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package imagebuilder
import (
"bytes"
"fmt"
"io/ioutil"
"log"
"os"
"path/filepath"
"runtime"
"strconv"
"strings"
docker "github.com/fsouza/go-dockerclient"
buildkitparser "github.com/moby/buildkit/frontend/dockerfile/parser"
"github.com/openshift/imagebuilder/dockerfile/command"
"github.com/openshift/imagebuilder/dockerfile/parser"
)
// Copy defines a copy operation required on the container.
type Copy struct {
// If true, this is a copy from the file system to the container. If false,
// the copy is from the context.
FromFS bool
// If set, this is a copy from the named stage or image to the container.
From string
Src []string
Dest string
Download bool
// If set, the owner:group for the destination. This value is passed
// to the executor for handling.
Chown string
Chmod string
// If set, a checksum which the source must match, or be rejected.
Checksum string
// Additional files which need to be created by executor for this
// instruction.
Files []File
// If set, when the source is a URL for a remote Git repository,
// refrain from stripping out the .git subdirectory after cloning it.
KeepGitDir bool
// If set, instead of adding these items to the rootfs and picking them
// up as part of a subsequent diff generation, build an archive of them
// and include it as an independent layer.
Link bool
// If set, preserve leading directories in the paths of items being
// copied, relative to either the top of the build context, or to the
// "pivot point", a location in the source path marked by a path
// component named "." (i.e., where "/./" occurs in the path).
Parents bool
// Exclusion patterns, a la .dockerignore, relative to either the top
// of a directory tree being copied, or the "pivot point", a location
// in the source path marked by a path component named ".".
Excludes []string
}
// File defines if any additional file needs to be created
// by the executor instruction so that specified command
// can execute/copy the created file inside the build container.
type File struct {
Name string // Name of the new file.
Data string // Content of the file.
}
// Run defines a run operation required in the container.
type Run struct {
Shell bool
Args []string
// Mounts are mounts specified through the --mount flag inside the Containerfile
Mounts []string
// Network specifies the network mode to run the container with
Network string
// Additional files which need to be created by executor for this
// instruction.
Files []File
}
type Executor interface {
Preserve(path string) error
// EnsureContainerPath should ensure that the directory exists, creating any components required
EnsureContainerPath(path string) error
// EnsureContainerPathAs should ensure that the directory exists, creating any components required
// with the specified owner and mode, if either is specified
EnsureContainerPathAs(path, user string, mode *os.FileMode) error
Copy(excludes []string, copies ...Copy) error
Run(run Run, config docker.Config) error
UnrecognizedInstruction(step *Step) error
}
type logExecutor struct{}
func (logExecutor) Preserve(path string) error {
log.Printf("PRESERVE %s", path)
return nil
}
func (logExecutor) EnsureContainerPath(path string) error {
log.Printf("ENSURE %s", path)
return nil
}
func (logExecutor) EnsureContainerPathAs(path, user string, mode *os.FileMode) error {
if mode != nil {
log.Printf("ENSURE %s AS %q with MODE=%q", path, user, *mode)
} else {
log.Printf("ENSURE %s AS %q", path, user)
}
return nil
}
func (logExecutor) Copy(excludes []string, copies ...Copy) error {
for _, c := range copies {
log.Printf("COPY %v -> %s (from:%s download:%t), chown: %s, chmod %s, checksum: %s", c.Src, c.Dest, c.From, c.Download, c.Chown, c.Chmod, c.Checksum)
}
return nil
}
func (logExecutor) Run(run Run, config docker.Config) error {
log.Printf("RUN %v %v %t (%v)", run.Args, run.Mounts, run.Shell, config.Env)
return nil
}
func (logExecutor) UnrecognizedInstruction(step *Step) error {
log.Printf("Unknown instruction: %s", strings.ToUpper(step.Command))
return nil
}
type noopExecutor struct{}
func (noopExecutor) Preserve(path string) error {
return nil
}
func (noopExecutor) EnsureContainerPath(path string) error {
return nil
}
