pyrox.dev
1/* Some functions for manipulating meta attributes, as well as the
2 name attribute. */
3
4{ lib }:
5
6rec {
7
8
9 /* Add to or override the meta attributes of the given
10 derivation.
11
12 Example:
13 addMetaAttrs {description = "Bla blah";} somePkg
14 */
15 addMetaAttrs = newAttrs: drv:
16 drv // { meta = (drv.meta or {}) // newAttrs; };
17
18
19 /* Disable Hydra builds of given derivation.
20 */
21 dontDistribute = drv: addMetaAttrs { hydraPlatforms = []; } drv;
22
23
24 /* Change the symbolic name of a package for presentation purposes
25 (i.e., so that nix-env users can tell them apart).
26 */
27 setName = name: drv: drv // {inherit name;};
28
29
30 /* Like `setName', but takes the previous name as an argument.
31
32 Example:
33 updateName (oldName: oldName + "-experimental") somePkg
34 */
35 updateName = updater: drv: drv // {name = updater (drv.name);};
36
37
38 /* Append a suffix to the name of a package (before the version
39 part). */
40 appendToName = suffix: updateName (name:
41 let x = builtins.parseDrvName name; in "${x.name}-${suffix}-${x.version}");
42
43
44 /* Apply a function to each derivation and only to derivations in an attrset.
45 */
46 mapDerivationAttrset = f: set: lib.mapAttrs (name: pkg: if lib.isDerivation pkg then (f pkg) else pkg) set;
47
48 /* Set the nix-env priority of the package.
49 */
50 setPrio = priority: addMetaAttrs { inherit priority; };
51
52 /* Decrease the nix-env priority of the package, i.e., other
53 versions/variants of the package will be preferred.
54 */
55 lowPrio = setPrio 10;
56
57 /* Apply lowPrio to an attrset with derivations
58 */
59 lowPrioSet = set: mapDerivationAttrset lowPrio set;
60
61
62 /* Increase the nix-env priority of the package, i.e., this
63 version/variant of the package will be preferred.
64 */
65 hiPrio = setPrio (-10);
66
67 /* Apply hiPrio to an attrset with derivations
68 */
69 hiPrioSet = set: mapDerivationAttrset hiPrio set;
70
71
72 /* Check to see if a platform is matched by the given `meta.platforms`
73 element.
74
75 A `meta.platform` pattern is either
76
77 1. (legacy) a system string.
78
79 2. (modern) a pattern for the platform `parsed` field.
80
81 We can inject these into a patten for the whole of a structured platform,
82 and then match that.
83 */
84 platformMatch = platform: elem: let
85 pattern =
86 if builtins.isString elem
87 then { system = elem; }
88 else { parsed = elem; };
89 in lib.matchAttrs pattern platform;
90
91 /* Check if a package is available on a given platform.
92
93 A package is available on a platform if both
94
95 1. One of `meta.platforms` pattern matches the given platform.
96
97 2. None of `meta.badPlatforms` pattern matches the given platform.
98 */
99 availableOn = platform: pkg:
100 lib.any (platformMatch platform) pkg.meta.platforms &&
101 lib.all (elem: !platformMatch platform elem) (pkg.meta.badPlatforms or []);
102}