[Bug 1762890] Re: build fails in multi-arch environment (missing changes file)

[Markus Ueberall]

Good catch, thanks a lot!

The command line was
`` sudo -E pbuilder build --loglevel W --compressprog zstdmt --use-network no --basetgz /opt/build/_buildimages/ubuntu-bionic-i386.tzstd --debbuildopts -sa /tmp/pbuilder.tmp/zfs-linux_0.8.4-1ubuntu10+ubuntu18.04+projektzentrisch.de+1.dsc ''

But ARCHITECTURE was indeed set to the wrong default (amd64) in ~/.pbuilderrc which is not supported by the build image in question:
`` [ -z "$ARCHITECTURE" ] && ARCHITECTURE="$(dpkg --print-architecture)" ''

(ARCHITECTURE should have either been set to the correct value (here,
i386) -- as provided by a wrapper script which constructed the command
line and initialised required environment variables in the first place
-- or not at all.)

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https://bugs.launchpad.net/bugs/1762890

Title:
  build fails in multi-arch environment (missing changes file)

Status in pbuilder package in Ubuntu:
  Fix Released

Bug description:
  I've recently switched my i386 system to amd64.  My pbuilder and
  cowbuilder chroots are still i386.  This setup fails to build when it
  could and should succeed.

  dpkg-deb: building package `gjots2' in `../gjots2_3.0.1-0rl3_all.deb'.
   dpkg-genchanges  >../gjots2_3.0.1-0rl3_i386.changes
  dpkg-genchanges: including full source code in upload
   dpkg-source --after-build gjots2-3.0.1
  dpkg-buildpackage: full upload (original source is included)
  I: copying local configuration
  E: Missing changes file: /home/rolf/pbuilder/buildplace/19548/build/gjots2_3.0.1-0rl3_amd64.changes
  I: unmounting dev/ptmx filesystem
  I: unmounting dev/pts filesystem
  I: unmounting dev/shm filesystem

  Notice how gjots2_3.0.1-0rl3_i386.changes but the amd64 version is the
  one being looked for.  This fails and thus the build fails.

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