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* Use the new patch downloader.
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unreachable paths that haven't been used for N hours. For instance,
`nix-collect-garbage --min-age 168' only deletes paths that haven't
been accessed in the last week.
This is useful for instance in the build farm where many derivations
can be shared between consecutive builds, and we wouldn't want a
garbage collect to throw them all away. We could of course register
them as roots, but then we'd to unregister them at some point, which
would be a pain to manage. The `--min-age' flag gives us a sort of
MRU caching scheme.
BUG: this really shouldn't be in gc.cc since that violates
mechanism/policy separation.
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doesn't just print the set of paths that should be deleted. So
there is no more need to pipe the result into `nix-store --delete'
(which doesn't even exist anymore).
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* Made the dependencies on bzip2 and the shell explicit.
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default -> default-94-link
default-82-link -> /nix/store/cc4480...
default-83-link -> /nix/store/caeec8...
...
default-94-link -> /nix/store/2896ca...
experimental -> experimental-2-link
experimental-1-link -> /nix/store/cc4480...
experimental-2-link -> /nix/store/a3148f...
* `--profile' / `-p' -> `--switch-profile' / `-S'
* `--link' / `-l' -> `--profile' / `-p'
* The default profile is stored in $prefix/var/nix/profiles.
$prefix/var/nix/links is gone. Profiles can be stored anywhere.
* The current profile is now referenced from ~/.nix-profile, not
~/.nix-userenv.
* The roots to the garbage collector now have extension `.gcroot', not
`.id'.
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Renamed `fstateRefs' to `fstateRequisites'. The semantics of this
function is that it returns a list of all paths necessary to realise
a given expression. For a derive expression, this is the union of
requisites of the inputs; for a slice expression, it is the path of
each element in the slice. Also included are the paths of the
expressions themselves. Optionally, one can also include the
requisites of successor expressions (to recycle intermediate
results).
* `nix-switch' now distinguishes between an expression and its normal
form. Usually, only the normal form is registered as a root of the
garbage collector. With the `--source-root' flag, it will also
register the original expression as a root.
* `nix-collect-garbage' now has a flag `--keep-successors' which
causes successors not to be included in the list of garbage paths.
* `nix-collect-garbage' now has a flag `--invert' which will print all
paths that should *not* be garbage collected.
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