[Pkg-libvirt-maintainers] Bug#842452: FTBFS depdnding on docs/apibuild.py timestamp (api docs not buildable)

[Ian Jackson]

Package: libvirt
Version: 2.3.0-3
Severity: serious

I have discovered that libvirt sometimes doesn't build, depending on
the file timestamps.  Specifically: the api docs don't build; but,
whether they are rebuilt depends on timestamps and a simple "apt-get
source" generates timestamps which do not cause a docs build.

The built docs in the source package (which I think are probably also
shipped in the binaries) are evidently not actually buildable from the
provided inputs.  And it is just luck that the source package builds
for most people.

Steps to reproduce:

In a sid chroot with the build-deps installed:

  $ mkdir repro
  $ cd repro
  $ apt-get source libvirt
  Reading package lists... Done
  NOTICE: 'libvirt' packaging is maintained in the 'Git' version control system at:
  https://anonscm.debian.org/git/pkg-libvirt/libvirt.git
  Please use:
  git clone https://anonscm.debian.org/git/pkg-libvirt/libvirt.git
  to retrieve the latest (possibly unreleased) updates to the package.
  Need to get 13.3 MB of source archives.
  Get:1 http://ftp.debian.org/debian sid/main libvirt 2.3.0-3 (dsc) [3779 B]
  Get:2 http://ftp.debian.org/debian sid/main libvirt 2.3.0-3 (tar) [13.2 MB]
  Get:3 http://ftp.debian.org/debian sid/main libvirt 2.3.0-3 (diff) [56.1 kB]
  Fetched 13.3 MB in 0s (93.4 MB/s) 
  gpgv: unknown type of key resource 'trustedkeys.kbx'
  gpgv: keyblock resource '/home/ian/.gnupg/trustedkeys.kbx': General error
  gpgv: Signature made Sun Oct 16 16:00:16 2016 UTC
  gpgv:                using RSA key 07B8B7B0EA98120B
  gpgv: Can't check signature: No public key
  dpkg-source: warning: failed to verify signature on ./libvirt_2.3.0-3.dsc
  dpkg-source: info: extracting libvirt in libvirt-2.3.0
  dpkg-source: info: unpacking libvirt_2.3.0.orig.tar.xz
  dpkg-source: info: unpacking libvirt_2.3.0-3.debian.tar.xz
  dpkg-source: info: applying debian/remove-RHism.diff.patch
  dpkg-source: info: applying debian/Don-t-enable-default-network-on-boot.patch
  dpkg-source: info: applying debian/fix-Debian-specific-path-to-hvm-loader.patch
  dpkg-source: info: applying debian/Debianize-libvirt-guests.patch
  dpkg-source: info: applying patch-qemuMonitorTextGetMigrationStatus-to-intercept.patch
  dpkg-source: info: applying Disable-gnulib-s-test-nonplocking-pipe.sh.patch
  dpkg-source: info: applying Reduce-udevadm-settle-timeout-to-10-seconds.patch
  dpkg-source: info: applying debian/Debianize-systemd-service-files.patch
  dpkg-source: info: applying Allow-xen-toolstack-to-find-it-s-binaries.patch
  dpkg-source: info: applying Skip-vircgrouptest.patch
  dpkg-source: info: applying debian/Debianize-virtlockd.patch
  dpkg-source: info: applying debian/Use-upstreams-polkit-rule.patch
  dpkg-source: info: applying Allow-access-to-libnl-3-config-files.patch
  dpkg-source: info: applying debian/apparmor_profiles_local_include.patch
  dpkg-source: info: applying virt-aa-helper-apparmor-allow-usr-share-OVMF-too.patch
  dpkg-source: info: applying Set-defaults-for-zfs-tools.patch
  dpkg-source: info: applying libvirt-guests-use-wants-instead-of-requires.patch
  $ cd libvirt-2.3.0/
  $ touch docs/apibuild.py
  $ dpkg-buildpackage -uc -b >../log 2>&1
  $ 

Expected behavour: successful build.

Observed behaviour: failed build, with error messages like:

  function virTypedParamsGetUInt from /volatile/ian/Weird-libvirt-failure/repro/libvirt-2.3.0/docs/../include/libvirt/libvirt-common.h redeclared in /volatile/ian/Weird-libvirt-failure/repro/libvirt-2.3.0/de
bian/build/docs/../include/libvirt/libvirt-common.h

Log attached.

Thanks for your attention and sorry to be the bearer of bad tidings.

Regards,
Ian.

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