birbnetes/raspi-alpine-builder
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Merge branch 'go_interface_library' into 'master'

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Go interface library

See merge request bboehmke/raspi-alpine-builder!1
This commit is contained in:
Benjamin Böhmke 2019-12-03 17:52:14 +00:00
commit e795fe0158
13 changed files with 800 additions and 7 deletions
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3
.gitignore vendored
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@ -1 +1,2 @@
.idea/
.idea/
test_*

8
go.mod Normal file
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@ -0,0 +1,8 @@
module gitlab.com/bboehmke/raspi-alpine-builder
go 1.13
require (
github.com/GehirnInc/crypt v0.0.0-20190301055215-6c0105aabd46
github.com/stretchr/testify v1.4.0
)

14
go.sum Normal file
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@ -0,0 +1,14 @@
github.com/GehirnInc/crypt v0.0.0-20190301055215-6c0105aabd46 h1:rs0kDBt2zF4/CM9rO5/iH+U22jnTygPlqWgX55Ufcxg=
github.com/GehirnInc/crypt v0.0.0-20190301055215-6c0105aabd46/go.mod h1:kC29dT1vFpj7py2OvG1khBdQpo3kInWP+6QipLbdngo=
github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/stretchr/objx v0.1.0 h1:4G4v2dO3VZwixGIRoQ5Lfboy6nUhCyYzaqnIAPPhYs4=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

171
network.go Normal file
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package alpine_builder
import (
"bufio"
"bytes"
"errors"
"fmt"
"io/ioutil"
"os"
"regexp"
"strings"
)
// network configuration
var networkConfig = "/data/etc/network/interfaces"
var networkInterface = "eth0"
// regular expressions
var reSectionStart = regexp.MustCompile("^(iface|mapping|auto|allow-|source)")
var reIface = regexp.MustCompile("^iface (\\w+) inet (\\w+)")
var reStaticAddress = regexp.MustCompile("^(\\s*)address ([0-9.]+)")
var reStaticNetmask = regexp.MustCompile("^(\\s*)netmask ([0-9.]+)")
var reStaticGateway = regexp.MustCompile("^(\\s*)gateway ([0-9.]+)")
// NetworkInfo represents the actual network configuration
type NetworkInfo struct {
IsStatic bool
Address string
Netmask string
Gateway string
}
// GetNetworkInfo from config file
func GetNetworkInfo() (*NetworkInfo, error) {
// load config file
file, err := os.Open(networkConfig)
if err != nil {
return nil, fmt.Errorf("failed to open network config: %w", err)
}
defer file.Close()
var info *NetworkInfo
scanner := bufio.NewScanner(file)
for scanner.Scan() {
line := strings.TrimSpace(scanner.Text())
// check for section start
if reSectionStart.MatchString(line) {
infLine := reIface.FindStringSubmatch(line)
if infLine != nil {
// interface found
if infLine[1] == networkInterface {
info = &NetworkInfo{
IsStatic: infLine[2] == "static",
}
}
} else {
// info set -> stop here
if info != nil {
break
}
}
} else if info != nil {
// interface config
address := reStaticAddress.FindStringSubmatch(line)
if address != nil {
info.Address = address[2]
}
netmask := reStaticNetmask.FindStringSubmatch(line)
if netmask != nil {
info.Netmask = netmask[2]
}
gateway := reStaticGateway.FindStringSubmatch(line)
if gateway != nil {
info.Gateway = gateway[2]
}
}
}
if info != nil {
return info, nil
}
return nil, errors.New("invalid network config")
}
// NetworkEnableDHCP configures the network to use DHCP client
func NetworkEnableDHCP() error {
// load config file
file, err := os.Open(networkConfig)
if err != nil {
return fmt.Errorf("failed to open network config: %w", err)
}
defer file.Close()
var buffer bytes.Buffer
var infFound bool
scanner := bufio.NewScanner(file)
for scanner.Scan() {
line := strings.TrimSpace(scanner.Text())
// check for section start
if reSectionStart.MatchString(line) {
infLine := reIface.FindStringSubmatch(line)
if infLine != nil {
// interface found
if infLine[1] == networkInterface {
infFound = true
buffer.WriteString(fmt.Sprintf("iface %s inet dhcp\n", networkInterface))
continue
}
} else {
if infFound {
infFound = false
}
}
buffer.WriteString(line + "\n")
} else if !infFound {
buffer.WriteString(line + "\n")
}
}
// write config file
return ioutil.WriteFile(networkConfig, buffer.Bytes(), os.ModePerm)
}
// NetworkSetStatic IP configuration
func NetworkSetStatic(address, netmask, gateway string) error {
// load config file
file, err := os.Open(networkConfig)
if err != nil {
return fmt.Errorf("failed to open network config: %w", err)
}
defer file.Close()
var buffer bytes.Buffer
var infFound bool
scanner := bufio.NewScanner(file)
for scanner.Scan() {
line := strings.TrimSpace(scanner.Text())
// check for section start
if reSectionStart.MatchString(line) {
infLine := reIface.FindStringSubmatch(line)
if infLine != nil {
// interface found
if infLine[1] == networkInterface {
infFound = true
buffer.WriteString(fmt.Sprintf("iface %s inet static\n", networkInterface))
buffer.WriteString(fmt.Sprintf(" address %s\n", address))
buffer.WriteString(fmt.Sprintf(" netmask %s\n", netmask))
buffer.WriteString(fmt.Sprintf(" gateway %s\n", gateway))
continue
}
} else {
if infFound {
infFound = false
}
}
buffer.WriteString(line + "\n")
} else if !infFound {
buffer.WriteString(line + "\n")
}
}
// write config file
return ioutil.WriteFile(networkConfig, buffer.Bytes(), os.ModePerm)
}

