79 lines
2.3 KiB
Nix
79 lines
2.3 KiB
Nix
{
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runCommand,
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git,
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coccinelle,
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python3,
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}:
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/*
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Creates a patch that replaces every instantiation of GSettings in a C project
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with a code that loads a GSettings schema from a hardcoded path.
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This is useful so that libraries can find schemas even though Nix lacks
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a standard location like /usr/share, where GSettings system could look for schemas.
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The derivation is is somewhat dependency-heavy so it is best used as part of an update script.
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For each schema id referenced in the source code (e.g. org.gnome.evolution),
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a variable name such as `EVOLUTION` must be provided.
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It will end up in the generated patch as `@EVOLUTION@` placeholder, which should be replaced at build time
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with a path to the directory containing a `gschemas.compiled` file that includes the schema.
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Arguments:
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- `src`: source to generate the patch for.
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- `schemaIdToVariableMapping`: attrset assigning schema ids to variable names.
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All used schemas must be listed.
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For example, `{ "org.gnome.evolution" = "EVOLUTION_SCHEMA_PATH"; }`
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hardcodes looking for `org.gnome.evolution` into `@EVOLUTION_SCHEMA_PATH@`.
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- `patches`: A list of patches to apply before generating the patch.
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Example:
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passthru = {
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hardcodeGsettingsPatch = makeHardcodeGsettingsPatch {
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inherit (finalAttrs) src;
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schemaIdToVariableMapping = {
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...
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};
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};
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updateScript =
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let
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updateSource = ...;
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updatePatch = _experimental-update-script-combinators.copyAttrOutputToFile "evolution-ews.hardcodeGsettingsPatch" ./hardcode-gsettings.patch;
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in
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_experimental-update-script-combinators.sequence [
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updateSource
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updatePatch
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];
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};
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}
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*/
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{
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src,
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patches ? [ ],
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schemaIdToVariableMapping,
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}:
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runCommand "hardcode-gsettings.patch"
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{
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inherit src patches;
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nativeBuildInputs = [
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git
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coccinelle
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python3 # For patch script
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];
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}
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''
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unpackPhase
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cd "''${sourceRoot:-.}"
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patchPhase
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set -x
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cp ${builtins.toFile "glib-schema-to-var.json" (builtins.toJSON schemaIdToVariableMapping)} ./glib-schema-to-var.json
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git init
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git add -A
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spatch --sp-file "${./hardcode-gsettings.cocci}" --dir . --in-place
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git diff > "$out"
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''
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