Adjust systemd-nspawn flags

* Remove --keep-unit since it causes sometimes errors and does not seem
  to be required
* Increase maximum number of open files (the default of 1000 is too less
  for some packages)
* Use /etc/resolv.conf from host (otherwise systemd-nspawn uses a config
  which does not work on my host setup)

arch-nspawn.in

@@ -99,7 +99,7 @@ build_mount_args() {
 copy_hostconf () {
 	unshare --fork --pid gpg --homedir "$working_dir"/etc/pacman.d/gnupg/ --no-permission-warning --quiet --batch --import --import-options import-local-sigs "$(pacman-conf GpgDir)"/pubring.gpg >/dev/null 2>&1
 	pacman-key --gpgdir "$working_dir"/etc/pacman.d/gnupg/ --import-trustdb "$(pacman-conf GpgDir)" >/dev/null 2>&1
-	printf 'Server = %s\n' "${host_mirrors[@]}" >"$working_dir/etc/pacman.d/mirrorlist"
+	#printf 'Server = %s\n' "${host_mirrors[@]}" >"$working_dir/etc/pacman.d/mirrorlist"
 
 	[[ -n $pac_conf ]] && cp "$pac_conf" "$working_dir/etc/pacman.conf"
 	[[ -n $makepkg_conf ]] && cp "$makepkg_conf" "$working_dir/etc/makepkg.conf"
@@ -130,9 +130,12 @@ eval "$(grep -a '^CARCH=' "$working_dir/etc/makepkg.conf")"
 
 [[ -z $nosetarch ]] || unset CARCH
 
-exec ${CARCH:+setarch "$CARCH"} systemd-nspawn -q \
+exec systemd-nspawn -q \
 	-D "$working_dir" \
 	-E "PATH=/usr/local/sbin:/usr/local/bin:/usr/bin" \
-	--register=no --keep-unit --as-pid2 \
+	--register=no \
+	--as-pid2 \
+	--rlimit=NOFILE=10000 \
+	--resolv-conf=copy-host \
 	"${mount_args[@]}" \
 	"$@"

archbuild.in

@@ -69,7 +69,7 @@ if ${clean_first} || [[ ! -d "${chroots}/${repo}-${arch}" ]]; then
 
 	rm -rf --one-file-system "${chroots}/${repo}-${arch}"
 	mkdir -m755 -p "${chroots}/${repo}-${arch}"
-	setarch "${arch}" mkarchroot \
+	mkarchroot \
 		-C "${pacman_config}" \
 		-M "${makepkg_config}" \
 		"${chroots}/${repo}-${arch}/root" \

makechrootpkg.in

@@ -15,7 +15,7 @@ m4_include(lib/archroot.sh)
 
 shopt -s nullglob
 
-default_makepkg_args=(--syncdeps --noconfirm --log --holdver --skipinteg)
+default_makepkg_args=(--syncdeps --noconfirm --holdver --skipinteg)
 makepkg_args=("${default_makepkg_args[@]}")
 verifysource_args=()
 chrootdir=
@@ -61,6 +61,7 @@ usage() {
 	echo 'Flags:'
 	echo '-h         This help'
 	echo '-c         Clean the chroot before building'
+	echo '-C <dir>   Set pacman cache to pass to arch-nspawn'
 	echo '-d <dir>   Bind directory into build chroot as read-write'
 	echo '-D <dir>   Bind directory into build chroot as read-only'
 	echo '-u         Update the working copy of the chroot before building'
@@ -187,9 +188,7 @@ prepare_chroot() {
 
 	$install -d "$copydir"/{build,startdir,{pkg,srcpkg,src,log}dest}
 
-	sed -e '/^MAKEFLAGS=/d' -e '/^PACKAGER=/d' -i "$copydir/etc/makepkg.conf"
-	for x in BUILDDIR=/build PKGDEST=/pkgdest SRCPKGDEST=/srcpkgdest SRCDEST=/srcdest LOGDEST=/logdest \
-		"MAKEFLAGS='${MAKEFLAGS:-}'" "PACKAGER='${PACKAGER:-}'"
+	for x in BUILDDIR=/build PKGDEST=/pkgdest SRCPKGDEST=/srcpkgdest SRCDEST=/srcdest LOGDEST=/logdest
 	do
 		grep -q "^$x" "$copydir/etc/makepkg.conf" && continue
 		echo "$x" >>"$copydir/etc/makepkg.conf"
@@ -229,7 +228,9 @@ _chrootbuild() {
 	# use "$" in arguments to commands with "sudo -i".  ${foo} or
 	# ${1} is OK, but $foo or $1 isn't.
 	# https://bugzilla.sudo.ws/show_bug.cgi?id=765
-	sudo --preserve-env=SOURCE_DATE_EPOCH -iu builduser bash -c 'cd /startdir; makepkg "$@"' -bash "$@"
+	mkdir /build/.distcc
+	chown builduser /build/.distcc
+	sudo --preserve-env=SOURCE_DATE_EPOCH -iu builduser DISTCC_IO_TIMEOUT=1200 DISTCC_DIR='/build/.distcc' bash -c 'cd /startdir; makepkg "$@"' -bash "$@"
 	ret=$?
 	case $ret in
 		0)
@@ -261,7 +262,7 @@ download_sources() {
 	# Ensure sources are downloaded
 	sudo -u "$makepkg_user" --preserve-env=GNUPGHOME \
 		env SRCDEST="$SRCDEST" BUILDDIR="$WORKDIR" \
-		makepkg --config="$copydir/etc/makepkg.conf" --verifysource -o "${verifysource_args[@]}" ||
+		makepkg -A --config="$copydir/etc/makepkg.conf" --verifysource -o "${verifysource_args[@]}" ||
 		die "Could not download sources."
 }
 
@@ -296,12 +297,13 @@ move_products() {
 }
 # }}}
 
-while getopts 'hcur:I:l:nTD:d:U:' arg; do
+while getopts 'hcuC:r:I:l:nTD:d:U:' arg; do
 	case "$arg" in
 		c) clean_first=1 ;;
 		D) bindmounts_ro+=("--bind-ro=$OPTARG") ;;
 		d) bindmounts_rw+=("--bind=$OPTARG") ;;
 		u) update_first=1 ;;
+		C) cache_dir="$OPTARG" ;;
 		r) passeddir="$OPTARG" ;;
 		I) install_pkgs+=("$OPTARG") ;;
 		l) copy="$OPTARG" ;;
@@ -386,7 +388,7 @@ download_sources
 
 prepare_chroot
 
-if arch-nspawn "$copydir" \
+if arch-nspawn $cache_dir "$copydir" \
 	--bind="${PWD//:/\\:}:/startdir" \
 	--bind="${SRCDEST//:/\\:}:/srcdest" \
 	"${bindmounts_ro[@]}" "${bindmounts_rw[@]}" \