such as open files, current directories, mmaped files, etc. This is
inherently unportable, but it's easy to adapt this script to other
platforms. Currently we call `lsof' and try to read various bits in
/proc/NNN.
The goal is to prevent the garbage collector from removing store
paths that are no longer reachable from a permanent root but that
are still in use (for instance, after the user has done "nix-env -e"
on a running program).
target no longer applies to any available release. This is a
partial fix for NIX-34 (when producing linear patch sequences
between releases, the number of patches grows without bound).
useful way to transfer the closure of a store path to another
machine.
These commands provide functionality previously possible through
`nix-push --copy'. However, they are much more convenient in many
situations (though possibly less efficient).
Example:
$ nix-pack-closure /nix/store/hj232g1r...-subversion-1.3.0 > svn.closure
(on another machine:)
$ nix-unpack-closure < svn.closure
Note that Subversion is added to the store, but not installed into a
user environment. One should do `nix-env -i
/nix/store/hj232g1r...-subversion-1.3.0' for that.
Another example: copy the application Azureus to the machine
`scratchy' through ssh:
$ nix-pack-closure $(which azureus) | ssh scratchy nix-unpack-closure
nix-store query options `--referer' and `--referer-closure' have
been changed to `--referrer' and `--referrer-closure' (but the old
ones are still accepted for compatibility).
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).
handle it. It crashed on the 234 MB tetex archive. Probably we
will never be able to handle archives of that size on 32-bit
machines (because bsdiff does everything in memory requiring
max(17*n,9*n+m)+O(1) bytes, so the address space simply isn't
there).
derivations. This is mostly to simplify the implementation of
nix-prefetch-{url, svn}, which now work properly in setuid
installations.
* Enforce valid store names in `nix-store --add / --add-fixed'.
occurances of a component. If the shortest path distance between a
component P and Q in the referers graph is D, then the contribution
of Q to the use of P is 1 / R^D, where R >= 1, typically 2. This
expresses that distant indirect uses are less important than nearby
uses.
For instance, this can disambiguate between the bootstrap GCC in
Nixpkgs and the GCC of the final stdenv (the former has more uses,
but they are further away), and between the GCC of the final stdenv
and the GCC+G77 build (the latter has very few uses).
