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add.go
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add.go
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package buildah
import (
"io"
"net/http"
"net/url"
"os"
"path"
"path/filepath"
"strings"
"syscall"
"time"
"github.com/containers/buildah/pkg/chrootuser"
"github.com/containers/buildah/util"
"github.com/containers/storage/pkg/archive"
"github.com/containers/storage/pkg/fileutils"
"github.com/containers/storage/pkg/idtools"
"github.com/containers/storage/pkg/system"
"github.com/opencontainers/runtime-spec/specs-go"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
// AddAndCopyOptions holds options for add and copy commands.
type AddAndCopyOptions struct {
// Chown is a spec for the user who should be given ownership over the
// newly-added content, potentially overriding permissions which would
// otherwise match those of local files and directories being copied.
Chown string
// All of the data being copied will pass through Hasher, if set.
// If the sources are URLs or files, their contents will be passed to
// Hasher.
// If the sources include directory trees, Hasher will be passed
// tar-format archives of the directory trees.
Hasher io.Writer
// Excludes is the contents of the .dockerignore file
Excludes []string
// The base directory for Excludes and data to copy in
ContextDir string
// ID mapping options to use when contents to be copied are part of
// another container, and need ownerships to be mapped from the host to
// that container's values before copying them into the container.
IDMappingOptions *IDMappingOptions
}
// addURL copies the contents of the source URL to the destination. This is
// its own function so that deferred closes happen after we're done pulling
// down each item of potentially many.
func addURL(destination, srcurl string, owner idtools.IDPair, hasher io.Writer) error {
logrus.Debugf("saving %q to %q", srcurl, destination)
resp, err := http.Get(srcurl)
if err != nil {
return errors.Wrapf(err, "error getting %q", srcurl)
}
defer resp.Body.Close()
f, err := os.Create(destination)
if err != nil {
return errors.Wrapf(err, "error creating %q", destination)
}
if err = f.Chown(owner.UID, owner.GID); err != nil {
return errors.Wrapf(err, "error setting owner of %q to %d:%d", destination, owner.UID, owner.GID)
}
if last := resp.Header.Get("Last-Modified"); last != "" {
if mtime, err2 := time.Parse(time.RFC1123, last); err2 != nil {
logrus.Debugf("error parsing Last-Modified time %q: %v", last, err2)
} else {
defer func() {
if err3 := os.Chtimes(destination, time.Now(), mtime); err3 != nil {
logrus.Debugf("error setting mtime on %q to Last-Modified time %q: %v", destination, last, err3)
}
}()
}
}
defer f.Close()
bodyReader := io.Reader(resp.Body)
if hasher != nil {
bodyReader = io.TeeReader(bodyReader, hasher)
}
n, err := io.Copy(f, bodyReader)
if err != nil {
return errors.Wrapf(err, "error reading contents for %q from %q", destination, srcurl)
}
if resp.ContentLength >= 0 && n != resp.ContentLength {
return errors.Errorf("error reading contents for %q from %q: wrong length (%d != %d)", destination, srcurl, n, resp.ContentLength)
}
if err := f.Chmod(0600); err != nil {
return errors.Wrapf(err, "error setting permissions on %q", destination)
}
return nil
}
// Add copies the contents of the specified sources into the container's root
// filesystem, optionally extracting contents of local files that look like
// non-empty archives.
func (b *Builder) Add(destination string, extract bool, options AddAndCopyOptions, source ...string) error {
excludes, err := dockerIgnoreMatcher(options.Excludes, options.ContextDir)
if err != nil {
return err
}
mountPoint, err := b.Mount(b.MountLabel)
if err != nil {
return err
}
defer func() {
if err2 := b.Unmount(); err2 != nil {
logrus.Errorf("error unmounting container: %v", err2)
}
}()
// Find out which user (and group) the destination should belong to.
user, _, err := b.user(mountPoint, options.Chown)
if err != nil {
return err
}
containerOwner := idtools.IDPair{UID: int(user.UID), GID: int(user.GID)}
hostUID, hostGID, err := util.GetHostIDs(b.IDMappingOptions.UIDMap, b.IDMappingOptions.GIDMap, user.UID, user.GID)
if err != nil {
return err
}
hostOwner := idtools.IDPair{UID: int(hostUID), GID: int(hostGID)}
dest := mountPoint
if destination != "" && filepath.IsAbs(destination) {
dir := filepath.Dir(destination)
if dir != "." && dir != "/" {
if err = idtools.MkdirAllAndChownNew(filepath.Join(dest, dir), 0755, hostOwner); err != nil {
return errors.Wrapf(err, "error creating directory %q", filepath.Join(dest, dir))
}
}
dest = filepath.Join(dest, destination)
} else {
if err = idtools.MkdirAllAndChownNew(filepath.Join(dest, b.WorkDir()), 0755, hostOwner); err != nil {
return errors.Wrapf(err, "error creating directory %q", filepath.Join(dest, b.WorkDir()))
}
dest = filepath.Join(dest, b.WorkDir(), destination)
}
// If the destination was explicitly marked as a directory by ending it
// with a '/', create it so that we can be sure that it's a directory,
// and any files we're copying will be placed in the directory.
