89 lines
2.8 KiB
Go
89 lines
2.8 KiB
Go
package dockerfile // import "github.com/docker/docker/builder/dockerfile"
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import (
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"path/filepath"
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"strconv"
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"strings"
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"github.com/docker/docker/pkg/idtools"
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"github.com/moby/sys/symlink"
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lcUser "github.com/opencontainers/runc/libcontainer/user"
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"github.com/pkg/errors"
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)
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func parseChownFlag(builder *Builder, state *dispatchState, chown, ctrRootPath string, identityMapping *idtools.IdentityMapping) (idtools.Identity, error) {
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var userStr, grpStr string
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parts := strings.Split(chown, ":")
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if len(parts) > 2 {
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return idtools.Identity{}, errors.New("invalid chown string format: " + chown)
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}
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if len(parts) == 1 {
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// if no group specified, use the user spec as group as well
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userStr, grpStr = parts[0], parts[0]
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} else {
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userStr, grpStr = parts[0], parts[1]
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}
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passwdPath, err := symlink.FollowSymlinkInScope(filepath.Join(ctrRootPath, "etc", "passwd"), ctrRootPath)
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if err != nil {
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return idtools.Identity{}, errors.Wrapf(err, "can't resolve /etc/passwd path in container rootfs")
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}
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groupPath, err := symlink.FollowSymlinkInScope(filepath.Join(ctrRootPath, "etc", "group"), ctrRootPath)
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if err != nil {
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return idtools.Identity{}, errors.Wrapf(err, "can't resolve /etc/group path in container rootfs")
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}
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uid, err := lookupUser(userStr, passwdPath)
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if err != nil {
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return idtools.Identity{}, errors.Wrapf(err, "can't find uid for user "+userStr)
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}
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gid, err := lookupGroup(grpStr, groupPath)
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if err != nil {
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return idtools.Identity{}, errors.Wrapf(err, "can't find gid for group "+grpStr)
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}
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// convert as necessary because of user namespaces
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chownPair, err := identityMapping.ToHost(idtools.Identity{UID: uid, GID: gid})
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if err != nil {
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return idtools.Identity{}, errors.Wrapf(err, "unable to convert uid/gid to host mapping")
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}
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return chownPair, nil
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}
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func lookupUser(userStr, filepath string) (int, error) {
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// if the string is actually a uid integer, parse to int and return
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// as we don't need to translate with the help of files
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uid, err := strconv.Atoi(userStr)
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if err == nil {
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return uid, nil
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}
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users, err := lcUser.ParsePasswdFileFilter(filepath, func(u lcUser.User) bool {
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return u.Name == userStr
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})
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if err != nil {
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return 0, err
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}
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if len(users) == 0 {
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return 0, errors.New("no such user: " + userStr)
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}
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return users[0].Uid, nil
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}
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func lookupGroup(groupStr, filepath string) (int, error) {
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// if the string is actually a gid integer, parse to int and return
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// as we don't need to translate with the help of files
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gid, err := strconv.Atoi(groupStr)
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if err == nil {
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return gid, nil
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}
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groups, err := lcUser.ParseGroupFileFilter(filepath, func(g lcUser.Group) bool {
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return g.Name == groupStr
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})
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if err != nil {
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return 0, err
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}
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if len(groups) == 0 {
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return 0, errors.New("no such group: " + groupStr)
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}
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return groups[0].Gid, nil
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}
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