Bug#860408: pbuilder: leaves a 0-byte tgz file if creation fails

[Lars Wirzenius]

Package: pbuilder
Version: 0.228.6
Severity: normal

When I run pbuilder to create a base tgz file, and there's an error
during the process, I'm left with a 0-byte output file. It would be
better to not create the output file unless debootstrap finished
correctly.

-- System Information:
Debian Release: 9.0
  APT prefers testing
  APT policy: (500, 'testing'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 4.9.0-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.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]  1.5.60
ii  debootstrap            1.0.89
ii  dpkg-dev               1.18.23
ii  initscripts            2.88dsf-59.9
ii  util-linux             2.29.2-1
ii  wget                   1.18-5

Versions of packages pbuilder recommends:
ii  devscripts  2.17.5
ii  eatmydata   105-5
ii  fakeroot    1.21-3.1
ii  iproute2    4.9.0-1
ii  net-tools   1.60+git20161116.90da8a0-1
ii  sudo        1.8.19p1-1

Versions of packages pbuilder suggests:
pn  cowdancer   <none>
ii  gdebi-core  0.9.5.7+nmu1

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