Refactor ramdisk element to allow alternate implementations

In preparation for enabling Dracut-based ramdisks, this change
factors out functionality that is common to both busybox and Dracut
ramdisks.  Said functionality is moved to a ramdisk-base element
which is added as a dependency of the ramdisk element.  ramdisk now
only contains the functionality specific to building busybox-based
ramdisks.

bp tripleo-juno-dracut-ramdisks
Change-Id: Iad2907c8be491c88727d87ed5e5a720e5beb66c3

elements/ramdisk-base/README.md

@@ -0,0 +1 @@
+Shared functionality required by all of the different ramdisk elements.

elements/ramdisk-base/extra-data.d/scripts/init

@@ -0,0 +1,28 @@
+#!/bin/bash
+
+# Copyright (c) 2012 NTT DOCOMO, INC.
+# Copyright 2012 Hewlett-Packard Development Company, L.P.
+#
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+# NOTE(bnemec): We don't want this script to exit on failures because if init
+# dies then we get a kernel panic on ramdisk boot.
+# dib-lint: disable=sete setu setpipefail
+
+echo "init"
+
+source /init-func
+
+PATH=/sbin:/bin:/usr/bin:/usr/sbin
+export PATH

elements/ramdisk-base/extra-data.d/scripts/init-end

@@ -1,7 +1,6 @@
 
 
 # Final init steps
-
 echo "rebooting"
 reboot -f
 

elements/ramdisk-base/init.d/20-init-variables

@@ -0,0 +1,34 @@
+FIRST_ERR_MSG=
+
+# To identify that the node has booted from virtual media, a kernel
+# command-line argument boot_method=vmedia is added in the iso bootloader
+# configuration file (like isolinux.cfg for isolinux).
+VMEDIA_BOOT_TAG="vmedia"
+BOOT_METHOD=$(get_kernel_parameter boot_method)
+
+if [ "$BOOT_METHOD" = "$VMEDIA_BOOT_TAG" ]; then
+
+    # If the node booted from virtual media cdrom, the arguments for the
+    # installation are provided in virtual media floppy. Find out
+    # the virtual media device, mount it and get the information.
+    configure_vmedia_dir
+fi
+
+readonly _BOOTIF_=$(get_kernel_parameter BOOTIF)
+readonly _IP_=$(get_kernel_parameter ip)
+readonly BOOT_MAC_ADDRESS=$(echo "$_BOOTIF_" | sed -e "s/-/:/g" | \
+                            sed -e "s/^01://g" | tr 'a-f' 'A-F')
+readonly BOOT_SERVER=$(echo "$_IP_" | cut -d':' -f2)
+
+# IP address, netmask, gateway can be set a later point of time if
+# IP address is assigned by dhcp (for non-pxe boots).
+BOOT_IP_ADDRESS=$(echo "$_IP_" | cut -d':' -f1)
+BOOT_NETMASK=$(echo "$_IP_" | cut -d':' -f4)
+BOOT_GATEWAY=$(echo "$_IP_" | cut -d':' -f3)
+
+readonly DISK=$(get_kernel_parameter disk)
+
+readonly DEPLOYMENT_ID=$(get_kernel_parameter deployment_id)
+readonly DEPLOYMENT_KEY=$(get_kernel_parameter deployment_key)
+readonly ISCSI_TARGET_IQN=$(get_kernel_parameter iscsi_target_iqn)
+TROUBLESHOOT=$(get_kernel_parameter troubleshoot)

elements/ramdisk-base/init.d/40-check-network-ready

@@ -0,0 +1,6 @@
+if [ -n "$BOOT_SERVER" ]; then
+    echo "pinging to boot server $BOOT_SERVER"
+    wait_for 6 5 ping -c 5 -q "$BOOT_SERVER" > /dev/null
+fi
+
+echo "network ready"

