genmac: Replace RANDOM_MAC in network/interfaces with a randomly generated MAC

For machines that do not have a MAC in hardware and with drivers that don't
generate a random one in the kernel, this init script will replace the string
RANDOM_MAC in the network/interfaces file with one generated with "ranpwd -m".
Care is taken to ensure multiple interfaces can use RANDOM_MAC and receive
unique addresses. ranpwd generates MACs with the locally administered bit set
and the multicast bit disabled.

Signed-off-by: Darren Hart <dvhart@linux.intel.com>
Signed-off-by: Joshua Lock <josh@linux.intel.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/meta-sys940x/recipes-bsp/genmac/genmac.bb b/meta-sys940x/recipes-bsp/genmac/genmac.bb
new file mode 100644
index 00000000..56849b46
--- /dev/null
+++ b/meta-sys940x/recipes-bsp/genmac/genmac.bb
@@ -0,0 +1,30 @@
+SUMMARY = "Provide a basic init script to generate a random MAC"
+DESCRIPTION = "Set the MAC from the config file."
+SECTION = "base"
+LICENSE = "MIT"
+LIC_FILES_CHKSUM = "file://${COREBASE}/LICENSE;md5=3f40d7994397109285ec7b81fdeb3b58"
+
+PR = "r0"
+
+inherit update-rc.d
+
+RDEPENDS_${PN} = "ranpwd"
+
+SRC_URI = "file://genmac"
+
+INITSCRIPT_NAME = "genmac"
+# Run as early as possible to ensure we are before the networking scripts
+INITSCRIPT_PARAMS = "start 39 S ."
+
+do_install() {
+        install -d ${D}${sysconfdir} \
+                   ${D}${sysconfdir}/init.d
+        install -m 0755 ${WORKDIR}/${INITSCRIPT_NAME} ${D}${sysconfdir}/init.d
+        cat ${WORKDIR}/${INITSCRIPT_NAME} | \
+            sed -e 's,/etc,${sysconfdir},g' \
+                -e 's,/usr/sbin,${sbindir},g' \
+                -e 's,/var,${localstatedir},g' \
+                -e 's,/usr/bin,${bindir},g' \
+                -e 's,/usr,${prefix},g' > ${D}${sysconfdir}/init.d/${INITSCRIPT_NAME}
+        chmod 755 ${D}${sysconfdir}/init.d/${INITSCRIPT_NAME}
+}