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Thomas De Schampheleire

ssh: set a valid locale in the ssh-serve process

In the SSH client configuration, the setting 'SendEnv' could contain variables
like 'LANG', 'LC_ALL', and others. This causes these environment variables
(with their values at the client-side) to be set in the server. However, not
every locale setting valid in the client, is also valid on the server.

This could lead to the error:
'locale.Error: unsupported locale setting'
when 'from mercurial import archival, merge as hg_merge, patch, ui' is
called.

Fix this problem by providing an ini setting 'ssh_locale' that the user can
set correctly, and which will be used to set LC_ALL and LANGUAGE in the
'kallithea-cli ssh-serve' process.

If an environment variable LC_ALL is set, it takes precedence over all other
'LC_xxx' variables, as well as over LANG. So, setting LC_ALL ensures that no
user setting of 'LC_xxx' or 'LANG' could influence ssh-serve badly.

There is one environment variable that might overrule LC_ALL, specifically
for showing messages: 'LANGUAGE'. GNU gettext lets it take precedence over
LC_ALL [1]:
"GNU gettext gives preference to LANGUAGE over LC_ALL and LANG for the
purpose of message handling"

So, also set LANGUAGE to the same value as we set LC_ALL to.

The principle of setting a specific locale in the server process to fix this
error, was first proposed by Dominik Ruf.

[1] https://www.gnu.org/software/gettext/manual/html_node/The-LANGUAGE-variable.html#The-LANGUAGE-variable

#!/bin/bash
###########################################
#### THIS IS AN ARCH LINUX RC.D SCRIPT ####
###########################################

. /etc/rc.conf
. /etc/rc.d/functions

DAEMON=kallithea
APP_HOMEDIR="/srv"
APP_PATH="$APP_HOMEDIR/$DAEMON"
CONF_NAME="production.ini"
LOG_FILE="/var/log/$DAEMON.log"
PID_FILE="/run/daemons/$DAEMON"
APPL=/usr/bin/gearbox
RUN_AS="*****"

ARGS="serve --daemon \
--user=$RUN_AS \
--group=$RUN_AS \
--pid-file=$PID_FILE \
--log-file=$LOG_FILE \
-c $APP_PATH/$CONF_NAME"

[ -r /etc/conf.d/$DAEMON ] && . /etc/conf.d/$DAEMON

if [[ -r $PID_FILE ]]; then
    read -r PID < "$PID_FILE"
    if [[ $PID && ! -d /proc/$PID ]]; then
        unset PID
        rm_daemon $DAEMON
    fi
fi

case "$1" in
start)
    stat_busy "Starting $DAEMON"
    export HOME=$APP_PATH
    [ -z "$PID" ] && $APPL $ARGS &>/dev/null
    if [ $? = 0 ]; then
        add_daemon $DAEMON
        stat_done
    else
        stat_fail
        exit 1
    fi
    ;;
stop)
    stat_busy "Stopping $DAEMON"
    [ -n "$PID" ] && kill $PID &>/dev/null
    if [ $? = 0 ]; then
        rm_daemon $DAEMON
        stat_done
    else
        stat_fail
        exit 1
    fi
    ;;
restart)
    $0 stop
    sleep 1
    $0 start
    ;;
status)
    stat_busy "Checking $name status";
    ck_status $name
    ;;
*)
    echo "usage: $0 {start|stop|restart|status}"
esac