elements/ramdisk/element-deps

@@ -1 +1,2 @@
 pkg-map
+ramdisk-base

elements/ramdisk/extra-data.d/scripts/init

@@ -1,122 +0,0 @@
-#!/bin/bash
-
-# Copyright (c) 2012 NTT DOCOMO, INC.
-# Copyright 2012 Hewlett-Packard Development Company, L.P.
-#
-#
-#    Licensed under the Apache License, Version 2.0 (the "License"); you may
-#    not use this file except in compliance with the License. You may obtain
-#    a copy of the License at
-#
-#         http://www.apache.org/licenses/LICENSE-2.0
-#
-#    Unless required by applicable law or agreed to in writing, software
-#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-#    License for the specific language governing permissions and limitations
-#    under the License.
-
-# NOTE(bnemec): We don't want this script to exit on failures because if init
-# dies then we get a kernel panic on ramdisk boot.
-# dib-lint: disable=sete setu setpipefail
-
-echo "init"
-
-source /init-func
-
-PATH=/sbin:/bin:/usr/bin:/usr/sbin
-export PATH
-
-mkdir -p /proc /sys /dev /boot /etc /mnt /lib/modules
-
-mount -t proc proc /proc
-
-FIRST_ERR_MSG=
-
-mount -t sysfs none /sys
-
-UDEVD=
-if [ -x "/bin/systemd-udevd" ]; then
-    UDEVD="systemd-udevd"
-else
-    UDEVD="udevd"
-fi
-
-# udev versions 176 and newer require a different on-disk setup
-UDEVD_VERSION=$(udevadm --version)
-
-if [ "$UDEVD_VERSION" != "" -a $UDEVD_VERSION -gt 175 ]; then
-    echo "Using new-style udevd setup"
-    mount -t devtmpfs none /dev
-    mkdir -p /run
-    mount -t tmpfs -o "nosuid,size=20%,mode=0755" tmpfs /run
-    mkdir -p /run/{lock,udev}
-else
-    echo "Using old-style udevd setup"
-    mount -t tmpfs none /dev
-    ln -sf /proc/self/fd /dev/fd
-    mknod /dev/null c 1 3
-    mknod /dev/zero c 1 5
-    mknod /dev/random c 1 8
-    mknod /dev/urandom c 1 9
-    mknod /dev/tty0 c 4 0
-    mknod /dev/tty1 c 4 1
-    mknod /dev/tty2 c 4 2
-    mknod /dev/tty3 c 4 3
-    mknod /dev/tty4 c 4 4
-    mknod /dev/tty5 c 4 5
-    mknod /dev/tty6 c 4 6
-    mknod /dev/tty7 c 4 7
-    mknod /dev/tty8 c 4 8
-    mknod /dev/tty9 c 4 9
-    mknod /dev/tty c 5 0
-    mknod -m 0600 /dev/console c 5 1
-    mknod -m 0666 /dev/ptmx c 5 2
-    mkdir -p /dev/.udev/data
-fi
-
-echo "starting syslogd"
-
-echo '*.* /initlog' > /etc/syslog.conf
-syslogd
-klogd
-
-echo "starting udevd"
-$UDEVD --daemon --resolve-names=never
-
-echo "load modules"
-load_modules_by_udev
-
-# To identify that the node has booted from virtual media, a kernel
-# command-line argument boot_method=vmedia is added in the iso bootloader
-# configuration file (like isolinux.cfg for isolinux).
-VMEDIA_BOOT_TAG="vmedia"
-BOOT_METHOD=$(get_kernel_parameter boot_method)
-
-if [ "$BOOT_METHOD" = "$VMEDIA_BOOT_TAG" ]; then
-
-    # If the node booted from virtual media cdrom, the arguments for the
-    # installation are provided in virtual media floppy. Find out
-    # the virtual media device, mount it and get the information.
-    configure_vmedia_dir
-fi
-
-readonly _BOOTIF_=$(get_kernel_parameter BOOTIF)
-readonly _IP_=$(get_kernel_parameter ip)
-readonly BOOT_MAC_ADDRESS=$(echo "$_BOOTIF_" | sed -e "s/-/:/g" | \
-                            sed -e "s/^01://g" | tr 'a-f' 'A-F')
-readonly BOOT_SERVER=$(echo "$_IP_" | cut -d':' -f2)
-
-# IP address, netmask, gateway can be set a later point of time if
-# IP address is assigned by dhcp (for non-pxe boots).
-BOOT_IP_ADDRESS=$(echo "$_IP_" | cut -d':' -f1)
-BOOT_NETMASK=$(echo "$_IP_" | cut -d':' -f4)
-BOOT_GATEWAY=$(echo "$_IP_" | cut -d':' -f3)
-
-readonly DISK=$(get_kernel_parameter disk)
-
-readonly DEPLOYMENT_ID=$(get_kernel_parameter deployment_id)
-readonly DEPLOYMENT_KEY=$(get_kernel_parameter deployment_key)
-readonly ISCSI_TARGET_IQN=$(get_kernel_parameter iscsi_target_iqn)
-TROUBLESHOOT=$(get_kernel_parameter troubleshoot)
-