116
network_test.go Normal file
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package alpine_builder
import (
"io/ioutil"
"os"
"testing"
"github.com/stretchr/testify/assert"
)
func init() {
networkConfig = "test_interfaces"
}
func TestGetNetworkInfo(t *testing.T) {
ass := assert.New(t)
// file does not exist
_, err := GetNetworkInfo()
ass.EqualError(err, "failed to open network config: open test_interfaces: no such file or directory")
// invalid config file
ass.NoError(ioutil.WriteFile(networkConfig, []byte(""), os.ModePerm))
_, err = GetNetworkInfo()
ass.EqualError(err, "invalid network config")
// dynamic config
ass.NoError(ioutil.WriteFile(networkConfig, []byte(`auto lo
iface lo inet loopback
auto eth0
iface eth0 inet dhcp`), os.ModePerm))
info, err := GetNetworkInfo()
ass.NoError(err)
ass.False(info.IsStatic)
// static config
ass.NoError(ioutil.WriteFile(networkConfig, []byte(`auto lo
iface lo inet loopback
auto eth0
iface eth0 inet static
address 1.2.3.4
netmask 255.255.255.0
gateway 4.3.2.1`), os.ModePerm))
info, err = GetNetworkInfo()
ass.NoError(err)
ass.True(info.IsStatic)
ass.Equal("1.2.3.4", info.Address)
ass.Equal("255.255.255.0", info.Netmask)
ass.Equal("4.3.2.1", info.Gateway)
_ = os.Remove(networkConfig)
}
func TestNetworkEnableDHCP(t *testing.T) {
ass := assert.New(t)
// file does not exist
_, err := GetNetworkInfo()
ass.EqualError(err, "failed to open network config: open test_interfaces: no such file or directory")
ass.NoError(ioutil.WriteFile(networkConfig, []byte(`auto lo
iface lo inet loopback
auto eth0
iface eth0 inet static
address 1.2.3.4
netmask 255.255.255.0
gateway 4.3.2.1`), os.ModePerm))
ass.NoError(NetworkEnableDHCP())
data, err := ioutil.ReadFile(networkConfig)
ass.NoError(err)
ass.Equal(`auto lo
iface lo inet loopback
auto eth0
iface eth0 inet dhcp
`, string(data))
_ = os.Remove(networkConfig)
}
func TestNetworkSetStatic(t *testing.T) {
ass := assert.New(t)
// file does not exist
_, err := GetNetworkInfo()
ass.EqualError(err, "failed to open network config: open test_interfaces: no such file or directory")
ass.NoError(ioutil.WriteFile(networkConfig, []byte(`auto lo
iface lo inet loopback
auto eth0
iface eth0 inet dhcp`), os.ModePerm))
ass.NoError(NetworkSetStatic("1.2.3.4", "255.255.255.0", "4.3.2.1"))
data, err := ioutil.ReadFile(networkConfig)
ass.NoError(err)
ass.Equal(`auto lo
iface lo inet loopback
auto eth0
iface eth0 inet static
address 1.2.3.4
netmask 255.255.255.0
gateway 4.3.2.1
`, string(data))
_ = os.Remove(networkConfig)
}

