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2012-07-30Pass configuration settings to the substitutersEelco Dolstra
Previously substituters could read nix.conf themselves, but this didn't take --option flags into account.
2012-07-30Remove unused variablesEelco Dolstra
2012-07-30Fix whitespaceEelco Dolstra
2012-07-27Let build.cc verify the expected hash of a substituter's outputEelco Dolstra
Since SubstitutionGoal::finished() in build.cc computes the hash anyway, we can prevent the inefficiency of computing the hash twice by letting the substituter tell Nix about the expected hash, which can then verify it.
2012-07-27Remove more tabsEelco Dolstra
2012-07-27Remove trailing whitespace / tabsEelco Dolstra
2012-07-26Fix the substituter testsEelco Dolstra
2012-07-26Merge branch 'master' into no-manifestsEelco Dolstra
2012-07-26Set permissions on temporary build directories to 0700Eelco Dolstra
Fixes #39.
2012-07-23Handle platforms that don't support linking to a symlinkEelco Dolstra
E.g. Darwin doesn't allow this.
2012-07-23Unlink the right fileEelco Dolstra
2012-07-23Garbage collect unused links in /nix/store/.linksEelco Dolstra
Incremental optimisation requires creating links in /nix/store/.links to all files in the store. However, this means that if we delete a store path, no files are actually deleted because links in /nix/store/.links still exists. So we need to check /nix/store/.links for files with a link count of 1 and delete them.
2012-07-23Automatically optimise the Nix store when a new path is addedEelco Dolstra
Auto-optimisation is enabled by default. It can be turned off by setting auto-optimise-store to false in nix.conf.
2012-07-23optimiseStore(): Use a content-addressed file store in /nix/store/.linksEelco Dolstra
optimiseStore() now creates persistent, content-addressed hard links in /nix/store/.links. For instance, if it encounters a file P with hash H, it will create a hard link P' = /nix/store/.link/<H> to P if P' doesn't already exist; if P' exist, then P is replaced by a hard link to P'. This is better than the previous in-memory map, because it had the tendency to unnecessarily replace hard links with a hard link to whatever happened to be the first file with a given hash it encountered. It also allows on-the-fly, incremental optimisation.
2012-07-23Use lutimes() if available to canonicalise the timestamp of symlinksEelco Dolstra
Also use utimes() instead of utime() if lutimes() is not available.
2012-07-18Use "#pragma once" to prevent repeated header file inclusionEelco Dolstra
2012-07-18Merge branch 'master' into no-manifestsEelco Dolstra
2012-07-17Add function queryPathFromHashPart()Eelco Dolstra
To implement binary caches efficiently, Hydra needs to be able to map the hash part of a store path (e.g. "gbg...zr7") to the full store path (e.g. "/nix/store/gbg...kzr7-subversion-1.7.5"). (The binary cache mechanism uses hash parts as a key for looking up store paths to ensure privacy.) However, doing a search in the Nix store for /nix/store/<hash>* is expensive since it requires reading the entire directory. queryPathFromHashPart() prevents this by doing a cheap database lookup.
2012-07-17Return an exit code of 100 for cached failed buildsEelco Dolstra
Exit code 100 should be returned for all permanent failures. This includes cached failures. Fixes #34.
2012-07-17Update Nix 1.1 release notesEelco Dolstra
2012-07-17Allow disabling log compressionEelco Dolstra
2012-07-11Update the other substitutersEelco Dolstra
2012-07-11Replace hasSubstitutes() with querySubstitutablePaths()Eelco Dolstra
querySubstitutablePaths() takes a set of paths, so this greatly reduces daemon <-> client latency.
2012-07-11Add a function queryValidPaths()Eelco Dolstra
queryValidPaths() combines multiple calls to isValidPath() in one. This matters when using the Nix daemon because it reduces latency. For instance, on "nix-env -qas \*" it reduces execution time from 5.7s to 4.7s (which is indistinguishable from the non-daemon case).
2012-07-11Rename queryValidPaths() to queryAllValidPaths()Eelco Dolstra
2012-07-11Implement querySubstitutablePathInfos() in the daemonEelco Dolstra
Also removed querySubstitutablePathInfo().
2012-07-08build.cc: Don't use hasSubstitute()Eelco Dolstra
Instead make a single call to querySubstitutablePathInfo() per derivation output. This is faster and prevents having to implement the "have" function in the binary cache substituter.
2012-07-06download-from-binary-cache: parallelise fetching of NAR info filesEelco Dolstra
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.
2012-06-27nix-store -r: do substitutions in parallelEelco Dolstra
I.e. when multiple non-derivation arguments are passed to ‘nix-store -r’ to be substituted, do them in parallel.
2012-06-27Mount an empty /dev/shm tmpfs in the chrootEelco Dolstra
This ensures that whatever the builder writes in /dev/shm is automatically cleaned up.
