diff --git a/sample_images/disk_ext2_1k.txt b/sample_images/disk_ext2_1k.txt
new file mode 100644
index 0000000..f13c080
--- /dev/null
+++ b/sample_images/disk_ext2_1k.txt
@@ -0,0 +1 @@
+16777216 1024
diff --git a/sample_images/disk_ext2_4k.txt b/sample_images/disk_ext2_4k.txt
new file mode 100644
index 0000000..d01d105
--- /dev/null
+++ b/sample_images/disk_ext2_4k.txt
@@ -0,0 +1 @@
+16777216 4096
diff --git a/sample_images/generate_image.sh b/sample_images/generate_image.sh
new file mode 100755
index 0000000..0f0c384
--- /dev/null
+++ b/sample_images/generate_image.sh
@@ -0,0 +1,111 @@
+#!/bin/bash
+
+# Copyright 2015 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+set -e
+
+# cleanup <path>
+# Unmount and remove the mountpoint <path>
+cleanup() {
+  if ! sudo umount "$1" 2>/dev/null; then
+    if mountpoint -q "$1"; then
+      sync && sudo umount "$1"
+    fi
+  fi
+  rmdir "$1"
+}
+
+# generate_fs <filename> <size> [block_size] [block_groups]
+generate_fs() {
+  local filename="$1"
+  local size="$2"
+  local block_size="${3:-4096}"
+  local block_groups="${4:-}"
+
+  local mkfs_opts=( -q -F -b "${block_size}" -L "ROOT-TEST" -t ext2 )
+  if [[ -n "${block_groups}" ]]; then
+    mkfs_opts+=( -G "${block_groups}" )
+  fi
+
+  local mntdir=$(mktemp --tmpdir -d generate_ext2.XXXXXX)
+  trap 'cleanup "${mntdir}"; rm -f "${filename}"' INT TERM EXIT
+
+  # Cleanup old image.
+  if [[ -e "${filename}" ]]; then
+    rm -f "${filename}"
+  fi
+  truncate --size="${size}" "${filename}"
+
+  mkfs.ext2 "${mkfs_opts[@]}" "${filename}"
+  sudo mount "${filename}" "${mntdir}" -o loop
+
+  ### Generate the files used in unittest with descriptive names.
+  sudo touch "${mntdir}"/empty-file
+
+  # regular: Regular files.
+  echo "small file" | sudo dd of="${mntdir}"/regular-small status=none
+  dd if=/dev/zero bs=1024 count=16 status=none | tr '\0' '\141' |
+    sudo dd of="${mntdir}"/regular-16k status=none
+  sudo dd if=/dev/zero of="${mntdir}"/regular-32k-zeros bs=1024 count=16 \
+    status=none
+
+  echo "with net_cap" | sudo dd of="${mntdir}"/regular-with_net_cap status=none
+  sudo setcap cap_net_raw=ep "${mntdir}"/regular-with_net_cap
+
+  # sparse_empty: Files with no data blocks at all (only sparse holes).
+  sudo truncate --size=10240 "${mntdir}"/sparse_empty-10k
+  sudo truncate --size=$(( block_size * 2 )) "${mntdir}"/sparse_empty-2blocks
+
+  # sparse: Files with some data blocks but also sparse holes.
+  echo -n "foo" |
+    sudo dd of="${mntdir}"/sparse-16k-last_block bs=1 \
+      seek=$(( 16 * 1024 - 3)) status=none
+
+  # ext2 inodes have 12 direct blocks, one indirect, one double indirect and
+  # one triple indirect. 10000 should be enough to have an indirect and double
+  # indirect block.
+  echo -n "foo" |
+    sudo dd of="${mntdir}"/sparse-10000blocks bs=1 \
+      seek=$(( block_size * 10000 )) status=none
+
+  sudo truncate --size=16384 "${mntdir}"/sparse-16k-first_block
+  echo "first block" | sudo dd of="${mntdir}"/sparse-16k-first_block status=none
+
+  sudo truncate --size=16384 "${mntdir}"/sparse-16k-holes
+  echo "a" | sudo dd of="${mntdir}"/sparse-16k-holes bs=1 seek=100 status=none
+  echo "b" | sudo dd of="${mntdir}"/sparse-16k-holes bs=1 seek=10000 status=none
+
+  # link: symlinks and hardlinks.
+  sudo ln -s "broken-link" "${mntdir}"/link-short_symlink
+  sudo ln -s $(dd if=/dev/zero bs=256 count=1 status=none | tr '\0' '\141') \
+    "${mntdir}"/link-long_symlink
+  sudo ln "${mntdir}"/regular-16k "${mntdir}"/link-hard-regular-16k
+
+  # Directories.
+  sudo mkdir -p "${mntdir}"/dir1/dir2/dir1
+  echo "foo" | sudo tee "${mntdir}"/dir1/dir2/file >/dev/null
+  echo "bar" | sudo tee "${mntdir}"/dir1/file >/dev/null
+
+  # removed: removed files that should not be listed.
+  echo "We will remove this file so it's contents will be somewhere in the " \
+    "empty space data but it won't be all zeros." |
+    sudo dd of="${mntdir}"/removed conv=fsync status=none
+  sudo rm "${mntdir}"/removed
+
+  cleanup "${mntdir}"
+  trap - INT TERM EXIT
+}
+
+image_desc="${1:-}"
+output_dir="${2:-}"
+
+if [[ ! -e "${image_desc}" || ! -d "${output_dir}" ]]; then
+  echo "Use: $0 <image_description.txt> <output_dir>" >&2
+  exit 1
+fi
+
+args=( $(cat ${image_desc}) )
+dest_image="${output_dir}/$(basename ${image_desc} .txt).img"
+generate_fs "${dest_image}" "${args[@]}"