6
resources/build.sh
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@ -99,7 +99,7 @@ EOF
# prepare network
chroot_exec rc-update add networking default
ln -fs /data/etc/interfaces ${ROOTFS_PATH}/etc/network/interfaces
ln -fs /data/etc/network/interfaces ${ROOTFS_PATH}/etc/network/interfaces
# run local before network -> local brings up the interface
sed -i '/^\tneed/ s/$/ local/' ${ROOTFS_PATH}/etc/init.d/networking
@ -200,8 +200,8 @@ root_pw=\$(mkpasswd -m sha-512 -s "${DEFAULT_ROOT_PASSWORD}")
echo "root:\${root_pw}:0:0:::::" > /data/etc/shadow
# interface
if [ ! -f /data/etc/interfaces ]; then
cat > /data/etc/interfaces <<EOF2
if [ ! -f /data/etc/network/interfaces ]; then
cat > /data/etc/network/interfaces <<EOF2
auto lo
iface lo inet loopback

2
resources/scripts/ab_active
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@ -1,4 +1,4 @@
#!/bin/bash
#!/bin/bash
set -e
# get current partition index

2
resources/scripts/ab_flash
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@ -1,4 +1,4 @@
#!/bin/bash
#!/bin/bash
set -e
image_file=$1

2
resources/uboot.c
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@ -71,7 +71,7 @@ int main(int argc, char* argv[]) {
data[1] = 0;
// boot partition
data[2] = 2; // A=2, B=3
data[2] = 2; // A=1, B=2
}
// handle commands

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system.go Normal file
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package alpine_builder
import (
"fmt"
"io/ioutil"
"os"
"os/exec"
"strings"
"github.com/GehirnInc/crypt"
_ "github.com/GehirnInc/crypt/sha256_crypt"
)
// system configurations
var systemShadow = "/data/etc/shadow"
var systemDropbearConfig = "/data/etc/dropbear/dropbear.conf"
var systemDropbearRestart = "rc-service dropbear start"
var systemShutdown = "poweroff"
var systemReboot = "reboot"
// SystemSetRootPassword update shadow file
func SystemSetRootPassword(password string) error {
crypter := crypt.SHA256.New()
// generate password line
hash, err := crypter.Generate([]byte(password), nil)
if err != nil {
return fmt.Errorf("failed to generate hash: %w", err)
}
line := fmt.Sprintf("root:%s:0:0:::::", hash)
// write shadow file
return ioutil.WriteFile(systemShadow, []byte(line), os.ModePerm)
}
// SystemEnableSSH server
func SystemEnableSSH() error {
err := ioutil.WriteFile(systemDropbearConfig, []byte("DROPBEAR_OPTS=\"\""), os.ModePerm)
if err != nil {
return fmt.Errorf("failed to write ssh config: %w", err)
}
cmdSplit := strings.Split(systemDropbearRestart, " ")
cmd := exec.Command(cmdSplit[0], cmdSplit[1:]...)
err = cmd.Run()
if err != nil {
return fmt.Errorf("failed to restart ssh server: %w", err)
}
return nil
}
// SystemDisableSSH server
func SystemDisableSSH() error {
err := ioutil.WriteFile(systemDropbearConfig, []byte("DROPBEAR_OPTS=\"-p 127.0.0.1:22\""), os.ModePerm)
if err != nil {
return fmt.Errorf("failed to write ssh config: %w", err)
}
cmdSplit := strings.Split(systemDropbearRestart, " ")
cmd := exec.Command(cmdSplit[0], cmdSplit[1:]...)
err = cmd.Run()
if err != nil {
return fmt.Errorf("failed to restart ssh server: %w", err)
}
return nil
}
// SystemShutdown start shutdown of system
func SystemShutdown() error {
cmd := exec.Command(systemShutdown)
err := cmd.Run()
if err != nil {
return fmt.Errorf("failed to start system shutdown: %w", err)
}
return nil
}
// SystemReboot start reboot of system
func SystemReboot() error {
cmd := exec.Command(systemReboot)
err := cmd.Run()
if err != nil {
return fmt.Errorf("failed to start system reboot: %w", err)
}
return nil
}

