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14.4.2 ‘fetch-po’ in ‘po/’
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   The ‘po/’ directory should also contain an executable shell script
named ‘fetch-po’.  It is supposed to fetch the PO files, produced by
translators, from a translations project's site on the internet, store
them in the current directory, and generate a ‘LINGUAS’ file
accordingly.  (More on that below.)

   This script does not take any arguments.

   An initial ‘fetch-po’ file can be installed by ‘gettextize’.  But you
may need to customize it.

   There are two ways of implementing the ‘fetch-po’ script:
   • In packages whose translators commit their PO files directly into
     the version control of the package, or where a translations
     project's daemon does this automatically on behalf of the
     translators, this script does not do anything.
   • In packages where the translations are collected by a translation
     project, it uses a ‘po-fetch’ invocation.  See *note Translations
     under Version Control?:: for this script's relation to version
     control, and see *note po-fetch Invocation:: for the possible
     arguments.

   This script implements the ‘Makefile’'s target ‘fetch-po’.

   This script is not contained in distribution tarballs by default,
because it is part of the maintainer's release management infrastructure
and because it may, in rare cases, contain secrets (such as API keys).