arch-setup-locale

#!/bin/sh
#
# Configure locale.
#
# Generate the default en_US.UTF-8 locale.
# In the bootstrap archive as of 2021.02.01 this is the default locale, but it has not
# been generated, so there will be some issues until this has been done!
# NOTE: Requires gzip installed, so must wait until after packages above are installed!
# NOTE: Makes sure it is not commented out in /etc/locale.gen, even if locale is currently
# enabled (has been generated), because that means it will be removed next time locales
# are regenerated (which happens automatically on glibc updates)!
#

# Verify running as root (not relying on sudo which may not be installed yet).
if [ ${EUID:-$(id -u)} -ne 0 ]; then
    echo 'Please run this script as root'
    exit 1
fi

if [ "$LANG" = "en_US.UTF-8" ]; then
    # NEW: Make sure we have an uncommented line "en_US.UTF-8 UTF-8" in /etc/locale.gen,
    # and then regenerate locale regardless if it has been done already!
    # Could use one of the following tests to detect if it has already been generated,
    # but must in any case make sure it is enabled in /etc/locale.gen because if not it
    # means it will be removed next time locales are regenerated (which happens
    # automatically on glibc updates), so could just as well just always (re-)generate.
    #   if locale --all-locales 2>/dev/null | grep --quiet --fixed-strings --line-regexp "en_US.utf8" ; then # Enabled means it must have been generated!
    #   if localedef --list-archive | grep --quiet --fixed-strings --line-regexp "en_US.utf8" ; then # Generated means it is enabled!
    # Note: There are two matches for en_US.UTF-8 UTF-8 in the default template:
    #   "#  en_US.UTF-8 UTF-8" in an example in the header comment, and "#en_US.UTF-8 UTF-8"
    #   in the complete list.
    if cat /etc/locale.gen | grep --quiet '^\s*en_US.UTF-8 UTF-8\s*$' ; then
        echo "Skipping enabling of system locale in /etc/locale.gen: en_US.UTF-8 is already enabled"
    elif cat /etc/locale.gen | grep --quiet '^\s*#\s*en_US.UTF-8 UTF-8\s*$' ; then
        echo "Enabling system locale en_US.UTF-8 in /etc/locale.gen (uncommenting)"
        # NEW: Only uncommenting the last of the (by default) two matches:
        sed --in-place "$(cat /etc/locale.gen | sed --quiet --regexp-extended '/^\s*#\s*(en_US.UTF-8 UTF-8)\s*$/=' | tail --lines=1)"' s/.*/en_US.UTF-8 UTF-8/' /etc/locale.gen
        # OLD: This will replace all (both) occurrences!
        #sed --in-place --regexp-extended 's/^\s*#\s*(en_US.UTF-8 UTF-8)\s*$/\1/' /etc/locale.gen
    else
        echo "Enabling system locale en_US.UTF-8 in /etc/locale.gen (appending)"
        echo "en_US.UTF-8 UTF-8" >> /etc/locale.gen
    fi
    locale-gen
    # OLD:
    #if locale --all-locales 2>/dev/null | grep --quiet --fixed-strings --line-regexp "en_US.utf8" ; then # Enabled means it must have been generated?
    #    if localedef --list-archive | grep --quiet --fixed-strings --line-regexp "en_US.utf8" ; then # Generated means it is enabled?
    #        echo "Enabling system locale en_US.UTF-8"
    #        # NOTE: If already added to /etc/locale.gen but locale-gen has not been executed,
    #        # this does not consider that and just adds a duplicate!
    #        #    echo "en_US.UTF-8 UTF-8" >> /etc/locale.gen
    #        # This following command will print "Generating locales...\nen_US.UTF-8... done\nGeneration complete."
    #        locale-gen
    #    else
    #        echo "Skipping enabling of system locale: en_US.UTF-8 has already been generated"
    #    fi
    #else
    #    echo "Skipping enabling of system locale: en_US.UTF-8 is already enabled"
    #fi
else
    # TODO: Could change locale as well? Set LANG in /etc/locale.conf etc..
    echo "WARNING: System locale expected to be en_US.UTF-8 but was ${LANG}"
fi