if len(destination) > 0 && destination[len(destination)-1] == os.PathSeparator {
if err = idtools.MkdirAllAndChownNew(dest, 0755, hostOwner); err != nil {
return errors.Wrapf(err, "error creating directory %q", dest)
}
}
// Make sure the destination's parent directory is usable.
if destpfi, err2 := os.Stat(filepath.Dir(dest)); err2 == nil && !destpfi.IsDir() {
return errors.Errorf("%q already exists, but is not a subdirectory)", filepath.Dir(dest))
}
// Now look at the destination itself.
destfi, err := os.Stat(dest)
if err != nil {
if !os.IsNotExist(err) {
return errors.Wrapf(err, "couldn't determine what %q is", dest)
}
destfi = nil
}
if len(source) > 1 && (destfi == nil || !destfi.IsDir()) {
return errors.Errorf("destination %q is not a directory", dest)
}
copyFileWithTar := b.copyFileWithTar(options.IDMappingOptions, &containerOwner, options.Hasher)
copyWithTar := b.copyWithTar(options.IDMappingOptions, &containerOwner, options.Hasher)
untarPath := b.untarPath(nil, options.Hasher)
err = addHelper(excludes, extract, dest, destfi, hostOwner, options, copyFileWithTar, copyWithTar, untarPath, source...)
if err != nil {
return err
}
return nil
}
// user returns the user (and group) information which the destination should belong to.
func (b *Builder) user(mountPoint string, userspec string) (specs.User, string, error) {
if userspec == "" {
userspec = b.User()
}
uid, gid, homeDir, err := chrootuser.GetUser(mountPoint, userspec)
u := specs.User{
UID: uid,
GID: gid,
Username: userspec,
}
if !strings.Contains(userspec, ":") {
groups, err2 := chrootuser.GetAdditionalGroupsForUser(mountPoint, uint64(u.UID))
if err2 != nil {
if errors.Cause(err2) != chrootuser.ErrNoSuchUser && err == nil {
err = err2
}
} else {
u.AdditionalGids = groups
}
}
return u, homeDir, err
}
// dockerIgnoreMatcher returns a matcher based on the contents of the .dockerignore file under contextDir
func dockerIgnoreMatcher(lines []string, contextDir string) (*fileutils.PatternMatcher, error) {
// if there's no context dir, there's no .dockerignore file to consult
if contextDir == "" {
return nil, nil
}
patterns := []string{".dockerignore"}
for _, ignoreSpec := range lines {
ignoreSpec = strings.TrimSpace(ignoreSpec)
// ignore comments passed back from .dockerignore
if ignoreSpec == "" || ignoreSpec[0] == '#' {
continue
}
// if the spec starts with '!' it means the pattern
// should be included. make a note so that we can move
// it to the front of the updated pattern
includeFlag := ""
if strings.HasPrefix(ignoreSpec, "!") {
includeFlag = "!"
ignoreSpec = ignoreSpec[1:]
}
if ignoreSpec == "" {
continue
}
patterns = append(patterns, includeFlag+filepath.Join(contextDir, ignoreSpec))
}
// if there are no patterns, save time by not constructing the object
if len(patterns) == 0 {
return nil, nil
}
// return a matcher object
matcher, err := fileutils.NewPatternMatcher(patterns)
if err != nil {
return nil, errors.Wrapf(err, "error creating file matcher using patterns %v", patterns)
}
return matcher, nil
}
func addHelper(excludes *fileutils.PatternMatcher, extract bool, dest string, destfi os.FileInfo, hostOwner idtools.IDPair, options AddAndCopyOptions, copyFileWithTar, copyWithTar, untarPath func(src, dest string) error, source ...string) error {
for _, src := range source {
if strings.HasPrefix(src, "http://") || strings.HasPrefix(src, "https://") {
// We assume that source is a file, and we're copying
// it to the destination. If the destination is
// already a directory, create a file inside of it.
// Otherwise, the destination is the file to which
// we'll save the contents.
url, err := url.Parse(src)
if err != nil {
return errors.Wrapf(err, "error parsing URL %q", src)
}
d := dest
if destfi != nil && destfi.IsDir() {
d = filepath.Join(dest, path.Base(url.Path))
}
if err = addURL(d, src, hostOwner, options.Hasher); err != nil {
return err
}
continue
}
glob, err := filepath.Glob(src)
if err != nil {
return errors.Wrapf(err, "invalid glob %q", src)
}
if len(glob) == 0 {
return errors.Wrapf(syscall.ENOENT, "no files found matching %q", src)
}
for _, gsrc := range glob {
esrc, err := filepath.EvalSymlinks(gsrc)
if err != nil {
return errors.Wrapf(err, "error evaluating symlinks %q", gsrc)
}
srcfi, err := os.Stat(esrc)
if err != nil {
return errors.Wrapf(err, "error reading %q", esrc)
}
if srcfi.IsDir() {
// The source is a directory, so copy the contents of
// the source directory into the target directory. Try
// to create it first, so that if there's a problem,
// we'll discover why that won't work.
