CCACHE_SIZE enviroment variable

[tylerjw]

It would be useful to be able to set the CCACHE_SIZE environment variable for reducing the size of the cache sometimes.

[mathias-luedtke]

At first I thought that this is a variable that ccache support directly, but I guess it has to be set explicitly.

It would be great, if you could create a PR and test it.

Instead of adding it everywhere, I would suggest a new function in workspace.sh:

function ici_setup_ccache() {
    if [ -n "$CCACHE_DIR" ]; then
        ici_run "setup_ccache" ici_apt_install ccache
        export PATH="/usr/lib/ccache:$PATH"
        if [ -n "$CCACHE_SIZE" ]; then
            ccache --set-config=max_size="$CCACHE_SIZE"
        fi
    fi
}

(not tested)

CCACHE_SIZE needs to be added in docker.env as well...

[tylerjw]

Basically the reason for wanting this feature is debug builds can create a huge ccache that can fill up storage and you get still get a large benefit by setting it to something small-ish (but still big enough for anything you are going to get a hit on) (like 500mb) so it cleans out the old stuff sooner.

I'll try to submit a PR for this soon. I'm sorry if I've been bothering you with all my issues. GitHub Actions seems to be performing much better than it did last November when I last tested it which means I am converting much of the ros-planning repos (hopefully moveit/moveit2 also) to using industrial_ci on GitHub Actions.

One thing cool I discovered tonight is I can cache entire workspaces so I'm experimenting with caching both the upstream and target workspace. Here is my current working copy of the moveit2 yaml: https://github.com/tylerjw/moveit2/blob/test-industrial-ci/.github/workflows/industrial_ci_action.yml