confd: Dynamically generate factory-config

This allows you to define a single "logical" config that can be
tailored to the specific system based on the available interfaces,
base MAC address etc.

board/common/rootfs/etc/auto-factory.d/10-system.json

@@ -0,0 +1,5 @@
+{
+    "ietf-system:system": {
+	"hostname": "infix"
+    }
+}

board/common/rootfs/lib/infix/cfg-bootstrap

@@ -0,0 +1,25 @@
+#!/bin/sh
+
+set -e
+
+PATH=/lib/infix/factory:$PATH
+
+[ "$FACTORY_D" ] || FACTORY_D=/etc/auto-factory.d
+[ "$CFG_D" ]     || CFG_D=/cfg
+
+gen-hostname   >$FACTORY_D/20-auto-hostname.json
+gen-interfaces >$FACTORY_D/20-auto-interfaces.json
+
+jq -s add $(find $FACTORY_D -name '*.json') >$CFG_D/auto-factory-config.cfg
+
+# TODO: Look for statically defined factory-config, based on the
+# system's product ID.
+
+# If we haven't found a better one, settle for auto-factory-config as
+# the system's factory-config.
+[ -h $CFG_D/factory-config.cfg ] || \
+    ln -sf auto-factory-config.cfg $CFG_D/factory-config.cfg
+
+# On first boot, install factory-config as startup-config
+[ -f $CFG_D/startup-config.cfg ] || \
+    cp $CFG_D/factory-config.cfg $CFG_D/startup-config.cfg

board/common/rootfs/lib/infix/factory/gen-hostname

@@ -0,0 +1,42 @@
+#!/bin/sh
+
+set -e
+
+base_mac_lowest_physical()
+{
+    ip -d -j link show | jq -r '
+         .[] |
+         select(.link_type == "ether") |
+         select(has("linkinfo") | not) | .address' \
+    | sort | head -n 1
+}
+
+source_base_mac()
+{
+    # TODO: Source the base MAC from the vital product data memory, if
+    # available.
+    # base_mac=$(base_mac_vpd)
+    # [ "$base_mac" ] && return
+
+    base_mac=$(base_mac_lowest_physical)
+    [ "$base_mac" ] && return
+
+    base_mac=00:00:00:00:00:00
+}
+
+if [ "$1" ]; then
+    sysname="$1"
+else
+    sysname="$(cat /etc/hostname)"
+fi
+
+source_base_mac
+sysname="${sysname}-$(echo $base_mac | tail -c 9 | tr ':' '-')"
+
+cat <<EOF
+{
+  "ietf-system:system": {
+    "hostname": "${sysname}"
+  }
+}
+EOF

board/common/rootfs/lib/infix/factory/gen-interfaces

@@ -0,0 +1,39 @@
+#!/bin/sh
+
+set -e
+
+gen_interface()
+{
+    cat <<EOF
+      ,{
+        "name": "$1",
+        "type": "iana-if-type:ethernetCsmacd"
+      }
+EOF
+}
+
+phys_ifaces=$(ip -d -j link show | jq -r '
+	 .[] |
+	 select(.link_type == "ether") |
+	 select(has("linkinfo") | not) |
+	 .ifname')
+
+cat <<EOF
+{
+  "ietf-interfaces:interfaces": {
+    "interface": [
+      {
+        "name": "lo",
+        "type": "iana-if-type:softwareLoopback",
+        "ietf-ip:ipv4": {
+          "address": [{ "ip": "127.0.0.1", "prefix-length": 8 }]
+        },
+        "ietf-ip:ipv6": {
+          "address": [{ "ip": "::1", "prefix-length": 128 }]
+        }
+      }
+$(for iface in $phys_ifaces; do gen_interface $iface; done)
+    ]
+  }
+}
+EOF

package/confd/sysrepo.conf

@@ -1,4 +1,5 @@
 run [S] /lib/infix/clean-etc --
+run [S] /lib/infix/cfg-bootstrap --
 
 service name:sysrepo [S12345789] sysrepo-plugind -p /run/sysrepo.pid  -n -- Configuration daemon
 run [S] log <pid/sysrepo> sysrepocfg -v4 -E/cfg/startup-config.cfg -f json --

package/confd/tmpfiles.conf

@@ -1,2 +1,2 @@
 d  /run/resolvconf/interfaces	- - -
-C  /cfg/startup-config.cfg	- - -
+