# CPack DEB Generator

The built in (binary) CPack DEB generator (Unix only)

## Variables specific to CPack Debian (DEB) generator

The CPack DEB generator may be used to create DEB package using `CPack`. The CPack DEB generator is a `CPack` generator thus it uses the `CPACK_XXX` variables used by `CPack`.

The CPack DEB generator should work on any Linux host but it will produce better deb package when Debian specific tools `dpkg-xxx` are usable on the build system.

The CPack DEB generator has specific features which are controlled by the specifics `CPACK_DEBIAN_XXX` variables.

`CPACK_DEBIAN_<COMPONENT>_XXXX` variables may be used in order to have component specific values. Note however that `<COMPONENT>` refers to the grouping name written in upper case. It may be either a component name or a component GROUP name.

Here are some CPack DEB generator wiki resources that are here for historic reasons and are no longer maintained but may still prove useful:

> - https://gitlab.kitware.com/cmake/community/-/wikis/doc/cpack/Configuration

> - https://gitlab.kitware.com/cmake/community/-/wikis/doc/cpack/PackageGenerators#deb-unix-only

List of CPack DEB generator specific variables:

`CPACK_DEB_COMPONENT_INSTALL`

  Enable component packaging for CPackDEB

  - Mandatory : NO

  - Default : OFF

  If enabled (ON) multiple packages are generated. By default a single package containing files of all components is generated.

`CPACK_DEBIAN_PACKAGE_NAME`
`CPACK_DEBIAN_<COMPONENT>_PACKAGE_NAME`

  Set Package control field (variable is automatically transformed to lower case).

  - Mandatory : YES

  - Default :

    - `CPACK_PACKAGE_NAME` for non-component based installations

    - `CPACK_DEBIAN_PACKAGE_NAME` suffixed with -<COMPONENT> for component-based installations.

  See https://www.debian.org/doc/debian-policy/ch-controlfields.html#s-f-Source

`CPACK_DEBIAN_FILE_NAME`
`CPACK_DEBIAN_<COMPONENT>_FILE_NAME`

  Package file name.

  - Mandatory : YES

  - Default : `<CPACK_PACKAGE_FILE_NAME>[-<component>].deb`

  This may be set to `DEB-DEFAULT` to allow the CPack DEB generator to generate package file name by itself in deb format:

      <PackageName>_<VersionNumber>-<DebianRevisionNumber>_<DebianArchitecture>.deb

  Alternatively provided package file name must end with either `.deb` or `.ipk` suffix.

  Note

  Preferred setting of this variable is `DEB-DEFAULT` but for backward compatibility with the CPack DEB generator in CMake prior to version 3.6 this feature is disabled by default.

  Note

  By using non default filenames duplicate names may occur. Duplicate files get overwritten and it is up to the packager to set the variables in a manner that will prevent such errors.

`CPACK_DEBIAN_PACKAGE_EPOCH`

  The Debian package epoch

  - Mandatory : No

  - Default : -

  Optional number that should be incremented when changing versioning schemas or fixing mistakes in the version numbers of older packages.

`CPACK_DEBIAN_PACKAGE_VERSION`

  The Debian package version

  - Mandatory : YES

  - Default : `CPACK_PACKAGE_VERSION`

  This variable may contain only alphanumerics (A-Za-z0-9) and the characters . + - ~ (full stop, plus, hyphen, tilde) and should start with a digit. If `CPACK_DEBIAN_PACKAGE_RELEASE` is not set then hyphens are not allowed.

  Note

  For backward compatibility with CMake 3.9 and lower a failed test of this variable’s content is not a hard error when both `CPACK_DEBIAN_PACKAGE_RELEASE` and `CPACK_DEBIAN_PACKAGE_EPOCH` variables are not set. An author warning is reported instead.

`CPACK_DEBIAN_PACKAGE_RELEASE`

  The Debian package release - Debian revision number.

  - Mandatory : No

  - Default : -

  This is the numbering of the DEB package itself, i.e. the version of the packaging and not the version of the content (see `CPACK_DEBIAN_PACKAGE_VERSION`). One may change the default value if the previous packaging was buggy and/or you want to put here a fancy Linux distro specific numbering.

`CPACK_DEBIAN_PACKAGE_ARCHITECTURE`
`CPACK_DEBIAN_<COMPONENT>_PACKAGE_ARCHITECTURE`

  The Debian package architecture

  - Mandatory : YES

  - Default : Output of `dpkg --print-architecture` (or `i386` if `dpkg` is not found)

`CPACK_DEBIAN_PACKAGE_DEPENDS`
`CPACK_DEBIAN_<COMPONENT>_PACKAGE_DEPENDS`

  Sets the Debian dependencies of this package.

