From 6fb1c58ca015da93faf4c849336c23a5686c685d Mon Sep 17 00:00:00 2001
From: Richard Maw <richard.maw@codethink.co.uk>
Date: Tue, 25 Mar 2014 15:48:54 +0000
Subject: Add example deployment of an image package

---
 image-package-example/README                |  9 ++++
 image-package-example/common.sh.in          | 72 +++++++++++++++++++++++++++++
 image-package-example/disk-install.sh.in    | 51 ++++++++++++++++++++
 image-package-example/make-disk-image.sh.in | 36 +++++++++++++++
 4 files changed, 168 insertions(+)
 create mode 100644 image-package-example/README
 create mode 100644 image-package-example/common.sh.in
 create mode 100644 image-package-example/disk-install.sh.in
 create mode 100644 image-package-example/make-disk-image.sh.in

(limited to 'image-package-example')

diff --git a/image-package-example/README b/image-package-example/README
new file mode 100644
index 00000000..c1322f25
--- /dev/null
+++ b/image-package-example/README
@@ -0,0 +1,9 @@
+Image package example scripts
+=============================
+
+These are scripts used to create disk images or install the system onto
+an existing disk.
+
+This is also implemented independently for the rawdisk.write write
+extension; see morphlib.writeexts.WriteExtension.create_local_system()
+for a similar, python implementation.
diff --git a/image-package-example/common.sh.in b/image-package-example/common.sh.in
new file mode 100644
index 00000000..9a7389a7
--- /dev/null
+++ b/image-package-example/common.sh.in
@@ -0,0 +1,72 @@
+#!/bin/false
+# Script library to be used by disk-install.sh and make-disk-image.sh
+
+status(){
+    echo "$@"
+}
+
+info(){
+    echo "$@" >&2
+}
+
+warn(){
+    echo "$@" >&2
+}
+
+extract_rootfs(){
+    tar -C "$1" -xf @@ROOTFS_TAR_PATH@@ .
+}
+
+make_disk_image(){
+    truncate --size "$1" "$2"
+}
+
+format_disk(){
+    local disk="$1"
+    mkfs.ext4 -F -L rootfs "$disk"
+}
+
+install_fs_config(){
+    local mountpoint="$1"
+    local rootdisk="${2-/dev/vda}"
+    cat >>"$mountpoint/etc/fstab" <<EOF
+$rootdisk / ext4 rw,errors=remount-ro 0 0
+EOF
+    install -D -m 644 /proc/self/fd/0 "$mountpoint/boot/extlinux.conf" <<EOF
+DEFAULT baserock
+LABEL   baserock
+SAY     Booting Baserock
+LINUX   /boot/vmlinuz
+APPEND  root=$rootdisk
+EOF
+}
+
+install_bootloader(){
+    local disk="$1"
+    local mountpoint="$2"
+    dd if=@@IMAGE_DIR@@/mbr.bin conv=notrunc bs=440 count=1 of="$disk"
+    extlinux --install "$mountpoint/boot"
+}
+
+loop_file(){
+    losetup --show --find "$1"
+}
+unloop_file(){
+    #losetup --detach "$1"
+    # unlooping handled by umount -d, for busybox compatibility
+    true
+}
+
+temp_mount(){
+    local mp="$(mktemp -d)"
+    if ! mount "$@" "$mp"; then
+        rmdir "$mp"
+        return 1
+    fi
+    echo "$mp"
+}
+untemp_mount(){
+    # Unmount and detach in one step for busybox compatibility
+    umount -d "$1"
+    rmdir "$1"
+}
diff --git a/image-package-example/disk-install.sh.in b/image-package-example/disk-install.sh.in
new file mode 100644
index 00000000..bc8e0e67
--- /dev/null
+++ b/image-package-example/disk-install.sh.in
@@ -0,0 +1,51 @@
+#!/bin/sh
+# Script for writing the system to an existing disk.
+# This formats the disk, extracts the rootfs to it, installs the
+# bootloader, and ensures there's appropriate configuration for the
+# bootloader, kernel and userland to agree what the rootfs is.
+
+set -eu
+
+usage(){
+    cat <<EOF
+usage: $0 DISK [TARGET_DISK]
+
+DISK:        Where the disk appears on your development machine
+TARGET_DISK: What the disk will appear as on the target machine
+EOF
+}
+
+. @@SCRIPT_DIR@@/common.sh
+
+if [ "$#" -lt 1 -o "$#" -gt 2 ]; then
+    usage
+    exit 1
+fi
+
+DISK="$1"
+TARGET_DISK="${1-/dev/sda}"
+
+status Formatting "$DISK" as ext4
+format_disk "$DISK"
+(
+    info Mounting "$DISK"
+    MP="$(temp_mount -t ext4 "$DISK")"
+    info Mounted "$DISK" to "$MP"
+    set +e
+    (
+        set -e
+        info Copying rootfs onto disk
+        extract_rootfs "$MP"
+        info Configuring disk paths
+        install_fs_config "$MP" "$TARGET_DISK"
+        info Installing bootloader
+        install_bootloader "$DISK" "$MP"
+    )
+    ret="$?"
+    if [ "$ret" != 0 ]; then
+        warn Filling rootfs failed with "$ret"
+    fi
+    info Unmounting "$DISK" from "$MP" and removing "$MP"
+    untemp_mount "$MP"
+    exit "$ret"
+)
diff --git a/image-package-example/make-disk-image.sh.in b/image-package-example/make-disk-image.sh.in
new file mode 100644
index 00000000..61264fa0
--- /dev/null
+++ b/image-package-example/make-disk-image.sh.in
@@ -0,0 +1,36 @@
+#!/bin/sh
+# Script for writing the system to a disk image file.
+# This creates a file of the right size, attaches it to a loop device,
+# then hands the rest of the work off to disk-install.sh
+
+usage(){
+    cat <<EOF
+usage: $0 FILENAME SIZE [TARGET_DISK]
+
+FILENAME:    Location to write the disk image to
+SIZE:        Size to create the disk image with
+TARGET_DISK: What the disk will appear as on the target machine
+EOF
+}
+
+. @@SCRIPT_DIR@@/common.sh
+
+if [ "$#" -lt 2 -o "$#" -gt 3 ]; then
+    usage
+    exit 1
+fi
+
+DISK_IMAGE="$1"
+DISK_SIZE="$2"
+TARGET_DISK="${3-/dev/vda}"
+
+make_disk_image "$DISK_SIZE" "$DISK_IMAGE"
+
+(
+    LOOP="$(loop_file "$DISK_IMAGE")"
+    set +e
+    @@SCRIPT_DIR@@/disk-install.sh "$DISK_IMAGE" "$TARGET_DISK"
+    ret="$?"
+    unloop_file "$LOOP"
+    exit "$ret"
+)
-- 
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