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Build in a offline environment

If you're stuck in a environment without internet, but you've managed to find a build machine with internet access and you want to quickly create a offline mirror. Here's how.

Prepping archiso for offline stuff.

Make the following change to build.sh (from releng):

for arch in x86_64; do
    run_once make_basefs
    ./make_offline ${work_dir} ${arch} <AUR-valid packages>
    run_once make_packages
done

That's all you need for now.
What you've done is using your build machines mirrorlist (you've probably changed it to fit your needs and location), and you've removed a unessesairy step of excessive downloading.

Bring your build machines pacman-mirrorlist

If you've optemized/added changes to your /etc/pacman.d/mirrorlist, Comment out these two lines in build.sh:

curl -o ${work_dir}/
lynx -dump -nolist

And in their place, add these two:

cp /etc/pacman.d/mirrorlist ${work_dir}/
cp /etc/pacman.conf ${work_dir}/