  - Mandatory : NO

  - Default :

    - An empty string for non-component based installations

    - `CPACK_DEBIAN_PACKAGE_DEPENDS` for component-based installations.

  Note

  If `CPACK_DEBIAN_PACKAGE_SHLIBDEPS` or more specifically `CPACK_DEBIAN_<COMPONENT>_PACKAGE_SHLIBDEPS` is set for this component, the discovered dependencies will be appended to `CPACK_DEBIAN_<COMPONENT>_PACKAGE_DEPENDS` instead of `CPACK_DEBIAN_PACKAGE_DEPENDS`. If `CPACK_DEBIAN_<COMPONENT>_PACKAGE_DEPENDS` is an empty string, only the automatically discovered dependencies will be set for this component.

  Example:

      set(CPACK_DEBIAN_PACKAGE_DEPENDS "libc6 (>= 2.3.1-6), libc6 (< 2.4)")

`CPACK_DEBIAN_ENABLE_COMPONENT_DEPENDS`

  Sets inter component dependencies if listed with `CPACK_COMPONENT_<compName>_DEPENDS` variables.

  - Mandatory : NO

  - Default : -

`CPACK_DEBIAN_PACKAGE_MAINTAINER`

  The Debian package maintainer

  - Mandatory : YES

  - Default : `CPACK_PACKAGE_CONTACT`

`CPACK_DEBIAN_PACKAGE_DESCRIPTION`
`CPACK_DEBIAN_<COMPONENT>_DESCRIPTION`

  The Debian package description

  - Mandatory : YES

  - Default :

    - `CPACK_DEBIAN_<COMPONENT>_DESCRIPTION` (component based installers only) if set, or `CPACK_DEBIAN_PACKAGE_DESCRIPTION` if set, or

    - `CPACK_COMPONENT_<compName>_DESCRIPTION` (component based installers only) if set, or `CPACK_PACKAGE_DESCRIPTION` if set, or

    - content of the file specified in `CPACK_PACKAGE_DESCRIPTION_FILE` if set

  If after that description is not set, `CPACK_PACKAGE_DESCRIPTION_SUMMARY` going to be used if set. Otherwise, `CPACK_PACKAGE_DESCRIPTION_SUMMARY` will be added as the first line of description as defined in Debian Policy Manual.

`CPACK_DEBIAN_PACKAGE_SECTION`
`CPACK_DEBIAN_<COMPONENT>_PACKAGE_SECTION`

  Set Section control field e.g. admin, devel, doc, …

  - Mandatory : YES

  - Default : “devel”

  See https://www.debian.org/doc/debian-policy/ch-archive.html#s-subsections

`CPACK_DEBIAN_ARCHIVE_TYPE`

  The archive format used for creating the Debian package.

  - Mandatory : YES

  - Default : “gnutar”

  Possible value is:

  - gnutar

  Note

  This variable previously defaulted to the `paxr` value, but `dpkg` has never supported that tar format. For backwards compatibility the `paxr` value will be mapped to `gnutar` and a deprecation message will be emitted.

`CPACK_DEBIAN_COMPRESSION_TYPE`

  The compression used for creating the Debian package.

  - Mandatory : YES

  - Default : “gzip”

  Possible values are:

  - lzma

  - xz

  - bzip2

  - gzip

`CPACK_DEBIAN_PACKAGE_PRIORITY`
`CPACK_DEBIAN_<COMPONENT>_PACKAGE_PRIORITY`

  Set Priority control field e.g. required, important, standard, optional, extra

  - Mandatory : YES

  - Default : “optional”

  See https://www.debian.org/doc/debian-policy/ch-archive.html#s-priorities

`CPACK_DEBIAN_PACKAGE_HOMEPAGE`

  The URL of the web site for this package, preferably (when applicable) the site from which the original source can be obtained and any additional upstream documentation or information may be found.

  - Mandatory : NO

  - Default : `CMAKE_PROJECT_HOMEPAGE_URL`

  Note

  The content of this field is a simple URL without any surrounding characters such as <>.

`CPACK_DEBIAN_PACKAGE_SHLIBDEPS`
`CPACK_DEBIAN_<COMPONENT>_PACKAGE_SHLIBDEPS`

  May be set to ON in order to use `dpkg-shlibdeps` to generate better package dependency list.

  - Mandatory : NO

  - Default :

    - `CPACK_DEBIAN_PACKAGE_SHLIBDEPS` if set or

    - OFF

  Note

  You may need set `CMAKE_INSTALL_RPATH` to an appropriate value if you use this feature, because if you don’t `dpkg-shlibdeps` may fail to find your own shared libs. See https://gitlab.kitware.com/cmake/community/-/wikis/doc/cmake/RPATH-handling

`CPACK_DEBIAN_PACKAGE_DEBUG`

  May be set when invoking cpack in order to trace debug information during the CPack DEB generator run.

