Add installation and packaging targets

[Nikhil-4595]

Gitlab Username : nikhilnl

This commit completes the mandatory CPack assignment and optional bonus tasks.

Mandatory features:

• Added full installation targets in CMake:
  • cpackexample → /bin/
  • cpackexamplelib (static/shared) → /lib/
  • public headers → /include/cpackexamplelib/
• Added cmake/CPackConfig.cmake defining:
  • package metadata (name, maintainer, vendor, homepage, description)
  • TGZ and DEB generators only
  • /usr install prefix for Debian packaging
  • automatic dependency detection (CPACK_DEBIAN_PACKAGE_SHLIBDEPS=YES)
  • stripping of binaries (CPACK_STRIP_FILES=YES)
• Verified:
  • make install installs correctly
  • make package produces *.tar.gz and *.deb packages
  • Debian package installs via apt install ./pkg.deb
  • Installed binary runs correctly from /usr/bin

Lintian:

• Resolved major issues: missing maintainer phrase, missing description, unstripped binaries, undeclared ELF dependencies.
• Remaining warnings (expected for this exercise): no changelog, no copyright, no manpage.
• Initial and final lintian reports included in this PR.

How to build and test:

1. Build the Docker image:

docker build -t cpack-exercise .

2. Manual build/test inside the container (mandatory parts):

Start container interactively:

docker run --rm -it \
  --mount type=bind,source="$(pwd)",target=/mnt/cpack-exercise \
  cpack-exercise /bin/bash

Inside the container:

cd /mnt/cpack-exercise

rm -rf build
mkdir build
cd build

cmake -DCMAKE_INSTALL_PREFIX=/tmp/cpack-install ..
make -j"$(nproc)"

make install
ls -R /tmp/cpack-install

make package
ls cpackexample-0.1.0-Linux.tar.gz
ls cpackexample_0.1.0_arm64.deb

3. Install and test the Debian package:

apt update
apt install ./cpackexample_0.1.0_arm64.deb

which cpackexample
cpackexample

4. Lintian check:

apt install -y lintian
lintian ./cpackexample_0.1.0_arm64.deb

Bonus work:

• Added CMake option CPACKEXAMPLE_BUILD_SHARED to build cpackexamplelib as a shared library.
• Extended Dockerfile to automatically:
  • configure CMake with shared library mode
  • build and package the project inside a temporary directory
  • export only the generated .tar.gz and .deb into ./packages/ on the host
  • leave no build/ directory or temporary files on the host
• Added build-and-package.sh entrypoint script.

Automated packaging command:

docker run --rm \
  --mount type=bind,source="$(pwd)",target=/mnt/cpack-exercise \
  cpack-exercise

After container exits on the host:

ls packages

Expected output:

• cpackexample_0.1.0_arm64.deb
• cpackexample-0.1.0-Linux.tar.gz

This commit completes all required tasks and implements the full optional automation workflow.