[Bug 1859010] Re: MAILPROG binary '/usr/sbin/sendmail' does not exist or is not executable

[Colin Watson]

This seems to be partially non-deterministic, which explains why Brian
couldn't reproduce it.  Firstly, you'll need to have $mailto set in
.sbuildrc.  After that, Sbuild::ConfBase::read generates an
initialisation script that sets keys in the order returned by
$conf->get_keys(), which is keys(%{$self->{'KEYS'}}) so depends on hash
iteration order.  You'll only hit this if MAILTO is set before MAILPROG.

libsbuild-perl now only declares "Suggests: default-mta | mail-
transport-agent" while it used to declare "Recommends: exim4 | mail-
transport-agent", so I think the intent is for this to be optional
unless you've set $mailto, which doesn't seem entirely unreasonable.
The main bug here seems to be the non-determinism, which makes the
behaviour extremely confusing.

** Changed in: sbuild (Ubuntu)
       Status: Expired => Triaged

** Changed in: sbuild (Ubuntu Focal)
       Status: Expired => Triaged

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https://bugs.launchpad.net/bugs/1859010

Title:
  MAILPROG binary '/usr/sbin/sendmail' does not exist or is not
  executable

Status in sbuild package in Ubuntu:
  Triaged
Status in sbuild source package in Focal:
  Triaged

Bug description:
  [Release info]
  sb_release -a
  No LSB modules are available.
  Distributor ID:	Ubuntu
  Description:	Ubuntu Focal Fossa (development branch)
  Release:	20.04
  Codename:	focal

  [Issue/BUG?]
  While build anything in a schroot, sbuild fails because sendmail is not installed

  [Scenario]
  I'm having this issue in Focal when trying to build anything in a schroot env. 
  Even if I try to see sbuild version the error happens:

  sbuild --version
  Error reading configuration: MAILPROG binary '/usr/sbin/sendmail' does not exist or is not executable at /usr/share/perl5/Sbuild/ConfBase.pm line 59.

  Here is while trying to build pkg:

  sbuild command is: /usr/bin/sbuild --chroot-setup-commands /tmp/umt-gcedvijf --no-apt-update --no-apt-upgrade --no-apt-distupgrade -d precise-esm-amd64 -A --build-dep-resolver=aptitude php5_5.3.10-1ubuntu3.41.dsc
  Error reading configuration: MAILPROG binary '/usr/sbin/sendmail' does not exist or is not executable at /usr/share/perl5/Sbuild/ConfBase.pm line 59.

  [Fix/Workround]
  Problem can be fixed/workrounded installing sendmail in the host machine, but it's weirdo that sbuild needs sendmail, and if so, why?

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