  - Mandatory : NO

  - Default : -

`CPACK_DEBIAN_PACKAGE_PREDEPENDS`
`CPACK_DEBIAN_<COMPONENT>_PACKAGE_PREDEPENDS`

  Sets the Pre-Depends field of the Debian package. Like `Depends`, except that it also forces `dpkg` to complete installation of the packages named before even starting the installation of the package which declares the pre-dependency.

  - Mandatory : NO

  - Default :

    - An empty string for non-component based installations

    - `CPACK_DEBIAN_PACKAGE_PREDEPENDS` for component-based installations.

  See http://www.debian.org/doc/debian-policy/ch-relationships.html#s-binarydeps

`CPACK_DEBIAN_PACKAGE_ENHANCES`
`CPACK_DEBIAN_<COMPONENT>_PACKAGE_ENHANCES`

  Sets the Enhances field of the Debian package. Similar to `Suggests` but works in the opposite direction: declares that a package can enhance the functionality of another package.

  - Mandatory : NO

  - Default :

    - An empty string for non-component based installations

    - `CPACK_DEBIAN_PACKAGE_ENHANCES` for component-based installations.

  See http://www.debian.org/doc/debian-policy/ch-relationships.html#s-binarydeps

`CPACK_DEBIAN_PACKAGE_BREAKS`
`CPACK_DEBIAN_<COMPONENT>_PACKAGE_BREAKS`

  Sets the Breaks field of the Debian package. When a binary package (P) declares that it breaks other packages (B), `dpkg` will not allow the package (P) which declares Breaks be unpacked unless the packages that will be broken (B) are deconfigured first. As long as the package (P) is configured, the previously deconfigured packages (B) cannot be reconfigured again.

  - Mandatory : NO

  - Default :

    - An empty string for non-component based installations

    - `CPACK_DEBIAN_PACKAGE_BREAKS` for component-based installations.

  See https://www.debian.org/doc/debian-policy/ch-relationships.html#s-breaks

`CPACK_DEBIAN_PACKAGE_CONFLICTS`
`CPACK_DEBIAN_<COMPONENT>_PACKAGE_CONFLICTS`

  Sets the Conflicts field of the Debian package. When one binary package declares a conflict with another using a Conflicts field, `dpkg` will not allow them to be unpacked on the system at the same time.

  - Mandatory : NO

  - Default :

    - An empty string for non-component based installations

    - `CPACK_DEBIAN_PACKAGE_CONFLICTS` for component-based installations.

  See https://www.debian.org/doc/debian-policy/ch-relationships.html#s-conflicts

  Note

  This is a stronger restriction than `Breaks`, which prevents the broken package from being configured while the breaking package is in the “Unpacked” state but allows both packages to be unpacked at the same time.

`CPACK_DEBIAN_PACKAGE_PROVIDES`
`CPACK_DEBIAN_<COMPONENT>_PACKAGE_PROVIDES`

  Sets the Provides field of the Debian package. A virtual package is one which appears in the Provides control field of another package.

  - Mandatory : NO

  - Default :

    - An empty string for non-component based installations

    - `CPACK_DEBIAN_PACKAGE_PROVIDES` for component-based installations.

  See https://www.debian.org/doc/debian-policy/ch-relationships.html#s-virtual

`CPACK_DEBIAN_PACKAGE_REPLACES`
`CPACK_DEBIAN_<COMPONENT>_PACKAGE_REPLACES`

  Sets the Replaces field of the Debian package. Packages can declare in their control file that they should overwrite files in certain other packages, or completely replace other packages.

  - Mandatory : NO

  - Default :

    - An empty string for non-component based installations

    - `CPACK_DEBIAN_PACKAGE_REPLACES` for component-based installations.

  See http://www.debian.org/doc/debian-policy/ch-relationships.html#s-binarydeps

`CPACK_DEBIAN_PACKAGE_RECOMMENDS`
`CPACK_DEBIAN_<COMPONENT>_PACKAGE_RECOMMENDS`

  Sets the Recommends field of the Debian package. Allows packages to declare a strong, but not absolute, dependency on other packages.

  - Mandatory : NO

  - Default :

    - An empty string for non-component based installations

    - `CPACK_DEBIAN_PACKAGE_RECOMMENDS` for component-based installations.

