reproduce the environment of a derivationEelco Dolstra1-0/+29
This command builds or fetches all dependencies of the given derivation, then starts a shell with the environment variables from the derivation. This shell also sources $stdenv/setup to initialise the environment further. The current directory is not changed. Thus this is a convenient way to reproduce a build environment in an existing working tree. Existing environment variables are left untouched (unless the derivation overrides them). As a special hack, the original value of $PATH is appended to the $PATH produced by $stdenv/setup. Example session: $ nix-build --run-env '<nixpkgs>' -A xterm (the dependencies of xterm are built/fetched...) $ tar xf $src $ ./configure $ make $ emacs (... hack source ...) $ make $ ./xterm
2012-03-05 nix-copy-closure: don't print copied path on stdoutEelco Dolstra1-1/+1
We're already printing progress on stderr, so printing them on stdout afterwards is kind of useless.
2012-03-05 Restore progress indication during nix-copy-closureEelco Dolstra1-1/+0
2012-03-05 build-remote.pl: don't wait forever for the upload lockEelco Dolstra1-3/+17
In the build hook, don't wait forever to get the upload lock. This ensures progress if another process gets stuck while holding the upload lock.
2012-02-02 * nix-channel: fail if we don't have write permission to the manifestsEelco Dolstra1-13/+7
directory. Previously in this situation we did add the Nix expressions from the channel to allow installation from source, but this doesn't work for binary-only channels and leads to confusing error messages.
2012-01-13 * nix-build: put the temporary derivation symlink in a temporaryEelco Dolstra1-28/+9
directory rather than the current directory. * nix-build: --drv-link now implies --add-drv-link.
2012-01-05 * Doh!Eelco Dolstra1-1/+1
2012-01-05 * Add a -I flag to the Perl bindings to nix-build and some otherEelco Dolstra5-5/+5
scripts. * Include the version and architecture in the -I flag so that there is at least a chance that a Nix binary built for one Perl version will run on another version.
2012-01-03 * Add a test for nix-channel.Eelco Dolstra1-12/+10
* Refactor the nix-channel unpacker a bit.
2012-01-03 * Use Nix::Config.Eelco Dolstra4-22/+15
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