This guide shows how to configure the brep module for serving the CI and
build2 build bot requests and how to smoke-test it.

Note that during the testing both the user and CI submission handler (executed
by the brep module) will run the build2 toolchain utilities. Thus, the user
needs to arrange the toolchain availability for her and for the user the
Apache2 process runs under. The easiest, would be to install the toolchain
into the system using, for example, the build2-install-*-a.0-stage.sh script
(can be downloaded from https://stage.build2.org/0/). If the being developed
brep module is not compatible with the staged toolchain, then installing the
development version of the toolchain may be required.

In the below instructions replace <BREP-SRC-ROOT>, <BREP-OUT-ROOT>, and <HOME>
with the actual absolute paths of the brep source, brep output, and the user
home directories. Replace <HOST> with the actual hostname of the local brep
repository instance.

Here we assume that the brep instance is already configured according to the
instructions in the INSTALL-DEV file. Now, the instance needs to additionally
be configured as the build2 build bot controller and the CI request service,
as it is described in the INSTALL file. This, in particular, requires to
specify the build-config and the number of ci-* configuration options in the
brep module configuration file. For example:

$ mkdir ~/brep
$ cd ~/brep
$ mkdir ci-data config
$ setfacl -m g:www-data:rwx ci-data
$ cd config
$ cp <BREP-SRC-ROOT>/etc/brep-module.conf .

Edit brep-module.conf:

- Uncomment the Builds=?builds menu.
- Set the build-config option as <HOME>/brep/config/buildtab.
- Set the ci-data option as <HOME>/brep/ci-data.
- Set the ci-handler option as <BREP-OUT-ROOT>/brep/handler/ci/brep-ci-load.

- Add the following options:

ci-handler-argument --result-url
ci-handler-argument http://<HOST>
ci-handler-argument <BREP-OUT-ROOT>/load/brep-load

Create the buildtab file:

$ cat <<EOF >buildtab
linux_debian_12*-gcc_13.1 linux_debian_12-gcc_13.1    x86_64-linux-gnu "all default"
linux_debian_12*-gcc_13.1 linux_debian_12-gcc_13.1-O3 x86_64-linux-gnu "all default" config.cc.coptions="-O3"
EOF

Point the brep module to the newly created configuration file:

$ sudo systemctl stop apache2

Open the corresponding Apache2 .conf file and change the brep-conf directive
to refer to <HOME>/brep/config/brep-module.conf.

$ sudo systemctl start apache2
$ sudo systemctl status apache2

Submit a package for CI, for example, foo/1.0.0:

$ cd ~/brep
$ git clone https://.../foo
$ cd foo
$ bdep init -C @cfg --
$ bdep ci --server http://<HOST>

Verify that the CI request is successfully submitted by opening the link
contained in the bdep-ci's stderr. The submitted package should be present on
the Packages page.

Send the task request query on the behalf of the build2 build bot agent, for
example:

$ cd ~/brep
$ cat <<EOF >task-request.manifest
: 1
agent: bot
toolchain-name: dev
toolchain-version: 0.17.0-a.1

:
id: a2b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
name: linux_debian_12-gcc_13.1
summary: Linux Debian 12 GCC 13.1
EOF

$ cat task-request.manifest | \
  curl -s -S --data-binary @- \
       --header 'Content-Type: text/manifest' \
       --include "http://<HOST>/?build-task"

Stash the session and result-url manifest values contained in the curl's
stdout. We will refer them as <SESSION> and <RESULT-URL> down the road.

Verify that the CI task is successfully created by clicking the 'Builds' link
in the menu of the previously opened brep page. A single package build in the
building state should be present on the Builds page.

Send the result request query on the behalf of the build2 build bot agent:

$ cat <<EOF >result-request.manifest
: 1
session: <SESSION>
agent-checksum: 1
:
name: foo
version: 1.0.0
status: success
EOF

$ cat result-request.manifest | \
  curl -s -S --data-binary @- \
       --header 'Content-Type: text/manifest' \
       --include <RESULT-URL>

Refresh the Builds page and make sure that the build is now in the built state
(the 'success' status is printed in the result field).

Re-submit the task-request.manifest file, refresh the Builds page, and make
sure that the second package build appears on the page in the building state.
Edit the session value in the result-request.manifest, re-submit it to the new
result URL, refresh the Builds page, and make sure that the latest build is
now in the built state as well.

You can also track the brep objects state transitions in the database. For
example, by executing the following query before/after each curl command:

$ psql -d brep_build -c 'select * from build_tenant'