canonical / appstream.dart Goto Github PK

This can be slow, so use isolates to be non-blocking.

kp@kp-B550:~/trials/my_app$ dart run
Building package executable...
Built my_app:my_app.
Unhandled exception:
FormatException: Missing component package
#0 new AppstreamCollection.fromYaml (package:appstream/src/collection.dart:421:9)
#1 AppstreamPool._loadYamlCollection (package:appstream/src/pool.dart:45:32)

#2 Future.wait. (dart:async/future.dart)

#3 AppstreamPool.load (package:appstream/src/pool.dart:24:23)

#4 main (file:///home/kp/trials/my_app/bin/my_app.dart:5:3)

If you run the example on Ubuntu you get:

Unhandled exception:
Error on line 25023, column 3: Duplicate mapping key.
      ╷
25023 │   ca_ES:
      │   ^^^^^
      ╵
#0      Loader._loadMapping (package:yaml/src/loader.dart:168:9)

This is because appstream-generator was generating invalid YAML, specifically the translation merging was leading to duplicate keys in maps (i.e. two ca_ES translations in the above example). While this is now fixed upstream, Ubuntu/Debian releases will continue to have invalid YAML files.

Possible solutions:

• We manage to update all the existing YAML in Ubuntu/Debian - however this can't fix any systems that haven't updated.
• The Dart YAML implementation slackens its requirements on maps (seems extremely unlikely/undesirable).
• We pre-process the YAML to remove these duplicates.
• We make a small YAML decoder in appstream.dart that handles this case.

On Ubuntu 22.10 with Dart 2.18.4:

$ dart run example/example.dart 
Unhandled exception:
FileSystemException: Directory listing failed, path = '/var/lib/app-info/' (OS Error: No such file or directory, errno = 2)

Callstack:

AppstreamPool._listFiles (appstream.dart/lib/src/pool.dart:40)
<asynchronous gap> (Unknown Source:0)
AppstreamPool.load (appstream.dart/lib/src/pool.dart:21)
<asynchronous gap> (Unknown Source:0)
main (appstream.dart/example/example.dart:5)
<asynchronous gap> (Unknown Source:0)

I need the latest packagekit release for the getUpdateDetail method :) But I can't use appstream then because that one uses older deps

[software] flutter pub get
Running "flutter pub get" in software...                        
Because every version of packagekit from git depends on dbus ^0.7.6 which depends on xml ^6.1.0, every version of packagekit from git requires xml ^6.1.0.
And because every version of appstream depends on xml ^5.1.1, packagekit from git is incompatible with appstream.
So, because software depends on both appstream ^0.2.4 and packagekit from git, version solving failed.
pub get failed (1; So, because software depends on both appstream ^0.2.4 and packagekit from git, version solving failed.)
exit code 1

Would be nice if you could update the deps of appstream. Best regards

I'm running the simple example in the README that iterates on all the components in the pool and prints them.
This raises an exception, because AppstreamComponent.toString() wants to print the value of its keywords attribute, but it turns out some entries are null. This is caused by possibly invalid YAML:

[…]
  pt_BR:
  - bate-papo
  - chat
  - mensagem
  - 
  - instantânea
[…]

The YAML parser doesn't complain, but these null entries should probably be filtered out.

All collections are aggregated when calling AppstreamPool.load(), and I only have access to a flat list of components.
I can't filter on e.g. AppstreamCollection.origin (or architecture, or priority).