[Bug 1647868] [NEW] CPack DEB generator shlibdeps fails silently if /usr/bin/file is not installed

[Henning Meyer]

Public bug reported:

I use CPack to build a debian package

I use CPACK_DEBIAN_PACKAGE_SHLIBDEPS to let dpkg-shlibdeps figure out
shared library dependencies

this only works when the package "file" is installed and fails silently
otherwise

"file" is not a package dependency of the cmake package

this bug report is about the packaging dependency, not that cpack
silently fails, which should be fixed upstream

How to reproduce

Source File: main.cxx

#include <iostream>
int main(int,char**) {
std::cout << "Hello\n";
return 0;
}

CMakeList.txt:
cmake_minimum_required(VERSION 2.6)
 
PROJECT(Hello)
 
ADD_EXECUTABLE(hello main.cxx)
INSTALL(TARGETS hello DESTINATION hello)
 
SET(CPACK_GENERATOR "DEB")
SET(CPACK_DEBIAN_PACKAGE_MAINTAINER "Hello Kitty") #required
SET(CPACK_DEBIAN_PACKAGE_SHLIBDEPS ON) 
INCLUDE(CPack)


commands to trigger
apt install cmake
cmake .
make package
dpkg -I Hello-0.1.1-Linux.deb | grep Depends

expected output:
Depends: libc6 (>= 2.2.5), libstdc++6 (>= 4.1.1)

actual output of grep if /usr/bin/file is not installed is empty
(missing Depends line)

affects Ubuntu version: Ubuntu 16.04 (probably all others too)
affects cmake version: 3.5.1-1ubuntu1

Work-around: apt install file (almost everyone has that installed, but
minimal docker containers for package building do not)

suggested solution: make the cmake package depend on the file package

** Affects: cmake (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1647868

Title:
  CPack DEB generator shlibdeps fails silently if /usr/bin/file is not
  installed

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