Bug#958414: Latest equivs version 2.3.0 breaks mk-build-deps

[Johannes Schauer]

Hi Otto,

On Tue, 21 Apr 2020 21:54:57 +0300 =?UTF-8?B?T3R0byBLZWvDpGzDpGluZW4=?= <otto at debian.org> wrote:
> I noticed my builds started failing today with error message:
> 
> Step 4/7 : RUN DEBIAN_FRONTEND=noninteractive mk-build-deps -r -i
> control     -t 'apt-get -y -o Debug::pkgProblemResolver=yes
> --no-install-recommends'
>  ---> Running in 912092c7ebbd
> dpkg-buildpackage: info: source package mariadb-10.5-build-deps
> dpkg-buildpackage: info: source version 1.0
> dpkg-buildpackage: info: source distribution unstable
> dpkg-buildpackage: info: source changed by root <root at 912092c7ebbd>
>  dpkg-source --before-build .
> dpkg-buildpackage: info: host architecture amd64
> dpkg-checkbuilddeps: error: Unmet build dependencies: build-essential:native
> dpkg-buildpackage: warning: build dependencies/conflicts unsatisfied; aborting
> dpkg-buildpackage: warning: (Use -d flag to override.)
> Error in the build process: exit status 3
> dpkg: error: cannot access archive
> 'mariadb-10.5-build-deps_1.0_amd64.deb': No such file or directory
> mk-build-deps: dpkg --unpack failed
> The command '/bin/sh -c DEBIAN_FRONTEND=noninteractive mk-build-deps
> -r -i control     -t 'apt-get -y -o Debug::pkgProblemResolver=yes
> --no-install-recommends'' returned a non-zero code: 2
> 
> I am pretty sure this is related to the recent equivs 2.3.0 release,
> but I have not figured out the details yet.
> 
> 
> Run the attached Dockerfile to reproduce.

could you try adding the package build-essential to the "apt-get install"
command in your Dockerfile and see if the problem persists?

I think the trivial reason for this issue is, that equivs now always uses
dpkg-buildpackage (see #880165 or commit c1f8ba) but it didn't add a dependency
on build-essential. The build-essential package is only a Recommends of
dpkg-dev and thus it is not guaranteed to be installed just by depending on
dpkg-dev.

Thanks!

cheers, josch
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