/usr/share/language-tools/set-language-helper is in accountsservice 0.6.35-0ubuntu7.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | #!/bin/sh -e
homedir=$1
language=$2
validated_language=
[ -n "$language" -a -n "$homedir" ] || exit 1
langtoolsdir=/usr/share/language-tools
validated_language=$( $langtoolsdir/language-validate $language )
if ! dpkg -l language-selector-gnome > /dev/null 2>&1; then
renewed_langlist=$validated_language
elif [ $language = "${language%:*}" ]; then
renewed_langlist=$( $langtoolsdir/update-langlist $validated_language "$homedir" )
else
# $language contains a priority list
renewed_langlist=$validated_language:${language#*:}
fi
locale_name=$( $langtoolsdir/language2locale $validated_language )
( $langtoolsdir/save-to-pam-env "$homedir" $locale_name $renewed_langlist ) || exit 1
echo $validated_language
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