Adding Debian, Ubuntu, OpenSUSE, RHEL, CentOS kernels to WireGuard CI: Seeking URLs

[Jason A. Donenfeld]

On Fri, May 22, 2020 at 02:04:58AM -0600, Jason A. Donenfeld wrote:
> I'd like to put these on build.wireguard.com to mitigate breakage. In
> order to make this happen, I'll need two things:
> - A URL I can scape that will give me the latest kernel versions for
> relevant distros.
> - A URL I can construct using a selected version to download a boring
> kernel source tarball.
> I would prefer to not involve git, if possible, and for these URLs to
> point to the sources for actual kernels that are shipping as the
> standard latest-kernel for each of the above releases.

Here's a bash example that achieves part 1, to give a more concrete
idea of what I'm after:

    declare -A UBUNTU_SERIES_KERNELS
    while read -r line; do
        [[ $line =~ ^\ *linux\ +\|\ ([0-9.-]+)\ +\|\ ([a-z]+)(-[a-z]+)?\ +\|\ source$ ]] || continue
        version="${BASH_REMATCH[1]}" series="${BASH_REMATCH[2]}" repo="${BASH_REMATCH[3]}"
        [[ $repo != -proposed ]] || continue
        read -r smaller < <(printf '%s\n3.10\n' "$version" | sort -V)
        [[ $smaller == 3.10 ]] || continue
        UBUNTU_SERIES_KERNELS[$series]+="$version "
    done < <(curl -Ls https://people.canonical.com/~ubuntu-archive/madison.cgi?package=linux&a=&c=&s=)
    UBUNTU_KERNELS=( )
    for series in "${!UBUNTU_SERIES_KERNELS[@]}"; do
        read -r kernel < <(sort -Vur <<<"${UBUNTU_SERIES_KERNELS[$series]// /$'\n'}")
        [[ -n $kernel ]] && UBUNTU_KERNELS+=( "$kernel" )
    done
    printf -- '- %s\n' "${UBUNTU_KERNELS[@]}"

The output of this script is something like:

- 4.15.0-101.102
- 5.4.0-26.30
- 5.4.0-31.35
- 4.4.0-179.209
- 3.13.0-170.220
- 5.3.0-53.47
- 5.0.0-38.41

The next step would be turning these version numbers into URLs to the
tarballs. Hopefully the team at Canonical can assist with providing
that.

Jason