Pjotr Prins wrote:
For some packages a mirror would be nice - as either they are changed
too often, or not often enough. What is the policy here? Can we
provide two URLs? The main one and a fallback if the main goes out of
synch?
Does NIX have a source mirror for that purpose? It is important for a
stable version.
Yes, there is a source mirror mechanism. Two, actually.
First, there is the mirror://{sourceforge,gnu,kernel,...} scheme for packages
that already have many mirrors (no use for us to mirror them again). The
mirrors are defined in pkgs/build-support/fetchurl/mirrors.nix.
Second, we have our own transparent hash-indexed mirroring scheme: when fetchurl
tries to download something with MD5 hash X, it will first try to download
http://nix.cs.uu.nl/dist/tarballs/md5/X (similar for SHA-1 and SHA-256 hashes).
More of those mirrors can be defined in the "hashedMirrors" attribute in
pkgs/build-support/fetchurl/mirrors.nix.
The mirror at http://nix.cs.uu.nl/dist/tarballs isn't complete though. I have a
script that copies all tarballs used in Nixpkgs to that server, but I don't run
it very frequently (usually before a Nixpkgs release).
--
Eelco Dolstra | http://www.st.ewi.tudelft.nl/~dolstra/
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