Bug#806386: pbuilder: No more updates /etc/resolv.conf inside the chroot, hence no more DNS inside chroot after network change

[Axel Beckert]

Package: pbuilder
Version: 0.221
Version: 0.221.1
Severity: grave
Justification: Renders package unusable on mobile devices

Since at least 0.221 (and including 0.221.1), possibly also already with
0.220, /etc/resolv.conf is no more updated inside the chroot, hence no
more DNS inside chroot after a location change which implied different
DNS servers, e.g. when having pbuilder installed on a laptop which
connects to differnt networks between two "pbuilder update" runs:

# pbuilder update --autocleanaptcache
W: /root/.pbuilderrc does not exist
I: Current time: Thu Nov 26 22:35:38 CET 2015
I: pbuilder-time-stamp: 1448573738
I: Building the build Environment
I: extracting base tarball [/var/cache/pbuilder/sid/base.tgz]
I: copying local configuration
I: mounting /proc filesystem
I: mounting /run/shm filesystem
I: mounting /dev/pts filesystem
I: policy-rc.d already exists
W: Could not create compatibility symlink because /tmp/buildd is not empty
W: no hooks of type H found -- ignoring
I: Refreshing the base.tgz
I: upgrading packages
Err http://debian.ethz.ch sid InRelease
  
Err http://debian.ethz.ch sid Release.gpg
  Could not resolve 'debian.ethz.ch'
Reading package lists...
W: Failed to fetch http://debian.ethz.ch/debian/dists/sid/InRelease  

W: Failed to fetch http://debian.ethz.ch/debian/dists/sid/Release.gpg  Could not resolve 'debian.ethz.ch'

W: Some index files failed to download. They have been ignored, or old ones used instead.
I: Obtaining the cached apt archive contents
Reading package lists...
Building dependency tree...
Reading state information...
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Reading package lists...
Building dependency tree...
Reading state information...
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Reading package lists...
Building dependency tree...
Reading state information...
Package 'ccache' is not installed, so not removed
Package 'debdelta' is not installed, so not removed
aptitude is already the newest version.
build-essential is already the newest version.
dpkg-dev is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
I: Copying back the cached apt archive contents
I: Cleaning the cached apt archive
Reading package lists... Done
Building dependency tree       
Reading state information... Done
W: no hooks of type E found -- ignoring
I: unmounting dev/pts filesystem
I: unmounting run/shm filesystem
I: unmounting proc filesystem
I: creating base tarball [/var/cache/pbuilder/sid/base.tgz]
I: cleaning the build env 
I: removing directory /var/cache/pbuilder/build/18309 and its subdirectories

This makes the package practically unusable on at least mobile devices.

Workaround:

shell1 # pbuilder login  --save-after-login
shell2 # cp -pv /etc/resolv.conf /var/cache/pbuilder/build/*/etc/resolv.conf
shell1 # exit

P.S.: Feel free to reassign in case any other package has caused this
breakage. I just know that it wasn't network-manager as the 1.0.8-1
update came _after_ this happened.

-- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (990, 'unstable'), (600, 'testing'), (111, 'buildd-unstable'), (111, 'buildd-experimental'), (110, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 4.3.0-rc5-amd64 (SMP w/4 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 pbuilder depends on:
ii  debconf [debconf-2.0]  1.5.58
ii  debootstrap            1.0.75
ii  dpkg-dev               1.18.3
ii  wget                   1.17-1

Versions of packages pbuilder recommends:
ii  devscripts         2.15.9
ii  fakeroot           1.20.2-1
ii  iproute2           4.1.1-1
ii  net-tools          1.60+git20150829.73cef8a-2
ii  pseudo [fakeroot]  1.7.4-2
ii  sudo               1.8.12-1

Versions of packages pbuilder suggests:
ii  cowdancer     0.75
ii  gdebi-core    0.9.5.7
pn  pbuilder-uml  <none>

-- debconf information:
  pbuilder/rewrite: false
  pbuilder/nomirror:
  pbuilder/mirrorsite: http://ftp.ch.debian.org/debian/