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archive.go
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archive.go
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package imgsrc
import (
"archive/tar"
"bytes"
"io"
"os"
"path/filepath"
"strings"
"github.com/docker/docker/pkg/archive"
"github.com/docker/docker/pkg/fileutils"
"github.com/moby/buildkit/frontend/dockerfile/dockerignore"
"github.com/moby/patternmatcher"
"github.com/pkg/errors"
"github.com/superfly/flyctl/terminal"
)
type archiveOptions struct {
sourcePath string
exclusions []string
compressed bool
additions map[string][]byte
}
type ArchiveInfo struct {
SizeInBytes int
Content []byte
}
func CreateArchive(dockerfile, workingDir, ignoreFile string, compressed bool) (*ArchiveInfo, error) {
archiveOpts := archiveOptions{
sourcePath: workingDir,
compressed: compressed,
}
relativeDockerfilePath := ""
// copy dockerfile into the archive if it's outside the context dir
if !isPathInRoot(dockerfile, workingDir) {
dockerfileData, err := os.ReadFile(dockerfile)
if err != nil {
return nil, errors.Wrap(err, "error reading Dockerfile")
}
archiveOpts.additions = map[string][]byte{
"Dockerfile": dockerfileData,
}
} else {
p, err := filepath.Rel(workingDir, dockerfile)
if err != nil {
return nil, err
}
relativeDockerfilePath = filepath.ToSlash(p)
}
excludes, err := readDockerignore(workingDir, ignoreFile, relativeDockerfilePath)
if err != nil {
return nil, errors.Wrap(err, "error reading .dockerignore")
}
archiveOpts.exclusions = excludes
r, err := archiveDirectory(archiveOpts)
if err != nil {
return nil, err
}
contentBuf := new(bytes.Buffer)
contentBuf.ReadFrom(r)
content := contentBuf.Bytes()
archiveInfo := &ArchiveInfo{
SizeInBytes: len(content),
Content: content,
}
return archiveInfo, err
}
func archiveDirectory(options archiveOptions) (io.ReadCloser, error) {
opts := &archive.TarOptions{
ExcludePatterns: options.exclusions,
}
if options.compressed && len(options.additions) == 0 {
opts.Compression = archive.Gzip
}
sourcePath, err := fileutils.ReadSymlinkedDirectory(options.sourcePath)
if err != nil {
return nil, err
}
r, err := archive.TarWithOptions(sourcePath, opts)
if err != nil {
return nil, err
}
if options.additions != nil {
mods := map[string]archive.TarModifierFunc{}
for name, contents := range options.additions {
mods[name] = func(path string, header *tar.Header, content io.Reader) (*tar.Header, []byte, error) {
newHeader := &tar.Header{
Name: name,
Size: int64(len(contents)),
}
return newHeader, contents, nil
}
}
r = archive.ReplaceFileTarWrapper(r, mods)
}
return r, nil
}
func readDockerignore(workingDir, ignoreFile, relativeDockerfilePath string) ([]string, error) {
if ignoreFile == "" {
ignoreFile = filepath.Join(workingDir, ".dockerignore")
}
file, err := os.Open(ignoreFile)
if os.IsNotExist(err) {
// ignore fly.toml by default if no dockerignore file is provided
return []string{"fly.toml"}, nil
} else if err != nil {
return nil, err
}
defer func() {
err := file.Close()
if err != nil {
terminal.Debugf("error closing dockerignore %s: %v\n", ignoreFile, err)
}
}()
return parseDockerignore(file, relativeDockerfilePath)
}
func parseDockerignore(r io.Reader, dockerfile string) ([]string, error) {
excludes, err := dockerignore.ReadAll(r)
if err != nil {
return nil, err
}
if match, _ := patternmatcher.Matches(".dockerignore", excludes); match {
excludes = append(excludes, "!.dockerignore")
}
if dockerfile != "" {
if match, _ := patternmatcher.Matches(dockerfile, excludes); match {
excludes = append(excludes, "!"+dockerfile)
}
} else {
if match, _ := patternmatcher.Matches("Dockerfile", excludes); match {
excludes = append(excludes, "![Dd]ockerfile")
} else if match, _ := patternmatcher.Matches("dockerfile", excludes); match {
excludes = append(excludes, "![Dd]ockerfile")
}
}
return excludes, nil
}
func isPathInRoot(target, rootDir string) bool {
rootDir, _ = filepath.Abs(rootDir)
if !filepath.IsAbs(target) {
target = filepath.Join(rootDir, target)
}
rel, err := filepath.Rel(rootDir, target)
if err != nil {
return false
}
return !strings.HasPrefix(filepath.ToSlash(rel), "../")
}