This allows you to refer to an input from another flake. For example,
$ nix run --inputs-from /path/to/hydra nixpkgs#hello
runs 'hello' from the 'nixpkgs' inputs of the 'hydra' flake.
Fixes#3769.
'nix run' will try to run $out/bin/<name>, where <name> is the
derivation name (excluding the version). This often works well:
$ nix run nixpkgs#hello
Hello, world!
$ nix run nix -- --version
nix (Nix) 2.4pre20200626_adf2fbb
$ nix run patchelf -- --version
patchelf 0.11.20200623.e61654b
$ nix run nixpkgs#firefox -- --version
Mozilla Firefox 77.0.1
$ nix run nixpkgs#gimp -- --version
GNU Image Manipulation Program version 2.10.14
though not always:
$ nix run nixpkgs#git
error: unable to execute '/nix/store/kp7wp760l4gryq9s36x481b2x4rfklcy-git-2.25.4/bin/git-minimal': No such file or directory
E.g.
$ nix run nixpkgs#hello
error: --- Error ---------- nix
flake 'flake:nixpkgs' does not provide attribute 'apps.x86_64-linux.hello' or 'hello'
instead of
$ nix run nixpkgs#hello
error: --- Error ---------- nix
flake 'flake:nixpkgs' does not provide attribute 'hello'
On nix-env -qa -f '<nixpkgs>', this reduces maximum RSS by 20970 KiB
and runtime by 0.8%. This is mostly because we're not parsing the hash
part as a hash anymore (just validating that it consists of base-32
characters).
Also, replace storePathToHash() by StorePath::hashPart().
This fixes an issue where lockfile generation was not idempotent:
after updating a lockfile, a "follows" node would end up pointing to a
new copy of the node, rather than to the original node.
Needed so that we can include it as a logger in loggers.cc without
adding a dependency on nix
This also requires moving names.hh to libutil to prevent a circular
dependency between libmain and libexpr
Make the printing of the build logs systematically go through the
logger, and replicate the behavior of `no-build-output` by having two
different loggers (one that prints the build logs and one that doesn't)
