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package buildah
import (
"io"
"net/http"
"net/url"
"os"
"path"
"path/filepath"
"strings"
"syscall"
"time"
"github.com/containers/storage/pkg/archive"
"github.com/opencontainers/runtime-spec/specs-go"
"github.com/pkg/errors"
"github.com/projectatomic/libpod/pkg/chrootuser"
"github.com/sirupsen/logrus"
)
//AddAndCopyOptions holds options for add and copy commands.
type AddAndCopyOptions struct {
Chown string
}
// 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) 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 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 to Last-Modified time %q: %v", last, err3)
}
}()
}
}
defer f.Close()
n, err := io.Copy(f, resp.Body)
if err != nil {
return errors.Wrapf(err, "error reading contents for %q", destination)
}
if resp.ContentLength >= 0 && n != resp.ContentLength {
return errors.Errorf("error reading contents for %q: wrong length (%d != %d)", destination, 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 {
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
}
dest := mountPoint
if destination != "" && filepath.IsAbs(destination) {
dest = filepath.Join(dest, destination)
} else {
if err = ensureDir(filepath.Join(dest, b.WorkDir()), user, 0755); err != nil {
return err
}
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 = ensureDir(dest, user, 0755); err != nil {
return err
}
}
// 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)
}
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); err != nil {
return err
}
if err := setOwner("", d, user); 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 {
srcfi, err := os.Stat(gsrc)
if err != nil {
return errors.Wrapf(err, "error reading %q", gsrc)
}
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 = ensureDir(dest, user, 0755); err != nil {
return err
}
logrus.Debugf("copying %q to %q", gsrc+string(os.PathSeparator)+"*", dest+string(os.PathSeparator)+"*")
if err := copyWithTar(gsrc, dest); err != nil {
return errors.Wrapf(err, "error copying %q to %q", gsrc, dest)
}
if err := setOwner(gsrc, dest, user); err != nil {
return err
}
continue
}
if !extract || !archive.IsArchivePath(gsrc) {
// 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", gsrc, d)
if err := copyFileWithTar(gsrc, d); err != nil {
return errors.Wrapf(err, "error copying %q to %q", gsrc, d)
}
if err := setOwner(gsrc, d, user); err != nil {
return err
}
continue
}
// We're extracting an archive into the destination directory.
logrus.Debugf("extracting contents of %q into %q", gsrc, dest)
if err := untarPath(gsrc, dest); err != nil {
return errors.Wrapf(err, "error extracting %q into %q", gsrc, dest)
}
}
}
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, error) {
if userspec == "" {
userspec = b.User()
}
uid, gid, err := chrootuser.GetUser(mountPoint, userspec)
u := specs.User{
UID: uid,
GID: gid,
Username: userspec,
}
return u, err
}
// setOwner sets the uid and gid owners of a given path.
func setOwner(src, dest string, user specs.User) error {
fid, err := os.Stat(dest)
if err != nil {
return errors.Wrapf(err, "error reading %q", dest)
}
if !fid.IsDir() || src == "" {
if err := os.Lchown(dest, int(user.UID), int(user.GID)); err != nil {
return errors.Wrapf(err, "error setting ownership of %q", dest)
}
return nil
}
err = filepath.Walk(src, func(p string, info os.FileInfo, we error) error {
relPath, err2 := filepath.Rel(src, p)
if err2 != nil {
return errors.Wrapf(err2, "error getting relative path of %q to set ownership on destination", p)
}
if relPath != "." {
absPath := filepath.Join(dest, relPath)
if err2 := os.Lchown(absPath, int(user.UID), int(user.GID)); err != nil {
return errors.Wrapf(err2, "error setting ownership of %q", absPath)
}
}
return nil
})
if err != nil {
return errors.Wrapf(err, "error walking dir %q to set ownership", src)
}
return nil
}
// ensureDir creates a directory if it doesn't exist, setting ownership and permissions as passed by user and perm.
func ensureDir(path string, user specs.User, perm os.FileMode) error {
if _, err := os.Stat(path); os.IsNotExist(err) {
if err := os.MkdirAll(path, perm); err != nil {
return errors.Wrapf(err, "error ensuring directory %q exists", path)
}
if err := os.Chown(path, int(user.UID), int(user.GID)); err != nil {
return errors.Wrapf(err, "error setting ownership of %q", path)
}
}
return nil
}
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