Bug#807046: pbuilder: how does name resolution work

[Ritesh Raj Sarraf]

Package: pbuilder
Version: 0.221.1
Severity: important

Hello Mattia,

To start with, this bug report is mostly a question. I'm not sure if
this is really a bug, and if so, is it warranted against pbuilder.

Currently, the way pbuilder works is that it looks into the
/etc/resolv.conf in its chroot. From it, it determines its name
resolver.

To keep things simple, for years I ran the dnsmasq caching server locally on my box.
It helped me to have a static name server, localhost, for that puprose.

If not using a caching nameserver, how are users supposed to use
pbuilder ? Are they expected to ensure valid name servers are defined ?
I can't see any way to relate the host's nameserver listing into the
chroot.


When I log into pbuilder, there are very limited mounts that pbuilder
defines. If /run as a whole was mounted, then pbuilder could have had
/etc/resolv.conf as a symlink.

rrs at learner:~$ sudo pbuilder --login
[sudo] password for rrs: 
I: Building the build Environment
I: extracting base tarball [/var/cache/pbuilder/sid-amd64-base.tgz]
I: copying local configuration
I: mounting /proc filesystem
I: mounting /run/shm filesystem
I: mounting /dev/pts filesystem
I: Mounting /var/cache/apt/archives/
I: Mounting /var/tmp/lxc/ccache
I: policy-rc.d already exists
W: no hooks of type H found -- ignoring
I: entering the shell
File extracted to: /tmp/26793

W: no hooks of type F found -- ignoring
root at learner:/# ls /run/shm/

-- System Information:
Debian Release: stretch/sid
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'unstable'), (101, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.3.0+ (SMP w/4 CPU cores; PREEMPT)
Locale: LANG=en_IN.utf8, LC_CTYPE=en_IN.utf8 (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    4.3.0-1
ii  net-tools   1.60+git20150829.73cef8a-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/nomirror:
* pbuilder/rewrite: false
  pbuilder/mirrorsite: http://ftp.debian.org/debian/