[CMake] Porting to CMAKE and utilizing the CPack

[Matthew Keeler]

Installing arbitrary files is accomplished by adding install commands into your CMakeLists. The documentation for the command is here: https://cmake.org/cmake/help/v3.3/command/install.html

For something like an init script or systemd unit file they are going to live outside the normal installation prefix. So you will need to do something like the following:

if (IS_DIRECTORY /usr/lib/systemd/system)
    install(FILES myprog.service DESTINATION /usr/lib/systemd/system)
else()
    install(FILES myprog DESTINATION /etc/init.d)
endif()

That code block will install the myprog.service file into /usr/lib/systemd/system if that directory exists and if not will install the myprog file (init script) int /etc/init.d

I have found that checking if the usual systemd directory exists is sufficient to determine that systemd is present on the build system. If you are compiling on one debian version but want to support multiple versions then you will most likely install your init script and systemd files into some place specific to your application and use a post install script to detect which version should get installed. This will however bypass the package manager for installing these and thus if the package is removed/altered dpkg wont handle anything for you regarding these files.

Check out the CpackDeb documentation for all the various variables that can be set to alter how the package builds and installs: https://cmake.org/cmake/help/v3.3/module/CPackDeb.html
In particular if you need to have postinstall scripts then you will want to set the variable CPACK_DEBIAN_PACKAGE_CONTROL_EXTRA
--
Matt Keeler


On November 12, 2015 at 07:37:14, Šimon Tóth (toth at fi.muni.cz<mailto:toth at fi.muni.cz>) wrote:

I have managed to port my SW to CMake fine, but now I'm running into
issues with the CPack package generation (debian packages for now).

I'm using the "dh_xxxx" commands in the package generation for debian.
What would be the equivalent in CMake? In particular, installing cron
scripts, init.d scripts and systemd service files.

Also is there a way to detect the presence systemd (and install systemd
service file if this is the case, init.d script otherwise)?

--
RNDr. Šimon Tóth
FI at MU (toth at fi.muni.cz) | CESNET (simon at cesnet.cz)
--

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