/usr/lib/live/build/chroot_resolv is in live-build 4.0.3-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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## live-build(7) - System Build Scripts
## Copyright (C) 2006-2014 Daniel Baumann <mail@daniel-baumann.ch>
##
## This program comes with ABSOLUTELY NO WARRANTY; for details see COPYING.
## This is free software, and you are welcome to redistribute it
## under certain conditions; see COPYING for details.
set -e
# Including common functions
[ -e "${LIVE_BUILD}/scripts/build.sh" ] && . "${LIVE_BUILD}/scripts/build.sh" || . /usr/lib/live/build.sh
# Setting static variables
DESCRIPTION="$(Echo 'manage /etc/resolv.conf')"
HELP=""
USAGE="${PROGRAM} {install|remove} [--force]"
Arguments "${@}"
# Reading configuration files
Read_conffiles config/all config/common config/bootstrap config/chroot config/binary config/source
Set_defaults
# Requiring stage file
Require_stagefile .build/config .build/bootstrap
case "${1}" in
install)
Echo_message "Configuring file /etc/resolv.conf"
# Checking stage file
Check_stagefile .build/chroot_resolv
# Checking lock file
Check_lockfile .lock
# Creating lock file
Create_lockfile .lock
if [ -e chroot/etc/resolv.conf ]
then
# Save resolv file or symlink
mv chroot/etc/resolv.conf chroot/etc/resolv.conf.orig
# Also truncate it, otherwise we'll end up with the one
# created by debootstrap in the final image.
#
# If you want to have a custom resolv.conf, please
# overwrite it with normal local_includes mechanism.
Truncate chroot/etc/resolv.conf.orig
elif [ -L chroot/etc/resolv.conf ]
then
# Move resolv.conf aside if it's a symlink (likely resolvconf)
mv chroot/etc/resolv.conf chroot/etc/resolv.conf.orig
fi
if [ -f /etc/resolv.conf ]
then
# Copy resolv file
cp /etc/resolv.conf chroot/etc/resolv.conf
fi
# Creating stage file
Create_stagefile .build/chroot_resolv
;;
remove)
Echo_message "Deconfiguring file /etc/resolv.conf"
# Checking lock file
Check_lockfile .lock
# Creating lock file
Create_lockfile .lock
if [ -e config/includes.chroot/etc/resolv.conf ]
then
# Copying local resolv.conf
cp -a config/includes.chroot/etc/resolv.conf chroot/etc/resolv.conf
rm -f chroot/etc/resolv.conf.orig
elif [ -e chroot/etc/resolv.conf.orig ] || [ -L chroot/etc/resolv.conf.orig ]
then
# Restoring resolv file or symlink
mv chroot/etc/resolv.conf.orig chroot/etc/resolv.conf
else
# Truncating resolv file
Truncate chroot/etc/resolv.conf
fi
# Clean up resolvconf's pollution
if [ -e chroot/etc/resolvconf/resolv.conf.d ]
then
rm -f chroot/etc/resolvconf/resolv.conf.d/original
rm -f chroot/etc/resolvconf/resolv.conf.d/tail
fi
# Removing stage file
rm -f .build/chroot_resolv
;;
*)
Usage
;;
esac
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