The locales-launch launcher: Fix Glibc locales in the snap runtime

doc
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This launcher fixes Glibc locales support and allows snapped application to work properly in a non-English locale.

How to use

Merge the following snapcraft part recipe:

  # Stage snap for fixing the Glibc locales
  # https://forum.snapcraft.io/t/the-locales-launch-stage-snap/10296
  locales-launch:
    source: https://github.com/brlin-tw/locales-launch.git
    source-tag: v1.0.0
    plugin: dump
    stage-packages:
      # For localedef(1)
      - libc-bin

      # For locale data used by localedef(1)
      - locales

      # All pre-generated locale data
      # DISABLED: Lots of duplicate data will be included in snap when this is staged, unless the target machine has no resource to generate them in runtime otherwise not using it
      #
      #   Lack of compiled locales breaks gettext based localisation - snapcraft - snapcraft.io
      #   https://forum.snapcraft.io/t/lack-of-compiled-locales-breaks-gettext-based-localisation/3758
      #
      #- locales-all

    stage:
      - bin/locales-launch
      - etc/locale.alias
      - usr/bin/localedef
      - usr/share/doc/locales
      - usr/share/i18n
      - usr/share/locale

In the apps stanza, insert bin/locales-launch into the command chain:

apps:
  _app_name_:
    # The command to run the application, the value should be a *relative path* to an executable file rooted from the `prime` directory
    command: bin/locales-launch "${SNAP}"/bin/_app_command_

if you’re using the full adapter:

apps:
  _app_name_:
    # The environment adapter style to use, `command-chain` is only supported
    adapter: full

    # The command to run the application, the value should be a *relative path* to an executable file rooted from the `prime` directory
    command: bin/_app_command_
    command-chain:
      - bin/locales-launch

Snaps that use this launcher

The implementation

Lin-Buo-Ren/locales-launch-snap: A stage snap that fixes Glibc locales support

Happy snapcrafting!

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This launcher has dropped the stage snap design for convenience of version pinning, the stage snap will still work but please update your snapcraft.yaml for the current implementation, thank you!