nixpkgs/pkgs/build-support/plugins.nix
Profpatsch 79dd4deda5 Ultrastar (#26524)
* ultrastardx-beta: init at 1.3.5

* libbass, libbass_fx: init at 24

* ultrastar-creator: init at 2017-04-12

* buildSupport/plugins.nix: add diffPlugins

Helper function to compare expected plugin lists to the found plugins.

* ultrastar-manager: init at 2017-05-24

The plugins are built in their own derivations, speeding up (re-)compilation.
The `diffPlugins` function from `beets` is reused to test for changes in the
plugin list on updates.

* beets: switch to diffPlugins

The function is basically just extracted for better reusability.
2017-06-14 11:29:31 +02:00

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{ stdenv }:
# helper functions for packaging programs with plugin systems
{
/* Takes a list of expected plugin names
* and compares it to the found plugins given in the file,
* one plugin per line.
* If the lists differ, the build fails with a nice message.
*
* This is helpful to ensure maintainers dont miss
* the addition or removal of a plugin.
*/
diffPlugins = expectedPlugins: foundPluginsFilePath: ''
# sort both lists first
plugins_expected=$(mktemp)
(${stdenv.lib.concatMapStrings (s: "echo \"${s}\";") expectedPlugins}) \
| sort -u > "$plugins_expected"
plugins_found=$(mktemp)
sort -u "${foundPluginsFilePath}" > "$plugins_found"
if ! mismatches="$(diff -y "$plugins_expected" "$plugins_found")"; then
echo "The the list of expected plugins (left side) doesn't match" \
"the list of plugins we found (right side):" >&2
echo "$mismatches" >&2
exit 1
fi
'';
}