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.
get the basename of the channel URL (e.g., nixpkgs-unstable). The
top-level Nix expression of the channel is now an attribute set, the
attributes of which are the individual channels (e.g.,
{nixpkgs_unstable = ...; strategoxt_unstable = ...}). This makes
attribute paths ("nix-env -qaA" and "nix-env -iA") more sensible,
e.g., "nix-env -iA nixpkgs_unstable.subversion".
another machine through ssh. E.g.,
$ nix-copy-closure xyzzy $(which svn)
copies the closure of Subversion to machine `xyzzy'. This is like
`nix-pack-closure $(which svn) | ssh xyzzy', but it's much more
efficient since it only copies those paths that are missing on the
target machine.
* nix-unpack-closure: extract the top-level paths from the closure and
print them on stdout. This allows them to be installed, e.g.,
"nix-env -i $(nix-unpack-closure)". (NIX-64)
seconds without producing output on stdout or stderr (NIX-65). This
timeout can be specified using the `--max-silent-time' option or the
`build-max-silent-time' configuration setting. The default is
infinity (0).
* Fix a tricky race condition: if we kill the build user before the
child has done its setuid() to the build user uid, then it won't be
killed, and we'll potentially lock up in pid.wait(). So also send a
conventional kill to the child.
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)
* `nix-install-package --help' (NIX-9).
* `nix-install-package --non-interactive': don't prompt or pause.
* Tests for nix-install-package.
* Security fixes: filter the values obtained from the nixpkg.
package duplication present in (e.g.) a profile. It shows the
number of instances of each package in a closure, along with the
size in bytes of each instance as well as the "waste" (the
difference between the sum of the sizes of all instances and the
average size).
$ ./show-duplication.pl /nix/var/nix/profiles/default
gcc 11
3.3.6 19293318
3.4.4 21425257
...
average 14942970, waste 149429707
coreutils 6
...
average package duplication 1.87628865979381, total size 3486330471, total waste 1335324237, 38.3017114443825% wasted
This utility is useful for measuring the cost in terms of disk space
of the Nix approach.
old generations of *all* profiles in /nix/var/nix/profiles, then
runs the garbage collector. Quick way to get rid of all old stuff.
Of course, one cannot roll back to earlier points in time after
this.