2012-06-27Check the return code of the clone() callEelco Dolstra
2012-06-25When using chroots, use a private PID namespaceEelco Dolstra
In a private PID namespace, processes have PIDs that are separate from the rest of the system. The initial child gets PID 1. Processes in the chroot cannot see processes outside of the chroot. This improves isolation between builds. However, processes on the outside can see processes in the chroot and send signals to them (if they have appropriate rights). Since the builder gets PID 1, it serves as the reaper for zombies in the chroot. This might turn out to be a problem. In that case we'll need to have a small PID 1 process that sits in a loop calling wait().
2012-06-25Use a private UTS namespace to provide a deterministic host/domain name to ↵Eelco Dolstra
builders In chroot builds, set the host name to "localhost" and the domain name to "(none)" (the latter being the kernel's default). This improves determinism a bit further. P.S. I have to idea what UTS stands for.
2012-06-23Improve error messageEelco Dolstra
2012-06-23In chroot builds, use a private SysV IPC namespaceEelco Dolstra
This improves isolation a bit further, and it's just one extra flag in the unshare() call. P.S. It would be very cool to use CLONE_NEWPID (to put the builder in a private PID namespace) as well, but that's slightly more risky since having a builder start as PID 1 may cause problems.
2012-06-23In chroot builds, use a private network namespaceEelco Dolstra
On Linux it's possible to run a process in its own network namespace, meaning that it gets its own set of network interfaces, disjunct from the rest of the system. We use this to completely remove network access to chroot builds, except that they get a private loopback interface. This means that: - Builders cannot connect to the outside network or to other processes on the same machine, except processes within the same build. - Vice versa, other processes cannot connect to processes in a chroot build, and open ports/connections do not show up in "netstat". - If two concurrent builders try to listen on the same port (e.g. as part of a test), they no longer conflict with each other. This was inspired by the "PrivateNetwork" flag in systemd.
2012-05-30Compress build logs on the fly using bzip2Eelco Dolstra
2012-05-29Reserve some disk space for the garbage collectorEelco Dolstra
We can't open a SQLite database if the disk is full. Since this prevents the garbage collector from running when it's most needed, we reserve some dummy space that we can free just before doing a garbage collection. This actually revives some old code from the Berkeley DB days. Fixes #27.
2012-05-29Add option ‘build-keep-log’ to enable/disable writing of build logsEelco Dolstra
Fixes #26.
2012-04-30* Add an option ‘build-use-substitutes’, which can be set to ‘false’Eelco Dolstra
to disable use of substitutes; i.e., force building from source. Fixes Nix/221.
2012-04-30Handle EPERM when creating a hard link for the chrootEelco Dolstra
There is a race condition when doing parallel builds with chroots and the immutable bit enabled. One process may call makeImmutable() before the other has called link(), in which case link() will fail with EPERM. We could retry or wrap the operation in a lock, but since this condition is rare and I'm lazy, we just use the existing copy fallback. Fixes #9.
2012-04-23Merge pull request #2 from viric/masterEelco Dolstra
Again, adding the sync option
2012-04-16Fix obscure race condition in GC root creationEelco Dolstra
This should fix rare Hydra errors of the form: error: symlinking `/nix/var/nix/gcroots/per-user/hydra/hydra-roots/7sfhs5fdmjxm8sqgcpd0pgcsmz1kq0l0-nixos-iso-0.1pre33785-33795' to `/nix/store/7sfhs5fdmjxm8sqgcpd0pgcsmz1kq0l0-nixos-iso-0.1pre33785-33795': File exists
2012-04-15Close almost all file descriptors in the builderEelco Dolstra
This regression was accidentally introduced in 35355fc1fcffbe859395e360c0a6a1463f137d63.
2012-04-05On Linux, pretend we're building on Linux 2.6Eelco Dolstra
Setting the UNAME26 personality causes "uname" to return "2.6.x", regardless of the kernel version. This improves determinism in a few misbehaved packages.
2012-03-26Mac OS X fixEelco Dolstra
2012-03-26Delete non-directory valid paths right awayEelco Dolstra
It's unlikely that rename() is faster than unlink() on a regular file or symlink, so don't bother.
2012-03-26Make the garbage collector more concurrentEelco Dolstra
Make the garbage collector more concurrent by deleting valid paths outside the region where we're holding the global GC lock. This should greatly reduce the time during which new builds are blocked, since the deletion accounts for the vast majority of the time spent in the GC. To ensure that this is safe, the valid paths are invalidated and renamed to some arbitrary path while we're holding the lock. This ensures that we when we finally delete the path, it's not a (newly) valid or locked path.
2012-03-26Remove the --max-links GC optionEelco Dolstra
We don't need this anymore now that current filesystems support more than 32,000 files in a directory.
2012-03-22Fixing the default of sync-before-registeringLluís Batlle i Rossell
Setting 'false' as default, as suggested by Eelco. I also added a comment about the setting in the code.
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