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# Crossbuild

## Summary

The "crossbuild" system is a way to build FreeRADIUS for multiple
different operating systems, using Docker.

The primary purpose is for developers to easily test FreeRADIUS on
different systems.


## Common Usage

The systems supported can be listed with

    make crossbuild.info

A reminder of the make targets may be seen with

    make crossbuild.help

To make all the known systems (this may take quite a while, at
least on the first run):

    make crossbuild

or for the most common systems (Debian, Ubuntu, CentOS):

    make crossbuild.common


## General operation

The system works by building and then starting up Docker
containers for the systems. When a build is triggered (either
generally, as above, or for a specific OS) the current git commits
are copied into the image and then `make test` run.

The Docker containers are left running, and may be stopped with

    make crossbuild.down

The system tries to be as efficient as possible, so will not
rebuild from scratch every time.


## Global make targets

The following targets will operate on the crossbuild system
globally, or on all images (unless otherwise stated):


### `make crossbuild`

Create all docker images (if required), start them, build and test
FreeRADIUS.


### `make crossbuild.common`

As `make crossbuild`, but only build and test the most common
systems.


### `make crossbuild.info`

List all systems, together with the expected state. See
`crossbuild.reset`.


### `make crossbuild.down`

Stop all containers.


### `make crossbuild.reset`

If containers are stopped or started outside Docker, crossbuild
may get confused. This will clear the internal state which should
try and start everything from be beginning again.


### `make crossbuild.clean`

Bring down all containers, clear state. This is a general "tidy
up".


### `make crossbuild.wipe`

Don't just stop, but destroy all crossbuild docker images. This
will mean they need to be recreated again upon next use.


## Per-image make targets

The following make targets may be used on a per-image basis:

 * `make crossbuild.IMAGE`:         build and test image
 * `make crossbuild.IMAGE.log`:     show latest build log
 * `make crossbuild.IMAGE.up`:      start container
 * `make crossbuild.IMAGE.down`:    stop container
 * `make crossbuild.IMAGE.sh`:      shell in container
 * `make crossbuild.IMAGE.refresh`: push latest commits into container
 * `make crossbuild.IMAGE.clean`:   stop container and tidy up
 * `make crossbuild.IMAGE.wipe`:    remove Docker image

For example, `make crossbuild.debian10` to create, build and test
FreeRADIUS on Debian 10. `make crossbuild.debian10.down` will then
stop the container.


## Docker image and container names

Docker images will be created with names in the form:

    freeradius-build/debian10

whil containers will have names like:

    fr-crossbuild-debian10