lix -

Age	Commit message (Collapse)	Author
2013-04-23	Fix --fallback with the binary cache substituter	Eelco Dolstra
	Reported by Peter Simons.
2013-04-23	Test NAR info caching	Eelco Dolstra

2013-01-02	Reinstate the http://nixos.org/binary-cache default for the binary-caches ↵	Eelco Dolstra
	setting
2012-12-21	download-from-binary-cache: Use the channels of the calling user rather than ↵	Eelco Dolstra
	root This should make live easier for single-user (non-daemon) installations. Note that when the daemon is used, the "calling user" is root so we're not using any untrusted caches.
2012-12-06	Set a long SQLite timeout in the binary cache substituter	Eelco Dolstra

2012-11-06	download-from-binary-cache: Try next cache if downloading a NAR fails	Eelco Dolstra

2012-11-06	Process binary caches in order of priority	Eelco Dolstra
	Binary caches can now specify a priority in their nix-cache-info file. The binary cache substituter checks caches in order of priority. This is to ensure that fast, static caches like nixos.org/binary-cache are processed before slow, dynamic caches like hydra.nixos.org.
2012-11-06	Add an option ‘use-binary-caches’	Eelco Dolstra
	This allows disabling the use of binary caches, e.g. $ nix-build ... --option use-binary-caches false Note that $ nix-build ... --option binary-caches '' does not disable all binary caches, since the caches defined by channels will still be used.
2012-11-06	Fix "Not an ARRAY reference" error	Eelco Dolstra
	It's a mystery why this error is not triggered in the build farm (e.g. http://hydra.nixos.org/build/3265602). Ah well.
2012-10-17	nix-push: Only generate and copy a NAR if it doesn't already exist	Eelco Dolstra
	This prevents unnecessary and slow rebuilds of NARs that already exist in the binary cache.
2012-10-11	download-from-binary-cache: Remove duplicate entries in trustedURLs	Eelco Dolstra

2012-10-02	Add operation ‘nix-store --repair-path’	Eelco Dolstra
	This operation allows fixing corrupted or accidentally deleted store paths by redownloading them using substituters, if available. Since the corrupted path cannot be replaced atomically, there is a very small time window (one system call) during which neither the old (corrupted) nor the new (repaired) contents are available. So repairing should be used with some care on critical packages like Glibc.
2012-09-21	Style fix	Eelco Dolstra

2012-09-13	Put a time-to-live on negative binary cache lookups	Eelco Dolstra
	Negative lookups are purged from the DB after a day, at most once per day. However, for non-"have" lookups (e.g. all except "nix-env -qas"), negative lookups are ignored after one hour. This is to ensure that you don't have to wait a day for an operation like "nix-env -i" to start using new binaries in the cache. Should probably make this configurable.
2012-09-13	Doh	Eelco Dolstra

2012-09-13	Delete manifests in "nix-channel --remove" or when a binary cache is available	Eelco Dolstra

2012-09-12	Compatibility fix for WWW::Curl < 4.14	Eelco Dolstra
	Older versions of WWW::Curl don't support scalar references for CURLOPT_WRITEDATA directly. http://hydra.nixos.org/build/3017188
2012-08-27	Disable the binary cache substituter by default for now	Eelco Dolstra

2012-08-27	Drop dependency on List::MoreUtils	Eelco Dolstra

2012-08-01	nix-channel: Use binary caches advertised by channels	Eelco Dolstra
	Channels can now advertise a binary cache by creating a file <channel-url>/binary-cache-url. The channel unpacker puts these in its "binary-caches" subdirectory. Thus, the URLS of the binary caches for the channels added by root appear in /nix/var/nix/profiles/per-user/eelco/channels/binary-caches/*. The binary cache substituter reads these and adds them to the list of binary caches.
2012-08-01	download-from-binary-cache: Remove duplicate URLs	Eelco Dolstra

2012-08-01	Report substituter errors to clients of the Nix daemon	Eelco Dolstra

2012-07-31	Allow daemon users to override ‘binary-caches’	Eelco Dolstra
	For security reasons, daemon users can only specify caches that appear in the ‘binary-caches’ and ‘trusted-binary-caches’ options in nix.conf.
2012-07-30	Do some validation of URLs	Eelco Dolstra

2012-07-30	Get rid of $NIX_BINARY_CACHES	Eelco Dolstra
	You can use ‘--option binary-caches URLs’ instead.
2012-07-27	Allow a binary cache to declare that it doesn't support "nix-env -qas"	Eelco Dolstra
	Querying all substitutable paths via "nix-env -qas" is potentially hard on a server, since it involves sending thousands of HEAD requests. So a binary cache must now have a meta-info file named "nix-cache-info" that specifies whether the server wants this. It also specifies the store prefix so that we don't send useless queries to a binary cache for a different store prefix.
2012-07-27	Let build.cc verify the expected hash of a substituter's output	Eelco 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.
2012-07-27	download-using-manifests: Don't use nix-prefetch-url	Eelco Dolstra
	Instead call curl directly and pipe it into ‘nix-store --restore’. This saves I/O and prevents creating garbage in the Nix store.
2012-07-27	Remove trailing whitespace / tabs	Eelco Dolstra

2012-07-27	download-from-binary-cache: Only use the default cache for /nix/store	Eelco Dolstra

2012-07-26	download-from-binary-cache: Support file://	Eelco Dolstra
	The file:// URI schema requires checking for errors in a more general way. Also, don't cache file:// lookups.
2012-07-18	download-from-binary-cache: Print correct URL	Eelco Dolstra

2012-07-17	Print some debug output	Eelco Dolstra

2012-07-11	Set the User-Agent header to "Nix/<version>"	Eelco Dolstra

2012-07-11	download-from-binary-cache: Use HEAD requests if possible	Eelco Dolstra
	In "nix-env -qas", we don't need the substitute info, we just need to know if it exists. This can be done using a HTTP HEAD request, which saves bandwidth. Note however that curl currently has a bug that prevents it from reusing HTTP connections if HEAD requests return a 404: https://sourceforge.net/tracker/?func=detail&aid=3542731&group_id=976&atid=100976 Without the patch attached to the issue, using HEAD is actually quite a bit slower than GET.
2012-07-11	Cleanup	Eelco Dolstra

2012-07-09	download-from-binary-cache: add nix.conf options	Eelco Dolstra

2012-07-08	Cleanup	Eelco Dolstra

2012-07-06	download-from-binary-cache: parallelise fetching of NAR info files	Eelco 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.
2012-07-06	download-from-binary-cache: use WWW::Curl	Eelco Dolstra
	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 caching	Eelco Dolstra
	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 info	Eelco Dolstra

2012-07-03	download-from-binary-cache: strip trailing / from URLs	Eelco Dolstra

2012-07-03	download-from-binary-cache: cache binary cache info in a SQLite DB	Eelco Dolstra

2012-07-02	download-from-binary-cache: Verify NAR hashes	Eelco Dolstra

2012-07-02	Binary caches: use a better key	Eelco Dolstra
	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 caches	Eelco Dolstra

2012-07-01	Allow both bzip2 and xz compression	Eelco Dolstra

2012-06-29	First attempt at the manifest-less substituter	Eelco Dolstra