Create a clean chroot for the installer.

The installer stage has a clean chroot for its own usage. The chroot
from the chroot stage is available in chroot/chroot (implemented similar
to the binary stage).

scripts/build/installer

@@ -28,6 +28,9 @@ Init_config_data "${@}"
 Setup_clean_exit
 
 if [ "${LB_BUILD_WITH_CHROOT}" = "true" ]; then
+	# Use a fresh chroot environment, to not pollute the 'normal' chroot
+	lb installer_chroot "${@}"
+
 	# Configuring chroot
 	lb chroot_prep install all mode-archives-chroot "${@}"
 fi
@@ -39,6 +42,12 @@ lb installer_preseed "${@}"
 if [ "${LB_BUILD_WITH_CHROOT}" = "true" ]; then
 	# Deconfiguring chroot
 	lb chroot_prep remove all mode-archives-chroot "${@}"
+
+	# Revert lb installer_chroot
+	mv chroot/chroot chroot.tmp
+	rm -rf chroot
+	mv chroot.tmp chroot
+	Remove_stagefile installer_chroot
 fi
 
 Echo_message "Installer stage completed"

scripts/build/installer_chroot

@@ -0,0 +1,62 @@
+#!/bin/sh
+
+## live-build(7) - System Build Scripts
+## Copyright (C) 2016-2020 The Debian Live team
+## Copyright (C) 2006-2015 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="Copy chroot into chroot"
+USAGE="${PROGRAM} [--force]"
+
+# Processing arguments and configuration files
+Init_config_data "${@}"
+
+Echo_message "Begin copying chroot for the installer..."
+
+# Requiring stage file
+Require_stagefiles config bootstrap
+
+# Checking stage file
+Check_stagefile
+
+# Acquire lock file
+Acquire_lockfile
+
+# Normally, virtual filesystems are not mounted here, but people tend to be lazy
+if [ -f chroot/proc/version ]
+then
+	umount chroot/proc
+fi
+
+if [ -d chroot/sys/kernel ]
+then
+	umount chroot/sys
+fi
+
+if [ "${LB_BUILD_WITH_CHROOT}" = "false" ]
+then
+	exit 0
+fi
+
+# Removing old chroot
+rm -rf chroot/chroot
+rm -rf chroot.tmp
+
+# Copying new chroot
+mv chroot chroot.tmp
+cp -a cache/bootstrap chroot
+touch chroot/chroot_for_installer.cache
+mv chroot.tmp chroot/chroot
+
+# Creating stage file
+Create_stagefile

scripts/build/installer_preseed

@@ -38,13 +38,13 @@ Acquire_lockfile
 
 if ls config/preseed/*.cfg > /dev/null 2>&1 || \
    ls config/preseed/*.cfg.installer > /dev/null 2>&1 || \
-   ls chroot/root/packages.installer > /dev/null 2>&1
+   ls chroot/chroot/root/packages.installer > /dev/null 2>&1
 then
 	_DIRECTORY="binary/install"
 
 	rm -f "${_DIRECTORY}/preseed.cfg"
 
-	for _FILE in config/preseed/*.cfg config/preseed/*.cfg.installer chroot/root/packages.installer
+	for _FILE in config/preseed/*.cfg config/preseed/*.cfg.installer chroot/chroot/root/packages.installer
 	do
 		if [ -e "${_FILE}" ]
 		then