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|
#!/bin/sh
# This is a shell library to interface to the Debian configuration management
# system.
###############################################################################
# Initialization.
_DEBCONF_IMPL=
if [ "${DEBCONF_USE_CDEBCONF:-}" ]; then
# Use cdebconf if explicitly requested.
_DEBCONF_IMPL=cdebconf
elif [ -x /usr/share/debconf/frontend ] && \
[ ! -h /usr/share/debconf/frontend ]; then
# Fall back to debconf, but only if installed. (cdebconf currently
# installs /usr/share/debconf/frontend as a symlink to
# /usr/lib/cdebconf/debconf.)
_DEBCONF_IMPL=debconf
else
# Last resort: use cdebconf although not explicitly requested.
_DEBCONF_IMPL=cdebconf
fi
# Check to see if a FrontEnd is running.
if [ ! "${DEBIAN_HAS_FRONTEND:-}" ]; then
# Since there is no FrontEnd, this program execs a FrontEnd.
# It will then run a new copy of $0 that can talk to it.
if [ "$_DEBCONF_IMPL" = cdebconf ]; then
exec /usr/lib/cdebconf/debconf -- $0 "$@"
else
export PERL_DL_NONLAZY=1
exec /usr/share/debconf/frontend $0 "$@"
fi
fi
# Only do this once.
if [ -z "${DEBCONF_REDIR:-}" ]; then
# Redirect standard output to standard error. This prevents common
# mistakes by making all the output of the postinst or whatever
# script is using this library not be parsed as confmodule commands.
#
# To actually send something to standard output, send it to fd 3.
exec 3>&1
if [ "$_DEBCONF_IMPL" = cdebconf ]; then
exec 1>&5
else
exec 1>&2
fi
DEBCONF_REDIR=1
export DEBCONF_REDIR
fi
# In cdebconf, the original stdin/stdout/stderr fds are duplicated onto fds
# DEBCONF_OLD_FD_BASE to DEBCONF_OLD_FD_BASE + 2. These values are exported
# so that you can get the original fds back. This is kind of a hack:
# ideally, we might use something like a socket for the debconf protocol
# instead of stdio.
DEBCONF_OLD_FD_BASE='4'
export DEBCONF_OLD_FD_BASE
###############################################################################
# Commands.
_db_cmd () {
local _db_internal_IFS="$IFS"
IFS=' '
printf '%s\n' "$*" >&3
# Set to newline to get whole line.
IFS='
'
read -r _db_internal_line
IFS="$_db_internal_IFS"
# Disgusting, but it's the only good way to split the line,
# preserving all other whitespace.
RET="${_db_internal_line#[! ][ ]}"
local _db_status="${_db_internal_line%%[ ]*}"
case "$_db_status" in
1) # escaped data
if [ "$_DEBCONF_IMPL" = cdebconf ]; then
_DEBCONF_ESCAPE=/usr/lib/cdebconf/debconf-escape
else
_DEBCONF_ESCAPE=debconf-escape
fi
RET="$(printf '%s' "$RET" | $_DEBCONF_ESCAPE -u)"
return 0
;;
esac
return "$_db_status"
}
db_beginblock () { _db_cmd "BEGINBLOCK" "$@"; }
db_capb () { _db_cmd "CAPB" "$@"; }
db_clear () { _db_cmd "CLEAR" "$@"; }
db_data () { _db_cmd "DATA" "$@"; }
db_endblock () { _db_cmd "ENDBLOCK" "$@"; }
db_fget () { _db_cmd "FGET" "$@"; }
db_fset () { _db_cmd "FSET" "$@"; }
db_get () { _db_cmd "GET" "$@"; }
db_go () { _db_cmd "GO" "$@"; }
db_info () { _db_cmd "INFO" "$@"; }
db_input () { _db_cmd "INPUT" "$@"; }
db_metaget () { _db_cmd "METAGET" "$@"; }
db_progress () { _db_cmd "PROGRESS" "$@"; }
db_purge () { _db_cmd "PURGE" "$@"; }
db_register () { _db_cmd "REGISTER" "$@"; }
db_reset () { _db_cmd "RESET" "$@"; }
db_set () { _db_cmd "SET" "$@"; }
db_settitle () { _db_cmd "SETTITLE" "$@"; }
db_subst () { _db_cmd "SUBST" "$@"; }
db_title () { _db_cmd "TITLE" "$@"; }
db_unregister () { _db_cmd "UNREGISTER" "$@"; }
db_version () { _db_cmd "VERSION" "$@"; }
db_x_loadtemplatefile () { _db_cmd "X_LOADTEMPLATEFILE" "$@"; }
# An old alias for input.
db_text () {
db_input "$@"
}
# Cannot read a return code, since there is none and it would block.
db_stop () {
echo STOP >&3
}
|
