pyrox.dev
1{
2 runCommand,
3 git,
4 coccinelle,
5 python3,
6}:
7
8/*
9 Creates a patch that replaces every instantiation of GSettings in a C project
10 with a code that loads a GSettings schema from a hardcoded path.
11
12 This is useful so that libraries can find schemas even though Nix lacks
13 a standard location like /usr/share, where GSettings system could look for schemas.
14 The derivation is is somewhat dependency-heavy so it is best used as part of an update script.
15
16 For each schema id referenced in the source code (e.g. org.gnome.evolution),
17 a variable name such as `EVOLUTION` must be provided.
18 It will end up in the generated patch as `@EVOLUTION@` placeholder, which should be replaced at build time
19 with a path to the directory containing a `gschemas.compiled` file that includes the schema.
20
21
22 Arguments:
23 - `src`: source to generate the patch for.
24
25 - `schemaIdToVariableMapping`: attrset assigning schema ids to variable names.
26 All used schemas must be listed.
27
28 For example, `{ "org.gnome.evolution" = "EVOLUTION_SCHEMA_PATH"; }`
29 hardcodes looking for `org.gnome.evolution` into `@EVOLUTION_SCHEMA_PATH@`.
30
31 - `patches`: A list of patches to apply before generating the patch.
32
33 Example:
34 passthru = {
35 hardcodeGsettingsPatch = makeHardcodeGsettingsPatch {
36 inherit (finalAttrs) src;
37 schemaIdToVariableMapping = {
38 ...
39 };
40 };
41
42 updateScript =
43 let
44 updateSource = ...;
45 updatePatch = _experimental-update-script-combinators.copyAttrOutputToFile "evolution-ews.hardcodeGsettingsPatch" ./hardcode-gsettings.patch;
46 in
47 _experimental-update-script-combinators.sequence [
48 updateSource
49 updatePatch
50 ];
51 };
52 }
53*/
54{
55 src,
56 patches ? [ ],
57 schemaIdToVariableMapping,
58}:
59
60runCommand
61 "hardcode-gsettings.patch"
62 {
63 inherit src patches;
64 nativeBuildInputs = [
65 git
66 coccinelle
67 python3 # For patch script
68 ];
69 }
70 ''
71 unpackPhase
72 cd "''${sourceRoot:-.}"
73 patchPhase
74 set -x
75 cp ${builtins.toFile "glib-schema-to-var.json" (builtins.toJSON schemaIdToVariableMapping)} ./glib-schema-to-var.json
76 git init
77 git add -A
78 spatch --sp-file "${./hardcode-gsettings.cocci}" --dir . --in-place
79 git diff > "$out"
80 ''