75
system_test.go Normal file
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package alpine_builder
import (
"io/ioutil"
"os"
"strings"
"testing"
"github.com/GehirnInc/crypt"
_ "github.com/GehirnInc/crypt/sha256_crypt"
"github.com/stretchr/testify/assert"
)
func init() {
systemShadow = "test_shadow"
systemDropbearConfig = "test_dropbear"
systemDropbearRestart = "restart_dropbear_command"
systemReboot = "reboot_command"
systemShutdown = "shutdown_command"
}
func TestSystemSetRootPassword(t *testing.T) {
ass := assert.New(t)
ass.NoError(SystemSetRootPassword("password"))
data, err := ioutil.ReadFile(systemShadow)
ass.NoError(err)
hash := strings.Split(string(data), ":")[1]
crypter := crypt.SHA256.New()
ass.NoError(crypter.Verify(hash, []byte("password")))
_ = os.Remove(systemShadow)
}
func TestSystemEnableSSH(t *testing.T) {
ass := assert.New(t)
ass.EqualError(SystemEnableSSH(), "failed to restart ssh server: exec: \"restart_dropbear_command\": executable file not found in $PATH")
data, err := ioutil.ReadFile(systemDropbearConfig)
ass.NoError(err)
ass.Equal("DROPBEAR_OPTS=\"\"", string(data))
_ = os.Remove(systemDropbearConfig)
}
func TestSystemDisableSSH(t *testing.T) {
ass := assert.New(t)
ass.EqualError(SystemDisableSSH(), "failed to restart ssh server: exec: \"restart_dropbear_command\": executable file not found in $PATH")
data, err := ioutil.ReadFile(systemDropbearConfig)
ass.NoError(err)
ass.Equal("DROPBEAR_OPTS=\"-p 127.0.0.1:22\"", string(data))
_ = os.Remove(systemDropbearConfig)
}
func TestSystemReboot(t *testing.T) {
ass := assert.New(t)
ass.EqualError(SystemReboot(),
"failed to start system reboot: exec: \"reboot_command\": executable file not found in $PATH")
}
func TestSystemShutdown(t *testing.T) {
ass := assert.New(t)
ass.EqualError(SystemShutdown(),
"failed to start system shutdown: exec: \"shutdown_command\": executable file not found in $PATH")
}