func (noopExecutor) EnsureContainerPathAs(path, user string, mode *os.FileMode) error {
return nil
}
func (noopExecutor) Copy(excludes []string, copies ...Copy) error {
return nil
}
func (noopExecutor) Run(run Run, config docker.Config) error {
return nil
}
func (noopExecutor) UnrecognizedInstruction(step *Step) error {
return nil
}
type VolumeSet []string
func (s *VolumeSet) Add(path string) bool {
if path == "/" {
set := len(*s) != 1 || (*s)[0] != ""
*s = []string{""}
return set
}
path = strings.TrimSuffix(path, "/")
var adjusted []string
for _, p := range *s {
if p == path || strings.HasPrefix(path, p+"/") {
return false
}
if strings.HasPrefix(p, path+"/") {
continue
}
adjusted = append(adjusted, p)
}
adjusted = append(adjusted, path)
*s = adjusted
return true
}
func (s VolumeSet) Has(path string) bool {
if path == "/" {
return len(s) == 1 && s[0] == ""
}
path = strings.TrimSuffix(path, "/")
for _, p := range s {
if p == path {
return true
}
}
return false
}
func (s VolumeSet) Covers(path string) bool {
if path == "/" {
return len(s) == 1 && s[0] == ""
}
path = strings.TrimSuffix(path, "/")
for _, p := range s {
if p == path || strings.HasPrefix(path, p+"/") {
return true
}
}
return false
}
var (
LogExecutor = logExecutor{}
NoopExecutor = noopExecutor{}
)
type Stages []Stage
func (stages Stages) ByName(name string) (Stage, bool) {
for _, stage := range stages {
if stage.Name == name {
return stage, true
}
}
if i, err := strconv.Atoi(name); err == nil {
return stages.ByPosition(i)
}
return Stage{}, false
}
func (stages Stages) ByPosition(position int) (Stage, bool) {
for _, stage := range stages {
// stage.Position is expected to be the same as the unnamed
// index variable for this loop, but comparing to the Position
// field's value is easier to explain
if stage.Position == position {
return stage, true
}
}
return Stage{}, false
}
// Get just the target stage.
func (stages Stages) ByTarget(target string) (Stages, bool) {
if len(target) == 0 {
return stages, true
}
for i, stage := range stages {
if stage.Name == target {
return stages[i : i+1], true
}
}
if position, err := strconv.Atoi(target); err == nil {
for i, stage := range stages {
// stage.Position is expected to be the same as the unnamed
// index variable for this loop, but comparing to the Position
// field's value is easier to explain
if stage.Position == position {
return stages[i : i+1], true
}
}
}
return nil, false
}
// Get all the stages up to and including the target.
func (stages Stages) ThroughTarget(target string) (Stages, bool) {
if len(target) == 0 {
return stages, true
}
for i, stage := range stages {
if stage.Name == target {
return stages[0 : i+1], true
}
}
if position, err := strconv.Atoi(target); err == nil {
for i, stage := range stages {
// stage.Position is expected to be the same as the unnamed
// index variable for this loop, but comparing to the Position
// field's value is easier to explain
if stage.Position == position {
return stages[0 : i+1], true
}
}
}
return nil, false
}
type Stage struct {
Position int
Name string
Builder *Builder
Node *parser.Node
}
func NewStages(node *parser.Node, b *Builder) (Stages, error) {
var stages Stages
var headingArgs []string
if err := b.extractHeadingArgsFromNode(node); err != nil {
return stages, err
}
for k := range b.HeadingArgs {
headingArgs = append(headingArgs, k)
}
for i, root := range SplitBy(node, command.From) {
name, _ := extractNameFromNode(root.Children[0])
if len(name) == 0 {
name = strconv.Itoa(i)
}
filteredUserArgs := make(map[string]string)
for k, v := range b.UserArgs {
for _, a := range b.GlobalAllowedArgs {
if a == k {
filteredUserArgs[k] = v
}
}
}
userArgs := envMapAsSlice(filteredUserArgs)
userArgs = mergeEnv(envMapAsSlice(b.BuiltinArgDefaults), userArgs)
userArgs = mergeEnv(envMapAsSlice(builtinArgDefaults), userArgs)
userArgs = mergeEnv(envMapAsSlice(b.HeadingArgs), userArgs)
processedName, err := ProcessWord(name, userArgs)
if err != nil {
return nil, err
}
stages = append(stages, Stage{
Position: i,
Name: processedName,
Builder: b.builderForStage(headingArgs),
Node: root,
})
}
return stages, nil
}
func (b *Builder) extractHeadingArgsFromNode(node *parser.Node) error {
var args []*parser.Node
var children []*parser.Node
extract := true
