I've just upload an NMU with this patch applied. Here's the debdiff.
-- Steve McIntyre, Cambridge, UK. st...@einval.com "Arguing that you don't care about the right to privacy because you have nothing to hide is no different than saying you don't care about free speech because you have nothing to say." -- Edward Snowden
diff -Nru vmdebootstrap-1.7/debian/changelog vmdebootstrap-1.7/debian/changelog --- vmdebootstrap-1.7/debian/changelog 2016-09-11 15:07:37.000000000 +0000 +++ vmdebootstrap-1.7/debian/changelog 2017-07-19 13:39:21.000000000 +0000 @@ -1,3 +1,9 @@ +vmdebootstrap (1.7-1+nmu1) unstable; urgency=medium + + * Add tweaks used for official debian-live builds. Closes: #861069 + + -- Steve McIntyre <93...@debian.org> Wed, 19 Jul 2017 14:39:22 +0100 + vmdebootstrap (1.7-1) unstable; urgency=medium * New maintainer: Lars Wirzenius replaces Neil Williams. diff -Nru vmdebootstrap-1.7/debian/patches/customise-tweaks-debian-live.patch vmdebootstrap-1.7/debian/patches/customise-tweaks-debian-live.patch --- vmdebootstrap-1.7/debian/patches/customise-tweaks-debian-live.patch 1970-01-01 00:00:00.000000000 +0000 +++ vmdebootstrap-1.7/debian/patches/customise-tweaks-debian-live.patch 2017-07-19 13:39:22.000000000 +0000 @@ -0,0 +1,25 @@ + * Add tweaks used for official debian-live builds. Closes: #861069 +Author: Steve McIntyre <93...@debian.org> +Bug-Debian: https://bugs.debian.org/861069 +Last-Update: 2017-07-19 + +--- vmdebootstrap-1.7.orig/common/customise.lib ++++ vmdebootstrap-1.7/common/customise.lib +@@ -30,6 +30,7 @@ EXTRA_PACKAGES="dkms locales whois telne + ethtool ftp host lsof debian-faq debian-installer-launcher doc-debian \ + " + cleanup() { ++ umount ${rootdir}/proc/sys/fs/binfmt_misc > /dev/null 2>&1 || true + umount ${rootdir}/proc + umount ${rootdir}/sys + } +@@ -59,7 +60,8 @@ prepare_apt_source() { + # handle the apt source + mv ${rootdir}/etc/apt/sources.list.d/base.list ${rootdir}/etc/apt/ + echo "deb $1 $2 main contrib non-free" > ${rootdir}/etc/apt/sources.list +- chroot ${rootdir} apt update ++ echo "deb-src $1 $2 main contrib non-free" >> ${rootdir}/etc/apt/sources.list ++ chroot ${rootdir} apt -qq -y update > /dev/null 2>&1 + } + + remove_daemon_block() { diff -Nru vmdebootstrap-1.7/debian/patches/series vmdebootstrap-1.7/debian/patches/series --- vmdebootstrap-1.7/debian/patches/series 1970-01-01 00:00:00.000000000 +0000 +++ vmdebootstrap-1.7/debian/patches/series 2017-07-19 13:39:22.000000000 +0000 @@ -0,0 +1 @@ +customise-tweaks-debian-live.patch