From a97dea93d28ba272613029e46a8a0b1f699729d8 Mon Sep 17 00:00:00 2001
From: Richard Maw <richard.maw@codethink.co.uk>
Date: Tue, 27 May 2014 14:58:14 +0000
Subject: Add initial version of initramfs script

---
 init                    | 107 ++++++++++++++++++++++++++++++++++++++++++++++++
 initramfs-scripts.morph |   5 +++
 2 files changed, 112 insertions(+)
 create mode 100644 init
 create mode 100644 initramfs-scripts.morph

diff --git a/init b/init
new file mode 100644
index 0000000..fa31c0e
--- /dev/null
+++ b/init
@@ -0,0 +1,107 @@
+#!/bin/sh
+set -e
+
+# We need proc for reading the kernel command line
+mount -n -t proc none /proc
+
+set -- $(cat /proc/cmdline)
+
+# We don't want to leave mount points around
+umount /proc
+
+for arg; do
+    case "$arg" in
+    root=LABEL=*)
+        if [ x"$root_type" != x ]; then
+            echo "Warning, multiple root= specified, using latest."
+        fi
+        root_type=label
+        root="${arg#root=LABEL=}"
+        ;;
+    root=UUID=*)
+        if [ x"$root_type" != x ]; then
+            echo "Warning, multiple root= specified, using latest."
+        fi
+        root_type=uuid
+        root="${arg#root=UUID=}"
+        ;;
+    root=*)
+        if [ x"$root_type" != x ]; then
+            echo "Warning, multiple root= specified, using latest."
+        fi
+        root_type=disk
+        root="${arg#root=}"
+        ;;
+    rootflags=*)
+        if [ x"$rootflags" != x ]; then
+            echo "Warning, multiple rootflags= specified, using latest."
+        fi
+        rootflags=",${arg#rootflags=}"
+        ;;
+    rootfstype=*)
+        if [ x"$rootflags" != x ]; then
+            echo "Warning, multiple rootfstype= specified, using latest."
+        fi
+        rootfstype="${arg#rootfstype=}"
+        ;;
+    rootdelay=*)
+        if [ x"$rootflags" != x ]; then
+            echo "Warning, multiple rootdelay= specified, using latest."
+        fi
+        rootfstype="${arg#rootdelay=}"
+        ;;
+    ro)
+        ro=ro
+        ;;
+    rw)
+        ro=rw
+        ;;
+    init=*)
+        init="${arg#init=}"
+        ;;
+    esac
+done
+
+if [ x"$rootdelay" != x ]; then
+    sleep "$rootdelay"
+fi
+
+if [ x"$rootfstype" = x ]; then
+    # Warn that busybox may not be able to auto-detect rootfs type
+    cat <<\EOF
+Warning, rootfs type not specified, auto-detection of type is slow and
+may fail. Please add rootfstype=$type to kernel command line.
+EOF
+fi
+
+mount -n -t devtmpfs devtmpfs /dev
+case "$root_type" in
+disk)
+    mount -n -t "${rootfstype}" -o "${ro-rw}""$rootflags" "$root" /mnt
+    ;;
+label)
+    disk="$(findfs LABEL="$root")"
+    if [ x"$disk" = x ]; then
+        echo disk with label $root not found
+        blkid
+        exit 1
+    fi
+    mount -n -t "${rootfstype}" -o "${ro-rw}""$rootflags" "$disk" /mnt
+    ;;
+uuid)
+    disk="$(findfs UUID="$root")"
+    if [ x"$disk" = x ]; then
+        echo disk with UUID $root not found
+        blkid
+        exit 1
+    fi
+    mount -n -t "${rootfstype}" -o "${ro-rw}""$rootflags" "$disk" /mnt
+    ;;
+'')
+    echo "Error, no root specified"
+    exit 1
+    ;;
+esac
+umount -n /dev
+
+exec switch_root -c /dev/console /mnt "${init-/sbin/init}"
diff --git a/initramfs-scripts.morph b/initramfs-scripts.morph
new file mode 100644
index 0000000..77bba20
--- /dev/null
+++ b/initramfs-scripts.morph
@@ -0,0 +1,5 @@
+name: initramfs-scripts
+kind: chunk
+build-system: manual
+install-commands:
+- install -m 755 init "$DESTDIR/init"
-- 
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