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Bug#837185: debootstrap: fails with `dpkg-deb` and busybox' `tar`

Package: debootstrap
Version: 1.0.82
Severity: minor

While testing other changes, I noticed that debootstrap fails when
using `dpkg-deb` together with busybox' `tar` implementation as
`dpkg-deb -f` passes additional options to `tar`.

I'm not sure if this happens in the real world (i.e. anyone has
`dpkg-deb` available, but busybox' tar instead of GNU's tar), but the
attached patch avoids the problem by calling the installed `dpkg-deb`
in the second stage.

(The patch should go in after the ones from #810301.)


-- System Information:
Debian Release: stretch/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'stable-updates'), (500, 'testing'), (500, 'stable'), (300, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 4.6.0-1-amd64 (SMP w/8 CPU cores)
Locale: LANG=C.UTF-8, LC_CTYPE=C.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages debootstrap depends on:
ii  wget  1.18-2+b1

Versions of packages debootstrap recommends:
ii  debian-archive-keyring  2014.3
ii  gnupg                   2.1.14-5

debootstrap suggests no packages.

-- no debconf information
>From 316ba08b931e6f226b25c396b45b6add58b578e2 Mon Sep 17 00:00:00 2001
From: Ansgar Burchardt <ansgar@debian.org>
Date: Fri, 9 Sep 2016 23:03:23 +0200
Subject: [PATCH] Feign install of dpkg in second stage

Using the `dpkg-deb` extractor, or more precise `dpkg-deb -f`, together
with busybox' `tar` results in failure: `dpkg-deb` passes additional
options to `tar` that are not understood by busybox' implementation such
as `--warning=no-timestamp`.

We can avoid this by feigning the installation of `dpkg` in the second
stage. Here it is possible to call the installed `dpkg-deb` together
with the installed (GNU) `tar`.
 scripts/sid | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/scripts/sid b/scripts/sid
index 428c676..ceedd66 100644
--- a/scripts/sid
+++ b/scripts/sid
@@ -59,11 +59,15 @@ first_stage_install () {
+second_stage_install () {
+	setup_dynamic_devices
 	x_feign_install () {
 		local pkg="$1"
 		local deb="$(debfor $pkg)"
-		local ver="$(extract_deb_field "$TARGET/$deb" Version)"
+		local ver="$(in_target dpkg-deb -f "$deb" Version)"
 		mkdir -p "$TARGET/var/lib/dpkg/info"
@@ -77,10 +81,6 @@ Status: install ok installed" >> "$TARGET/var/lib/dpkg/status"
 	x_feign_install dpkg
-second_stage_install () {
-	setup_dynamic_devices
 	x_core_install () {
 		smallyes '' | in_target dpkg --force-depends --install $(debfor "$@")

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