Age | Commit message (Collapse) | Author | Files | Lines |
|
|
|
|
|
E.g. to install "hello" from the latest Nixpkgs:
$ nix-build '<nixpkgs>' -A hello -I nixpkgs=https://nixos.org/channels/nixpkgs-unstable/nixexprs.tar.xz
Or to install a specific version of NixOS:
$ nixos-rebuild switch -I nixpkgs=https://github.com/NixOS/nixpkgs/archive/63def04891a0abc328b1b0b3a78ec02c58f48583.tar.gz
|
|
|
|
|
|
This is because we don't want to do HTTP requests on every evaluation,
even though we can prevent a full redownload via the cached ETag. The
default is one hour.
|
|
ETags are used to prevent redownloading unchanged files.
|
|
This function downloads and unpacks the given URL at evaluation
time. This is primarily intended to make it easier to deal with Nix
expressions that have external dependencies. For instance, to fetch
Nixpkgs 14.12:
with import (fetchTarball https://github.com/NixOS/nixpkgs-channels/archive/nixos-14.12.tar.gz) {};
Or to fetch a specific revision:
with import (fetchTarball https://github.com/NixOS/nixpkgs/archive/2766a4b44ee6eafae03a042801270c7f6b8ed32a.tar.gz) {};
This patch also adds a ‘fetchurl’ builtin that downloads but doesn't
unpack its argument. Not sure if it's useful though.
|
|
|
|
This doesn't work anymore if the "strict" chroot mode is
enabled. Instead, add Nix's store path as a dependency. This ensures
that its closure is present in the chroot.
|
|
|
|
If ‘--option restrict-eval true’ is given, the evaluator will throw an
exception if an attempt is made to access any file outside of the Nix
search path. This is primarily intended for Hydra, where we don't want
people doing ‘builtins.readFile ~/.ssh/id_dsa’ or stuff like that.
|
|
|
|
baseNameOf: Don't copy paths to the store first
|
|
The DT_UNKNOWN fallback code was getting the type of the wrong path,
causing readDir to report "directory" as the type of every file.
Reported by deepfire on IRC.
|
|
|
|
|
|
|
|
Code that links to libnixexpr (e.g. plugins loaded with importNative, or
nix-exec) may want to provide custom value types and operations on
values of those types. For example, nix-exec is currently using sets
where a custom IO value type would be more appropriate. This commit
provides a generic hook for such types in the form of tExternal and the
ExternalBase virtual class, which contains all functions necessary for
libnixexpr's type-polymorphic functions (e.g. `showType`) to be
implemented.
|
|
The function ‘builtins.match’ takes a POSIX extended regular
expression and an arbitrary string. It returns ‘null’ if the string
does not match the regular expression. Otherwise, it returns a list
containing substring matches corresponding to parenthesis groups in
the regex. The regex must match the entire string (i.e. there is an
implied "^<pat>$" around the regex). For example:
match "foo" "foobar" => null
match "foo" "foo" => []
match "f(o+)(.*)" "foooobar" => ["oooo" "bar"]
match "(.*/)?([^/]*)" "/dir/file.nix" => ["/dir/" "file.nix"]
match "(.*/)?([^/]*)" "file.nix" => [null "file.nix"]
The following example finds all regular files with extension .nix or
.patch underneath the current directory:
let
findFiles = pat: dir: concatLists (mapAttrsToList (name: type:
if type == "directory" then
findFiles pat (dir + "/" + name)
else if type == "regular" && match pat name != null then
[(dir + "/" + name)]
else []) (readDir dir));
in findFiles ".*\\.(nix|patch)" (toString ./.)
|
|
|
|
Before this there was a bug where a `find` was being called on a
not-yet-sorted set. The code was just a mess before anyway, so I cleaned
it up while fixing it.
|
|
Avoids an assertion
|
|
|
|
Useful for importNative plugins
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Workaround for
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=41174. This caused
hydra-eval-jobs to ignore SIGINT.
|
|
Note that unlike ‘lib.deepSeq’ in Nixpkgs, this handles cycles.
|
|
|
|
It returns the size of value, including all other values and
environments reachable from it. It is intended for debugging memory
consumption issues.
|
|
|
|
|
|
|
|
|
|
The name ‘nixPath’ breaks existing code.
|
|
src/libexpr/primops.cc:42:8: error: looser throw specifier for 'virtual nix::InvalidPathError::~InvalidPathError()'
src/libexpr/nixexpr.hh:12:1: error: overriding 'virtual nix::EvalError::~EvalError() noexcept (true)'
http://hydra.nixos.org/build/12385750
|
|
Fixes #294.
|
|
allow-arbitrary-code-during-evaluation option is true (default false)
|
|
This can be used to import a dynamic shared object and return an
arbitrary value, including new primops. This can be used both to test
new primops without having to recompile nix every time, and to build
specialized primops that probably don't belong upstream (e.g. a function
that calls out to gpg to decrypt a nixops secret as-needed).
The imported function should initialize the Value & as needed. A single
import can define multiple values by creating an attrset or list, of
course.
An example initialization function might look like:
extern "C" void initialize(nix::EvalState & state, nix::Value & v)
{
v.type = nix::tPrimOp;
v.primOp = NEW nix::PrimOp(myFun, 1, state.symbols.create("myFun"));
}
Then `builtins.importNative ./example.so "initialize"` will evaluate to
the primop defined in the myFun function.
|
|
We're not catching these anywhere.
|
|
|
|
In addition to reducing duplication, this fixes both import from
derivation and import of derivation for scopedImport
|
|
There really is no case I can think of where taking the context into
account is useful. Mostly it's just very inconvenient.
|
|
|
|
Nix search path lookups like <nixpkgs> are now desugared to ‘findFile
nixPath <nixpkgs>’, where ‘findFile’ is a new primop. Thus you can
override the search path simply by saying
let
nixPath = [ { prefix = "nixpkgs"; path = "/my-nixpkgs"; } ];
in ... <nixpkgs> ...
In conjunction with ‘scopedImport’ (commit
c273c15cb13bb86420dda1e5341a4e19517532b5), the Nix search path can be
propagated across imports, e.g.
let
overrides = {
nixPath = [ ... ] ++ builtins.nixPath;
import = fn: scopedImport overrides fn;
scopedImport = attrs: fn: scopedImport (overrides // attrs) fn;
builtins = builtins // overrides;
};
in scopedImport overrides ./nixos
|