put the build script into the makepkg-overlay script

makepkg-overlay

@@ -1,7 +1,27 @@
 #!/usr/bin/env bash
 
-cleanup() {
-	umount "$cnt_dir/rootfs"
+buildscript() {
+	cat <<- EOF
+		#!/usr/bin/env bash
+		# The builder user is already created in the rootfs
+
+		export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin
+		export LC_ALL=en_US.UTF-8
+
+		# Network
+		dhcpcd eth0
+
+		# Upgrade
+		pacman -Suy --noconfirm
+
+		# Build dir
+		mkdir -m777 /buildroot
+
+		# Build the damn thing
+		cd /buildroot
+		sudo -u builder git clone "$pkg_url" .
+		sudo -u builder makepkg -s --noconfirm -L
+	EOF
 }
 
 wrk_dir='/home/lxc'
@@ -11,12 +31,15 @@ pkg_dest=$2
 cnt="_makepkg.$$"
 cnt_dir="$wrk_dir/containers/$cnt"
 
+# Unmount the thing in any case
+cleanup() { lxf umount "$cnt"; }
 trap 'cleanup' INT TERM EXIT
 
-lxf -r builder -i builder new "$cnt"
+# Create new container
+lxf -r builder -i base new "$cnt"
 
 # Add the build script
-cp "$wrk_dir/files/buildpackage" "$cnt_dir/rootfs/init"
+buildscript > "$cnt_dir/rootfs/init"
 chmod 755 "$cnt_dir/rootfs/init"
 
 # Tell it where to fetch the package
@@ -25,7 +48,7 @@ echo "$pkg_url" > "$cnt_dir/rootfs/repo"
 export PKG_GIT_URL="$pkg_url"
 
 # Start the container
-lxc-start -n "$cnt" -F; lxc_exit=$?
+lxc-start -n "$cnt" -F /init; lxc_exit=$?
 (( lxc_exit )) && exit "$lxc_exit"
 
 # Put the artifacts where asked to