if err = idtools.MkdirAllAndChownNew(dest, 0755, hostOwner); err != nil {
return errors.Wrapf(err, "error creating directory %q", dest)
}
logrus.Debugf("copying %q to %q", esrc+string(os.PathSeparator)+"*", dest+string(os.PathSeparator)+"*")
if excludes == nil || !excludes.Exclusions() {
if err = copyWithTar(esrc, dest); err != nil {
return errors.Wrapf(err, "error copying %q to %q", esrc, dest)
}
continue
}
err := filepath.Walk(esrc, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
skip, err := excludes.Matches(path)
if err != nil {
return errors.Wrapf(err, "error checking if %s is an excluded path", path)
}
if skip {
return nil
}
// combine the filename with the dest directory
fpath, err := filepath.Rel(esrc, path)
if err != nil {
return errors.Wrapf(err, "error converting %s to a path relative to %s", path, esrc)
}
mtime := info.ModTime()
atime := mtime
times := []syscall.Timespec{
syscall.NsecToTimespec(atime.Unix()),
syscall.NsecToTimespec(mtime.Unix()),
}
if info.IsDir() {
return addHelperDirectory(esrc, path, filepath.Join(dest, fpath), info, hostOwner, times)
}
if info.Mode()&os.ModeSymlink == os.ModeSymlink {
return addHelperSymlink(path, filepath.Join(dest, fpath), hostOwner, times)
}
if !info.Mode().IsRegular() {
return errors.Errorf("error copying %q to %q: source is not a regular file; file mode is %s", path, dest, info.Mode())
}
if err = copyFileWithTar(path, filepath.Join(dest, fpath)); err != nil {
return errors.Wrapf(err, "error copying %q to %q", path, dest)
}
return nil
})
if err != nil {
return err
}
continue
}
if !extract || !archive.IsArchivePath(esrc) {
// This source is a file, and either it's not an
// archive, or we don't care whether or not it's an
// archive.
d := dest
if destfi != nil && destfi.IsDir() {
d = filepath.Join(dest, filepath.Base(gsrc))
}
// Copy the file, preserving attributes.
logrus.Debugf("copying %q to %q", esrc, d)
if err = copyFileWithTar(esrc, d); err != nil {
return errors.Wrapf(err, "error copying %q to %q", esrc, d)
}
continue
}
// We're extracting an archive into the destination directory.
logrus.Debugf("extracting contents of %q into %q", esrc, dest)
if err = untarPath(esrc, dest); err != nil {
return errors.Wrapf(err, "error extracting %q into %q", esrc, dest)
}
}
}
return nil
}
func addHelperDirectory(esrc, path, dest string, info os.FileInfo, hostOwner idtools.IDPair, times []syscall.Timespec) error {
if err := idtools.MkdirAllAndChownNew(dest, info.Mode().Perm(), hostOwner); err != nil {
// discard only EEXIST on the top directory, which would have been created earlier in the caller
if !os.IsExist(err) || path != esrc {
return errors.Errorf("error creating directory %q", dest)
}
}
if err := idtools.SafeLchown(dest, hostOwner.UID, hostOwner.GID); err != nil {
return errors.Wrapf(err, "error setting owner of directory %q to %d:%d", dest, hostOwner.UID, hostOwner.GID)
}
if err := system.LUtimesNano(dest, times); err != nil {
return errors.Wrapf(err, "error setting dates on directory %q", dest)
}
return nil
}
func addHelperSymlink(src, dest string, hostOwner idtools.IDPair, times []syscall.Timespec) error {
linkContents, err := os.Readlink(src)
if err != nil {
return errors.Wrapf(err, "error reading contents of symbolic link at %q", src)
}
if err = os.Symlink(linkContents, dest); err != nil {
if !os.IsExist(err) {
return errors.Wrapf(err, "error creating symbolic link to %q at %q", linkContents, dest)
}
if err = os.RemoveAll(dest); err != nil {
return errors.Wrapf(err, "error clearing symbolic link target %q", dest)
}
if err = os.Symlink(linkContents, dest); err != nil {
return errors.Wrapf(err, "error creating symbolic link to %q at %q (second try)", linkContents, dest)
}
}
if err = idtools.SafeLchown(dest, hostOwner.UID, hostOwner.GID); err != nil {
return errors.Wrapf(err, "error setting owner of symbolic link %q to %d:%d", dest, hostOwner.UID, hostOwner.GID)
}
if err = system.LUtimesNano(dest, times); err != nil {
return errors.Wrapf(err, "error setting dates on symbolic link %q", dest)
}
logrus.Debugf("Symlink(%s, %s)", linkContents, dest)
return nil
}