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need any info on substitutable paths, we just call the substituters
(such as download-using-manifests.pl) directly. This means that
it's no longer necessary for nix-pull to register substitutes or for
nix-channel to clear them, which makes those operations much faster
(NIX-95). Also, we don't have to worry about keeping nix-pull
manifests (in /nix/var/nix/manifests) and the database in sync with
each other.
The downside is that there is some overhead in calling an external
program to get the substitutes info. For instance, "nix-env -qas"
takes a bit longer.
Abolishing the substitutes table also makes the logic in
local-store.cc simpler, as we don't need to store info for invalid
paths. On the downside, you cannot do things like "nix-store -qR"
on a substitutable but invalid path (but nobody did that anyway).
* Never catch interrupts (the Interrupted exception).
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try $url.bz2 first.
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and store the manifests in the Nix store. (So now
/nix/var/nix/manifests/ just contains symlinks to the store and is
searched for GC roots.)
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NIX_DOWNLOAD_CACHE is set, then nix-prefetch-url will store the hash
and timestamp of downloaded files in the directory
$NIX_DOWNLOAD_CACHE. This allows it to figure out if the file is
still in the Nix store.
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path can be created by copying it from another location in the file
system. This is useful in the NixOS installation.
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a different location than the user's. This makes channels usable as
a source deployment mechanism for people who install Nix under
non-standard prefixes. (NIX-57)
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the parent runs before the child, it closes some pipe file
descriptors which causes the child to fail due to a bad file
descriptor. So we just use the normal open() function instead.
This fixes NIX-14 (intermittent nix-pull failures).
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* Removed some dead code (successor stuff) from nix-push.
* Updated terminology in the tests (store expr -> drv path).
* Check that the deriver is set properly in the tests.
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* Use force flag in `mv' to prevent silly interactive questions (this
happens with shared Nix stores).
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invariant by registering references through the manifest.
* Added a test for nix-pull.
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* Use the new patch downloader.
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* Accept the NarHash line.
* Clear substitutes in `nix-channel --update'.
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* Add /nix/var/nix/manifests directory.
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substitute mechanism) creates a store path by downloading full NAR
archives and/or patches specified in the available manifests.
Any combination of present paths, full downloads, and patches can be
used to construct the target path. In particular, patches can be
chained in sequence; and full NAR archives of the target path can be
omitted (i.e., patch-only deployment is possible). A shortest path
algorithm is used to find the smallest set of files to be downloaded
(the edge weights are currently file sizes, but one can imagine
taking the network speed to the various source into account).
Patches are binary deltas between two store paths. To be precise,
they are the output of the `bsdiff' program applied to the NAR
archives obtained by dumping (`nix-store --dump') the two store
paths. The advantage of diff'ing NAR archives (and not, say, doing
file-by-file diffs) is that file renames/moves are handled
automatically. The disadvantage is that we cannot optimise creation
of unchanged files (by hard-linking).
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* Made the dependencies on bzip2 and the shell explicit.
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* Use curl instead of wget.
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--register-[substitutes|successors].
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$ nix-instantiate --help
error: unknown flag `--help`
Try `nix-instantiate --help' for more information.
:-)
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"i686-linux" instead of "i686-suse-linux").
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The script nix-install-package takes a `Nix package file' (which
contains one or more derivations, along with URLs of Nix caches),
unpacks it, pulls the caches, and installs the derivations in the
user's environment.
For best results, associate the command `xterm -e
/nix/bin/nix-install-package' with the MIME type
`application/x-nix-package' and visit
http://losser.st-lab.cs.uu.nl/~eelco/test/.
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* Fixed a segfault caused by the buffering of stderr.
* Fix now allows the specification of the full output path. This
should be used with great care, since it by-passes the normal hash
generation.
* Incremented the version number to 0.4 (prerelease).
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store, and print its hash.
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the same time.
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substituting for (obvious, really).
* For greater efficiency, nix-pull/unnar will place the output in a
path that is probably the same as what is actually needed, thus
preventing a path copy.
* Even if a output id is given in a Fix package expression, ensure
that the resulting Nix derive expression has a different id. This
is because Nix expressions that are semantically equivalent (i.e.,
build the same result) might be different w.r.t. efficiency or
divergence. It is absolutely vital for the substitute mechanism
that such expressions are not used interchangeably.
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