143
update.go Normal file
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package alpine_builder
import (
"compress/gzip"
"encoding/binary"
"errors"
"fmt"
"hash/crc32"
"io"
"io/ioutil"
"log"
"os"
"os/exec"
)
var ubootFile = "/uboot/uboot.dat"
var ubootRemountRW = "mount -o remount,rw /uboot"
var ubootRemountRO = "mount -o remount,ro /uboot"
var rootPartitionA = "/dev/mmcblk0p1"
var rootPartitionB = "/dev/mmcblk0p2"
// loadUbootDat file to byte array
func loadUbootDat() ([]byte, error) {
defaultData := make([]byte, 1024)
defaultData[0] = 1 // file version
defaultData[1] = 0 // boot counter
defaultData[2] = 1 // boot partition A=1, B=2
data, err := ioutil.ReadFile(ubootFile)
if err != nil {
return defaultData, fmt.Errorf("failed to open file: %w", err)
}
// invalid dat file?
if len(data) < 1024 {
return defaultData, errors.New("invalid dat file -> fallback to defaults")
}
crc := binary.LittleEndian.Uint32(data[1020:])
bla := crc32.ChecksumIEEE(data[:1020])
if crc != bla {
return defaultData, errors.New("invalid crc -> fallback to defaults")
}
return data, nil
}
// saveUbootDat from byte array
func saveUbootDat(data []byte) error {
// update crc
binary.LittleEndian.PutUint32(data[1020:],
crc32.ChecksumIEEE(data[:1020]))
// remount boot partition - writable
cmd := exec.Command(ubootRemountRW)
err := cmd.Run()
if err != nil {
return fmt.Errorf("failed to remount RW: %w", err)
}
// update uboot dat file
err = ioutil.WriteFile(ubootFile, data[:1024], os.ModePerm)
if err != nil {
return fmt.Errorf("failed write uboot dat: %w", err)
}
// remount boot partition - readonly
cmd = exec.Command(ubootRemountRO)
err = cmd.Run()
if err != nil {
return fmt.Errorf("failed to remount RO: %w", err)
}
return nil
}
// UBootResetCounter to 0
func UBootResetCounter() error {
data, _ := loadUbootDat()
data[1] = 0
return saveUbootDat(data)
}
// UBootActive returns the active partition. A=1, B=2
func UBootActive() uint8 {
data, _ := loadUbootDat()
return data[2]
}
// UBootSetActive sets the active partition. A=1, B=2
func UBootSetActive(active uint8) error {
data, _ := loadUbootDat()
if active == 1 {
data[2] = 1
} else {
data[2] = 2
}
return saveUbootDat(data)
}
// UpdateSystem with the given image
func UpdateSystem(image string) error {
data, _ := loadUbootDat()
rootPart := rootPartitionA
if data[2] == 1 {
rootPart = rootPartitionB
}
// open image file
inFile, err := os.Open(image)
if err != nil {
log.Fatal(err)
}
defer inFile.Close()
// decompress image
inDecompress, err := gzip.NewReader(inFile)
if err != nil {
log.Fatal(err)
}
defer inDecompress.Close()
// open root partition
out, err := os.OpenFile(rootPart,
os.O_WRONLY|os.O_TRUNC|os.O_SYNC, os.ModePerm)
if err != nil {
log.Fatal(err)
}
defer out.Close()
// write update
_, err = io.Copy(out, inDecompress)
if err != nil {
log.Fatal(err)
}
// switch active partition
if data[2] == 1 {
return UBootSetActive(2)
} else {
return UBootSetActive(1)
}
}

