Buildroot 2020.05 has some changes to openrc so adapt the files to work

with it.

Also add a ChangeLog

ChangeLog

+2020-09-09	Jonathan Currier 	<dullfire@yahoo.com>
+	* Breaking changes:
+		the update user no longer allows buildroot to auto assign uid/gui, and
+		is now hard coded to 768/768. Reason is that auto assigned id can
+		change, however people may reasonably use the dev-data partion to have
+		update user/group files, which would randomly and supprisngly break.
+		This update should prevent future breakage (but can't prevent this
+		one).
+
+	* Buildroot 2020.05.x now recommended, 2019.08 may not work well or at all.
+
+	* Notable improvments:
+		usb-ecm now only uses a random mac if one is not already detected, and
+		saves the mac for use next time. Obviously only works if persistence
+		is enable, or if it's burned into dev-data.
+
+	* Other notes:
+		buildroot has a bug in openrc build that results in the 'local'
+		service not being in default. bangBMC will add it back in, however
+		hopefully a patch can be merged to upstream buildroot and the
+		workaround can be dropped.

board/bangBMC/fakeroot-fs.sh

 #!/bin/sh
-
+set -e
 TARGET_DIR="$1"
 
 TOPDIR=$(pwd)
@@ -9,7 +9,7 @@ BOARD_DIR=${BR2_EXTERNAL_bangBMC_PATH}/board/bangBMC
 shift 1
 . ${BOARD_DIR}/script-support.frag.sh
 
-[ -z "${TARGET_DIR}"] && echo "empty target dir" && exit 1
+[ -z "${TARGET_DIR}" ] && echo "empty target dir" && exit 1
 
 echo "disabling undesirable init scripts"
 

board/bangBMC/overlay/etc/inittab

@@ -18,6 +18,5 @@
 # Launch a getty on ttyS4
 # openrc (a)getty controll is a bit more complex (and flexible)
 # but lets just put this one-liner here
-ttyS4::respawn:/sbin/getty -L ttyS4 115200 xterm
 
 ::shutdown:/sbin/openrc shutdown

board/bangBMC/overlay/etc/local.d/usb-ecm.start

 #!/bin/sh
 # simply sets up an ecm gadget
-set -x
-mount -t configfs config /config
-cd /config/usb_gadget/
+set -e
+SCRIPT_CFG_FILE="/etc/conf.d/usb-ecm.conf"
+if [ -e "${SCRIPT_CFG_FILE}" ] ; then
+    . "${SCRIPT_CFG_FILE}" || true
+fi
+CONFIG_DIR="/sys/kernel/config"
+# Newer buildroot has openrc set to automount the configfs
+# so no need to meddle with it
+#mount -t configfs config /config
+cd ${CONFIG_DIR}/usb_gadget/
 mkdir g0
 cd g0/functions/
 mkdir ecm.0
+# Arbitrarily key off host_addr
+if [ -n "${usb_ecm_host_addr}" ] ; then
+    cd ecm.0
+    echo "${usb_ecm_host_addr}" >host_addr
+    echo "${usb_ecm_dev_addr}" >dev_addr
+    cd -
+else
+    usb_ecm_host_addr="$(cat ecm.0/host_addr)"
+    usb_ecm_dev_addr="$(cat ecm.0/dev_addr)"
+    echo '
+usb_ecm_host_addr="'${usb_ecm_host_addr}'"
+usb_ecm_dev_addr="'${usb_ecm_dev_addr}'"
+    ' >> ${SCRIPT_CFG_FILE}
+fi
 cd ../configs/
 mkdir c.1
 cd c.1/

board/bangBMC/overlay/etc/runlevels/default/local

+../../init.d/local
\ No newline at end of file

package/update-shell/update-shell.mk

@@ -7,8 +7,15 @@ UPDATE_SHELL_AUTORECONF = YES
 UPDATE_SHELL_DEPENDENCIES = host-pkgconf
 
 
+# Give the shell user a fix uid/gid.
+# The reason for this is that buildroot does/has changed their
+# uid/gid mapins so auto-assign may drift. this normally would not be
+# a problem, however dev-data has uid and gids embedded in it, which means an
+# update would break dev-data. This has already happened, so this change should
+# prevent further breakage (or at least generated a build time error instead
+# of silently breaking things).
 define UPDATE_SHELL_USERS
-	update -1 update -1 * /usr/libexec/update /usr/bin/update-shell - user account for performing system updates
+	update 768 update 768 * /usr/libexec/update /usr/bin/update-shell - user account for performing system updates
 endef
 
 # update-su is only executable