for _, child := range node.Children {
if extract && child.Value == command.Arg {
args = append(args, child)
} else {
if child.Value == command.From {
extract = false
}
children = append(children, child)
}
}
// Set children equal to everything except the leading ARG nodes
node.Children = children
// Use a separate builder to evaluate the heading args
tempBuilder := NewBuilder(b.UserArgs)
// Evaluate all the heading arg commands
for _, c := range args {
step := tempBuilder.Step()
if err := step.Resolve(c); err != nil {
return err
}
if err := tempBuilder.Run(step, NoopExecutor, false); err != nil {
return err
}
}
// Add all of the defined heading args to the original builder's HeadingArgs map
for k, v := range tempBuilder.Args {
if _, ok := tempBuilder.AllowedArgs[k]; ok {
b.HeadingArgs[k] = v
}
}
return nil
}
func extractNameFromNode(node *parser.Node) (string, bool) {
if node.Value != command.From {
return "", false
}
n := node.Next
if n == nil || n.Next == nil {
return "", false
}
n = n.Next
if !strings.EqualFold(n.Value, "as") || n.Next == nil || len(n.Next.Value) == 0 {
return "", false
}
return n.Next.Value, true
}
func (b *Builder) builderForStage(globalArgsList []string) *Builder {
stageBuilder := newBuilderWithGlobalAllowedArgs(b.UserArgs, b.HeadingArgs, b.BuiltinArgDefaults, globalArgsList)
return stageBuilder
}
type Builder struct {
RunConfig docker.Config
Env []string
// Args contains values originally given to NewBuilder() or set due to
// ARG instructions in a stage, either with a default value provided,
// or with a default inherited from an ARG instruction in the header
Args map[string]string
// HeadingArgs contains the values for ARG instructions in the
// Dockerfile which occurred before the first FROM instruction, either
// with a default value provided as part of the ARG instruction, or
// expecting a value to be supplied in UserArgs via NewBuilder().
HeadingArgs map[string]string
// UserArgs includes a copy of the values that were passed to
// NewBuilder(), unmodified.
UserArgs map[string]string
CmdSet bool
Author string
// GlobalAllowedArgs are args which should be resolvable in a FROM
// instruction, either built-in and always available, or introduced by
// an ARG instruction in the header.
GlobalAllowedArgs []string
// AllowedArgs are args which should be resolvable in this stage,
// having been introduced by a previous ARG instruction in this stage.
AllowedArgs map[string]bool
Volumes VolumeSet
Excludes []string
PendingVolumes VolumeSet
PendingRuns []Run
PendingCopies []Copy
Warnings []string
// Raw platform string specified with `FROM --platform` of the stage
// It's up to the implementation or client to parse and use this field
Platform string
// Overrides for TARGET... and BUILD... values. TARGET... values are
// typically only necessary if the builder's target platform is not the
// same as the build platform.
BuiltinArgDefaults map[string]string
}
func NewBuilder(args map[string]string) *Builder {
return newBuilderWithGlobalAllowedArgs(args, nil, nil, []string{})
}
func newBuilderWithGlobalAllowedArgs(args, headingArgs, userBuiltinArgDefaults map[string]string, globalAllowedArgs []string) *Builder {
allowed := make(map[string]bool)
for k, v := range builtinAllowedBuildArgs {
allowed[k] = v
}
userArgs := make(map[string]string)
initialArgs := make(map[string]string)
for k, v := range args {
userArgs[k] = v
initialArgs[k] = v
}
var copiedGlobalAllowedArgs []string
if len(globalAllowedArgs) > 0 {
copiedGlobalAllowedArgs = append([]string{}, globalAllowedArgs...)
}
copiedHeadingArgs := make(map[string]string)
for k, v := range headingArgs {
copiedHeadingArgs[k] = v
}
copiedBuiltinArgDefaults := make(map[string]string)
for k, v := range builtinArgDefaults {
copiedBuiltinArgDefaults[k] = v
}
for k, v := range userBuiltinArgDefaults {
copiedBuiltinArgDefaults[k] = v
}
return &Builder{
Args: initialArgs,
UserArgs: userArgs,
HeadingArgs: copiedHeadingArgs,
AllowedArgs: allowed,
GlobalAllowedArgs: copiedGlobalAllowedArgs,
BuiltinArgDefaults: copiedBuiltinArgDefaults,
}
}
func ParseFile(path string) (*parser.Node, error) {
f, err := os.Open(path)
if err != nil {
return nil, err
}
defer f.Close()
return ParseDockerfile(f)
}
// Step creates a new step from the current state.
