builder/makepkg-overlay

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#!/usr/bin/env bash
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# Depends on lxf
shopt -s nullglob
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cleanup() { lxf umount "$cnt"; }
buildscript() {
cat <<- EOF
#!/usr/bin/env bash
# The builder user is already created in the rootfs
export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin
export LC_ALL=en_US.UTF-8
# Network
dhcpcd eth0
# Upgrade
pacman -Suy --noconfirm
# Build dir
mkdir -m777 /buildroot
# Build the damn thing
cd /buildroot
sudo -u builder git clone "$pkg_url" .
sudo -u builder makepkg -s --noconfirm -L
EOF
}
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# Config
wrk_dir='/home/lxc'
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# Parameters
pkg_url=$1
pkg_dest=$2
cnt="_makepkg.$$"
cnt_dir="$wrk_dir/containers/$cnt"
# Create new container
lxf -r builder -i base new "$cnt" || exit $?
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# Unmount the thing in any case
trap 'cleanup' INT TERM EXIT
# Add the build script
buildscript > "$cnt_dir/rootfs/init"
chmod 755 "$cnt_dir/rootfs/init"
# Start the container
lxc-start -n "$cnt" -F /init || exit $?
# Put the artifacts where asked to
[[ "$pkg_dest" ]] && {
artifacts=( "$cnt_dir/rootfs/buildroot/"*.pkg.* )
for i in "${artifacts[@]}"; do
i_name="${i##*/}"
printf 'Found artifact: %s\n' "$i_name"
if [[ -f "$pkg_dest/$i_name" ]]; then
echo "$pkg_dest/$i_name already exists, not overwriting."
else
cp -vn "$i" "$pkg_dest"
fi
done
}