git_clone_trueos_src.sh

#!/bin/sh
set -xu
src_dir="/usr/src"

if test "$(id -u)" != "0"
then
    echo "Error: this script must be run as root."
    exit 1
fi

git_revision=$(uname -v | cut -d'#' -f2 | cut -d' ' -f2 | cut -d'(' -f1)
if test -z "$git_revision"
then
    echo "Error: unable to detect TrueOS git revision."
    exit 1
fi

git_branch=$(uname -v | cut -d'#' -f2 | cut -d' ' -f2 | cut -d'(' -f2 | cut -d')' -f1)
if test -z "$git_branch"
then
    echo "Error: unable to detect TrueOS git branch."
    exit 1
fi

if test -z "$(ls -A /usr/src)"
then
    mkdir -p "$src_dir"
    if ! git clone -b "$git_branch" https://github.com/trueos/freebsd "$src_dir"
    then
        exit 1
    fi
fi

if cd "$src_dir"
then
    git checkout "$git_revision"
fi
set +xu