func (b *Builder) Step() *Step {
// Include build arguments in the table of variables that we'll use in
// Resolve(), but override them with values from the actual
// environment in case there's any conflict.
return &Step{Env: mergeEnv(b.Arguments(), mergeEnv(b.Env, b.RunConfig.Env))}
}
// Run executes a step, transforming the current builder and
// invoking any Copy or Run operations. noRunsRemaining is an
// optimization hint that allows the builder to avoid performing
// unnecessary work.
func (b *Builder) Run(step *Step, exec Executor, noRunsRemaining bool) error {
fn, ok := evaluateTable[step.Command]
if !ok {
return exec.UnrecognizedInstruction(step)
}
if err := fn(b, step.Args, step.Attrs, step.Flags, step.Original, step.Heredocs); err != nil {
return err
}
copies := b.PendingCopies
b.PendingCopies = nil
runs := b.PendingRuns
b.PendingRuns = nil
// Once a VOLUME is defined, future ADD/COPY instructions are
// all that may mutate that path. Instruct the executor to preserve
// the path. The executor must handle invalidating preserved info.
for _, path := range b.PendingVolumes {
if b.Volumes.Add(path) && !noRunsRemaining {
if err := exec.Preserve(path); err != nil {
return err
}
}
}
if err := exec.Copy(b.Excludes, copies...); err != nil {
return err
}
if len(b.RunConfig.WorkingDir) > 0 {
if err := exec.EnsureContainerPathAs(b.RunConfig.WorkingDir, b.RunConfig.User, nil); err != nil {
return err
}
}
for _, run := range runs {
config := b.Config()
config.Env = step.Env
if err := exec.Run(run, *config); err != nil {
return err
}
}
return nil
}
// RequiresStart returns true if a running container environment is necessary
// to invoke the provided commands
func (b *Builder) RequiresStart(node *parser.Node) bool {
for _, child := range node.Children {
if child.Value == command.Run {
return true
}
}
return false
}
// Config returns a snapshot of the current RunConfig intended for
// use with a container commit.
func (b *Builder) Config() *docker.Config {
config := b.RunConfig
if config.OnBuild == nil {
config.OnBuild = []string{}
}
if config.Entrypoint == nil {
config.Entrypoint = []string{}
}
config.Image = ""
return &config
}
// Arguments returns the currently active arguments.
func (b *Builder) Arguments() []string {
var envs []string
for key, val := range b.Args {
if _, ok := b.AllowedArgs[key]; ok {
envs = append(envs, fmt.Sprintf("%s=%s", key, val))
}
}
return envs
}
// ErrNoFROM is returned if the Dockerfile did not contain a FROM
// statement.
var ErrNoFROM = fmt.Errorf("no FROM statement found")
// From returns the image this dockerfile depends on, or an error
// if no FROM is found or if multiple FROM are specified. If a
// single from is found the passed node is updated with only
// the remaining statements. The builder's RunConfig.Image field
// is set to the first From found, or left unchanged if already
// set.
func (b *Builder) From(node *parser.Node) (string, error) {
if err := b.extractHeadingArgsFromNode(node); err != nil {
return "", err
}
children := SplitChildren(node, command.From)
switch {
case len(children) == 0:
return "", ErrNoFROM
case len(children) > 1:
return "", fmt.Errorf("multiple FROM statements are not supported")
default:
step := b.Step()
if err := step.Resolve(children[0]); err != nil {
return "", err
}
if err := b.Run(step, NoopExecutor, false); err != nil {
return "", err
}
return b.RunConfig.Image, nil
}
}
// FromImage updates the builder to use the provided image (resetting RunConfig
// and recording the image environment), and updates the node with any ONBUILD
// statements extracted from the parent image.
