meta-opentrons/systemd: add DNS + NTP servers that are reachable from…

… China.

layers/meta-opentrons/recipes-core/systemd/files/dns-fallback.conf

@@ -0,0 +1,5 @@
+# Google DNS is not available in China so we alternative.
+
+[Resolve]
+DNS=8.8.8.8 2001:da8::666
+FallbackDNS=1.1.1.1

layers/meta-opentrons/recipes-core/systemd/files/ntp-fallback.conf

@@ -0,0 +1,5 @@
+# Google NTP is not available in China so we use alternative.
+
+[Time]
+NTP=time.google.com time.cloudflare.com ntp.tencent.com
+FallbackNTP=pool.ntp.org

layers/meta-opentrons/recipes-core/systemd/systemd_%.bbappend

@@ -1,3 +1,24 @@
 # xz support was present on older builds and must be present now to read journal files
 # from before the upgrade
 PACKAGECONFIG:append = " xz "
+FILESEXTRAPATHS:append := "${THISDIR}/files:"
+
+SRC_URI += " \
+    file://dns-fallback.conf \
+    file://ntp-fallback.conf \
+"
+
+do_install:append() {
+    # Google DNS + NTP servers are not reachable from China so use alternatives.
+    install -d 0755 ${D}${sysconfdir}/systemd/resolved.conf.d
+    install -d 0755 ${D}${sysconfdir}/systemd/timesyncd.conf.d
+    install -m 0644 ${WORKDIR}/dns-fallback.conf ${D}${sysconfdir}/systemd/resolved.conf.d/
+    install -m 0644 ${WORKDIR}/ntp-fallback.conf ${D}${sysconfdir}/systemd/timesyncd.conf.d/
+}
+
+FILES:${PN} += " \
+    ${sysconfdir}/systemd/resolved.conf.d \
+    ${sysconfdir}/systemd/timesyncd.conf.d \
+    ${sysconfdir}/systemd/resolved.conf.d/ntp-fallback.conf \
+    ${sysconfdir}/systemd/timesyncd.conf.d/dns-fallback.conf \
+"