  See http://www.debian.org/doc/debian-policy/ch-relationships.html#s-binarydeps

`CPACK_DEBIAN_PACKAGE_SUGGESTS`
`CPACK_DEBIAN_<COMPONENT>_PACKAGE_SUGGESTS`

  Sets the Suggests field of the Debian package. Allows packages to declare a suggested package install grouping.

  - Mandatory : NO

  - Default :

    - An empty string for non-component based installations

    - `CPACK_DEBIAN_PACKAGE_SUGGESTS` for component-based installations.

  See http://www.debian.org/doc/debian-policy/ch-relationships.html#s-binarydeps

`CPACK_DEBIAN_PACKAGE_GENERATE_SHLIBS`

  - Mandatory : NO

  - Default : OFF

  Allows to generate shlibs control file automatically. Compatibility is defined by `CPACK_DEBIAN_PACKAGE_GENERATE_SHLIBS_POLICY` variable value.

  Note

  Libraries are only considered if they have both library name and version set. This can be done by setting SOVERSION property with `set_target_properties()` command.

`CPACK_DEBIAN_PACKAGE_GENERATE_SHLIBS_POLICY`

  Compatibility policy for auto-generated shlibs control file.

  - Mandatory : NO

  - Default : “=”

  Defines compatibility policy for auto-generated shlibs control file. Possible values: “=”, “>=”

  See https://www.debian.org/doc/debian-policy/ch-sharedlibs.html#s-sharedlibs-shlibdeps

`CPACK_DEBIAN_PACKAGE_CONTROL_EXTRA`
`CPACK_DEBIAN_<COMPONENT>_PACKAGE_CONTROL_EXTRA`

  This variable allow advanced user to add custom script to the control.tar.gz. Typical usage is for conffiles, postinst, postrm, prerm.

  - Mandatory : NO

  - Default : -

  Usage:

      set(CPACK_DEBIAN_PACKAGE_CONTROL_EXTRA
          "${CMAKE_CURRENT_SOURCE_DIR}/prerm;${CMAKE_CURRENT_SOURCE_DIR}/postrm")

  Note

  The original permissions of the files will be used in the final package unless the variable `CPACK_DEBIAN_PACKAGE_CONTROL_STRICT_PERMISSION` is set. In particular, the scripts should have the proper executable flag prior to the generation of the package.

`CPACK_DEBIAN_PACKAGE_CONTROL_STRICT_PERMISSION`
`CPACK_DEBIAN_<COMPONENT>_PACKAGE_CONTROL_STRICT_PERMISSION`

  This variable indicates if the Debian policy on control files should be strictly followed.

  - Mandatory : NO

  - Default : FALSE

  Usage:

      set(CPACK_DEBIAN_PACKAGE_CONTROL_STRICT_PERMISSION TRUE)

  Note

  This overrides the permissions on the original files, following the rules set by Debian policy https://www.debian.org/doc/debian-policy/ch-files.html#s-permissions-owners

`CPACK_DEBIAN_PACKAGE_SOURCE`
`CPACK_DEBIAN_<COMPONENT>_PACKAGE_SOURCE`

  Sets the `Source` field of the binary Debian package. When the binary package name is not the same as the source package name (in particular when several components/binaries are generated from one source) the source from which the binary has been generated should be indicated with the field `Source`.

  - Mandatory : NO

  - Default :

    - An empty string for non-component based installations

    - `CPACK_DEBIAN_PACKAGE_SOURCE` for component-based installations.

  See https://www.debian.org/doc/debian-policy/ch-controlfields.html#s-f-Source

  Note

  This value is not interpreted. It is possible to pass an optional revision number of the referenced source package as well.

## Packaging of debug information

Dbgsym packages contain debug symbols for debugging packaged binaries.

Dbgsym packaging has its own set of variables:

`CPACK_DEBIAN_DEBUGINFO_PACKAGE`
`CPACK_DEBIAN_<component>_DEBUGINFO_PACKAGE`

  Enable generation of dbgsym .ddeb package(s).

  - Mandatory : NO

  - Default : OFF

Note

Binaries must contain debug symbols before packaging so use either `Debug` or `RelWithDebInfo` for `CMAKE_BUILD_TYPE` variable value.

## Building Debian packages on Windows

To communicate UNIX file permissions from the install stage to the CPack DEB generator the “cmake_mode_t” NTFS alternate data stream (ADT) is used.

When a filesystem without ADT support is used only owner read/write permissions can be preserved.

## Reproducible packages

The environment variable `SOURCE_DATE_EPOCH` may be set to a UNIX timestamp, defined as the number of seconds, excluding leap seconds, since 01 Jan 1970 00:00:00 UTC. If set, the CPack DEB generator will use its value for timestamps in the package.