179
update_test.go Normal file
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@ -0,0 +1,179 @@
package alpine_builder
import (
"bytes"
"compress/gzip"
"crypto/rand"
"encoding/binary"
"io"
"io/ioutil"
"os"
"testing"
"github.com/stretchr/testify/assert"
)
func init() {
ubootFile = "test_uboot"
ubootRemountRW = "true"
ubootRemountRO = "true"
rootPartitionA = "test_rootA"
rootPartitionB = "test_rootB"
}
func TestLoadUbootDat(t *testing.T) {
ass := assert.New(t)
// file missing
data, err := loadUbootDat()
ass.EqualError(err, "failed to open file: open test_uboot: no such file or directory")
ass.Equal([]byte{1, 0, 1}, data[:3])
// file with invalid data
ass.NoError(ioutil.WriteFile(ubootFile, []byte{}, os.ModePerm))
data, err = loadUbootDat()
ass.EqualError(err, "invalid dat file -> fallback to defaults")
ass.Equal([]byte{1, 0, 1}, data[:3])
// file with invalid CRC
testData := make([]byte, 1024)
testData[0] = 1
testData[1] = 2
testData[2] = 2
ass.NoError(ioutil.WriteFile(ubootFile, testData, os.ModePerm))
data, err = loadUbootDat()
ass.EqualError(err, "invalid crc -> fallback to defaults")
ass.Equal([]byte{1, 0, 1}, data[:3])
// file with valid CRC
binary.LittleEndian.PutUint32(testData[1020:], 0x982E8B7A)
ass.NoError(ioutil.WriteFile(ubootFile, testData, os.ModePerm))
data, err = loadUbootDat()
ass.NoError(err)
ass.Equal(testData, data)
_ = os.Remove(ubootFile)
}
func TestSaveUbootDat(t *testing.T) {
ass := assert.New(t)
testData := make([]byte, 1024)
testData[0] = 1
testData[1] = 2
testData[2] = 2
ass.NoError(saveUbootDat(testData))
binary.LittleEndian.PutUint32(testData[1020:], 0x982E8B7A)
data, err := ioutil.ReadFile(ubootFile)
ass.NoError(err)
ass.Equal(testData, data)
_ = os.Remove(ubootFile)
}
func TestUBootResetCounter(t *testing.T) {
ass := assert.New(t)
// write test file
testData := make([]byte, 1024)
testData[0] = 1
testData[1] = 2
testData[2] = 2
binary.LittleEndian.PutUint32(testData[1020:], 0x982E8B7A)
ass.NoError(ioutil.WriteFile(ubootFile, testData, os.ModePerm))
ass.NoError(UBootResetCounter())
data, err := ioutil.ReadFile(ubootFile)
ass.NoError(err)
ass.Zero(data[1])
_ = os.Remove(ubootFile)
}
func TestUBootActive(t *testing.T) {
ass := assert.New(t)
// write test file
testData := make([]byte, 1024)
testData[0] = 1
testData[1] = 2
testData[2] = 2
binary.LittleEndian.PutUint32(testData[1020:], 0x982E8B7A)
ass.NoError(ioutil.WriteFile(ubootFile, testData, os.ModePerm))
ass.Equal(uint8(2), UBootActive())
_ = os.Remove(ubootFile)
}
func TestUBootSetActive(t *testing.T) {
ass := assert.New(t)
// write test file
testData := make([]byte, 1024)
testData[0] = 1
testData[1] = 2
testData[2] = 2
binary.LittleEndian.PutUint32(testData[1020:], 0x982E8B7A)
ass.NoError(ioutil.WriteFile(ubootFile, testData, os.ModePerm))
ass.NoError(UBootSetActive(1))
data, err := ioutil.ReadFile(ubootFile)
ass.NoError(err)
ass.Equal(uint8(1), data[2])
_ = os.Remove(ubootFile)
}
func TestUpdateSystem(t *testing.T) {
ass := assert.New(t)
// test uboot file
testData := make([]byte, 1024)
testData[0] = 1
testData[1] = 2
testData[2] = 2
binary.LittleEndian.PutUint32(testData[1020:], 0x982E8B7A)
ass.NoError(ioutil.WriteFile(ubootFile, testData, os.ModePerm))
// generate test image content
size := int64(1024 * 1024 * 5)
testImgData := make([]byte, size)
buffer := bytes.NewBuffer(testImgData)
_, err := io.CopyN(buffer, rand.Reader, size)
ass.NoError(err)
// write compressed image file
file, err := os.Create("test_image.gz")
ass.NoError(err)
gzipWriter := gzip.NewWriter(file)
_, err = gzipWriter.Write(testImgData)
ass.NoError(err)
ass.NoError(gzipWriter.Close())
ass.NoError(file.Close())
ass.NoError(ioutil.WriteFile(rootPartitionA, nil, os.ModePerm))
ass.NoError(UpdateSystem("test_image.gz"))
// check if image was written
data, err := ioutil.ReadFile(rootPartitionA)
ass.NoError(err)
ass.Equal(testImgData, data)
// check if uboot dat was updated
data, err = ioutil.ReadFile(ubootFile)
ass.NoError(err)
ass.Equal(uint8(1), data[2])
_ = os.Remove("test_image.gz")
_ = os.Remove(ubootFile)
_ = os.Remove(rootPartitionA)
_ = os.Remove(rootPartitionB)
}