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Allow options with type "package" to be store paths

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For example, this allows writing

  nix.package = /nix/store/786mlvhd17xvcp2r4jmmay6jj4wj6b7f-nix-1.10pre4206_896428c;

Also, document types.package in the manual.
This commit is contained in:
Eelco Dolstra 2015-08-06 19:55:42 +02:00
parent fa7a0f24a4
commit 214d4fb73c
4 changed files with 30 additions and 4 deletions
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10
lib/attrsets.nix
View File

@ -221,6 +221,16 @@ rec {
isDerivation = x: isAttrs x && x ? type && x.type == "derivation";
/* Convert a store path to a fake derivation. */
toDerivation = path:
let path' = builtins.storePath path; in
{ type = "derivation";
name = builtins.unsafeDiscardStringContext (builtins.substring 33 (-1) (baseNameOf path'));
outPath = path';
outputs = [ "out" ];
};
/* If the Boolean `cond' is true, return the attribute set `as',
otherwise an empty attribute set. */
optionalAttrs = cond: as: if cond then as else {};

5
lib/strings.nix
View File

@ -218,4 +218,9 @@ rec {
# Format a number adding leading zeroes up to fixed width.
fixedWidthNumber = width: n: fixedWidthString width "0" (toString n);
# Check whether a value is a store path.
isStorePath = x: builtins.substring 0 1 (toString x) == "/" && dirOf (builtins.toPath x) == builtins.storeDir;
}

8
lib/types.nix
View File

@ -94,14 +94,16 @@ rec {
# derivation is a reserved keyword.
package = mkOptionType {
name = "derivation";
check = isDerivation;
merge = mergeOneOption;
check = x: isDerivation x || isStorePath x;
merge = loc: defs:
let res = mergeOneOption loc defs;
in if isDerivation res then res else toDerivation res;
};
path = mkOptionType {
name = "path";
# Hacky: there is no ‘isPath’ primop.
check = x: builtins.unsafeDiscardStringContext (builtins.substring 0 1 (toString x)) == "/";
check = x: builtins.substring 0 1 (toString x) == "/";
merge = mergeOneOption;
};

11
nixos/doc/manual/development/option-declarations.xml
View File

@ -106,6 +106,15 @@ options = {
</listitem>
</varlistentry>
<varlistentry>
<term><varname>types.package</varname></term>
<listitem>
<para>A derivation (such as <literal>pkgs.hello</literal>) or a
store path (such as
<filename>/nix/store/1ifi1cfbfs5iajmvwgrbmrnrw3a147h9-hello-2.10</filename>).</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>types.listOf</varname> <replaceable>t</replaceable></term>
<listitem>
@ -138,4 +147,4 @@ You can also create new types using the function
<varname>mkOptionType</varname>. See
<filename>lib/types.nix</filename> in Nixpkgs for details.</para>
</section>
</section>