elements/ramdisk/init.d/10-start-base-system

@@ -0,0 +1,57 @@
+mkdir -p /proc /sys /dev /boot /etc /mnt /lib/modules
+
+mount -t proc proc /proc
+
+mount -t sysfs none /sys
+
+UDEVD=
+if [ -x "/bin/systemd-udevd" ]; then
+    UDEVD="systemd-udevd"
+else
+    UDEVD="udevd"
+fi
+
+# udev versions 176 and newer require a different on-disk setup
+UDEVD_VERSION=$(udevadm --version)
+
+if [ "$UDEVD_VERSION" != "" -a $UDEVD_VERSION -gt 175 ]; then
+    echo "Using new-style udevd setup"
+    mount -t devtmpfs none /dev
+    mkdir -p /run
+    mount -t tmpfs -o "nosuid,size=20%,mode=0755" tmpfs /run
+    mkdir -p /run/{lock,udev}
+else
+    echo "Using old-style udevd setup"
+    mount -t tmpfs none /dev
+    ln -sf /proc/self/fd /dev/fd
+    mknod /dev/null c 1 3
+    mknod /dev/zero c 1 5
+    mknod /dev/random c 1 8
+    mknod /dev/urandom c 1 9
+    mknod /dev/tty0 c 4 0
+    mknod /dev/tty1 c 4 1
+    mknod /dev/tty2 c 4 2
+    mknod /dev/tty3 c 4 3
+    mknod /dev/tty4 c 4 4
+    mknod /dev/tty5 c 4 5
+    mknod /dev/tty6 c 4 6
+    mknod /dev/tty7 c 4 7
+    mknod /dev/tty8 c 4 8
+    mknod /dev/tty9 c 4 9
+    mknod /dev/tty c 5 0
+    mknod -m 0600 /dev/console c 5 1
+    mknod -m 0666 /dev/ptmx c 5 2
+    mkdir -p /dev/.udev/data
+fi
+
+echo "starting syslogd"
+
+echo '*.* /initlog' > /etc/syslog.conf
+syslogd
+klogd
+
+echo "starting udevd"
+$UDEVD --daemon --resolve-names=never
+
+echo "load modules"
+load_modules_by_udev

elements/ramdisk/init.d/30-start-network

@@ -50,11 +50,3 @@ else
     echo " netmask = $BOOT_NETMASK"
     echo " gateway = $BOOT_GATEWAY"
 fi
-
-if [ -n "$BOOT_SERVER" ]; then
-    echo "pinging to boot server $BOOT_SERVER"
-    wait_for 6 1 ping -c 5 -q "$BOOT_SERVER" > /dev/null
-fi
-
-echo "network ready"
-

elements/ramdisk/install.d/52-ramdisk-install-busybox

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+set -eu
+set -o pipefail
+
+install-packages busybox