func (b *Builder) FromImage(image *docker.Image, node *parser.Node) error {
SplitChildren(node, command.From)
b.RunConfig = *image.Config
b.Env = mergeEnv(b.Env, b.RunConfig.Env)
b.RunConfig.Env = nil
// Check to see if we have a default PATH, note that windows won't
// have one as it's set by HCS
if runtime.GOOS != "windows" && !hasEnvName(b.Env, "PATH") {
b.RunConfig.Env = append(b.RunConfig.Env, "PATH="+defaultPathEnv)
}
// Join the image onbuild statements into node
if image.Config == nil || len(image.Config.OnBuild) == 0 {
return nil
}
extra, err := ParseDockerfile(bytes.NewBufferString(strings.Join(image.Config.OnBuild, "\n")))
if err != nil {
return err
}
for _, child := range extra.Children {
switch strings.ToUpper(child.Value) {
case "ONBUILD":
return fmt.Errorf("Chaining ONBUILD via `ONBUILD ONBUILD` isn't allowed")
case "MAINTAINER", "FROM":
return fmt.Errorf("%s isn't allowed as an ONBUILD trigger", child.Value)
}
}
node.Children = append(extra.Children, node.Children...)
// Since we've processed the OnBuild statements, clear them from the runconfig state.
b.RunConfig.OnBuild = nil
return nil
}
// SplitChildren removes any children with the provided value from node
// and returns them as an array. node.Children is updated.
func SplitChildren(node *parser.Node, value string) []*parser.Node {
var split []*parser.Node
var children []*parser.Node
for _, child := range node.Children {
if child.Value == value {
split = append(split, child)
} else {
children = append(children, child)
}
}
node.Children = children
return split
}
func SplitBy(node *parser.Node, value string) []*parser.Node {
var split []*parser.Node
var current *parser.Node
for _, child := range node.Children {
if current == nil || child.Value == value {
copied := *node
current = &copied
current.Children = nil
current.Next = nil
split = append(split, current)
}
current.Children = append(current.Children, child)
}
return split
}
// StepFunc is invoked with the result of a resolved step.
type StepFunc func(*Builder, []string, map[string]bool, []string, string, []buildkitparser.Heredoc) error
var evaluateTable = map[string]StepFunc{
command.Env: env,
command.Label: label,
command.Maintainer: maintainer,
command.Add: add,
command.Copy: dispatchCopy, // copy() is a go builtin
command.From: from,
command.Onbuild: onbuild,
command.Workdir: workdir,
command.Run: run,
command.Cmd: cmd,
command.Entrypoint: entrypoint,
command.Expose: expose,
command.Volume: volume,
command.User: user,
command.StopSignal: stopSignal,
command.Arg: arg,
command.Healthcheck: healthcheck,
command.Shell: shell,
}
// builtinAllowedBuildArgs is list of built-in allowed build args
var builtinAllowedBuildArgs = map[string]bool{
"HTTP_PROXY": true,
"http_proxy": true,
"HTTPS_PROXY": true,
"https_proxy": true,
"FTP_PROXY": true,
"ftp_proxy": true,
"NO_PROXY": true,
"no_proxy": true,
}
// ParseIgnore returns a list of the excludes in the specified path
// path should be a file with the .dockerignore format
// extracted from fsouza/go-dockerclient and modified to drop comments and
// empty lines.
func ParseIgnore(path string) ([]string, error) {
var excludes []string
ignores, err := ioutil.ReadFile(path)
if err != nil {
return excludes, err
}
for _, ignore := range strings.Split(string(ignores), "\n") {
if len(ignore) == 0 || ignore[0] == '#' {
continue
}
ignore = strings.Trim(ignore, "/")
if len(ignore) > 0 {
excludes = append(excludes, ignore)
}
}
return excludes, nil
}
// ParseDockerIgnore returns a list of the excludes in the .containerignore or .dockerignore file.
func ParseDockerignore(root string) ([]string, error) {
excludes, err := ParseIgnore(filepath.Join(root, ".containerignore"))
if err != nil && os.IsNotExist(err) {
excludes, err = ParseIgnore(filepath.Join(root, ".dockerignore"))
}
if err != nil && os.IsNotExist(err) {
return excludes, nil
}
return excludes, err
}
// ExportEnv creates an export statement for a shell that contains all of the
// provided environment.
func ExportEnv(env []string) string {
if len(env) == 0 {
return ""
}
out := "export"
for _, e := range env {
if len(e) == 0 {
continue
}
out += " " + BashQuote(e)
}
return out + "; "
}
// BashQuote escapes the provided string and surrounds it with double quotes.
// TODO: verify that these are all we have to escape.
func BashQuote(env string) string {
out := []rune{'"'}
for _, r := range env {
switch r {
case '$', '\\', '"':
out = append(out, '\\', r)
default:
out = append(out, r)
}
}
out = append(out, '"')
return string(out)
}
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